Obs-studio: m3u8 recording stucks after 14 or 33 segments

[DaWe35]

I'm recording into m3u8 on Windows 10 and after n number of .ts sectors are recorded, nothing happens. No error message, CPU/GPU performaces are the same, it just do not generate any new files, and when I click Stop recording, it never stops - I need to shutdown OBS from taks manager.

With OBS 23.2.1 I can record 16 segments
With OBS 24.0.3 I can record 33 segments before stuck
With OBS 25.0-rc5 I can record 16 segments
With OBS 25.0.1 I can record 14 segments

I tried out a lot of options, same happened with m3u8.

Expected Behavior

Record infinite .ts segments.

Current Behavior

Stuck at 14, 16, or 33, depends on the version.

Steps to Reproduce

1. Set the Recording format to m3u8
2. Start recording
3. Wait for 14/33 files

Additional information

logs.zip

[derrod]

This is normal, by default the hls muxer will produce a live playlist with a limited time window:

See this in the logs:

17:32:30.381: [ffmpeg muxer: 'simple_file_output'] Using muxer settings:
17:32:30.381:   hls_time=30
17:32:30.381:   hls_list_size=0

Check ffmpeg documentation for how to correctly configure this muxer: https://ffmpeg.org/ffmpeg-formats.html#hls-2 Keep in mind that muxer parameters in OBS have the a space separated format like key=value key2=value2.

[DaWe35]

This is normal, by default the hls muxer will produce a live playlist with a limited time window:

See this in the logs:

17:32:30.381: [ffmpeg muxer: 'simple_file_output'] Using muxer settings:
17:32:30.381:     hls_time=30
17:32:30.381:     hls_list_size=0

Check ffmpeg documentation for how to correctly configure this muxer: https://ffmpeg.org/ffmpeg-formats.html#hls-2 Keep in mind that muxer parameters in OBS have the a space separated format like key=value key2=value2.

@derrod is it normal that I need to kill OBS from task manager? Is it normal that I lost my data?

• The same happens with and without custom mixer settings.

(I used hls_time=30, because with this setting (and with 24.0.3), I can record ~15 mins. As I said, the issue happens with and without it)

[DaWe35]

I recorded my screen: https://www.youtube.com/watch?v=VitmvCyZoko

[derrod]

Alright I misunderstood what the issue was and I can reproduce now, apologies.

Seems like the ffmpeg muxer is somehow locking up, that'll take some time to figure out...

[cthurston]

We've tested m3u8 local recording on 5 different machines with the following results:
MacOS, OBS 25 - Works great software and hardware encode. (Software encode with ffmpeg hls).
Windows, OBS 24, 25 - Will record 19 segments (40 seconds) then freeze with hardware encoding. With software encode it seems to work fine.

Given those results we think the issue is somewhere with windows and hardware encoding. Hopefully this helps track down the issue.

[Delivator]

I'm having the same issue!

[craigkehl]

Tested this issue with OBS 26.0.0:
MacOS Catalina 10.15.7 - Works as mentioned above
Windows 10 2004 19041.508 - Will record 1 segment before crashing.