Description of problem:
When doing WebRTC with a video stream from or to Firefox from the Fedora repository does not receive and send video.
The very same with Firefox from the tarball as provided by Mozilla works just fine.
Video codec in offer/answer SDP is VP8.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Go to https://appr.tc
2. Join a room
3. Grant cam/mic access
4. Local camera will show
5. Join the same room with another tab (copy the URL from the previous tab)
6. Grant cam/mic access
7. Local camera will show
4. Press join on the second tab
Only the local video shows, essentially nothing happens after join as no video is received / sent.
Page should flip and show the remote video big and the local video as a small overlay on the bottom right.
To see it working, do the same with the Firefox binary tarball as downloaded from https://www.mozilla.org (make sure to stop any running Firefox, before between the two).
Works for me with firefox-51.0.1-1.fc25.x86_64. Can you try a fresh profile?
In reply to Martin Stransky from comment #1)
> Works for me with firefox-51.0.1-1.fc25.x86_64. Can you try a fresh profile?
Nope, not for me, also not with a fresh profile. Essentially the whole system is fresh. Installed fc25 in virtualbox from the live cd. Default Firefox as installed there does not work. Load Firefox from Mozilla, works. Update Fedora Firefox to latest with dnf (which currently results in firefox-51.0.1-1.fc25.x86_64) also does not work.
Fedora Firefox is started with:
PROFILE=$(mtempd -d) && echo $PROFILE && /usr/bin/firefox -profile $PROFILE -no-remote -new-instance && echo $PROFILE && rm -rf $PROFILE
And the one from Mozilla:
PROFILE=$(mtempd -d) && echo $PROFILE && ./firefox -profile $PROFILE -no-remote -new-instance && echo $PROFILE && rm -rf $PROFILE
I initially found the behavior on a native machine where i got the report that WebRTC does not work with Fedora Firefox, and then reproduced in Virtualbox.
Is there any error in browser console? Tools -> Web Developer -> Browser console. How do you set the VP8 codec?
(In reply to Martin Stransky from comment #3)
> Is there any error in browser console? Tools -> Web Developer -> Browser
> console. How do you set the VP8 codec?
Unfortunately not. Also Firefox 51 got support for VP9 and appr.tc seems to use it by default. So i guess the issue is about VPX as neither VP8 as used in Firefox 50 nor VP9 in Firefox 51 work. Both work with the tarballs downloaded from Mozilla (in 50 and 51).
Also the SDPs in about:webrtc are fine and all appears good. Video data seems to flow both directions (outbound and inbound rtp_video data increases when refreshing about:webrtc). Audio also works just fine (a bit hard to test on a single machine due to AEC though).
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