[Bug 645385] Transitions act randomly depending on the video codec in use.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=645385
  GStreamer | gst-editing-services | git

--- Comment #3 from Thibault Saunier <tsaunier at gnome.org> 2011-04-19 12:33:17 UTC ---
The transition is composed of a bin which has 2 gohstpads linked to
ffmpegvideocolorspace elements which are themselves linked to the videomixer
and another ffmpecolospace conversion (used as a ghostpad) after the videomixer
src. It could be drawn as such (for the crossfade only):

   ! ffmpegcolorspace ! videomixer(2) name=mix ! ffmpegcolorspace (ghostpad) !
ffmpegcolorspace ! mix. !

The problem is that we need to make sure the 2 videos have the same size
(scaling) while being mixed. Introducing a videoscale between the sources and
the mixer (sinks) with hard-coded Caps (height/width) to be sure the video have
the same size make effects working properly.

But, this is not a solution, and instead, we could:
    * have a fixed size for all the sources/track in a timeline, which I think
for some reason has been preferred not to be done. 
    * get the caps of the 2 incoming sources and make the scaling equal to the
size of the smallest video coming in.

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