[Bug 747495] gst_base_text_overlay_push_frame() doesn't make memory copy when video buffer's memory is ready only

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747495

--- Comment #7 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
If the GstBuffer is read-only, it will replace the GstBuffer first. If it's
writable, it will simply replace the memory. That's why your decoder need to
track it's memory, instead of it's buffer. A buffer pool is just a cache to try
and avoid allocation GstBuffer object over and over.

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