[FFmpeg-devel] [PATCH] avformat/flvenc: write proper timestamps when muxing hevc

[FFmpeg-devel] [PATCH] avformat/flvenc: write proper timestamps when muxing hevc

[Timo Rothenpieler]

---
 libavformat/flvenc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index 335d900415..41636ba1b8 100644
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -863,6 +863,9 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
     else
         flags_size = 1;
 
+    if (par->codec_id == AV_CODEC_ID_HEVC && pkt->pts != pkt->dts)
+        flags_size += 3;
+
     if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
             || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC
             || par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) {
@@ -998,8 +1001,11 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
     } else {
         av_assert1(flags>=0);
         if (par->codec_id == AV_CODEC_ID_HEVC) {
-            avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFramesX | frametype); // ExVideoTagHeader mode with PacketTypeCodedFramesX
+            int pkttype = (pkt->pts != pkt->dts) ? PacketTypeCodedFrames : PacketTypeCodedFramesX;
+            avio_w8(pb, FLV_IS_EX_HEADER | pkttype | frametype); // ExVideoTagHeader mode with PacketTypeCodedFramesX
             avio_write(pb, "hvc1", 4);
+            if (pkttype == PacketTypeCodedFrames)
+                avio_wb24(pb, pkt->pts - pkt->dts);
         } else if (par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) {
             avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFrames | frametype);
             avio_write(pb, par->codec_id == AV_CODEC_ID_AV1 ? "av01" : "vp09", 4);
-- 
2.34.1

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Re: [FFmpeg-devel] [PATCH] avformat/flvenc: write proper timestamps when muxing hevc

[Steven Liu]

Timo Rothenpieler <timo@rothenpieler.org> 于2023年7月25日周二 08:01写道：
>
> ---
>  libavformat/flvenc.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
> index 335d900415..41636ba1b8 100644
> --- a/libavformat/flvenc.c
> +++ b/libavformat/flvenc.c
> @@ -863,6 +863,9 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
>      else
>          flags_size = 1;
>
> +    if (par->codec_id == AV_CODEC_ID_HEVC && pkt->pts != pkt->dts)
> +        flags_size += 3;
> +
>      if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
>              || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC
>              || par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) {
> @@ -998,8 +1001,11 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
>      } else {
>          av_assert1(flags>=0);
>          if (par->codec_id == AV_CODEC_ID_HEVC) {
> -            avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFramesX | frametype); // ExVideoTagHeader mode with PacketTypeCodedFramesX
> +            int pkttype = (pkt->pts != pkt->dts) ? PacketTypeCodedFrames : PacketTypeCodedFramesX;
> +            avio_w8(pb, FLV_IS_EX_HEADER | pkttype | frametype); // ExVideoTagHeader mode with PacketTypeCodedFramesX
>              avio_write(pb, "hvc1", 4);
> +            if (pkttype == PacketTypeCodedFrames)
> +                avio_wb24(pb, pkt->pts - pkt->dts);
>          } else if (par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) {
>              avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFrames | frametype);
>              avio_write(pb, par->codec_id == AV_CODEC_ID_AV1 ? "av01" : "vp09", 4);
> --
> 2.34.1
>
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LGTM
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