[FFmpeg-trac] #1570(avdevice:closed): libv4l2: error dequeuing buf: Resource temporarily unavailable

[FFmpeg]

#1570: libv4l2: error dequeuing buf: Resource temporarily unavailable
-------------------------------------+-------------------------------------
             Reporter:  llarevo      |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  important    |                Component:  avdevice
              Version:  git-master   |               Resolution:  fixed
             Keywords:  v4l2         |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  1            |
-------------------------------------+-------------------------------------

Comment (by llarevo):

 '''ffmpeg compiled without --enable-lib4vl2: OK
 '''
 ffmpeg -loglevel debug -f v4l2 -video_size vga -framerate 25 -i
 /dev/video0 out-vga-2M-5min.mpg
 and
 ffmpeg -loglevel debug -f v4l2 -s vga -framerate 25 -i /dev/video0 out-
 vga-2M-5min.mpg

 All are working fine now :-)

 '''ffmpeg compiled with --enable-lib4vl2: Still faulty
 '''
 But there is still a problem using a ffmpeg compiled with --enable-
 libv4l2. Lots of errors are beeing generated while capturing:

 {{{
 ffmpeg -f video4linux2 -i /dev/video0 -flags +ilme+ildct -aspect 4/3
 -target pal-dvd -y test.mpeg
 ffmpeg version N-50436-g1d5b35c Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Mar  2 2013 19:45:45 with gcc 4.7.2 (GCC) 20121109 (Red Hat
 4.7.2-8)
   configuration: --prefix=/usr/local --enable-ffplay --enable-libv4l2
   libavutil      52. 17.103 / 52. 17.103
   libavcodec     54. 92.100 / 54. 92.100
   libavformat    54. 63.102 / 54. 63.102
   libavdevice    54.  3.103 / 54.  3.103
   libavfilter     3. 41.100 /  3. 41.100
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
 ...(some lines I don't know)...
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily
 unavailablerate=7253.3kbits/s
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily
 unavailablerate=6826.7kbits/s
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 libv4l2: error dequeuing buf: Resource temporarily unavailable
 (...)
 }}}
 But the resulting video seems OK after a very quick view.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1570#comment:20>
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