[Bug 760270] New: videoparse: add support of padded video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760270

            Bug ID: 760270
           Summary: videoparse: add support of padded video
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: aurelien.zanelli at parrot.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently raw video parser (videoparse) doesn't support video with padding, e.g
custom stride.
So I propose to solve this by adding 4 properties: top,bottom,left and right;
and use them in GstVideoAlignment to adjust video info and so framesize.

Also, in case we have padding, I propose to add video meta to output buffer
using a new vfunc in rawparse 'add_buffer_meta'.

So that we should be able to successfully play a raw video with padding.

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