When ingesting WHIP, Audio on LL-HLS is always Mono and very bad

[zapf2000]

Which version are you using?

v0.0.0

Which operating system are you using?

• [ x] Linux amd64 standard
• Linux amd64 Docker
• Linux arm64 standard
• Linux arm64 Docker
• Linux arm7 standard
• Linux arm7 Docker
• Linux arm6 standard
• Linux arm6 Docker
• Windows amd64 standard
• Windows amd64 Docker (WSL backend)
• macOS amd64 standard
• macOS amd64 Docker
• Other (please describe)

Describe the issue

When ingesting WHIP, audio is very good on the WHEP Stream (Stereo), but when listening the LL-HLS Stream, Audio is very poor Mono Quality (all tested browsers can handle Opus on LL-Hls, but only Mono). This is completely Video Codec independent. When I ingest using RTMP (OBS), LL-HLS sound perfect, but in this case I have no WebRTC Stream (because of AAC instead of Opus).

Describe how to replicate the issue

1. start the server
2. publish with vdo.ninja in browser (Chrome)
3. read with any AV1 supporting browser (Chrome)

Did you attach the server logs?

no

Did you attach a network dump?

no

[aler9]

Hello, thanks for reporting the issue, i was able to replicate it by using OBS and WHIP. It turned out that Opus tracks published through WHIP didn't have the stereo flag correctly set. This is fixed by #2470. You can test the fix by using the nightly released available in this page (click on "Binaries"):

https://github.com/bluenviron/mediamtx/actions/runs/6984767731

[github-actions]

This issue is mentioned in release v1.3.1 🚀
Check out the entire changelog by clicking here