Unable to view stream from Firefox

[wellstring]

Firefox: 130.0.1
OS: Fedora 40 Silverblue

After starting a stream at https://b.siobud.com/ (stream key), the video does not display on Firefox, though the audio does. The stream works on my Android phone (also using Firefox), other devices outside of my home network, and on Chromium (on the same computer). Firefox has no issues streaming video from other sites (Youtube, Jellyfin, Bluesky, etc.), so I'm not sure what specifically about Broadcast Box would be an issue?

Please let me know if there is other information I could provide to help in troubleshooting. Thanks!

[Tathagata-0]

I have this issue as well, except it doesn't show the video on my phone either. In particular, when using AV1 or HEVC, this occurs, h.264 works normally. I get the issue on both a local host as well as https://b.siobud.com/api/whip.

[zapf2000]

As far as I know, Firefox currently doesn't support AV1 or HEVC in WebRTC. Only H264, VP8 and VP9 is supported according to Mozilla. H265 won't be supported anyway, caused by licensing issues. See https://developer.mozilla.org/en-US/docs/Web/Media/Formats/WebRTC_codecs

[Nyrrell]

Same issue here with AV1 on Firefox 132.0.1
Firefox support it https://caniuse.com/?search=av1 and i can watch video on youtube or on this github page https://caraya.github.io/av1-video-demo/

[zapf2000]

Firefox supports AV1 when using HLS, but it can't play AV1 WHEP.

[Nyrrell]

Oh i see, it's not the same thing, can't find relevant information about it

[Endeavourl]

FYI latest Firefox (136) supports AV1 for WebRTC and it works for me.

[JManch]

AOM AV1 and SVT-AV1 work for me but VAAPI AV1 is still a black screen sadly. Encoding with a 7900xt on Linux.

[Sphet98]

I have opened a bug report to Mozilla that can be found here: https://bugzilla.mozilla.org/show_bug.cgi?id=2017189
For me VAAPI av1 works when using chromium but not firefox. My OS is cachyos.

A workaround I found to get VAAPI AV1 working on firefox is to disable hardware decoding in firefox.