Merge remote-tracking branch 'qatar/master'

* qatar/master: (27 commits)
  cmdutils: use new avcodec_is_decoder/encoder() functions.
  lavc: make codec_is_decoder/encoder() public.
  lavc: deprecate AVCodecContext.sub_id.
  libcdio: add a forgotten AVClass to the private context.
  swscale: remove "cpu flags" from -sws_flags description.
  proresenc: give user a possibility to alter some encoding parameters
  vorbisenc: add output buffer overwrite protection
  libopencore-amrnbenc: fix end-of-stream handling
  ra144enc: fix end-of-stream handling
  nellymoserenc: zero any leftover packet bytes
  nellymoserenc: use proper MDCT overlap delay
  qpeg: Use bytestream2 functions to prevent buffer overreads.
  swscale: make %rep unconditional.
  vp8: convert simple loopfilter x86 assembly to use named arguments.
  vp8: convert idct x86 assembly to use named arguments.
  vp8: convert mc x86 assembly to use named arguments.
  vp8: convert loopfilter x86 assembly to use cpuflags().
  vp8: convert idct/mc x86 assembly to use cpuflags().
  swscale: remove now unnecessary hack.
  x86inc: don't "bake" stack_offset in named arguments.
  ...

Conflicts:
	cmdutils.c
	doc/APIchanges
	libavcodec/mpeg12.c
	libavcodec/options.c
	libavcodec/qpeg.c
	libavcodec/utils.c
	libavcodec/version.h
	libavdevice/libcdio.c
	tests/lavf-regression.sh

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

libavcodec/pthread.c

@@ -416,7 +416,6 @@ static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src,
     int err = 0;
 
     if (dst != src) {
-        dst->sub_id    = src->sub_id;
         dst->time_base = src->time_base;
         dst->width     = src->width;
         dst->height    = src->height;