[FFmpeg-user] How to properly record sound when capturing web cam?

[Carl Eugen Hoyos]

2018-05-01 18:04 GMT+02:00, Jean Louis <ffmpeg at rcdrun.com>:

> [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?

Carl Eugen