ChanServ changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.1.1 is released
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<Nino>
Hi everybody! I've got a question regarding ffmpeg and websockets. I'm currently developing a Python-App, which uses ffmpeg to collect system audio and streams it via a websocket to a server. However, I'm suffering websocket timeouts after exactly 40s depending on the ffmpeg configuration.
<Nino>
I run the app on Linux with Docker using pulse audio with a loopback sink. Using an artificial sine using lavfi it's working well, only using the system audio or overlaying my system audio with the artifical sine the websocket runs into the timeout.
<Nino>
Any suggestions what I could check? Thank you very much in advance!
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<Nintendo>
Nino, are you able to provide the commands you use for the sine wave and the sine wave mixed with system audio?
<Nino>
Yes, sure! I use a Python subprocess with this command:
<Nino>
ffmpeg_cmd = [
<Nino>
"ffmpeg",
<Nino>
"-f",
<Nino>
"lavfi",
<Nino>
"-i",
<Nino>
"sine=frequency=5:sample_rate=44100",
<Nino>
"-f",
<Nino>
"pulse",
<Nino>
"-i",
<Nino>
"loopback_sink.monitor",
<Nino>
"-filter_complex",
<Nino>
"[0:a][1:a]amix=inputs=2:duration=first",
<Nino>
"-f",
<Nino>
"wav",
<Nino>
"-acodec",
<Nino>
"pcm_s16le",
<Nino>
"pipe:1",
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<Nintendo>
And when you remove the complex filter and associated arguments, timeout issues disappear?
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<Nintendo>
Otherwise, there are no issues until 40 seconds pass?
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<Nino>
Until 40 seconds there are no issues, the audio is transferred well and everything works. Then my websocket cuts the connection for idk which reason...
<Nino>
When using this command everything works fine forever:
<Nino>
ffmpeg_cmd = [
<Nino>
"ffmpeg",
<Nino>
"-f",
<Nino>
"lavfi",
<Nino>
"-i",
<Nino>
"sine=frequency=5:sample_rate=44100",
<Nino>
"-f",
<Nino>
"wav",
<Nino>
"-acodec",
<Nino>
"pcm_s16le",
<Nino>
"pipe:1",
<Nino>
]
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<Nino>
I wonder how ffmpeg and my websocket is interacting? I also tried to run ffmpeg in a separate thread to really disconnect, but still it somehow cuts the websocket
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<BtbN>
Could you maybe not flood the channel? Thanks.
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<BlindRepublic>
bpmedley Hey, I ended up getting farther with playing an audio file with libav. The file plays and I can sort of hear bits and pieces of what's on the file but it is mostly white noise. Could you give me a hint as to where to go from here? https://gitlab.com/elliotlurie/play-file
<BlindRepublic>
If anyone else wants to take a look, I'm trying to use libavdevice, but there aren't any examples for setting it up in the docs
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<johnjaye>
BlindRepublic: let me know if you succeed. or consider writing a guide to what you did
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<BlindRepublic>
Will do!
<BlindRepublic>
If I can actually figure it out
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<BtbN>
johnjaye: aevalsrc
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