OBS Windows re-broadcast causes "decode failed: moq: protocol violation" error

[danrossi]

I tested on mac starting / stopping then starting a broadcast to a Windows relay and it's fine. The OBS Windows plugin since the libmoq changes I get these errors when rebroadcasting. I am not sure what the error means yet.

A working merged branch to get windows / mac builds working with a console debug window for Windows. Where the rust logs are showing.

https://github.com/danrossi/obs/tree/win-build-fix-merged

←[2m2026-05-18T09:37:41.099819Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.133342Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.166711Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.199924Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.232368Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.266603Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.297943Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.333312Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.366689Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.400073Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation
←[2m2026-05-18T09:37:41.415163Z←[0m ←[34mDEBUG←[0m ←[2mmoq_mux::import::avc3←[0m←[2m:←[0m ending track ←[3mname←[0m←[2m=←[0m"1.avc3"
←[2m2026-05-18T09:37:41.415316Z←[0m ←[34mDEBUG←[0m ←[2mmoq_mux::import::aac←[0m←[2m:←[0m ending track ←[3mname←[0m←[2m=←[0m"1.aac"
←[2m2026-05-18T09:37:41.415660Z←[0m ←[32m INFO←[0m ←[2mmoq_lite::lite::session←[0m←[2m:←[0m session terminated
←[2m2026-05-18T09:37:41.415782Z←[0m ←[34mDEBUG←[0m ←[2mmoq_lite::lite::publisher←[0m←[2m:←[0m announcing cancelled ←[3mprefix←[0m←[2m=←[0m
←[2m2026-05-18T09:37:41.426214Z←[0m ←[34mDEBUG←[0m ←[2mmoq_mux::import::aac←[0m←[2m:←[0m starting track ←[3mname←[0m←[2m=←[0m"2.aac" ←[3mconfig←[0m←[2m=←[0mAudioConfig { codec: AAC(AAC { profile: 2 }), sample_rate: 48000, channel_count: 2, bitrate: None, description: None, container: Legacy, jitter: None }
←[2m2026-05-18T09:37:41.447208Z←[0m ←[34mDEBUG←[0m ←[2mmoq_mux::import::avc3←[0m←[2m:←[0m updated catalog ←[3mname←[0m←[2m=←[0m"2.avc3" ←[3mconfig←[0m←[2m=←[0mVideoConfig { codec: H264(H264 { inline: true, profile: 100, constraints: 0, level: 31 }), description: None, coded_width: Some(1280), coded_height: Some(720), display_ratio_width: None, display_ratio_height: None, bitrate: None, framerate: None, optimize_for_latency: None, container: Legacy, jitter: None }
←[2m2026-05-18T09:37:41.447726Z←[0m ←[31mERROR←[0m ←[2mmoq::error←[0m←[2m:←[0m decode failed: moq: protocol violation

[coderabbitai]

🔗 Related PRs

#13 - Use the new libmoq consume API [merged]
#14 - Add MoQ Source for receiving broadcasts [merged]
#27 - Fix Windows build compatibility issues [merged]

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[danrossi]

I tinkered and found the problem. Not across c++ or rust but there is a map empty check required on the tracks, as OBS tries to get data after signalling a stop success. So an OBS bug. The data poll is quicker than signalling stop.