ERR: muxer error: unable to extract DTS: invalid POC

[andrew-ld]

Which version are you using?

25dc252

Which operating system are you using?

https://github.com/andrew-ld/rtsp-simple-server/blob/e24eaba1ffc80e1e8ee297fab2f55e4747ef0882/Dockerfile

Describe the issue

When retransmitting an rtsp stream from ffmpeg to rtsp-simple-server using runOnInit about every minute I get an error from the hls muxer (hlsAlwaysRemux is active).

the affected log lines are these

2023/03/10 08:58:08 WAR [RTSP] [session dfc6ecdc] 2 RTP packet(s) lost

2023/03/10 08:58:08 INF [HLS] [muxer vdeo_52089] ERR: muxer error: unable to extract DTS: invalid POC

often when the muxer gives this problem a few moments earlier rtsp complains about packet loss

I use these options with ffmpeg:

ffmpeg -rtsp_transport tcp -i $[RTSP_UPSTREAM_URL} \
 -c copy \
 -f segment -segment_time 00:30:00 -reset_timestamps 1 -strftime 1 \
 /${STORAGE}/output#%Y-%m-%d_%H-%M-%S-%z#${DEVICE_ID}.ts \
 -c:v copy -c:a libopus -b:a 16k \
 -f rtsp rtsp://ffmpeg:${PUBLISH_SECRET}@localhost:${RTSP_PORT}/${RTSP_PATH}

the same stream by connecting it directly to rtsp-simple-server does not give this problem, it seems that only retransmitting it gives this problem.

I have tried adding various hacks to ffmpeg such as

• use_wallclock_as_timestamps
• map 0:0
• fflags +igndts+genpts

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[aler9]

Hello,

In order to record incoming streams, my advice is to use FFmpeg inside runOnReady as described here:
https://github.com/aler9/rtsp-simple-server#save-streams-to-disk

Eventually the recording feature will be integrated into the server as described here #1399

The issue with using HLS to record streams is that most HLS client expects a clean playlist, without gaps in time and without errors, and that's the reason why segments and playlists are resetted in case of error.

Anyway, if you post a sample recording of the stream that causes the error, we can try to fix the error instead of adding workarounds. You can record the stream by using

ffmpeg -i rtsp://original-stream -t 00:02:00 -c copy -f mpegts record.ts

[yanhua1012]

I have encounter the same situation.
the console complain the error:
[HLS] [muxer vdeo_52089] ERR: muxer error: unable to extract DTS: invalid POC

I resolve it by issue the command
ffmpeg.exe -rtsp_transport tcp -i rtsp://xxxx:[email protected]/live1s1.sdp -vcodec libx264 -f rtsp -rtsp_transport tcp rtsp://localhost:8554/videoPath

the version of mediamtx.exe is 0.23.6
below is the record file link from rtsp video source
https://drive.google.com/file/d/1HvqLgkKf-c19jcjn5CZ9MfZ3UW8ICcMn/view?usp=sharing

below is the link of mediamtx.yml
https://drive.google.com/file/d/1EfKak99D6pcRjKc5_L3HmeYBU7roZyvy/view?usp=sharing

[aler9]

This error has been removed by bluenviron/mediacommon#55, timing-related issues are still possible and are tracked in #1002.

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