Re: [FFmpeg-devel] [PATCH] avcodec/mfenc: expose more properties of the media foundation encoder

[Mark Thompson <sw@jkqxz.net>]

On 28/03/2024 12:34, Mark Samuelson wrote:
> Thank you for the notes, here is a new patch that incorporates your suggestions.  You are right, the default value of 12 for gop_size is suprising, I didn't know about it before now.
> 
> ---
>   libavcodec/mf_utils.h |  5 +++++
>   libavcodec/mfenc.c    | 33 +++++++++++++++++++++++++++------
>   2 files changed, 32 insertions(+), 6 deletions(-)

Patch looks good.

I did a bit of testing with the Microsoft H.264 MFT: GOP size and compression level work as expected, and VBV parameters seem to be doing something sensible.

Under what conditions are you expecting global_quality -> AVEncVideoEncodeQP to do anything, though?  When I set it alone the output was always identical regardless of what value I set it to.  (Including with "-rate_control quality".)

Thanks,

- Mark

> diff --git a/libavcodec/mf_utils.h b/libavcodec/mf_utils.h
> index aebfb9ad21..387c005f38 100644
> --- a/libavcodec/mf_utils.h
> +++ b/libavcodec/mf_utils.h
> @@ -97,6 +97,11 @@ DEFINE_GUID(ff_CODECAPI_AVEncH264CABACEnable,    0xee6cad62, 0xd305, 0x4248, 0xa
>   DEFINE_GUID(ff_CODECAPI_AVEncVideoForceKeyFrame, 0x398c1b98, 0x8353, 0x475a, 0x9e, 0xf2, 0x8f, 0x26, 0x5d, 0x26, 0x3, 0x45);
>   DEFINE_GUID(ff_CODECAPI_AVEncMPVDefaultBPictureCount, 0x8d390aac, 0xdc5c, 0x4200, 0xb5, 0x7f, 0x81, 0x4d, 0x04, 0xba, 0xba, 0xb2);
>   DEFINE_GUID(ff_CODECAPI_AVScenarioInfo, 0xb28a6e64,0x3ff9,0x446a,0x8a,0x4b,0x0d,0x7a,0x53,0x41,0x32,0x36);
> +DEFINE_GUID(ff_CODECAPI_AVEncCommonBufferSize, 0x0db96574, 0xb6a4, 0x4c8b, 0x81, 0x06, 0x37, 0x73, 0xde, 0x03, 0x10, 0xcd);
> +DEFINE_GUID(ff_CODECAPI_AVEncCommonMaxBitRate, 0x9651eae4, 0x39b9, 0x4ebf, 0x85, 0xef, 0xd7, 0xf4, 0x44, 0xec, 0x74, 0x65);
> +DEFINE_GUID(ff_CODECAPI_AVEncCommonQualityVsSpeed, 0x98332df8, 0x03cd, 0x476b, 0x89, 0xfa, 0x3f, 0x9e, 0x44, 0x2d, 0xec, 0x9f);
> +DEFINE_GUID(ff_CODECAPI_AVEncMPVGOPSize, 0x95f31b26, 0x95a4, 0x41aa, 0x93, 0x03, 0x24, 0x6a, 0x7f, 0xc6, 0xee, 0xf1);
> +DEFINE_GUID(ff_CODECAPI_AVEncVideoEncodeQP, 0x2cb5696b, 0x23fb, 0x4ce1, 0xa0, 0xf9, 0xef, 0x5b, 0x90, 0xfd, 0x55, 0xca);
>   
>   DEFINE_GUID(ff_MF_SA_D3D11_BINDFLAGS, 0xeacf97ad, 0x065c, 0x4408, 0xbe, 0xe3, 0xfd, 0xcb, 0xfd, 0x12, 0x8b, 0xe2);
>   DEFINE_GUID(ff_MF_SA_D3D11_USAGE, 0xe85fe442, 0x2ca3, 0x486e, 0xa9, 0xc7, 0x10, 0x9d, 0xda, 0x60, 0x98, 0x80);
> diff --git a/libavcodec/mfenc.c b/libavcodec/mfenc.c
> index 9225692c51..cad531bd7d 100644
> --- a/libavcodec/mfenc.c
> +++ b/libavcodec/mfenc.c
> @@ -695,6 +695,21 @@ FF_ENABLE_DEPRECATION_WARNINGS
>           if (c->opt_enc_quality >= 0)
>               ICodecAPI_SetValue(c->codec_api, &ff_CODECAPI_AVEncCommonQuality, FF_VAL_VT_UI4(c->opt_enc_quality));
>   
> +        if (avctx->rc_max_rate > 0)
> +            ICodecAPI_SetValue(c->codec_api, &ff_CODECAPI_AVEncCommonMaxBitRate, FF_VAL_VT_UI4(avctx->rc_max_rate));
> +
> +        if (avctx->gop_size > 0)
> +            ICodecAPI_SetValue(c->codec_api, &ff_CODECAPI_AVEncMPVGOPSize, FF_VAL_VT_UI4(avctx->gop_size));
> +
> +        if(avctx->rc_buffer_size > 0)
> +            ICodecAPI_SetValue(c->codec_api, &ff_CODECAPI_AVEncCommonBufferSize, FF_VAL_VT_UI4(avctx->rc_buffer_size));
> +
> +        if(avctx->compression_level >= 0)
> +            ICodecAPI_SetValue(c->codec_api, &ff_CODECAPI_AVEncCommonQualityVsSpeed, FF_VAL_VT_UI4(avctx->compression_level));
> +
> +        if(avctx->global_quality > 0)
> +            ICodecAPI_SetValue(c->codec_api, &ff_CODECAPI_AVEncVideoEncodeQP, FF_VAL_VT_UI4(avctx->global_quality ));
> +
>           // Always set the number of b-frames. Qualcomm's HEVC encoder on SD835
>           // defaults this to 1, and that setting is buggy with many of the
>           // rate control modes. (0 or 2 b-frames works fine with most rate
> @@ -1223,7 +1238,7 @@ static int mf_init(AVCodecContext *avctx)
>   
>   #define OFFSET(x) offsetof(MFContext, x)
>   
> -#define MF_ENCODER(MEDIATYPE, NAME, ID, OPTS, FMTS, CAPS) \
> +#define MF_ENCODER(MEDIATYPE, NAME, ID, OPTS, FMTS, CAPS, DEFAULTS) \
>       static const AVClass ff_ ## NAME ## _mf_encoder_class = {                  \
>           .class_name = #NAME "_mf",                                             \
>           .item_name  = av_default_item_name,                                    \
> @@ -1243,6 +1258,7 @@ static int mf_init(AVCodecContext *avctx)
>           FMTS                                                                   \
>           CAPS                                                                   \
>           .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,                           \
> +		.defaults       = DEFAULTS,                                            \
>       };
>   
>   #define AFMTS \
> @@ -1252,9 +1268,9 @@ static int mf_init(AVCodecContext *avctx)
>           .p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_HYBRID |           \
>                             AV_CODEC_CAP_DR1 | AV_CODEC_CAP_VARIABLE_FRAME_SIZE,
>   
> -MF_ENCODER(AUDIO, aac,         AAC, NULL, AFMTS, ACAPS);
> -MF_ENCODER(AUDIO, ac3,         AC3, NULL, AFMTS, ACAPS);
> -MF_ENCODER(AUDIO, mp3,         MP3, NULL, AFMTS, ACAPS);
> +MF_ENCODER(AUDIO, aac,         AAC, NULL, AFMTS, ACAPS, NULL);
> +MF_ENCODER(AUDIO, ac3,         AC3, NULL, AFMTS, ACAPS, NULL);
> +MF_ENCODER(AUDIO, mp3,         MP3, NULL, AFMTS, ACAPS, NULL);
>   
>   #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
>   static const AVOption venc_opts[] = {
> @@ -1283,6 +1299,11 @@ static const AVOption venc_opts[] = {
>       {NULL}
>   };
>   
> +static const FFCodecDefault defaults[] = {
> +    { "g", "0" },
> +    { NULL },
> +};
> +
>   #define VFMTS \
>           .p.pix_fmts     = (const enum AVPixelFormat[]){ AV_PIX_FMT_NV12,       \
>                                                           AV_PIX_FMT_YUV420P,    \
> @@ -1291,5 +1312,5 @@ static const AVOption venc_opts[] = {
>           .p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_HYBRID |           \
>                             AV_CODEC_CAP_DR1,
>   
> -MF_ENCODER(VIDEO, h264,        H264, venc_opts, VFMTS, VCAPS);
> -MF_ENCODER(VIDEO, hevc,        HEVC, venc_opts, VFMTS, VCAPS);
> +MF_ENCODER(VIDEO, h264,        H264, venc_opts, VFMTS, VCAPS, defaults);
> +MF_ENCODER(VIDEO, hevc,        HEVC, venc_opts, VFMTS, VCAPS, defaults);
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