[Bug 739196] New: video/x-xvid changed to video/mpeg,mpegversion=4

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739196
  GStreamer | gst-plugins-base | 1.x

           Summary: video/x-xvid changed to video/mpeg,mpegversion=4
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: athoik at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Back to GStreamer 0.10 days xvid was reveived by dvbmediasink[1] as
video/x-xvid. But this is not hapening any more because of the
following commits:

video/x-xvid -> video/mpeg,mpegversion=4
http://cgit.freedesktop.org/gstreamer/gst-plugins-base/commit/?id=ba7d738d9e53b33907c607b8003014f7b5b0cb7f
http://cgit.freedesktop.org/gstreamer/gst-plugins-good/commit/?id=9bf90f47cf789876c91d807bc70866f23875d3a5

Now we are receiving video/mpeg and dvbmediasink uses wrong ioctl
against hardware drivers, causing xvid videos not playing smoothly any
more. (video/mpeg
http://sourceforge.net/p/openpli/gst-plugin-dvbmediasink/ci/gst-1.0/tree/gstdvbvideosink.c#l1297
informs drivers with ioctl 4 and video/x-xvid
http://sourceforge.net/p/openpli/gst-plugin-dvbmediasink/ci/gst-1.0/tree/gstdvbvideosink.c#l1455
informs drivers with ioctl 10)

We tried to get initial fourcc information using the following ways
inside gst_dvbvideosink_set_caps:

const char* fourccc = gst_structure_get_string(structure, "format");
fourcc = GST_STR_FOURCC(value);

GstVideoInfo vinfo;
gst_video_info_from_caps (&vinfo, caps)
fourcc = gst_video_format_to_fourcc (GST_VIDEO_INFO_FORMAT(&vinfo));

But unfortunatelly none of the above returned something in fourcc.

Is there any other way to find that video/mpeg, mpegversion=4 is
actually from video/x-xvid?

Above "issue" initially asked on GStreamer devel mailing list[2] but without
any activity.

[1] http://sourceforge.net/p/openpli/gst-plugin-dvbmediasink/ci/gst-1.0/tree/
[2]
http://lists.freedesktop.org/archives/gstreamer-devel/2014-October/050084.html

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