[Bug 742385] video/audio encoders/decoders: need API to determine when to copy over GstMetas and when to drop them

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742385
  GStreamer | gst-plugins-base | git

--- Comment #17 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2015-01-08 17:21:19 UTC ---
Take a look at what basetransform does with the tags and transform functions,
IIRC audiofilter/videofilter base classes also do something more on top.

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