[Bug 732621] New: video-info: wrong stride with NV12 buffers

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732621
  GStreamer | gst-plugins-base | 1.2.0

           Summary: video-info: wrong stride with NV12 buffers
    Classification: Platform
           Product: GStreamer
           Version: 1.2.0
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: fabien.dessenne at st.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


In video-info.c, the fill_planes() function align the strides value to multiple
of 4:
  info->stride[0] = GST_ROUND_UP_4 (width);
  info->stride[1] = info->stride[0];

This is wrong, the stride (as well as the width) shall be rounded to a multiple
of 2. Indeed the NV12 pixel format uses 2x2 sub-sampling (details:
http://www.fourcc.org/yuv.php#NV12), and as a consequence it is expected that
the dimensions of a NV12 buffer are multiple of 2.

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