[Bug 758212] playbin adds the template caps on autoplug-query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758212

--- Comment #20 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Note that autoplug-query already starts to become useful for *parsers* (non-raw
sink, can do bytestream h264 but not avc. parser needs to know that it has to
convert), so limiting it to decoders only doesn't seem like a good solution
either.

OTOH when having a parser we usually know if it's audio or video and could
request pads... but it's not guaranteed that we can find a decoder for that so
maybe we don't have audio/video after all.

Also this might cause problems with subtitles: playbin could have a second
uridecodebin for subtitles, so we will likely configure playsink first without
subtitle pads and only on no-more-pads (of both uridecodebin) configure
subtitles. In theory that should work just fine but it might uncover new bugs
(which should of course be fixed in any case).

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