[Bug 758703] v4l2src: gst_v4l2_set_attribute warning messages cause infinite loop with .dot dump

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758703

--- Comment #3 from patcherwork at gmail.com ---
You need a device, or at least a device driver, that doesn't provide one of the
four base controls: Hue, Saturation, Brightness or Contrast. For the base
controls, if one of them is not implemented the behavior should be returning
EINVAL. that causes the warning, which causes the dump, the dump causes a new
ioctl call, which causes a warning, etc.

If you have the required behavior from the driver then a simple pipeline like:

export GST_DEBUG_DUMP_DOT_DIR=/tmp/
gst-launch-1.0 v4l2src device=/dev/video0 ! autovideosink

should be enough to cause the loop

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