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

[FFmpeg]

#1570: libv4l2: error dequeuing buf: Resource temporarily unavailable
-------------------------------------+-------------------------------------
             Reporter:  llarevo      |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avdevice
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
  video4linux, video4linux2,         |  Reproduced by developer:  0
  v4l2.c, regression, capture,       |
  analog, tv                         |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by llarevo):

 > That makes me wonder if one of your parameter isn't wrong: you specify
 -r 25 which might be not supported by your card. Can you make some tests
 with something simple such as:
 >
 > {{{
 > ./ffplay -f v4l2 -i /dev/video0
 > }}}
 >
 > to see if it doesn't show anything? (for old version you might need to
 change v4l2 into video4linux2)

 ffplay doesn't show anything and has to be killed by strg+c:
 {{{
 /usr/local/bin/ffplay -f v4l2 -i /dev/video0
 ffplay version 0.11.1 Copyright (c) 2003-2012 the FFmpeg developers
   built on Jul 29 2012 15:57:16 with gcc 4.7.0 20120507 (Red Hat 4.7.0-5)
   configuration: --prefix=/usr/local --libdir=/usr/local/lib64
 --shlibdir=/usr/local/lib64 --enable-nonfree --enable-gpl --enable-libfaac
 --enable-libgsm --enable-libmp3lame --enable-libtheora --enable-libxvid
 --disable-asm --disable-crystalhd
   libavutil      51. 54.100 / 51. 54.100
   libavcodec     54. 23.100 / 54. 23.100
   libavformat    54.  6.100 / 54.  6.100
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     2. 77.100 /  2. 77.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 ^C
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1570#comment:9>
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