If st is NULL, it means no 'fmt ' tag is found, but 'data' tag (which
needs a previous 'fmt ' tag to be parsed correctly and st initialized)
check will make sure st is never dereferenced in that case.

Fixes ticket #425.

	commit 630902a1
	Author: Anton Khirnov <anton@khirnov.net>
	Date:   Wed Jul 6 08:49:07 2011 +0200
	avconv: factor out initializing input streams.

These caused scrambled error messages to be printed and
floating point exceptions.
For example when there was no decoder available for a
stream
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This should make no functional difference.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Found-by: ubitux
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

url_feof() is usefull when a file is appended to
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* qatar/master: (31 commits)
  libx264: set default thread count to 0 (auto)
  lavc: cosmetics, group deprecated codec flags
  mpeg12: add 'scan_offset' private option.
  h263/p encoder: add 'structured_slices' private option.
  h263/p encoder: add 'obmc' private option.
  h263p encoder: add 'aiv' private option.
  h263p encoder: add 'umv' private option.
  mpeg12enc/mpeg4videoenc: add 'alternate_scan' private option.
  mjpegdec: add 'extern_huff' private option.
  mpeg4enc: add 'data_partitioning' private option.
  snow: add 'memc_only' private option.
  libx264: add 'mbtree' private option.
  libx264: add 'psy' private option.
  libmp3lame: add 'reservoir' private option.
  mpeg2enc: add 'non_linear_quant' private option
  mpeg12enc: add drop_frame_timecode private option.
  mpeg12enc: add intra_vlc private option.
  VC1: Support dynamic dimension changes
  mjpeg: treat external huffman table setup failure as codec init failure if external huffman table use requested
  lavc: deprecate CODEC_FLAG2_BRDO
  ...

Conflicts:
	avconv.c
	libavcodec/libmp3lame.c
	libavcodec/libx264.c
	libavcodec/mjpegdec.c
	libavcodec/mpeg12enc.c
	libavcodec/mpegvideo.h
	libavcodec/vc1.c
	libavcodec/vc1dec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Deprecate CODEC_FLAG_SVCD_SCAN_OFFSET

Deprecate CODEC_FLAG_H263P_SLICE_STRUCT

Deprecate CODEC_FLAG_OBMC

Deprecate CODEC_FLAG_H263P_AIV

Deprecate CODEC_FLAG_H263P_UMV

Deprecate CODEC_FLAG_ALT_SCAN

Deprecate CODEC_FLAG_EXTERN_HUFF

Deprecate CODEC_FLAG_PART

Deprecate CODEC_FLAG2_MEMC_ONLY

Deprecate CODEC_FLAG2_MBTREE

Deprecate CODEC_FLAG2_PSY

Deprecate CODEC_FLAG2_BIT_RESERVOIR

Deprecate CODEC_FLAG2_NON_LINEAR_QUANT

Deprecate CODEC_FLAG2_DROP_FRAME_TIMECODE

Deprecate CODEC_FLAG2_INTRA_VLC.

Fixes SA00072, SA00073, SA10150, SA10151, Issue2076

Improves SA10153
Signed-off-by: Anton Khirnov <anton@khirnov.net>

mjpeg: treat external huffman table setup failure as codec init failure if external huffman table use requested
Signed-off-by: Anton Khirnov <anton@khirnov.net>

It's been unused for the last 3 years.

Deprecate CODEC_FLAG2_AUD.

Deprecate CODEC_FLAG2_FASTPSKIP.