[Bug 741263] videodecoder: implement caps query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741263
  GStreamer | gst-plugins-base | unspecified

--- Comment #13 from Thiago Sousa Santos <thiagossantos at gmail.com> 2014-12-16 12:38:55 UTC ---
(In reply to comment #12)
> (From update of attachment 292776 [details])
> This seems a bit bogus to me, there is nothing particularly special about
> image/* caps, they should be treated just like video/* caps IMHO. If no
> framerate is specified, 0/1 (variable framerate) should be assumed. The real
> problem here is of course that we otherwise rely on a parser being plugged in
> front, but I still don't think that we should treat image/* special.

For doing that we would need to modify the typefind and it would break cases
like:

multifilesrc ! typefind ! jpegdec ! "image/x-raw, framerate=<something" !
videosink

Unless we make the image decoders ignore the input framerate if it is 0/1 in
favor of what downstream wants. But this would also be special casing.

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