[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 #8 from Michael Olbrich <m.olbrich at pengutronix.de> 2013-06-04 06:43:33 UTC ---
Created an attachment (id=245980)
 View: https://bugzilla.gnome.org/attachment.cgi?id=245980
 Review: https://bugzilla.gnome.org/review?bug=700285&attachment=245980

improve pixel aspect ratio handling

How about this patch?

Is g_param_spec_string correct for a fraction? All elements that have a 
pixel-aspect-ratio property use it.

VIDIOC_CROPCAP is for both capture and output devices. From the documentation
of the ioctl: "This ioctl must be implemented for video capture or output
devices that support cropping and/or scaling and/or have non-square pixels, and
for overlay devices."

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