[Bug 762546] New: Stride information is missing in buffers from vaapipostproc

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762546

            Bug ID: 762546
           Summary: Stride information is missing in buffers from
                    vaapipostproc
    Classification: Platform
           Product: GStreamer
           Version: 1.6.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: scheuermann at barco.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

The buffers received from appsink don't have the correct stride information,
when this buffer was processed by vaapipostproc.
The pipeline looks like this:
vaapidecode ! vaapipostproc ! appsink

After getting the buffer from appsink I get the information about the video
with

buffer = gst_sample_get_buffer(_sample);
caps = gst_sample_get_caps(_sample);
gst_video_frame_map(&frame, &vinfo, buffer, GST_MAP_READ);

The strides should be in
vinfo.stride[0]
vinfo.stride[1]
...

But these strides don't match.
For BGRx e.g. a line is rounded up to a multiple of 64 pixels,
but this is not reflected in the stride.

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