[Bug 700285] v4l2: set pixel-aspect-ratio for capture devices only

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=700285
  GStreamer | gst-plugins-good | git

--- Comment #3 from Michael Olbrich <m.olbrich at pengutronix.de> 2013-05-29 10:04:56 UTC ---
Well, there are some ioctls to define a output rectangle. However, I'm not
really sure how and when they are supposed to be used, and the implementations
are, as far as I can tell not really consistent.
There are newer ones, but I'm not sure if there are actually used anywhere.
Also, if you consider TV outputs, I'm not sure if assuming that the real pixel
aspect ratio is 1/1 makes sense.

Anyways, I don't really have a strong opinion either way. I just want to play
strange video files with a pixel aspect ration other than 1/1 on embedded
hardware, where scaling the video is just not acceptable. If there is any other
way to ignore it, then I'm happy with that too.

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