[Bug 742918] v4l2: Add decoder and converter element with RW device property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742918

--- Comment #25 from Michael Tretter <m.tretter at pengutronix.de> ---
Created attachment 353246
  --> https://bugzilla.gnome.org/attachment.cgi?id=353246&action=edit
v4l2videoenc: verify outcaps with peer before setting the format

If the subclass specifies multiple supported codecs or if the
v4l2videoenc element is directly instantiated, the outcaps are not
fixated and can contain codecs that are not supported by the downstream
element.

Ask the peer for the available caps and fixate them before setting the
format.

This patch is especially required for the generic encoder element.

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