Icecast ogg/flac output disconnects when switching to/from fallback source

[rmens]

This is a follow-up to #2965

The bug described in above ticket seems to be back in Liquidsoap 2.2.4 on Debian 12.

I'm using ogg/flac as input via SRT to output three streams to icecast: one mp3, one aac+ and one ogg/flac. When switching from the SRT source to a fallback file the ogg/flac stream disconnects and re-connects after that.

In the log there is an error 2024/02/19 20:14:31 [ZuidWest_FM:2] Error while sending data: could not write data to host: Unix.Unix_error(Unix.EPIPE, "write", "")!

My .liq file can be found here

The full log as reference:

2024/02/19 20:14:14 >>> LOG START
2024/02/19 20:14:09 [ffmpeg.filter.bitstream:3] No valid mode found for filter pgs_frame_merge!
2024/02/19 20:14:09 [main:3] Liquidsoap 2.2.4-1
2024/02/19 20:14:09 [clock:3] Using native (high-precision) implementation for latency control
2024/02/19 20:14:13 [main:3] Standard library loaded in 4.31 seconds.
2024/02/19 20:14:14 [frame:3] Using 44100Hz audio, 25Hz video, 44100Hz main.
2024/02/19 20:14:14 [frame:3] Video frame size set to: 1280x720
2024/02/19 20:14:14 [frame:3] Frame size must be a multiple of 1764 ticks = 1764 audio samples = 1 video samples.
2024/02/19 20:14:14 [frame:3] Targeting 'frame.duration': 0.04s = 1764 audio samples = 1764 ticks.
2024/02/19 20:14:14 [frame:3] Frames last 0.04s = 1764 audio samples = 1 video samples = 1764 ticks.
2024/02/19 20:14:14 [sandbox:3] Sandboxing disabled
2024/02/19 20:14:14 [startup:3] DSSI plugins registration: 0.00s
2024/02/19 20:14:14 [startup:3] FFmpeg filters registration: 0.02s
2024/02/19 20:14:14 [startup:3] FFmpeg bitstream filters registration: 0.00s
2024/02/19 20:14:14 [startup:3] Lilv plugins registration: 0.00s
2024/02/19 20:14:14 [startup:3] Frei0r plugin registration: 0.00s
2024/02/19 20:14:14 [startup:3] LADSPA plugins registration: 0.00s
2024/02/19 20:14:14 [startup:3] Typechecking: 4.11s
2024/02/19 20:14:14 [startup:3] Evaluation: 0.01s
2024/02/19 20:14:14 [startup:3] Typechecking: 0.03s
2024/02/19 20:14:14 [startup:3] Evaluation: 0.00s
2024/02/19 20:14:14 [startup:3] Typechecking: 0.01s
2024/02/19 20:14:14 [startup:3] Evaluation: 0.42s
2024/02/19 20:14:14 [startup:3] Loaded /etc/liquidsoap/radio.liq: 0.42s
2024/02/19 20:14:14 [blank.strip:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [buffer.producer:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [dummy:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [stereotool.2:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [stereotool:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [source:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [single:3] "/var/audio/fallback.ogg" is static, resolving once for all...
2024/02/19 20:14:14 [stereotool:3] Stereotool initialized! Valid license: true, latency: 0.14s, API/software version: 256/10210
2024/02/19 20:14:14 [single:3] Prepared "/var/audio/fallback.ogg" (RID 0).
2024/02/19 20:14:14 [ZuidWest_FM:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [ZuidWest_FM.2:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [ZuidWest_FM.3:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [clock.main:3] Streaming loop starts in auto-sync mode
2024/02/19 20:14:14 [clock.main:3] Delegating synchronization to CPU clock
2024/02/19 20:14:14 [buffer.consumer:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [safe_blank:3] Content type is {audio=pcm(stereo)}.
2024/02/19 20:14:14 [clock.input.srt:3] Streaming loop starts in auto-sync mode
2024/02/19 20:14:14 [clock.input.srt:3] Delegating synchronization to CPU clock
2024/02/19 20:14:14 [video.converter:3] Using preferred video converter: ffmpeg.
2024/02/19 20:14:14 [audio.converter:3] Using samplerate converter: libsamplerate.
2024/02/19 20:14:14 [video.text:3] Using sdl implementation
2024/02/19 20:14:15 [switch.2:3] Switch to source.
2024/02/19 20:14:15 [mksafe:3] Switch to safe_blank.
2024/02/19 20:14:15 [ZuidWest_FM:3] Connecting mount /zuidwest.stl for source@localhost...
2024/02/19 20:14:15 [ZuidWest_FM:3] Connection setup was successful.
2024/02/19 20:14:15 [ZuidWest_FM.2:3] Connecting mount /zuidwest.mp3 for source@localhost...
2024/02/19 20:14:15 [ZuidWest_FM.2:3] Connection setup was successful.
2024/02/19 20:14:15 [ZuidWest_FM.3:3] Connecting mount /zuidwest.aac for source@localhost...
2024/02/19 20:14:15 [ZuidWest_FM.3:3] Connection setup was successful.
2024/02/19 20:14:16 [switch.2:3] Switch to blank.strip with transition.
2024/02/19 20:14:31 [switch.2:3] Switch to source with forgetful transition.
2024/02/19 20:14:31 [ZuidWest_FM:2] Error while sending data: could not write data to host: Unix.Unix_error(Unix.EPIPE, "write", "")!
2024/02/19 20:14:31 [ZuidWest_FM:3] Closing connection...
2024/02/19 20:14:31 [ZuidWest_FM:3] Will try to reconnect in 3.00 seconds.
2024/02/19 20:14:35 [ZuidWest_FM:3] Connecting mount /zuidwest.stl for source@localhost...
2024/02/19 20:14:35 [ZuidWest_FM:3] Connection setup was successful.