[FFmpeg-trac] #4320(undetermined:new): Incorrect work with SoX pipe
FFmpeg
trac at avcodec.org
Sat Mar 19 07:26:56 CET 2016
#4320: Incorrect work with SoX pipe
-------------------------------------+-------------------------------------
Reporter: Ilya87 | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
-------------------------------------+-------------------------------------
Comment (by Ilya87):
Tried with the ffmpeg 3.0. In the beginning I thought this problem is
connected somehow with thread_que_size, but even the command
{{{
ffmpeg -thread_queue_size 512 -y -framerate 30 -video_size 1280x720 -f
x11grab -i :0.0+0,0 -f alsa -i looprec -c:v libx264 -preset veryfast
-maxrate 3500k -b:v 3000k -threads 2 -bufsize 3968k -vf "format=yuv420p"
-g 60 -c:a aac -b:a 160k 123.mkv
}}}
still shows warning message
{{{
[alsa @ 0x564cc04019c0] Thread message queue blocking; consider raising
the thread_queue_size option (current value: 8)
}}}
But I see No framedrop and capture fps is 30. And audio and video is
synced.
Recording system sound with ffmpeg and mic using sox leads to the
audio/video desynchronization approximately 0.8 sec. Video capture speed
became 30 fps from 745 (3 x264 threads) to 1145 (1 x264 thread) captured
frame, 28-29 fps before.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/4320#comment:2>
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