#11314: "alsa" + "v4l2" capturing had audio stuttering with "-c:a copy"
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Reporter: chconnor | Owner: (none)
Type: defect | Status: new
Priority: normal | Component: avdevice
Version: 7.0 | Resolution:
Keywords: alsa v4l2 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 1 |
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Comment (by chconnor):
Capturing with only -c:a pcms16le:
{{{
ffmpeg -report -f alsa -ac 2 -i hw:CARD=Cx231xxAudio,DEV=0 -f v4l2 -i
/dev/video2 -c:a pcm_s16le -c:v rawvideo test-pcms16le.avi
}}}
...generates a working file (with same "non-monotonic" errors).
Capturing with only -ar:
{{{
ffmpeg -report -f alsa -ac 2 -i hw:CARD=Cx231xxAudio,DEV=0 -f v4l2 -i
/dev/video2 -ar 48000 -c:v rawvideo test-ar.avi
}}}
...generates a working file (with same "non-monotonic" errors). But the
resulting audio stream is mp3 (mp3 (mp3float) (U[0][0][0] / 0x0055), 48000
Hz, stereo, fltp, 128 kb/s), and during capture there are additional
errors like this:
[libmp3lame @ 0x61fc116cd800] Queue input is backward in time
Capturing only audio:
{{{
ffmpeg -report -f alsa -ac 2 -i hw:CARD=Cx231xxAudio,DEV=0 -c:a copy
test.wav
}}}
...generates a working .wav file (with same "non-monotonic" errors).
Let me know if you'd like logs or ashowinfo from any of those tests.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11314#comment:4>
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