Merge commit 'ecf442a5'

* commit 'ecf442a5':
  lavf: improve support for AVC-Intra files.

Conflicts:
	libavformat/internal.h
	libavformat/isom.c
	libavformat/mxfdec.c
	libavformat/utils.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>