Re: [FFmpeg-devel] [PATCH] avformat/flvenc: fix EOS tag

[Steven Liu <lq@chinaffmpeg.org>]

> 2023年2月7日 05:25，Zhao Zhili <quinkblack@foxmail.com> 写道：
> 
> From: Zhao Zhili <zhilizhao@tencent.com>
> 
> FLV spec only has AVC end of sequence tag, and the EOS tag has a
> CodecID as other video data packet. MPEG4 doesn't conformance to
> the spec, but it's there for a decade. So only 'fix' the EOS tag
> rather than remove it completely.
> 
> Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
> ---
> libavformat/flvenc.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
> index 128ae8ebc0..8830c03044 100644
> --- a/libavformat/flvenc.c
> +++ b/libavformat/flvenc.c
> @@ -235,13 +235,16 @@ static void put_timestamp(AVIOContext *pb, int64_t ts) {
>     avio_w8(pb, (ts >> 24) & 0x7F);
> }
> 
> -static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
> +static void put_eos_tag(AVIOContext *pb, unsigned ts, enum AVCodecID codec_id)
> {
> +    uint32_t tag = ff_codec_get_tag(flv_video_codec_ids, codec_id);
> +    /* ub[4] FrameType = 1, ub[4] CodecId */
> +    tag |= 1 << 4;
>     avio_w8(pb, FLV_TAG_TYPE_VIDEO);
>     avio_wb24(pb, 5);               /* Tag Data Size */
>     put_timestamp(pb, ts);
>     avio_wb24(pb, 0);               /* StreamId = 0 */
> -    avio_w8(pb, 23);                /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
> +    avio_w8(pb, tag);
>     avio_w8(pb, 2);                 /* AVC end of sequence */
>     avio_wb24(pb, 0);               /* Always 0 for AVC EOS. */
>     avio_wb32(pb, 16);              /* Size of FLV tag */
> @@ -783,7 +786,7 @@ end:
>             FLVStreamContext *sc = s->streams[i]->priv_data;
>             if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
>                     (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4))
> -                put_avc_eos_tag(pb, sc->last_ts);
> +                put_eos_tag(pb, sc->last_ts, par->codec_id);
>         }
>     }
> 
> -- 
> 2.25.1
> 
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LGTM


Thanks

Steven Liu

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