Merged revision(s) 29572 from opal/branches/v3_12:
Back ported various race condition fixes.
Added VPX_CODEC_UNSUP_BITSTREAM to the list of non-fatal errors for VP8 decoder, sometimes happens accidentally on lost packets.
Fixed merge error
The VP8 decoder is easily confused so if there is a missing packet, it now forgets the all of the frame data collected so far and ignores everything further until it sees an I-Frame.
Fixed VP8 breakage in previous change.