[Bug 791918] New: Add KLV meta and add support for it in matroska mux/demux

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791918

            Bug ID: 791918
           Summary: Add KLV meta and add support for it in matroska
                    mux/demux
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: t.i.m at zen.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
        Depends on: 791415
     GNOME version: ---

Created attachment 365925
  --> https://bugzilla.gnome.org/attachment.cgi?id=365925&action=edit
buffer: add gst_buffer_get_n_meta() convenience function (core)

This adds a GstKLVMeta to libgsttag, which allows attaching arbitrary metadata
in KLV format to buffers.

Plus patches to read/write those to/from Matroska as BLOCKADDITIONALs.

And an extra patch to v4l2src for testing which is not for merging.

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