OBS Software x264 encoder tune zerolatancy

[Grimonja]

Which version are you using?

v1.5.0

Which operating system are you using?

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

Describe the issue

Trying to stream to mediamtx with OBS x264 tune: zerolatancy results in

unable to decode AVCC: NALU count (22) exceeds maximum allowed (21)

Describe how to replicate the issue

Streaming with following settings:
https://dl.dropboxusercontent.com/scl/fi//cmmd3mdoqb0x5ztesadd3/obs64_QdhsH1t9JS.png?rlkey=3k7ycz4fjvca3edxnk7t64dsu

Did you attach the server logs?

no

Did you attach a network dump?

no

[Grimonja]

After some further testing this only happens if streaming at resolutions higher than 1080p
So streaming at 1440p with tune: zerolatency will cause this

[isometriq]

There are constants in bluenviron/mediacommon to set arbitrary restrictions. In that case the H264 slicing limits, resolution and bitrate I think.
https://github.com/bluenviron/mediacommon/blob/main/pkg/codecs/h264/h264.go

Is there a chance to allow configuration entries (mediamtx.yml) to override these?
Or are these constants for some reason (some spec or protocol limitation) ?

[aler9]

Thanks for reporting the issue, this is fixed by bluenviron/mediacommon#120

[github-actions]

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