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

FFmpeg trac at avcodec.org
Sat Jul 28 14:48:22 CEST 2012

#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):

 I don't know how to do this. I tried:
 cd ffmpeg
 git checkout 70f7736
 gedit hack.patch
 I copied your hack above and saved it in the file "hack.patch". After
 that, I did
 patch -p0 < hack.patch
 can't find file to patch at input line 5
 Perhaps you used the wrong -p or --strip option?
 The text leading up to this was:
 |diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
 |index 2808e13..0acd3da 100644
 |--- a/libavdevice/v4l2.c
 |+++ b/libavdevice/v4l2.c
 File to patch: ^C
 Then I tried
 patch -p1 < hack.patch
 patching file libavdevice/v4l2.c
 Hunk #1 FAILED at 694.
 1 out of 1 hunk FAILED -- saving rejects to file libavdevice/v4l2.c.rej

 Sorry - I have not really a clue what I'm doing there. I don't find the
 if (framerate_q.num && framerate_q.den) {
 in the file "libavdevice/v4l2.c"

 Can you give me a short advice how to "try this hack with an upstream
 FFmpeg"? What means upstream? Shall I try the hack with the most recent
 version? How can I get it with the git checkout command? If so, shall I
 configure with "--enable-libv4l2" or without?

 Sorry, but this is the first time I deal with source code, so any advice
 is very appreciated.

 Thanks a lot.

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1570#comment:3>
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