[Bug 757254] New: GstMeta not copied because buffer is not writable

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757254

            Bug ID: 757254
           Summary: GstMeta not copied because buffer is not writable
    Classification: Platform
           Product: GStreamer
           Version: 1.6.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: pietro_bonfa at yahoo.it
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 314325
  --> https://bugzilla.gnome.org/attachment.cgi?id=314325&action=edit
Test case showing that meta are not propagated.

Custom metadata API cannot be copied by 

myapi_meta_transform (GstBuffer * transbuf, GstMeta * meta,
    GstBuffer * buffer, GQuark type, gpointer data)

with some pipelines because transbuf is not writable.

Citing this message:
http://lists.freedesktop.org/archives/gstreamer-devel/2015-October/055188.html

"It's a bug in videodecoder, the same bug probably also exists elsewhere."

Testcase attached.

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