for i.MX51 there is a Freescale patch for GStreamer that adds support for zero-copy buffers for the codecs:
+ * Module Name: gstmfwbuffer.h
+ * Description: Head file of Freescale accelerated hardware buffer
+ * for gstreamer.
I could not find this patch in the source code drop for i.MX53: L2.6.35_11.09.01_ER_source_bundle
Does this mean the i.MX53 does not require this patch for some reason, whereas i.MX51 does need it?