[FFmpeg-devel] [PATCH] avformat: add AV1 RTP depacketizer and packetizer

[Chris Hodges]

Hi,

On 11/25/24 18:47, Tristan Matthews via ffmpeg-devel wrote:

> One nit I'd add is that since the RTP AV1 spec is still in draft (according to https://aomediacodec.github.io/av1-rtp-spec/) this feature should probably be marked experimental as is done for VP9 in RTP, see:
> https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/f8e91ab05ff3d111626ab8a3b5d570865a934f07:/libavformat/rtpenc.c#l221
> 
> in which case CLI users will have to add `-strict experimental` to their options.

I've added this as suggested.

> For the keyframe detection issue I'm not sure if this is something missing in FFMPEG's RTP stack (e.g. I've noticed that both GStreamer and libwebrtc signal that a buffer contains a keyframe at a higher level), but if not could you set it if you're dealing with a FRAME OBU of type 0 (keyframe) or 2 (intra-only)? You'd need to parse the OBU to extract that however.

It turns out this was a lapsus on my side, when I used the flags field 
in the RTPMuxContext structure instead of the flags in AVPacket. After 
transferring the key frame information to the encoder function, I could 
remove the workaround.

I also added the key frame info to the AVPacket during demuxing that was 
missing before.

New patch attached.

-- 
Best regards, Chris
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