[Bug 706340] videofilter: it might make sense to implement the "transform_meta" virtual method

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=706340
  GStreamer | gst-plugins-base | git

--- Comment #2 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2013-08-20 08:42:26 UTC ---
But then you'll always drop custom metas that an element doesn't know about,
that's not really right either and makes metas much less useful.

I think there should be some kind of hint or flag that indicates that the meta
applies to the buffer and should be maintained even if the content is
transformed (but the chunking/timing remains unchanged). Likewise there should
be a hint that the meta is related to the memory, etc. There might already be
something somewhere, I remember having had this discussion before.

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