[Bug 752962] v4l2videodec: Add resolution change support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752962

--- Comment #7 from kevin <kevinbing.song at gmail.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #6)
> (In reply to kevin from comment #4)
> > What's mean of stream change? Do you mean video compressed format changed?
> > such as H264 changed to MPEG4? If so, it is out range of decoder, it should
> > be decoderbin's job. As maybe need load another element to do video decoder.
> 
> I mean the header changes (for the AVC case, and any format that have the
> header in the caps as codec_data).

For video decoder element input caps change, seems should be handled in
gstvideodecoder base. Is it ok to file another ticket to implement?

This ticket only handle video decoder output change without set_caps (). Such
as H264 in byte-stream format, the header change detect by video decoder.

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