[Bug 742385] jpegdec plugin removes custom metadata

Tue Jan 6 06:57:01 PST 2015

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

--- Comment #10 from Luis de Bethencourt <luis at debethencourt.com> 2015-01-06 14:56:57 UTC ---
Sorry this issue of yours has evolved to this level of discussion about
GstMetas. From the resource you mention, "With the GstMeta system you can add
arbitrary structures on buffers. These structures describe extra properties of
the buffer such as cropping, stride, region of interest etc." My understanding
of what this means is that GstMetas are meant to be a solution to pass extra
information related to the buffer that the elements handling this buffer
(output/input) should know about.

I think what Tim is trying to say, using your example as a basis, is that
jpegenc wasn't intended to copy over metadata of filesrc's video/x-raw buffer
into the image/jpeg buffer. Since this wasn't designed to be and is happening
by accident. It can't be expected to happen in other elements, or for that
matter, probably not permanently in jpegenc.

Can you give me an example of when it would be a benefitial feature to copy the
metadata from one GstBuffer in the input side of an element to the GstBuffer
generated on the other side?

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