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Code Issues Releases Activity

avformat/flvenc: fix EOS tag

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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.

Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
This commit is contained in:
Zhao Zhili 2023-02-07 05:25:45 +08:00
parent 9f7e51e513
commit 59a9727c24
1 changed files with 6 additions and 3 deletions
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9
libavformat/flvenc.c
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@ -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);
}
}