[Bug 696770] Memory leak when processing h.264 field pictures

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=696770
  GStreamer | gst-libav | 1.0.5

--- Comment #9 from Michael Rubinstein <mrubinstein at weather.com> 2013-06-04 17:10:22 UTC ---
I'm attaching my temporary fix.  It's a diff from 1.0.7.  However, I edited the
diff to remove unrelated changes.

The basic approach is to detect when the decoder processes a frame without
allocating an output buffer.  I set a flag when the buffer is allocated and
check it after the decode call.

Before releasing a frame, I, change the reference count.

I don't think my fix ia really correct, but it does handle the normal case. 
Hopefully, it helps describe the problem.

It would be nice to combine the two field pictures into a single frame at an
earlier stage, but the h.264 deccoder would need to handle it as well.

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