[Bug 666524] Decklinksink element (from decklink plugin) seems to only work with videotestsrc

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=666524
  GStreamer | gst-plugins-bad | 0.10.22

--- Comment #13 from Joao Paulo Pizani Flor <joaopizani at gmail.com> 2011-12-22 19:26:36 UTC ---
Well, I FINALLY managed to get my simpsons trailer :) to play through the
decklinksink.

That's the gst-launch line that worked fine:

gst-launch-0.10 filesrc location=test/simpsons.mp4 ! decodebin2 ! videoscale !
ffmpegcolorspace ! interlace ! videorate ! decklinksink


My procedure to "find out" this pipeline involved adding the elements, one by
one, and seeing what decklinksink was complaining about in a GST_DEBUG=4 log.
In my last "rational" attempt, I tried to use:

! videorate ! videoscale ! ffmpegcolorspace ! interlace !

to no avail. Then I decided to put videorate at the end of the pipeline "just
for fun", and it worked! But, until now, I couldn't understand how changing the
order of elements helped in this case? Can please some enlightened soul explain
this to me?

I'm planning to develop applications using GStreamer and decklinksink, so... Is
there some more "pragmatic" way to find out about where to insert elements
rather than trial and error?

Last but not least, perhaps you guys can consider this bug as CLOSED now :)

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