[FFmpeg-trac] #1560(avdevice:new): v4l2 device won't open after opening/closing it 16 times

[FFmpeg]

#1560: v4l2 device won't open after opening/closing it 16 times
----------------------------------+--------------------------------------
             Reporter:  tmatth    |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avdevice  |                  Version:  git-master
             Keywords:  v4l2      |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:

 In the attached case, I open and close a v4l2 device (/dev/video0) 17
 times. On the 17th time, it fails to open with the following errors:

 libv4l2: error attempting to open more then 16 video devices
 [video4linux2,v4l2 @ 0x1f6a5c0] ioctl(VIDIOC_QUERYCAP): Bad file
 descriptor
 Could not open input "/dev/video0"

 How to reproduce:
 Build and run the attached test case with a v4l2 device connected.

 I'm using the ffmpeg git master branch:

 ffmpeg version N-42636-ga8d8e86 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jul 19 2012 17:32:59 with gcc 4.7.0 (GCC) 20120507 (Red Hat
 4.7.0-5)
   configuration: --prefix=/opt/ --enable-bzlib --enable-gnutls --enable-
 libv4l2 --enable-libx264 --enable-x11grab --enable-postproc --enable-
 pthreads --disable-static --enable-shared --enable-gpl --disable-debug
 --disable-stripping --enable-pic

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1560>
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