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Audio out of sync with video
Issue:
- Audio playback doesn't begin at the start of video playback (out of sync)
Observations:
- If audio is already playing before the capture starts, audio stays sync'd up with video
Alsa Device Index may cause Input/Output error from ffmpeg command
If ADI (Alsa Device Index) in the capture script is not set to the proper device index, ffmpeg command will fail with an "Input/Output" error. The proper ADI may vary by machine/vm.
You can find the alsa device index using pacmd list-sources
and looking for the device which contains ".monitor" at the end of the name, ie:
$ pacmd list-sources
2 source(s) available.
index: 1
name: <alsa_output.pci-0000_00_04.0.analog-stereo.monitor>
...
The correct device index value should be placed here
Fix incorrect timestamps in output file
Sample warning in ffmpeg output:
[mp4 @ 0x55929294b340] Non-monotonous DTS in output stream 0:1; previous: 402395, current: 399868; changing to 402396. This may result in incorrect timestamps in the output file.
This may be causing the audio/video to fall out of sync and cause stuttering in the output file/stream
pulseaudio fails due to permission issues when running inside a docker container
Close browser window gracefully
In the capture.sh script, kill
causes the browser to restart in safe mode in subsequent runs
See: https://github.com/Seneca-CDOT/bigbluebutton/blob/capture-meeting/labs/x11/capture.sh#L8
Suggestion:
Utilize wmctrl
to gracefully close the browser window
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