[Bug 739771] v4l2src allocator fails

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739771
  GStreamer | gst-plugins-good | 1.4.4

--- Comment #12 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> 2014-11-12 14:43:32 UTC ---
I've checked the two traces and differences are:

a) 1.2 allocates 4 buffers while 1.4 allocates 2
b) There is possible difference in buffer.bytesused/length between 1.2 and 1.4.

You can check if a) is the issue by modifying GST_V4L2_MIN_BUFFERS constant to
be 4 (in gst-plugins-good/sys/v4l2/gstv4l2object.h).

For b), you'd have to instrument the code a little more, so we know the values
in set in the v4l2_buffer, maybe you drivers requires a specific field to be
set, and that it was omitted in 1.4.

Providing your custom driver source code would also be key to get some more
help here.

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