Is there a way to use RTPSession with VP9

[tribaud]

Hello,
we have done a Webrtc application with SIPSorcery 5.1.2 (not the latest) and SipSorcery.FFMpeg for video encoding.

We do not need audio and we actually achieve encoding video with ffmpeg on linux with H264 and VP8.

• The video h264 is good but it works only with chrome browser as a client (Firefox disabled the support of H264 natively)
• The video VP8 is using libvpx with one pass and the quality is really poor (but it works with a firefox client)

So we try to go to VP9:
We saw some unit tests in this repository dealing with VP9
And when we look in ffmpegVideoEncoder.cs it seems to be able to support VP9

But the question is : is it a big deal to add VP9 support in RTPSession ?

When we test it the Channel is closed with the VideoIncompatible reason....

sipsorcery/src/net/RTP/RTPSession.cs

Line 670 in d1a2f2b

return SetDescriptionResultEnum.VideoIncompatible;

Thanks for your answer.

[sipsorcery]

The reason is here. You'll note there is no VP9 packetisation. Yet another thing I didn't get around to.

I haven't looked into it but I think VP8 and VP9 packetisation are the same, however, I could be wrong. If they are the same then in theory it would not be a big deal to add support to RTPSession. If not, it would be a big deal.