[Bug 706340] New: It might make sense to implement the "transform_meta" virtual method in videofilter.

[GStreamer (bugzilla.gnome.org)]

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

           Summary: It might make sense to implement the "transform_meta"
                    virtual method in videofilter.
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mathieu.duponchelle at epitech.eu
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


We've got a problem in GES with buffer metas not being copied when they go
through a filter (e.g. agingtv) A fix is to implement transform_meta and return
TRUE in each and every one of the effects we might use, but I wonder if it
might not make more sense to do so directly in videofilter ?

IRC :

<__tim> Mathieu_Du, any metas in particular? it's a bit tricky to generically
copy metas if you don't know what they represent
<Mathieu_Du> Hm well this is a meta used to carry alpha information from our
track elements to the global videomixer
<Mathieu_Du> That is internal to ges
__tim> I'm not sure if you can just assume that they will still apply to the
new transformed buffer
<__tim> e.g imagine a meta marking a face, now some effects warps the image,
and the meta now marks .. something
<Mathieu_Du> Well that should be the role of the transform_func of the meta to
determine that may'be ?
<Mathieu_Du> I don't really know I have to say :)
<Mathieu_Du> I see the problem now though
<Mathieu_Du> The fact still remains that we *need* these meta to get copied :)

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