[Bug 725860] v4l2src: Fix using v4l2src with Hauppauge HDPVR video capture device

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725860
  GStreamer | gst-plugins-good | 1.2.3

--- Comment #6 from Will Manley <gnome at williammanley.net> 2014-03-07 01:06:36 UTC ---
Ah, the reason is in `gst_v4l2_object_probe_caps_for_format` we see:

  if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G'))
    return gst_caps_new_empty_simple ("video/mpegts");

and so it never even bothers going through the finding out the size dance.  I
guess this sort-of makes sense, maybe the mpeg stream contains multiple video
streams, or they come and go.  Maybe the video stream could change resolution
half way through.

I'll upload a new patch with systemstream=true added to these caps too for good
measure.

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