On Tue, May 01, 2018 at 06:14:15PM +0200, Carl Eugen Hoyos wrote: > 2018-05-01 18:04 GMT+02:00, Jean Louis <[email protected]>: > > > [video4linux2,v4l2 @ 0x2590a40] Detected monotonic timestamps, converting > > Input #0, video4linux2,v4l2, from '/dev/video0': > > Duration: N/A, start: 1525190574.860860 > > > Input #1, alsa, from 'default': > > Duration: N/A, start: 1525190574.924269 > > This is correct now, as said it could not work before. > (If it did work for some encoders, this indicates a > bug there.) > > > [alsa @ 0x2592fc0] Thread message queue blocking; > > consider raising the thread_queue_size option (current value: 100) > > [video4linux2,v4l2 @ 0x2590a40] Thread message queue blocking; > > consider raising the thread_queue_size option (current value: 8) > > You should try to fix this. > > Are you sure your system is fast enough for vp9 realtime > encoding?
This is Thinkpad L430, pretty fast machine. Should be working. I have tried this one: ffmpeg -y -f v4l2 -thread_queue_size 800 -video_size 800x448 -i /dev/video0 -f alsa -thread_queue_size 10000 -ac 1 -ar 14400 -i default -q:v 5 output.webm; mplayer output.webm; ls -l output.webm and that one works without warnings of the thread_queue_size, maybe it would work with less of it, but with 3000 it was still warning. Yet, the result that sound is interrupted in WEBM and MP4 and MKV formats is still same. If the video is 15 seconds, 3 seconds before the sound is off, and I could see on screen that only 10+ seconds were recorded. OGV format is working well. MPG format is working well but not with less than 15 fps, which is unrelated, so I can record it with 640x480 without problems it has more fps. If video is 7 seconds, sound is off about on 5th second. Jean _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
