[Bug 797205] New: glimagesink last sample orientation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797205

            Bug ID: 797205
           Summary: glimagesink last sample orientation
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lists at svrinformatica.it
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 373762
  --> https://bugzilla.gnome.org/attachment.cgi?id=373762&action=edit
test case

please take a look at the attached test app, 

basically glvideoflip ! glimagesink displays the right image but if video flip
orientation does not change the image size (for example
GST_VIDEO_ORIENTATION_180) the snapshot taken from last-sample has a wrong
orientation.

I discussed about this issue with ystreey00 today and it seems there isn't a
simple solution

"""
it's one of those edge cases that I'm not sure exactly where to fix it
"""

I added a workaround in my application (a videoflip element in the snapshot
pipeline) but since xvimagesink (and probably d3dvideosink too) works as
expected this behaviour should be at least documented. Thanks!

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