[FFmpeg-devel] [PATCH] lavd/v4l2: silence libv4l2 logging

[Giorgio Vazzana]

Hello,

a user pointed out in ticket #1570 that when ffmpeg is compiled with
--enable-lib4vl2 the terminal gets spammed with this message:

libv4l2: error dequeuing buf: Resource temporarily unavailable

This is because libv4l2 opens the device in non-blocking mode, so the
ioctl VIDIOC_DQBUF returns EINVAL and that message gets displayed.
In /usr/include/libv4l2.h I can read:

/* Point this to a FILE opened for writing when you want to log error and
   status messages to a file, when NULL errors will get send to stderr */
LIBV4L_PUBLIC extern FILE *v4l2_log_file;

So I suggest the attached patch to silence libv4l2 logging, since
ffmpeg uses its own error messages for pretty much all errors.

Giorgio Vazzana
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