Recording audio from pulseaudio output monitor results in stretched audio:
- The audio falls out of sync as it moves slower than the video
- I've checked, the video is in sync, it's the audio that's the problem
- The audio pitch is lower as it's been stretched.
- This only happens with the output monitor, microphones are synced perfectly
- Debian sid
avconv -f pulse -i alsa_output.pci-0000_00_1b.0.analog-stereo.monitor -acodec copy out.wav
alsa[...]monitor is the name of the monitor of audio output as defined in
The speed difference between video and audio is almost exactly the same ratio as the difference between the
48000 Hz that avconv automatically chooses as the stream frequency and the
44100 Hz that
pactl list short sources says it's supposed to be.
-ar 44100 flag to avconv makes no difference, the audio is still stretched wrong.