"IVF signature mismatch" if fed with GStreamer VP8 stream

[neilyoung]

Your environment.

• Version: livekit-server, livekit-client
• Browser: Chrome latest
• Other Information - stacktraces, related issues, suggestions how to fix, links for us to have context

What did you do?

See livekit/livekit-cli#251

What did you expect?

Should work with VP8 input as it works with H.264

What happened?

I'm using livekit-server/livekit-cli and GStreamer. Publishing a H.264 stream into the room works fine, VP8 not. I suppose the a.m. and described error comes out of your code, since live-xxx relies on that.

As seen here

webrtc/pkg/media/ivfreader/ivfreader.go

Line 25 in eed2bb2

errSignatureMismatch = errors.New("IVF signature mismatch")

and here

https://github.com/pion/webrtc/blob/eed2bb2d3b9f204f9de1cd7e1046ca5d652778d2/pkg/media/ivfreader/ivfreader.go#L140C25-L140C47

the code expects some head in the VP8 payload. I'm not sure how to produce that using GStreamer. Any hint?

[neilyoung]

The strange thing is: I can see the expected DKIF header, if I use an udpsink:

But not with a tcpserversink...

[Todilo]

Any progress on this. I face similar issue. I have tried two different vp9 encoded videos. One encoded myself using ffmpeg:

ffmpeg -i file_example_MP4_640_3MG.mp4 -c:v libvpx -b:v 1M output.webm

and one from example online:
https://base-n.de/webm/VP9%20Sample.html

[neilyoung]

In my case it was sufficient to add the avmux_ivf element to the pipeline before feeding PION:

... vp8enc deadline=1 ! avmux_ivf ...

[Todilo]

Is this from gstreamer or where does that piping occur? I use the example "play-from-disk" which uses the ivfreader.NewWith which crashes

[neilyoung]

Yes. Gstreamer

[neilyoung]

That being said, this is not an issue anymore for me and I'm going to close that.