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Date: Sun, 19 Jun 2022 00:25:57 +0000 (UTC)
From: Paolo Prete <p4olo_prete-at-yahoo.it@ffmpeg.org>
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=20

Il sabato 18 giugno 2022, 17:18:18 CEST, Leo Izen <leo.izen@gmail.com> ha s=
critto:

>>On 6/18/22 08:06, Paolo Prete wrote:>> +{>> +=C2=A0 =C2=A0 if (num)>> +=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 av_log(NULL, AV_LOG_ERROR, "%s (error '%s')\n",=
 s, av_err2str(*num));>> +=C2=A0 =C2=A0 else>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 av_log(NULL, AV_LOG_ERROR, "%s\n", s);> +}>This does not need to be a poin=
ter. Convention is that negative values>are errors and nonnegative values a=
re not. So you could always use>something like: if (num < 0).
The pointer makes clearer, when I call the function, that I'm not managing =
a specific error with a number id.
>> -=C2=A0 =C2=A0 AVPacket *tmp_pkt;>> +=C2=A0 =C2=A0 if (type =3D=3D AVMED=
IA_TYPE_AUDIO)>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 enc_time_base =3D ((AVRationa=
l *)out_fmt_ctx->opaque)[0];>> +=C2=A0 =C2=A0 else>> +=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 enc_time_base =3D ((AVRational *)out_fmt_ctx->opaque)[1];>>>Why are =
you referencing the opaque elements of out_fmt_ctx?
I pass, through the opaque element, user data to the muxer. That data (the =
timebases of the audio and video encoders) will be used for rescaling ts to=
 themuxer timebases. Otherwise I would have to pass them through the functi=
on's params, which would make the function prototype longer and less readab=
le.
>>>> -static int write_frame(AVFormatContext *fmt_ctx, AVCodecContext *c,>>=
 -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 AVStream *st, AVFrame *frame, AVPacket *pkt)>> +static int is_extension=
_supported(const char *filename)>Why are you artificially limiting what is =
permitted?
>From what I see, not all extensions are supported without modifying the def=
ault settings. In fact, as specified in the commit msg, some extensions don=
't work and the original muxing.c fails with them.

>> +=C2=A0 =C2=A0 if (!(c =3D avcodec_find_encoder(id))) {>> +=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 avformat_free_context(tmp_fctx);>> +=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 return ret;>You probably don't want to return "ret" here as you don't a=
ssign it.
ret is assigned to 0 (=3D success) at the definition of the variable. And i=
n this case, the function succeeds: the returned AVCodecParameter is set wi=
th AV_CODEC_ID_NONE

>> -=C2=A0 =C2=A0 if (oc->oformat->flags & AVFMT_GLOBALHEADER)>> -=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 c->flags |=3D AV_CODEC_FLAG_GLOBAL_HEADER;>> +=C2=A0 =
=C2=A0 return ret;> Again, why are you returning ret if you are not assigni=
ng to it?
as above, ret is assigned to 0.
>> +=C2=A0 =C2=A0 codec =3D avcodec_find_encoder(params->codec_id);>> +=C2=
=A0 =C2=A0 *enc_ctx =3D avcodec_alloc_context3(codec);>Don't attempt to all=
ocate anything until after you check if the codec is>found.
Is it really necessary?It has been already checked in the line with "if (pr=
ocess_audio/video) {" and the API doxy says that a NULL parameter will only=
 cause that codec-specific defaults won't be initialized (so=C2=A0 it appea=
rs safe to me).
>> +=C2=A0 =C2=A0 if (!codec) {>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("C=
ould not allocate the encoding context", NULL);>This error message does not=
 match the check, which is if the codec is found.>> +=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 return AVERROR_EXIT;>return AVERROR_CODEC_NOT_FOUND;
Instead of changing the error msg, I think that what was wrong is the check=
. I fixed it withif (!(*enc_ctx =3D avcodec_alloc_context3(codec))) {
>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->sample_rate =3D params->sample_=
rate;>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->time_base=C2=A0 =3D (AVRat=
ional){1, params->sample_rate};>Use av_make_q to avoid casting.
Done, thanks.
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;> +=C2=A0 =C2=A0 } else> +=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 return 0;This violates the coding style, you need to u=
se braces {} for the elseblock if you also use it for the if block.
Done, thanks.
> +=C2=A0 =C2=A0 if ((ret =3D av_frame_get_buffer(*frame, 0)) < 0) {> +=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not allocate buffer for AVFrame",=
 &ret);> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR(ENOMEM);> +=C2=A0 =C2=
=A0 } else> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 0;You don't need the else b=
lock here at all.
Done, thanks.
>> +static int init_video_convert(struct SwsContext **ctx, AVCodecParameter=
s *in_params,>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 AVCodecParameters *out_par=
ams)>> +{>This paper-thin wrapper function is unnecessary, just inline it.
This is intentional: even if it's a paper-thin wrapper, it shortens the cod=
e of the main() functionby making it quicker to understand that the audio/v=
ideo converters are initialized with their respective AVCodecParameters. I =
would wait for feedback about this from other readers, before changing the =
code.
> +> +=C2=A0 =C2=A0 if (!tincr) {> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 t=C2=A0 =C2=
=A0 =C2=A0 =3D 0;> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 tincr=C2=A0 =3D 2 * M_PI * =
110.0 / frame->sample_rate;> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* increment freq=
uency by 110 Hz per second */> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 tincr2=C2=A0 =
=3D tincr / frame->sample_rate;What are you doing here? Why are you doing i=
t?>>=C2=A0 =C2=A0 =C2=A0 }>> ->> -=C2=A0 =C2=A0 return write_frame(oc, c, o=
st->st, frame, ost->tmp_pkt);>> +=C2=A0 =C2=A0 for (j =3D 0; j <frame->nb_s=
amples; j++) {>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 v =3D (int)(sin(t) * 10000);>=
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 for (i =3D 0; i < frame->ch_layout.nb_channe=
ls; i++)>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 *data++ =3D v;>> +=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 t=C2=A0 =C2=A0 +=3D tincr;>> +=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 tincr +=3D tincr2;>> +=C2=A0 =C2=A0 }>> +=C2=A0 =C2=A0 frame->pts =
=3D frame->nb_samples*(++frame_ctr);>If you're trying to populate a stream,=
 you should be using the aevalsrc>filter, which exists for exactly this pur=
pose. Otherwise just populate>it with zeroes (silence).>>=C2=A0 }>>>> -/***=
***********************************************************/>> -/* video ou=
tput */>> ->> -static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, in=
t width, int height)>> +static void fill_dummy_yuv420p_frame(AVFrame *frame=
)>>=C2=A0 {>There's a testsrc filter, or just fill a frame with zeroes (bla=
ck).>Don't reinvent the wheel in an example, that discourages people from>u=
sing features that exist.
This is all copied from the original muxing.c example. These dummy audio/vi=
deo frames consist in few lines of code and they are common in doc/example =
files. See also encode-audio.c, encode-video.c. Adding a filtering context =
to the current example would consequently require to patch (and maybe renam=
e) the other files as well. And if you patch in that way, for example, "enc=
ode-audio.c" the reader won't focus on the encoding task, because the filte=
ring block of code would be somewhat distracting.
>> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }>> +=C2=A0 =C2=A0 if (ret < =
0) {>You need to check for AVERROR(EAGAIN).>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
av_log(NULL, AV_LOG_ERROR,>> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 "Error sending frame to the encoder (error '%s')\n", av_err2str(ret));>=
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;
Is it really necessary to check AVERROR(EAGAIN) when sending the frame to t=
he encoder, in this specific case?The function is written in a way that the=
 encoder's output is always read before sending new frames. Note that in th=
e original muxing.c this is not checked as well
>> -=C2=A0 =C2=A0 return write_frame(oc, ost->enc, ost->st, get_video_frame=
(ost), ost->tmp_pkt);>> +=C2=A0 =C2=A0 enum AVMediaType *type =3D (enum AVM=
ediaType *)(fr->opaque);>Why are you reading from the opaque structure of t=
he frame. Are you sure>this is what you wanted to do?
Yes, it just stores an additional info for the frame (it says if the frame =
contains video or audio data), which will be used later in "frame_exceeds_s=
tream_duration()" function.
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "The output forma=
t is automatically guessed according to the file extension.\n">> -=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "Raw images can also be output by=
 using '%%d' in the filename.\n">> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 "BMP or JPEG images can also be output by using '%%d' in the fil=
ename.\n">>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "\n", ar=
gv[0]);>> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 1;>> +=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 return AVERROR_EXIT;>This return value is sent to the operating syst=
em with the exit() system>call so you don't actually want to return an AVER=
ROR value here.
I replaced it with return 1.I also allocated AVCodecParameter with the prop=
er alloc() function, as Andreas suggested.A new patch is attached to this m=
ail.
    Il sabato 18 giugno 2022, 17:18:18 CEST, Leo Izen <leo.izen@gmail.com> =
ha scritto: =20
=20
 On 6/18/22 08:06, Paolo Prete wrote:
> Please review this. It's a code rewrite of doc/examples/muxing.c which im=
proves readability and fixes issues.
> From 8a4e942a001ae49dc052899f331ed43abf954dda Mon Sep 17 00:00:00 2001
> From: paolo <paolopr976@gmail.com>
> Date: Sat, 18 Jun 2022 13:53:55 +0200
> Subject: [PATCH] doc/examples/muxing: code rewrite with improved readabil=
ity
>=C2=A0 and fixed issues
This commit message is too long, you can just truncate "and fixed=20
issues" since it doesn't say much.

>=20
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Improved readabili=
ty with functions that have clearer prototypes and that don't mix logically=
 unrelated blocks of code
>=20
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Fixed issues in ca=
se of unsupported extensions
>=20
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Fixed memory leaks=
 on errors, which are now properly propagated to the main() function
>=20
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Fixed issue on raw=
 images output
>=20
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf() replaced=
 with av_log()
>=20
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Input A/V paramete=
rs exposed in the main() function and easier to customize
> ---
>=C2=A0 doc/examples/muxing.c | 905 +++++++++++++++++++--------------------=
---
>=C2=A0 1 file changed, 406 insertions(+), 499 deletions(-)
>=20
> diff --git a/doc/examples/muxing.c b/doc/examples/muxing.c
> index 3acb778322..04739995d8 100644
> --- a/doc/examples/muxing.c
> +++ b/doc/examples/muxing.c
> @@ -1,5 +1,5 @@
>=C2=A0 /*
> - * Copyright (c) 2003 Fabrice Bellard
> + * Copyright (c) 2022 Paolo Prete (paolopr976 at gmail.com) after Fabric=
e Bellard
Don't remove the original copyright, just add yourself below it. You=20
also don't need to put your email address in the copyright line.
>=C2=A0 *
>=C2=A0 * Permission is hereby granted, free of charge, to any person obtai=
ning a copy
>=C2=A0 * of this software and associated documentation files (the "Softwar=
e"), to deal
> @@ -24,625 +24,532 @@
>=C2=A0 * @file
>=C2=A0 * libavformat API example.
>=C2=A0 *
> - * Output a media file in any supported libavformat format. The default
> + * Output a media file in a set of supported libavformat formats. The de=
fault
>=C2=A0 * codecs are used.
>=C2=A0 * @example muxing.c
>=C2=A0 */
>=C2=A0=20
> -#include <stdlib.h>
> -#include <stdio.h>
> -#include <string.h>
> -#include <math.h>
> -
> -#include <libavutil/avassert.h>
> -#include <libavutil/channel_layout.h>
> -#include <libavutil/opt.h>
> -#include <libavutil/mathematics.h>
> -#include <libavutil/timestamp.h>
>=C2=A0 #include <libavcodec/avcodec.h>
>=C2=A0 #include <libavformat/avformat.h>
> -#include <libswscale/swscale.h>
> +#include <libavutil/timestamp.h>Make sure these stay sorted.
>=C2=A0 #include <libswresample/swresample.h>
> +#include <libswscale/swscale.h>
>=C2=A0=20
> -#define STREAM_DURATION=C2=A0 10.0
> -#define STREAM_FRAME_RATE 25 /* 25 images/s */
> -#define STREAM_PIX_FMT=C2=A0 =C2=A0 AV_PIX_FMT_YUV420P /* default pix_fm=
t */
> -
> -#define SCALE_FLAGS SWS_BICUBIC
> +#define VIDEO_FRAME_RATE 25 /* 25 images/s */
> +#define VIDEO_SCALE_FLAGS SWS_BICUBIC
> +#define STREAM_DURATION 10.0 /* 10 seconds */
>=C2=A0=20
> -// a wrapper around a single output AVStream
> -typedef struct OutputStream {
> -=C2=A0 =C2=A0 AVStream *st;
> -=C2=A0 =C2=A0 AVCodecContext *enc;
> +static void log_error(const char *s, int *num)
> +{
> +=C2=A0 =C2=A0 if (num)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 av_log(NULL, AV_LOG_ERROR, "%s (error '%s')\=
n", s, av_err2str(*num));
> +=C2=A0 =C2=A0 else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 av_log(NULL, AV_LOG_ERROR, "%s\n", s);
> +}
This does not need to be a pointer. Convention is that negative values=20
are errors and nonnegative values are not. So you could always use=20
something like: if (num < 0).

> -=C2=A0 =C2=A0 /* pts of the next frame that will be generated */
> -=C2=A0 =C2=A0 int64_t next_pts;
> -=C2=A0 =C2=A0 int samples_count;
> +static int mux_encoded_pkt(AVPacket *out_pkt, AVFormatContext *out_fmt_c=
tx,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 enum AVMediaType type)
> +{
> +=C2=A0 =C2=A0 int ret;
> +=C2=A0 =C2=A0 AVRational enc_time_base, str_time_base;
>=C2=A0=20
> -=C2=A0 =C2=A0 AVFrame *frame;
> -=C2=A0 =C2=A0 AVFrame *tmp_frame;
> +=C2=A0 =C2=A0 if (out_fmt_ctx->streams[0]->codecpar->codec_type =3D=3D t=
ype)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 out_pkt->stream_index =3D 0;
> +=C2=A0 =C2=A0 else if ((out_fmt_ctx->nb_streams > 1) && (type =3D=3D AVM=
EDIA_TYPE_VIDEO))
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 out_pkt->stream_index =3D 1;
> +=C2=A0 =C2=A0 str_time_base =3D out_fmt_ctx->streams[out_pkt->stream_ind=
ex]->time_base;
>=C2=A0=20
> -=C2=A0 =C2=A0 AVPacket *tmp_pkt;
> +=C2=A0 =C2=A0 if (type =3D=3D AVMEDIA_TYPE_AUDIO)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 enc_time_base =3D ((AVRational *)out_fmt_ctx=
->opaque)[0];
> +=C2=A0 =C2=A0 else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 enc_time_base =3D ((AVRational *)out_fmt_ctx=
->opaque)[1];
>=20
Why are you referencing the opaque elements of out_fmt_ctx?

> -=C2=A0 =C2=A0 float t, tincr, tincr2;
> +=C2=A0 =C2=A0 av_packet_rescale_ts(out_pkt, enc_time_base, str_time_base=
);
>=C2=A0=20
> -=C2=A0 =C2=A0 struct SwsContext *sws_ctx;
> -=C2=A0 =C2=A0 struct SwrContext *swr_ctx;
> -} OutputStream;
> +=C2=A0 =C2=A0 av_log(NULL, AV_LOG_INFO, "stream_index=3D%d, size=3D%d, p=
ts_time=3D%s\n",
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 out_pkt->stream_index,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 out_pkt->size, av_ts2timestr(out_pkt-=
>pts, &str_time_base));
>=C2=A0=20
> -static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *p=
kt)
> -{
> -=C2=A0 =C2=A0 AVRational *time_base =3D &fmt_ctx->streams[pkt->stream_in=
dex]->time_base;
> +=C2=A0 =C2=A0 if ((ret =3D av_interleaved_write_frame(out_fmt_ctx, out_p=
kt)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Error calling av_interleaved_writ=
e_frame()", &ret);
>=C2=A0=20
> -=C2=A0 =C2=A0 printf("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s =
duration_time:%s stream_index:%d\n",
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 av_ts2str(pkt->pts), av_ts2timestr(pk=
t->pts, time_base),
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 av_ts2str(pkt->dts), av_ts2timestr(pk=
t->dts, time_base),
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 av_ts2str(pkt->duration), av_ts2times=
tr(pkt->duration, time_base),
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pkt->stream_index);
> +=C2=A0 =C2=A0 return ret;
>=C2=A0 }
>=C2=A0=20
> -static int write_frame(AVFormatContext *fmt_ctx, AVCodecContext *c,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 AVStream *st, AVFrame *frame, AVPacket *pkt)
> +static int is_extension_supported(const char *filename)
Why are you artificially limiting what is permitted?
>=C2=A0 {
> -=C2=A0 =C2=A0 int ret;
> +=C2=A0 =C2=A0 const char *extensions[] =3D {".aac", ".avi", ".bmp", ".jp=
eg", ".mka",
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ".mkv", ".mov", ".mp4", ".flv",=
=C2=A0 ".ts"};
> +=C2=A0 =C2=A0 int i, size =3D sizeof(extensions) / sizeof(extensions[0])=
;
> +=C2=A0 =C2=A0 char *dot =3D strrchr(filename, '.');
>=C2=A0=20
> -=C2=A0 =C2=A0 // send the frame to the encoder
> -=C2=A0 =C2=A0 ret =3D avcodec_send_frame(c, frame);
> -=C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Error sending a frame to th=
e encoder: %s\n",
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 av_err2str(ret))=
;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 for (i =3D 0; i < size; i++) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (dot && !strcmp(dot, extensions[i]))
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return 1;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 while (ret >=3D 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D avcodec_receive_packet(c, pkt);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (ret =3D=3D AVERROR(EAGAIN) || ret =3D=3D=
 AVERROR_EOF)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 break;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 else if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Error encodin=
g a frame: %s\n", av_err2str(ret));
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 log_error("File extension not supported", NULL);
> +=C2=A0 =C2=A0 av_log(NULL, AV_LOG_WARNING, "Please choose one of the fol=
lowing extensions: ");
> +=C2=A0 =C2=A0 for (i =3D 0; i < size - 1; i++)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 av_log(NULL, AV_LOG_WARNING, "%s, ", extensi=
ons[i]);
> +=C2=A0 =C2=A0 av_log(NULL, AV_LOG_WARNING, "%s\n", extensions[size-1]);
>=C2=A0=20
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* rescale output packet timestamp values fr=
om codec to stream timebase */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 av_packet_rescale_ts(pkt, c->time_base, st->=
time_base);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 pkt->stream_index =3D st->index;
> -
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* Write the compressed frame to the media f=
ile. */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_packet(fmt_ctx, pkt);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D av_interleaved_write_frame(fmt_ctx, =
pkt);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* pkt is now blank (av_interleaved_write_fr=
ame() takes ownership of
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 * its contents and resets pkt), so that no u=
nreferencing is necessary.
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 * This would be different if one used av_wri=
te_frame(). */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Error while w=
riting output packet: %s\n", av_err2str(ret));
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 }
> -
> -=C2=A0 =C2=A0 return ret =3D=3D AVERROR_EOF ? 1 : 0;
> +=C2=A0 =C2=A0 return 0;
>=C2=A0 }
>=C2=A0=20
> -/* Add an output stream. */
> -static void add_stream(OutputStream *ost, AVFormatContext *oc,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 const AVCodec **codec,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 enum AVCodecID codec_id)
> +static int get_default_enc_params(AVCodecParameters *params,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 const char *fname, enum AV=
MediaType type)
>=C2=A0 {
> -=C2=A0 =C2=A0 AVCodecContext *c;
> -=C2=A0 =C2=A0 int i;
> -
> -=C2=A0 =C2=A0 /* find the encoder */
> -=C2=A0 =C2=A0 *codec =3D avcodec_find_encoder(codec_id);
> -=C2=A0 =C2=A0 if (!(*codec)) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not find encoder for =
'%s'\n",
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 avcodec_get_name=
(codec_id));
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 AVFormatContext *tmp_fctx;
> +=C2=A0 =C2=A0 enum AVCodecID id;
> +=C2=A0 =C2=A0 const AVCodec *c;
> +=C2=A0 =C2=A0 int ret =3D 0;
> +
> +=C2=A0 =C2=A0 if ((ret =3D avformat_alloc_output_context2(&tmp_fctx, NUL=
L, NULL, fname)) < 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not get default encoder", &=
ret);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR_EXIT;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 ost->tmp_pkt =3D av_packet_alloc();
> -=C2=A0 =C2=A0 if (!ost->tmp_pkt) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not allocate AVPacket=
\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 id =3D (type =3D=3D AVMEDIA_TYPE_AUDIO) ? tmp_fctx->oforma=
t->audio_codec :
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 tmp_f=
ctx->oformat->video_codec;
>=C2=A0=20
> -=C2=A0 =C2=A0 ost->st =3D avformat_new_stream(oc, NULL);
> -=C2=A0 =C2=A0 if (!ost->st) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not allocate stream\n=
");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 ost->st->id =3D oc->nb_streams-1;
> -=C2=A0 =C2=A0 c =3D avcodec_alloc_context3(*codec);
> -=C2=A0 =C2=A0 if (!c) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not alloc an encoding=
 context\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 if (!(c =3D avcodec_find_encoder(id))) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 avformat_free_context(tmp_fctx);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;
You probably don't want to return "ret" here as you don't assign it.

>=C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 ost->enc =3D c;
> -
> -=C2=A0 =C2=A0 switch ((*codec)->type) {
> -=C2=A0 =C2=A0 case AVMEDIA_TYPE_AUDIO:
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->sample_fmt=C2=A0 =3D (*codec)->sample_fmt=
s ?
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (*codec)->sample_fmts[0] : AV_=
SAMPLE_FMT_FLTP;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->bit_rate=C2=A0 =C2=A0 =3D 64000;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->sample_rate =3D 44100;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((*codec)->supported_samplerates) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c->sample_rate =3D (*codec)->s=
upported_samplerates[0];
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 for (i =3D 0; (*codec)->suppor=
ted_samplerates[i]; i++) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((*codec)->su=
pported_samplerates[i] =3D=3D 44100)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c-=
>sample_rate =3D 44100;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 av_channel_layout_copy(&c->ch_layout, &(AVCh=
annelLayout)AV_CHANNEL_LAYOUT_STEREO);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->st->time_base =3D (AVRational){ 1, c->s=
ample_rate };
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 break;
> -
> -=C2=A0 =C2=A0 case AVMEDIA_TYPE_VIDEO:
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->codec_id =3D codec_id;
> -
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->bit_rate =3D 400000;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* Resolution must be a multiple of two. */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->width=C2=A0 =C2=A0 =3D 352;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->height=C2=A0 =3D 288;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* timebase: This is the fundamental unit of=
 time (in seconds) in terms
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 * of which frame timestamps are represented.=
 For fixed-fps content,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 * timebase should be 1/framerate and timesta=
mp increments should be
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 * identical to 1. */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->st->time_base =3D (AVRational){ 1, STRE=
AM_FRAME_RATE };
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->time_base=C2=A0 =C2=A0 =C2=A0 =3D ost->st=
->time_base;
> -
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->gop_size=C2=A0 =C2=A0 =C2=A0 =3D 12; /* e=
mit one intra frame every twelve frames at most */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->pix_fmt=C2=A0 =C2=A0 =C2=A0 =3D STREAM_PI=
X_FMT;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (c->codec_id =3D=3D AV_CODEC_ID_MPEG2VIDE=
O) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* just for testing, we also a=
dd B-frames */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c->max_b_frames =3D 2;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (c->codec_id =3D=3D AV_CODEC_ID_MPEG1VIDE=
O) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* Needed to avoid using macro=
blocks in which some coeffs overflow.
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 * This does not happen with no=
rmal video, it just happens here as
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 * the motion of the chroma pla=
ne does not match the luma plane. */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c->mb_decision =3D 2;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 break;
>=C2=A0=20
> -=C2=A0 =C2=A0 default:
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 break;
> +=C2=A0 =C2=A0 params->codec_type =3D c->type;
> +=C2=A0 =C2=A0 params->codec_id=C2=A0 =3D c-> id;
> +=C2=A0 =C2=A0 if (c->type =3D=3D AVMEDIA_TYPE_AUDIO) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 params->format=C2=A0 =C2=A0 =C2=A0 =3D c->sa=
mple_fmts ?
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 params->ch_layout=C2=A0 =3D (AVChannelLayout=
)AV_CHANNEL_LAYOUT_STEREO;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 params->sample_rate =3D c->supported_sampler=
ates ?
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c->supported_samplerates[0] : 44100;
> +=C2=A0 =C2=A0 } else if (c->type =3D=3D AVMEDIA_TYPE_VIDEO) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 params->format =3D c->pix_fmts ? c->pix_fmts=
[0] : AV_PIX_FMT_YUV420P;
>=C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 avformat_free_context(tmp_fctx);
>=C2=A0=20
> -=C2=A0 =C2=A0 /* Some formats want stream headers to be separate. */
> -=C2=A0 =C2=A0 if (oc->oformat->flags & AVFMT_GLOBALHEADER)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 c->flags |=3D AV_CODEC_FLAG_GLOBAL_HEADER;
> +=C2=A0 =C2=A0 return ret;
Again, why are you returning ret if you are not assigning to it?

>=C2=A0 }
>=C2=A0=20
> -/**************************************************************/
> -/* audio output */
> -
> -static AVFrame *alloc_audio_frame(enum AVSampleFormat sample_fmt,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 const AVChannelLayout *cha=
nnel_layout,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 int sample_rate, int nb_sa=
mples)
> +static int init_encoder(AVCodecContext **enc_ctx, AVCodecParameters *par=
ams)
>=C2=A0 {
> -=C2=A0 =C2=A0 AVFrame *frame =3D av_frame_alloc();
> +=C2=A0 =C2=A0 const AVCodec *codec =3D NULL;
>=C2=A0 =C2=A0 =C2=A0 int ret;
>=C2=A0=20
> -=C2=A0 =C2=A0 if (!frame) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Error allocating an audio f=
rame\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 codec =3D avcodec_find_encoder(params->codec_id);
> +=C2=A0 =C2=A0 *enc_ctx =3D avcodec_alloc_context3(codec);
Don't attempt to allocate anything until after you check if the codec is=20
found.
> +=C2=A0 =C2=A0 if (!codec) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not allocate the encoding c=
ontext", NULL);
This error message does not match the check, which is if the codec is found=
.
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR_EXIT;
return AVERROR_CODEC_NOT_FOUND;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 frame->format =3D sample_fmt;
> -=C2=A0 =C2=A0 av_channel_layout_copy(&frame->ch_layout, channel_layout);
> -=C2=A0 =C2=A0 frame->sample_rate =3D sample_rate;
> -=C2=A0 =C2=A0 frame->nb_samples =3D nb_samples;
> -
> -=C2=A0 =C2=A0 if (nb_samples) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D av_frame_get_buffer(frame, 0);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Error allocat=
ing an audio buffer\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 (*enc_ctx)->codec_id=C2=A0 =3D params->codec_id;
> +=C2=A0 =C2=A0 (*enc_ctx)->codec_type =3D params->codec_type;
> +=C2=A0 =C2=A0 if (params->codec_type =3D=3D AVMEDIA_TYPE_AUDIO) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->sample_fmt=C2=A0 =3D params->for=
mat;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->sample_rate =3D params->sample_r=
ate;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->time_base=C2=A0 =3D (AVRational)=
{1, params->sample_rate};
Use av_make_q to avoid casting.
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->ch_layout=C2=A0 =3D params->ch_l=
ayout;
> +=C2=A0 =C2=A0 } else if (params->codec_type =3D=3D AVMEDIA_TYPE_VIDEO) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->width=C2=A0 =C2=A0 =C2=A0 =3D pa=
rams->width;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->height=C2=A0 =C2=A0 =3D params->=
height;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->time_base=C2=A0 =3D (AVRational)=
{ 1, VIDEO_FRAME_RATE };Better off just definine VIDEO_FRAME_RATE_Q to be a=
n AVRational with=20
value {1, 25};
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->gop_size=C2=A0 =3D 12;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*enc_ctx)->pix_fmt=C2=A0 =C2=A0 =3D params-=
>format;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 return frame;
> +=C2=A0 =C2=A0 if ((ret =3D avcodec_open2(*enc_ctx, codec, NULL)) < 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not open input codec", &ret=
);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;
> +=C2=A0 =C2=A0 } else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 0;This violates the coding style, you=
 need to use braces {} for the else=20
block if you also use it for the if block.
>=C2=A0 }
>=C2=A0=20
> -static void open_audio(AVFormatContext *oc, const AVCodec *codec,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 OutputStream *ost, AVDictionary *opt_arg)
> +static int init_avframe(AVFrame **frame, AVCodecParameters *params)
>=C2=A0 {
> -=C2=A0 =C2=A0 AVCodecContext *c;
> -=C2=A0 =C2=A0 int nb_samples;
>=C2=A0 =C2=A0 =C2=A0 int ret;
> -=C2=A0 =C2=A0 AVDictionary *opt =3D NULL;
>=C2=A0=20
> -=C2=A0 =C2=A0 c =3D ost->enc;
> +=C2=A0 =C2=A0 if (!(*frame =3D av_frame_alloc())) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not allocate AVFrame", NULL=
);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR(ENOMEM);
> +=C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 /* open it */
> -=C2=A0 =C2=A0 av_dict_copy(&opt, opt_arg, 0);
> -=C2=A0 =C2=A0 ret =3D avcodec_open2(c, codec, &opt);
> -=C2=A0 =C2=A0 av_dict_free(&opt);
> -=C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not open audio codec:=
 %s\n", av_err2str(ret));
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 (*frame)->opaque =3D &params->codec_type;
> +=C2=A0 =C2=A0 if (params->codec_type =3D=3D AVMEDIA_TYPE_AUDIO) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*frame)->nb_samples=C2=A0 =3D params->frame=
_size;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*frame)->sample_rate =3D params->sample_rat=
e;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*frame)->format=C2=A0 =C2=A0 =C2=A0 =3D par=
ams->format;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*frame)->ch_layout=C2=A0 =3D params->ch_lay=
out;
> +=C2=A0 =C2=A0 } else {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*frame)->width=C2=A0 =3D params->width;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*frame)->height =3D params->height;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 (*frame)->format =3D params->format;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 /* init signal generator */
> -=C2=A0 =C2=A0 ost->t=C2=A0 =C2=A0 =3D 0;
> -=C2=A0 =C2=A0 ost->tincr =3D 2 * M_PI * 110.0 / c->sample_rate;
> -=C2=A0 =C2=A0 /* increment frequency by 110 Hz per second */
> -=C2=A0 =C2=A0 ost->tincr2 =3D 2 * M_PI * 110.0 / c->sample_rate / c->sam=
ple_rate;
> +=C2=A0 =C2=A0 /* Allocate the frame's data buffer */
> +=C2=A0 =C2=A0 if ((ret =3D av_frame_get_buffer(*frame, 0)) < 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not allocate buffer for AVF=
rame", &ret);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR(ENOMEM);
> +=C2=A0 =C2=A0 } else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 0;
You don't need the else block here at all.
> +}
>=C2=A0=20
> -=C2=A0 =C2=A0 if (c->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_S=
IZE)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 nb_samples =3D 10000;
> -=C2=A0 =C2=A0 else
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 nb_samples =3D c->frame_size;
> +static int init_audio_convert(struct SwrContext **ctx, AVCodecParameters=
 *in_params,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 AVCodecParameters *out_params)
> +{
> +=C2=A0 =C2=A0 swr_alloc_set_opts2(ctx,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 &(out_params->ch_layout),
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 out_params->format, out_params->sample_rate,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 &(in_params->ch_layout),
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 in_params->format, in_params->sample_rate,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 0, NULL);
> +=C2=A0 =C2=A0 if (!*ctx) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not allocate resample conte=
xt", NULL);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR(ENOMEM);
> +=C2=A0 =C2=A0 } else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 0;
> +}
You don't need the else block here at all.
>=C2=A0=20
> -=C2=A0 =C2=A0 ost->frame=C2=A0 =C2=A0 =3D alloc_audio_frame(c->sample_fm=
t, &c->ch_layout,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c->sample_ra=
te, nb_samples);
> -=C2=A0 =C2=A0 ost->tmp_frame =3D alloc_audio_frame(AV_SAMPLE_FMT_S16, &c=
->ch_layout,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c->sample_ra=
te, nb_samples);
> +static int init_video_convert(struct SwsContext **ctx, AVCodecParameters=
 *in_params,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 AVCodecParameters *out_params)
> +{
This paper-thin wrapper function is unnecessary, just inline it.
> +=C2=A0 =C2=A0 *ctx =3D sws_getContext(in_params->width, in_params->heigh=
t,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 in_params->format,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 out_params->width, out_params->height,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 out_params->codec_id =3D=3D out_params->format,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 VIDEO_SCALE_FLAGS, NULL, NULL, NULL);
> +=C2=A0 =C2=A0 if (!*ctx) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not allocate scale context"=
, NULL);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR(ENOMEM);
> +=C2=A0 =C2=A0 } else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 0;
> +}
>=C2=A0=20
> -=C2=A0 =C2=A0 /* copy the stream parameters to the muxer */
> -=C2=A0 =C2=A0 ret =3D avcodec_parameters_from_context(ost->st->codecpar,=
 c);
> -=C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not copy the stream p=
arameters\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 }
> +static int init_muxer(AVFormatContext **out_fmt_ctx, AVCodecContext *aud=
io_enc_ctx,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 AVCodecContext *video_enc_ctx, const char *filename)
> +{
> +=C2=A0 =C2=A0 int ret;
> +=C2=A0 =C2=A0 AVStream *out_audio_str, *out_video_str;
>=C2=A0=20
> -=C2=A0 =C2=A0 /* create resampler context */
> -=C2=A0 =C2=A0 ost->swr_ctx =3D swr_alloc();
> -=C2=A0 =C2=A0 if (!ost->swr_ctx) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not allocate resample=
r context\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 if ((ret =3D avformat_alloc_output_context2(out_fmt_ctx, N=
ULL, NULL, filename)) < 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not create output context",=
 &ret);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 /* set options */
> -=C2=A0 =C2=A0 av_opt_set_chlayout=C2=A0 (ost->swr_ctx, "in_chlayout",=C2=
=A0 =C2=A0 =C2=A0 &c->ch_layout,=C2=A0 =C2=A0 =C2=A0 0);
> -=C2=A0 =C2=A0 av_opt_set_int=C2=A0 =C2=A0 =C2=A0 (ost->swr_ctx, "in_samp=
le_rate",=C2=A0 =C2=A0 c->sample_rate,=C2=A0 =C2=A0 0);
> -=C2=A0 =C2=A0 av_opt_set_sample_fmt(ost->swr_ctx, "in_sample_fmt",=C2=A0=
 =C2=A0 =C2=A0 AV_SAMPLE_FMT_S16, 0);
> -=C2=A0 =C2=A0 av_opt_set_chlayout=C2=A0 (ost->swr_ctx, "out_chlayout",=
=C2=A0 =C2=A0 =C2=A0 &c->ch_layout,=C2=A0 =C2=A0 =C2=A0 0);
> -=C2=A0 =C2=A0 av_opt_set_int=C2=A0 =C2=A0 =C2=A0 (ost->swr_ctx, "out_sam=
ple_rate",=C2=A0 =C2=A0 c->sample_rate,=C2=A0 =C2=A0 0);
> -=C2=A0 =C2=A0 av_opt_set_sample_fmt(ost->swr_ctx, "out_sample_fmt",=C2=
=A0 =C2=A0 c->sample_fmt,=C2=A0 =C2=A0 0);
> -
> -=C2=A0 =C2=A0 /* initialize the resampling context */
> -=C2=A0 =C2=A0 if ((ret =3D swr_init(ost->swr_ctx)) < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Failed to initialize the re=
sampling context\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 /* open the output file, if needed */
> +=C2=A0 =C2=A0 if (!((*out_fmt_ctx)->oformat->flags & AVFMT_NOFILE)) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D avio_open(&(*out_fmt_ctx)->pb, =
filename, AVIO_FLAG_WRITE)) < 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not open outp=
ut file", &ret);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
>=C2=A0 =C2=A0 =C2=A0 }
> -}
>=C2=A0=20
> -/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
> - * 'nb_channels' channels. */
> -static AVFrame *get_audio_frame(OutputStream *ost)
> -{
> -=C2=A0 =C2=A0 AVFrame *frame =3D ost->tmp_frame;
> -=C2=A0 =C2=A0 int j, i, v;
> -=C2=A0 =C2=A0 int16_t *q =3D (int16_t*)frame->data[0];
> -
> -=C2=A0 =C2=A0 /* check if we want to generate more frames */
> -=C2=A0 =C2=A0 if (av_compare_ts(ost->next_pts, ost->enc->time_base,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 STREAM_DURATION, (AVRational){ 1, 1 }) > 0)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 return NULL;
> +=C2=A0 =C2=A0 if (audio_enc_ctx) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!(out_audio_str =3D avformat_new_stream(=
*out_fmt_ctx, NULL))) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not create ne=
w stream", NULL);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR(ENOMEM);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 out_audio_str->id =3D (*out_fmt_ctx)->nb_str=
eams - 1;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 avcodec_parameters_from_context(out_audio_st=
r->codecpar, audio_enc_ctx);
> +=C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 for (j =3D 0; j <frame->nb_samples; j++) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 v =3D (int)(sin(ost->t) * 10000);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 for (i =3D 0; i < ost->enc->ch_layout.nb_cha=
nnels; i++)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 *q++ =3D v;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->t=C2=A0 =C2=A0 +=3D ost->tincr;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->tincr +=3D ost->tincr2;
> +=C2=A0 =C2=A0 if (video_enc_ctx) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!(out_video_str =3D avformat_new_stream(=
*out_fmt_ctx, NULL))) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not create ne=
w stream", NULL);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR(ENOMEM);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 out_video_str->id =3D (*out_fmt_ctx)->nb_str=
eams - 1;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 avcodec_parameters_from_context(out_video_st=
r->codecpar, video_enc_ctx);
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 frame->pts =3D ost->next_pts;
> -=C2=A0 =C2=A0 ost->next_pts=C2=A0 +=3D frame->nb_samples;
> +=C2=A0 =C2=A0 av_dump_format(*out_fmt_ctx, 0, filename, 1);
>=C2=A0=20
> -=C2=A0 =C2=A0 return frame;
> +=C2=A0 =C2=A0 /* Write the stream header, if any. */
> +=C2=A0 =C2=A0 if (avformat_write_header(*out_fmt_ctx, NULL) < 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("avformat_write_header() error", N=
ULL);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR_EXIT;
> +=C2=A0 =C2=A0 } else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 0;This else block is unnecessary.
>=C2=A0 }
>=C2=A0=20
> -/*
> - * encode one audio frame and send it to the muxer
> - * return 1 when encoding is finished, 0 otherwise
> - */
> -static int write_audio_frame(AVFormatContext *oc, OutputStream *ost)
> +static void fill_dummy_s16_frame(AVFrame *frame)
>=C2=A0 {
> -=C2=A0 =C2=A0 AVCodecContext *c;
> -=C2=A0 =C2=A0 AVFrame *frame;
> -=C2=A0 =C2=A0 int ret;
> -=C2=A0 =C2=A0 int dst_nb_samples;
> -
> -=C2=A0 =C2=A0 c =3D ost->enc;
> -
> -=C2=A0 =C2=A0 frame =3D get_audio_frame(ost);
> -
> -=C2=A0 =C2=A0 if (frame) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* convert samples from native format to des=
tination codec format, using the resampler */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* compute destination number of samples */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 dst_nb_samples =3D av_rescale_rnd(swr_get_de=
lay(ost->swr_ctx, c->sample_rate) + frame->nb_samples,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 c->sa=
mple_rate, c->sample_rate, AV_ROUND_UP);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 av_assert0(dst_nb_samples =3D=3D frame->nb_s=
amples);
> -
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* when we pass a frame to the encoder, it m=
ay keep a reference to it
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 * internally;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 * make sure we do not overwrite it here
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D av_frame_make_writable(ost->frame);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (ret < 0)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* convert to destination format */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D swr_convert(ost->swr_ctx,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 ost->frame->data, dst_nb_samples,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 (const uint8_t **)frame->data, frame->nb_samples);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Error while c=
onverting\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 frame =3D ost->frame;
> -
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 frame->pts =3D av_rescale_q(ost->samples_cou=
nt, (AVRational){1, c->sample_rate}, c->time_base);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->samples_count +=3D dst_nb_samples;
> +=C2=A0 =C2=A0 int j, i, v;
> +=C2=A0 =C2=A0 static float t, tincr, tincr2;
> +=C2=A0 =C2=A0 int16_t *data =3D (int16_t*)frame->data[0];
> +=C2=A0 =C2=A0 static int frame_ctr;
> +
> +=C2=A0 =C2=A0 if (!tincr) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 t=C2=A0 =C2=A0 =C2=A0 =3D 0;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 tincr=C2=A0 =3D 2 * M_PI * 110.0 / frame->sa=
mple_rate;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* increment frequency by 110 Hz per second =
*/
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 tincr2=C2=A0 =3D tincr / frame->sample_rate;
What are you doing here? Why are you doing it?

>=C2=A0 =C2=A0 =C2=A0 }
> -
> -=C2=A0 =C2=A0 return write_frame(oc, c, ost->st, frame, ost->tmp_pkt);
> +=C2=A0 =C2=A0 for (j =3D 0; j <frame->nb_samples; j++) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 v =3D (int)(sin(t) * 10000);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 for (i =3D 0; i < frame->ch_layout.nb_channe=
ls; i++)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 *data++ =3D v;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 t=C2=A0 =C2=A0 +=3D tincr;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 tincr +=3D tincr2;
> +=C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 frame->pts =3D frame->nb_samples*(++frame_ctr);
If you're trying to populate a stream, you should be using the aevalsrc=20
filter, which exists for exactly this purpose. Otherwise just populate=20
it with zeroes (silence).
>=C2=A0 }
>=C2=A0=20
> -/**************************************************************/
> -/* video output */
> -
> -static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int=
 height)
> +static void fill_dummy_yuv420p_frame(AVFrame *frame)
>=C2=A0 {
There's a testsrc filter, or just fill a frame with zeroes (black).=20
Don't reinvent the wheel in an example, that discourages people from=20
using features that exist.

> -=C2=A0 =C2=A0 AVFrame *picture;
> -=C2=A0 =C2=A0 int ret;
> -
> -=C2=A0 =C2=A0 picture =3D av_frame_alloc();
> -=C2=A0 =C2=A0 if (!picture)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 return NULL;
> +=C2=A0 =C2=A0 int x, y;
> +=C2=A0 =C2=A0 static int idx;
>=C2=A0=20
> -=C2=A0 =C2=A0 picture->format =3D pix_fmt;
> -=C2=A0 =C2=A0 picture->width=C2=A0 =3D width;
> -=C2=A0 =C2=A0 picture->height =3D height;
> +=C2=A0 =C2=A0 /* Y */
> +=C2=A0 =C2=A0 for (y =3D 0; y < frame->width; y++)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 for (x =3D 0; x < frame->width; x++)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 frame->data[0][y * frame->line=
size[0] + x] =3D x + y + idx * 3;
>=C2=A0=20
> -=C2=A0 =C2=A0 /* allocate the buffers for the frame data */
> -=C2=A0 =C2=A0 ret =3D av_frame_get_buffer(picture, 0);
> -=C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not allocate frame da=
ta.\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 /* Cb and Cr */
> +=C2=A0 =C2=A0 for (y =3D 0; y < frame->height / 2; y++) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 for (x =3D 0; x < frame->width / 2; x++) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 frame->data[1][y * frame->line=
size[1] + x] =3D 128 + y + idx * 2;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 frame->data[2][y * frame->line=
size[2] + x] =3D 64 + x + idx * 5;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
>=C2=A0 =C2=A0 =C2=A0 }
> The
> -=C2=A0 =C2=A0 return picture;
> +=C2=A0 =C2=A0 frame->pts =3D idx++;
>=C2=A0 }
>=C2=A0=20
> -static void open_video(AVFormatContext *oc, const AVCodec *codec,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 OutputStream *ost, AVDictionary *opt_arg)
> +static int convert_frame(void *convert_ctx, AVFrame *in_frame, AVFrame *=
out_frame)
>=C2=A0 {
>=C2=A0 =C2=A0 =C2=A0 int ret;
> -=C2=A0 =C2=A0 AVCodecContext *c =3D ost->enc;
> -=C2=A0 =C2=A0 AVDictionary *opt =3D NULL;
> -
> -=C2=A0 =C2=A0 av_dict_copy(&opt, opt_arg, 0);
> +=C2=A0 =C2=A0 enum AVMediaType *type =3D (enum AVMediaType *)(in_frame->=
opaque);
>=C2=A0=20
> -=C2=A0 =C2=A0 /* open the codec */
> -=C2=A0 =C2=A0 ret =3D avcodec_open2(c, codec, &opt);
> -=C2=A0 =C2=A0 av_dict_free(&opt);
> -=C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not open video codec:=
 %s\n", av_err2str(ret));
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 }
> -
> -=C2=A0 =C2=A0 /* allocate and init a re-usable frame */
> -=C2=A0 =C2=A0 ost->frame =3D alloc_picture(c->pix_fmt, c->width, c->heig=
ht);
> -=C2=A0 =C2=A0 if (!ost->frame) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not allocate video fr=
ame\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 if (av_frame_make_writable(out_frame) < 0) {
=C2=A0 if ((ret =3D av_frame_make_writable(out_frame)) < 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("av_frame_make_writable() error", =
NULL);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR_EXIT;return ret;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 /* If the output format is not YUV420P, then a temporary Y=
UV420P
> -=C2=A0 =C2=A0 * picture is needed too. It is then converted to the requi=
red
> -=C2=A0 =C2=A0 * output format. */
> -=C2=A0 =C2=A0 ost->tmp_frame =3D NULL;
> -=C2=A0 =C2=A0 if (c->pix_fmt !=3D AV_PIX_FMT_YUV420P) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->tmp_frame =3D alloc_picture(AV_PIX_FMT_=
YUV420P, c->width, c->height);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!ost->tmp_frame) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not all=
ocate temporary picture\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> +=C2=A0 =C2=A0 if (*type =3D=3D AVMEDIA_TYPE_AUDIO) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D swr_convert_frame((struct SwrCo=
ntext *)convert_ctx, out_frame,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (const AVFrame *)in=
_frame)) !=3D 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Error converting AV=
Frame", &ret);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 } else {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 sws_scale((struct SwsContext *)convert_ctx, =
(const uint8_t * const *)in_frame->data,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 in_frame-=
>linesize, 0, in_frame->height, out_frame->data,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 out_frame=
->linesize);
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 /* copy the stream parameters to the muxer */
> -=C2=A0 =C2=A0 ret =3D avcodec_parameters_from_context(ost->st->codecpar,=
 c);
> -=C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not copy the stream p=
arameters\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 out_frame->pts =3D in_frame->pts;
> +=C2=A0 =C2=A0 return 0;
>=C2=A0 }
>=C2=A0=20
> -/* Prepare a dummy image. */
> -static void fill_yuv_image(AVFrame *pict, int frame_index,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 int width, int height)
> +static int encode_frame(AVCodecContext *ctx, AVFrame *in_frame, AVPacket=
 *out_pkt)
>=C2=A0 {
> -=C2=A0 =C2=A0 int x, y, i;
> +=C2=A0 =C2=A0 static int is_flushing_audio =3D 0, is_flushing_video =3D =
0;
> +=C2=A0 =C2=A0 int ret =3D 0;
> +=C2=A0 =C2=A0 int is_audio =3D ctx->codec->type =3D=3D AVMEDIA_TYPE_AUDI=
O;
>=C2=A0=20
> -=C2=A0 =C2=A0 i =3D frame_index;
> -
> -=C2=A0 =C2=A0 /* Y */
> -=C2=A0 =C2=A0 for (y =3D 0; y < height; y++)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 for (x =3D 0; x < width; x++)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pict->data[0][y * pict->linesi=
ze[0] + x] =3D x + y + i * 3;
> -
> -=C2=A0 =C2=A0 /* Cb and Cr */
> -=C2=A0 =C2=A0 for (y =3D 0; y < height / 2; y++) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 for (x =3D 0; x < width / 2; x++) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pict->data[1][y * pict->linesi=
ze[1] + x] =3D 128 + y + i * 2;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pict->data[2][y * pict->linesi=
ze[2] + x] =3D 64 + x + i * 5;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 if ((is_audio && !is_flushing_audio) || (!is_audio && !is_=
flushing_video)) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D avcodec_send_frame(ctx, in_frame);
>=C2=A0 =C2=A0 =C2=A0 }
> -}
> -
> -static AVFrame *get_video_frame(OutputStream *ost)
> -{
> -=C2=A0 =C2=A0 AVCodecContext *c =3D ost->enc;
> -
> -=C2=A0 =C2=A0 /* check if we want to generate more frames */
> -=C2=A0 =C2=A0 if (av_compare_ts(ost->next_pts, c->time_base,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 STREAM_DURATION, (AVRational){ 1, 1 }) > 0)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 return NULL;
> -
> -=C2=A0 =C2=A0 /* when we pass a frame to the encoder, it may keep a refe=
rence to it
> -=C2=A0 =C2=A0 * internally; make sure we do not overwrite it here */
> -=C2=A0 =C2=A0 if (av_frame_make_writable(ost->frame) < 0)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -
> -=C2=A0 =C2=A0 if (c->pix_fmt !=3D AV_PIX_FMT_YUV420P) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* as we only generate a YUV420P picture, we=
 must convert it
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 * to the codec pixel format if needed */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!ost->sws_ctx) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->sws_ctx =3D sws_getContex=
t(c->width, c->height,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 AV_PIX_FMT_YUV420P,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 c->width, c->height,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 c->pix_fmt,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 SCALE_FLAGS, NULL, NULL, NULL);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!ost->sws_ctx) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 "Could not initialize the conversion context\n");
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit(1);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 if (ret < 0) {
You need to check for AVERROR(EAGAIN).
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 av_log(NULL, AV_LOG_ERROR,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "Error sending frame to=
 the encoder (error '%s')\n", av_err2str(ret));
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;
> +=C2=A0 =C2=A0 } else if (ret =3D=3D 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D avcodec_receive_packet(ctx, out_pkt)=
;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret < 0) && (ret !=3D AVERROR(EAGAIN)) =
&& (ret !=3D AVERROR_EOF)) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 av_log(NULL, AV_LOG_ERROR,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "Error re=
ceiving encoded packet (error '%s')\n", av_err2str(ret));
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return ret;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fill_yuv_image(ost->tmp_frame, ost->next_pts=
, c->width, c->height);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 sws_scale(ost->sws_ctx, (const uint8_t * con=
st *) ost->tmp_frame->data,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->tmp_=
frame->linesize, 0, c->height, ost->frame->data,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ost->fram=
e->linesize);
> -=C2=A0 =C2=A0 } else {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fill_yuv_image(ost->frame, ost->next_pts, c-=
>width, c->height);
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 ost->frame->pts =3D ost->next_pts++;
> +=C2=A0 =C2=A0 if (is_audio)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 is_flushing_audio =3D (in_frame =3D=3D NULL)=
;
> +=C2=A0 =C2=A0 else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 is_flushing_video =3D (in_frame =3D=3D NULL)=
;
>=C2=A0=20
> -=C2=A0 =C2=A0 return ost->frame;
> +=C2=A0 =C2=A0 return ret;
>=C2=A0 }
>=C2=A0=20
> -/*
> - * encode one video frame and send it to the muxer
> - * return 1 when encoding is finished, 0 otherwise
> - */
> -static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
> +static int frame_exceeds_stream_duration(AVFrame *fr)
>=C2=A0 {
> -=C2=A0 =C2=A0 return write_frame(oc, ost->enc, ost->st, get_video_frame(=
ost), ost->tmp_pkt);
> +=C2=A0 =C2=A0 enum AVMediaType *type =3D (enum AVMediaType *)(fr->opaque=
);
Why are you reading from the opaque structure of the frame. Are you sure=20
this is what you wanted to do?
> +=C2=A0 =C2=A0 AVRational tb =3D (*type =3D=3D AVMEDIA_TYPE_AUDIO) ? (AVR=
ational){ 1, fr->sample_rate} :
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (AVRational){ 1, VIDEO_FRAME_RATE};
> +
> +=C2=A0 =C2=A0 return av_compare_ts(fr->pts, tb ,STREAM_DURATION, (AVRati=
onal){ 1, 1 }) > 0;
>=C2=A0 }
>=C2=A0=20
> -static void close_stream(AVFormatContext *oc, OutputStream *ost)
> +static enum AVMediaType media_type_of_earlier_frame(AVFrame *audio_fr,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 AVFrame *video_fr)
>=C2=A0 {
> -=C2=A0 =C2=A0 avcodec_free_context(&ost->enc);
> -=C2=A0 =C2=A0 av_frame_free(&ost->frame);
> -=C2=A0 =C2=A0 av_frame_free(&ost->tmp_frame);
> -=C2=A0 =C2=A0 av_packet_free(&ost->tmp_pkt);
> -=C2=A0 =C2=A0 sws_freeContext(ost->sws_ctx);
> -=C2=A0 =C2=A0 swr_free(&ost->swr_ctx);
> +=C2=A0 =C2=A0 if (!audio_fr)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVMEDIA_TYPE_VIDEO;
> +=C2=A0 =C2=A0 if (!video_fr)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVMEDIA_TYPE_AUDIO;
> +
> +=C2=A0 =C2=A0 if (av_compare_ts(audio_fr->pts, (AVRational){ 1, audio_fr=
->sample_rate},
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 video_fr->pts, (AVRational){ 1, VIDEO_FRAME_RATE}) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVMEDIA_TYPE_AUDIO;
> +=C2=A0 =C2=A0 else
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVMEDIA_TYPE_VIDEO;
>=C2=A0 }
>=C2=A0=20
> -/**************************************************************/
> -/* media file output */
> -
>=C2=A0 int main(int argc, char **argv)
>=C2=A0 {
> -=C2=A0 =C2=A0 OutputStream video_st =3D { 0 }, audio_st =3D { 0 };
> -=C2=A0 =C2=A0 const AVOutputFormat *fmt;
> -=C2=A0 =C2=A0 const char *filename;
> -=C2=A0 =C2=A0 AVFormatContext *oc;
> -=C2=A0 =C2=A0 const AVCodec *audio_codec, *video_codec;
> -=C2=A0 =C2=A0 int ret;
> -=C2=A0 =C2=A0 int have_video =3D 0, have_audio =3D 0;
> -=C2=A0 =C2=A0 int encode_video =3D 0, encode_audio =3D 0;
> -=C2=A0 =C2=A0 AVDictionary *opt =3D NULL;
> -=C2=A0 =C2=A0 int i;
> -
> -=C2=A0 =C2=A0 if (argc < 2) {
> +=C2=A0 =C2=A0 const char *fname;
> +=C2=A0 =C2=A0 AVCodecContext *audio_enc_ctx =3D NULL, *video_enc_ctx =3D=
 NULL, *enc_ctx =3D NULL;
> +
> +=C2=A0 =C2=A0 /* NOTE: if you want to modify the audio/video input ".for=
mat" parameter,
> +=C2=A0 =C2=A0 * you need to modify the corresponding fill_dummy_XXX_fram=
e() function(s) too */
> +=C2=A0 =C2=A0 AVCodecParameters audio_in_params =3D {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 .codec_type=C2=A0 =3D AVMEDIA_TYPE_AUDIO,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 .format=C2=A0 =C2=A0 =C2=A0 =3D AV_SAMPLE_FM=
T_S16,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 .sample_rate =3D 44100,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 .ch_layout=C2=A0 =3D (AVChannelLayout)AV_CHA=
NNEL_LAYOUT_STEREO
> +=C2=A0 =C2=A0 },
> +=C2=A0 =C2=A0 video_in_params =3D {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 .codec_type =3D AVMEDIA_TYPE_VIDEO,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 .width=C2=A0 =C2=A0 =C2=A0 =3D 352,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 .height=C2=A0 =C2=A0 =3D 288,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 .format=C2=A0 =C2=A0 =3D AV_PIX_FMT_YUV420P
> +=C2=A0 =C2=A0 },
> +=C2=A0 =C2=A0 video_enc_params=C2=A0 =3D { 0 }, audio_enc_params =3D { 0=
 }; > +=C2=A0 =C2=A0 struct AVRational enc_timebases[2];
> +=C2=A0 =C2=A0 AVFrame *in_audio_frame =3D NULL, *converted_audio_frame =
=3D NULL,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 *in_video_frame =3D NULL, *con=
verted_video_frame =3D NULL,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 *frame_to_encode =3D NULL;
> +=C2=A0 =C2=A0 struct SwrContext *audio_convert_ctx =3D NULL;
> +=C2=A0 =C2=A0 struct SwsContext *video_convert_ctx =3D NULL;
> +=C2=A0 =C2=A0 enum AVMediaType media_type;
> +=C2=A0 =C2=A0 AVFormatContext *out_fmt_ctx =3D NULL;
> +=C2=A0 =C2=A0 AVPacket *out_pkt =3D av_packet_alloc();
> +=C2=A0 =C2=A0 int ret =3D 0, process_audio =3D 0, process_video =3D 0;
> +
> +=C2=A0 =C2=A0 if (argc !=3D 2) {
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 printf("usage: %s output_file\n"
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "API example progr=
am to output a media file with libavformat.\n"
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "This program generates=
 a synthetic audio and video stream, encodes and\n"
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "This program generates=
 a synthetic audio and/or video stream, encodes and\n"
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "muxes them into a=
 file named output_file.\n"
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "The output format=
 is automatically guessed according to the file extension.\n"
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "Raw images can also be=
 output by using '%%d' in the filename.\n"
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "BMP or JPEG images can=
 also be output by using '%%d' in the filename.\n"
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 "\n", argv[0]);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 1;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 return AVERROR_EXIT;
This return value is sent to the operating system with the exit() system=20
call so you don't actually want to return an AVERROR value here.

>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 filename =3D argv[1];
> -=C2=A0 =C2=A0 for (i =3D 2; i+1 < argc; i+=3D2) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!strcmp(argv[i], "-flags") || !strcmp(ar=
gv[i], "-fflags"))
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 av_dict_set(&opt, argv[i]+1, a=
rgv[i+1], 0);
> +=C2=A0 =C2=A0 fname =3D argv[1];
> +=C2=A0 =C2=A0 if (!is_extension_supported(fname)) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D AVERROR_EXIT;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 /* allocate the output media context */
> -=C2=A0 =C2=A0 avformat_alloc_output_context2(&oc, NULL, NULL, filename);
> -=C2=A0 =C2=A0 if (!oc) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 printf("Could not deduce output format from =
file extension: using MPEG.\n"); > -=C2=A0 =C2=A0 =C2=A0 =C2=A0 avformat_al=
loc_output_context2(&oc, NULL, "mpeg", filename);
> -=C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 if (!oc)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 1;
> -
> -=C2=A0 =C2=A0 fmt =3D oc->oformat;
> -
> -=C2=A0 =C2=A0 /* Add the audio and video streams using the default forma=
t codecs
> -=C2=A0 =C2=A0 * and initialize the codecs. */
> -=C2=A0 =C2=A0 if (fmt->video_codec !=3D AV_CODEC_ID_NONE) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 add_stream(&video_st, oc, &video_codec, fmt-=
>video_codec);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 have_video =3D 1;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 encode_video =3D 1;
> +=C2=A0 =C2=A0 /* Desume the default codecs and their default parameters =
from the filename */
> +=C2=A0 =C2=A0 if ((ret =3D get_default_enc_params(&audio_enc_params, fna=
me, AVMEDIA_TYPE_AUDIO)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 if ((ret =3D get_default_enc_params(&video_enc_params, fna=
me, AVMEDIA_TYPE_VIDEO)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 process_audio =3D audio_enc_params.codec_id !=3D AV_CODEC_=
ID_NONE;
> +=C2=A0 =C2=A0 process_video =3D video_enc_params.codec_id !=3D AV_CODEC_=
ID_NONE;
> +=C2=A0 =C2=A0 if (!process_audio && !process_video) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 log_error("Could not get default encoder(s)"=
, NULL);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D AVERROR_EXIT;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
>=C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 if (fmt->audio_codec !=3D AV_CODEC_ID_NONE) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 add_stream(&audio_st, oc, &audio_codec, fmt-=
>audio_codec);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 have_audio =3D 1;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 encode_audio =3D 1;
> -=C2=A0 =C2=A0 }
> -
> -=C2=A0 =C2=A0 /* Now that all the parameters are set, we can open the au=
dio and
> -=C2=A0 =C2=A0 * video codecs and allocate the necessary encode buffers. =
*/
> -=C2=A0 =C2=A0 if (have_video)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 open_video(oc, video_codec, &video_st, opt);
> -
> -=C2=A0 =C2=A0 if (have_audio)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 open_audio(oc, audio_codec, &audio_st, opt);
> -
> -=C2=A0 =C2=A0 av_dump_format(oc, 0, filename, 1);
>=C2=A0=20
> -=C2=A0 =C2=A0 /* open the output file, if needed */
> -=C2=A0 =C2=A0 if (!(fmt->flags & AVFMT_NOFILE)) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 ret =3D avio_open(&oc->pb, filename, AVIO_FL=
AG_WRITE);
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Could not ope=
n '%s': %s\n", filename,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 av=
_err2str(ret));
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return 1;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> +=C2=A0 =C2=A0 if (process_audio) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* Prepare the audio encoder*/
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D init_encoder(&audio_enc_ctx, &a=
udio_enc_params)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 enc_timebases[0] =3D audio_enc_ctx->time_bas=
e;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 audio_in_params.frame_size=C2=A0 =3D audio_e=
nc_params.frame_size=C2=A0 =3D audio_enc_ctx->frame_size;
> +
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* Allocate an audio resampler and its input=
 and output AVFrames */
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D init_audio_convert(&audio_conve=
rt_ctx, &audio_in_params,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &audio_enc_p=
arams)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D init_avframe(&in_audio_frame, &=
audio_in_params)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D init_avframe(&converted_audio_f=
rame, &audio_enc_params)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 /* Write the stream header, if any. */
> -=C2=A0 =C2=A0 ret =3D avformat_write_header(oc, &opt);
> -=C2=A0 =C2=A0 if (ret < 0) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 fprintf(stderr, "Error occurred when opening=
 output file: %s\n",
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 av_err2str(ret))=
;
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 return 1;
> +=C2=A0 =C2=A0 if (process_video) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 video_enc_params.width=C2=A0 =3D video_in_pa=
rams.width;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 video_enc_params.height =3D video_in_params.=
height;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D init_encoder(&video_enc_ctx, &v=
ideo_enc_params)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 enc_timebases[1] =3D video_enc_ctx->time_bas=
e;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D init_video_convert(&video_conve=
rt_ctx,&video_in_params,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &video_enc_p=
arams)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D init_avframe(&in_video_frame, &=
video_in_params)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D init_avframe(&converted_video_f=
rame, &video_enc_params)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
>=C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 while (encode_video || encode_audio) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* select the stream to encode */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (encode_video &&
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (!encode_audio || av_compare_t=
s(video_st.next_pts, video_st.enc->time_base,
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 audio_st.next_pts, audio_st.enc->time_base) <=3D 0)) {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 encode_video =3D !write_video_=
frame(oc, &video_st);
> +=C2=A0 =C2=A0 /* Create the output container for the encoded frames */
> +=C2=A0 =C2=A0 if ((ret =3D init_muxer(&out_fmt_ctx, audio_enc_ctx, video=
_enc_ctx, fname)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 out_fmt_ctx->opaque =3D &enc_timebases;
> +
> +=C2=A0 =C2=A0 while (process_audio || process_video) {
> +
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 frame_to_encode =3D NULL;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 media_type =3D media_type_of_earlier_frame(i=
n_audio_frame, in_video_frame);
> +
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* fill and convert the input frames */
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (media_type =3D=3D AVMEDIA_TYPE_AUDIO) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 enc_ctx =3D audio_enc_ctx;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fill_dummy_s16_frame(in_audio_=
frame);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D convert_frame(aud=
io_convert_ctx, in_audio_frame,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 converted_audio_fra=
me)) !=3D 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!frame_exceeds_stream_dura=
tion(converted_audio_frame))
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 frame_to_encode =
=3D converted_audio_frame;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 } else {
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 encode_audio =3D !write_audio_=
frame(oc, &audio_st);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 enc_ctx =3D video_enc_ctx;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fill_dummy_yuv420p_frame(in_vi=
deo_frame);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D convert_frame(vid=
eo_convert_ctx, in_video_frame,
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 converted_video_fra=
me)) !=3D 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!frame_exceeds_stream_dura=
tion(in_video_frame))
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 frame_to_encode =
=3D converted_video_frame;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }
> -=C2=A0 =C2=A0 }
> -
> -=C2=A0 =C2=A0 av_write_trailer(oc);
>=C2=A0=20
> -=C2=A0 =C2=A0 /* Close each codec. */
> -=C2=A0 =C2=A0 if (have_video)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 close_stream(oc, &video_st);
> -=C2=A0 =C2=A0 if (have_audio)
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 close_stream(oc, &audio_st);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* encode the converted frames and mux the e=
ncoded packets */
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D encode_frame(enc_ctx, frame_to_=
encode, out_pkt)) =3D=3D 0) {
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if ((ret =3D mux_encoded_pkt(o=
ut_pkt, out_fmt_ctx, media_type)) < 0)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 goto end;
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 if (!(fmt->flags & AVFMT_NOFILE))
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* Close the output file. */
> -=C2=A0 =C2=A0 =C2=A0 =C2=A0 avio_closep(&oc->pb);
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 /* check if the encoders have been fully flu=
shed */
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 process_audio &=3D !((ret =3D=3D AVERROR_EOF=
) && (media_type =3D=3D AVMEDIA_TYPE_AUDIO));
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 process_video &=3D !((ret =3D=3D AVERROR_EOF=
) && (media_type =3D=3D AVMEDIA_TYPE_VIDEO));
>=C2=A0=20
> -=C2=A0 =C2=A0 /* free the stream */
> -=C2=A0 =C2=A0 avformat_free_context(oc);
> +=C2=A0 =C2=A0 }
>=C2=A0=20
> -=C2=A0 =C2=A0 return 0;
> +=C2=A0 =C2=A0 av_write_trailer(out_fmt_ctx);
> +=C2=A0 =C2=A0 ret =3D 0;
> +
> +end:
> +
> +=C2=A0 =C2=A0 avcodec_free_context(&audio_enc_ctx);
> +=C2=A0 =C2=A0 avcodec_free_context(&video_enc_ctx);
> +=C2=A0 =C2=A0 av_frame_free(&in_audio_frame);
> +=C2=A0 =C2=A0 av_frame_free(&in_video_frame);
> +=C2=A0 =C2=A0 av_frame_free(&converted_audio_frame);
> +=C2=A0 =C2=A0 av_frame_free(&converted_video_frame);
> +=C2=A0 =C2=A0 swr_free(&audio_convert_ctx);
> +=C2=A0 =C2=A0 sws_freeContext(video_convert_ctx);
> +=C2=A0 =C2=A0 if (out_fmt_ctx)
> +=C2=A0 =C2=A0 =C2=A0 =C2=A0 avio_closep(&out_fmt_ctx->pb);
> +=C2=A0 =C2=A0 avformat_free_context(out_fmt_ctx);
> +=C2=A0 =C2=A0 av_packet_free(&out_pkt);
> +
> +=C2=A0 =C2=A0 return ret;
>=C2=A0 }
> --=20
> 2.32.0

This isn't a thorough review since I'm not familiar enough with the mux=20
API to really say whether or not it was used correctly, but this is what=20
I noticed on first glance.
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 =20
------=_Part_9340923_218664257.1655598357190
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