Does SRS support push HEVC/H.265 over WebRTC(whip) using OBS ?

[Zhanghailin1995]

Describe the bug
Does SRS support push HEVC/H.265 over WebRTC using OBS ? I don't know whether SRS or OBS does not support push HEVC/H.265 over WebRTC ?

Version
SRS 6.0.155

[suzp1984]

I think it's a bug, HEVC/H.264 over WebRTC is supported by SRS, but when it is the WHIP publish, the code will force RTC downgrade to H.264 during SDP negotiation.

srs/trunk/src/app/srs_app_rtc_conn.cpp

Lines 2754 to 2757 in 7416134

	} else if (remote_media_desc.is_video()) {
	std::vector<SrsMediaPayloadType> payloads = remote_media_desc.find_media_with_encoding_name("H264");
	if (payloads.empty()) {
	return srs_error_new(ERROR_RTC_SDP_EXCHANGE, "no found valid H.264 payload type");

There's a recent related issue #4259 , which is publish by GB28181 with HEVC, but play offer said SRS only support H.264.
Maybe adjust the SDP negotiation can fix this issue, I'll try later.

[Zhanghailin1995]

I think it's a bug, HEVC/H.264 over WebRTC is supported by SRS, but when it is the WHIP publish, the code will force RTC downgrade to H.264 during SDP negotiation.

srs/trunk/src/app/srs_app_rtc_conn.cpp

Lines 2754 to 2757 in 7416134

	} else if (remote_media_desc.is_video()) {
	std::vector<SrsMediaPayloadType> payloads = remote_media_desc.find_media_with_encoding_name("H264");
	if (payloads.empty()) {
	return srs_error_new(ERROR_RTC_SDP_EXCHANGE, "no found valid H.264 payload type");

There's a recent related issue #4259 , which is publish by GB28181 with HEVC, but play offer said SRS only support H.264. Maybe adjust the SDP negotiation can fix this issue, I'll try later.

I made a mistake, I didn't add codec=hevc in the whip url parameters. After I did this, It worked

[suzp1984]

oh, I just knows that.
repeat the solution: use the whip url with codec: http://localhost:1985/rtc/v1/whip/?app=live&stream=livestream&codec=hevc

[Zhanghailin1995]

oh, I just knows that. repeat the solution: use the whip url with codec: http://localhost:1985/rtc/v1/whip/?app=live&stream=livestream&codec=hevc

push stream was successful, but it still cannot be played normally in Chrome, even though I have turned on hardware-accelerated video decode flag. can you try it?

[Zhanghailin1995]

I I found a way to play the hevc stream over WebRTC in chrome. Add two param to start chrome "--enable-features=WebRtcAllowH265Receive --force-fieldtrials=WebRTC-Video-H26xPacketBuffer/Enabled".