[Bug 742385] jpegdec plugin removes custom metadata

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742385
  GStreamer | gst-plugins-good | 1.4.5

--- Comment #11 from Chris Maes <chrismaes87 at gmail.com> 2015-01-07 07:21:32 UTC ---
A few months ago I discussed this on the #gstreamer channer on IRC, and the
developers opinion there was that the new GstMeta had been designed so that the
metadata should be retained across all plugins, and that if jpegdec didn't;
this was a bug.

In my case: I have stored jpegs in which I encoded the camera parameters
(exposure time and gain). I wish to replay these in a gstreamer chain. My
version of multifilesrc opens these jpegs and adds these camera parameters as
metadata to the buffers. Then I decode the jpeg and I lose all that metadata;
while they remain important for that buffer. The way the buffer is encoded
doesn't change its camera parameters. 

By the way it is not only jpegenc that preserves the metadata: I didn't test
many of them, but videoconvert preserves them as well (and most plugins that
don't really change the buffer like tee, queue,...)

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