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

FFmpeg trac at avcodec.org
Mon Mar 4 15:51:29 CET 2013

#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 holden):


 for the issue of ffmpeg compiled with --enable-lib4vl2 I will try to look
 into that, although I am a bit busy these days so I can only work on it on
 weekends :(

 For the audio issue, I'm sure it should work, it must be some settings.
 Sadly all the transmissions are in dvb-t now here in Italy, so I cannot
 test with analog TV.
 I'd suggest you to try this: acquire only video with ffmpeg and see if you
 can hear something by running in another terminal:
 arecord -D hw:SAA7134 -f cd | aplay
 while you do that, open alsamixer and play around, in particular make sure
 you test all the capture inputs (Line 1, Line 2 and Video). If that works,
 ffmpeg should work too. Anyway this is probably another issue, so I'd
 kindly ask you to please open a new ticket.

 ps. I've noticed with my card that if I set capture on Video, and run the
 command above, I see in alsamixer that something changes it back to Line
 2. Once I switch to Video again I can hear the typical noise of untuned TV

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1570#comment:22>
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