[Bug 752802] New: avviddec: Sends incorrect CAPS event before the correct one

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752802

            Bug ID: 752802
           Summary: avviddec: Sends incorrect CAPS event before the
                    correct one
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: olivier.crete at ocrete.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

In gst_ffmpegviddec_get_buffer2(), the AVPicture, for some 1080p streams
contains 1088 instead of 1080 as height,  So it negotiates with the wrong
format, and later rengotiates to the right one when a frame is actually
produced.

This is a regression that was introduced by 5b6c8ee8 and it's caught by a
number of gst-validate tests, using sample H1_00094_1920x1280_MTS.

This possibly also needs to be fixed in ffmpeg. Although I wonder if that size
isn't the size that needs to be allocated as a scratch buffer so if it's not
the correct allocation size instead of the final picture size.

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