Allow to show the supported options in the ffmpeg -h full output.

Sample from ticket #1216 does not use any compression but bitstream
claims it is. Reference decoder decodes sample just fine.

Fixes #1216.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Fixes CID603186
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Reviewed-by: Michael Bradshaw

This ensure that decode_plane() mmx code like AV_COPY64()
does not interfere with possible float instructions in
release_buffer/get_buffer.

Found-by: Carl Eugen Hoyos
Signed-off-by: Paul B Mahol <onemda@gmail.com>

Fixes CID733838
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

The option chapter is based on the avoptions_codec.texi auto-generated
file.

The file name can be set by setting the FFREPORT environment
variable to "file=something".

Fix trac ticket #1823.

This function does the low-level work of av_opt_set_from_string()
but can be used when there is no option context or when a generic
handling of unknown keys is needed.

av_opt_set_from_string() is changed to make use of it.

It removes the hardcoded limit on the key size without making
the code much more complex, and it makes for a more versatile API.

This reverts commit 841bf0ef.
This does not fully work as the file is used before the filename is parsed
so not all information is written in the specified file.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Fixes CID703674
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes CID741417
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes CID741418
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Slightly simplify readability, since the initial check is unnecessary.

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

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

The help text tells what the option does, not what the accepted parameter
is. Thus convert strings of the kind:

Bikeshed Color
to
set bikeshed color

It does not make sense to set a negative bitrate.

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

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

Wording suggested by Stefano Sabatini, should have been
merged with the previous commit.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

* qatar/master:
  doc: add apidoc target for doxygen API documentation
  matroskadec: do not use avpacket internals

Conflicts:
	doc/Makefile
	libavformat/matroskadec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '9221efef':
  lavf: fix av_interleaved_write_frame() doxy.
  lavf: clarify the lifetime of demuxed packets.
  avconv: do not free muxed packet on streamcopy.
  crc: move doxy to the header
  vf_drawtext: do not use deprecated av_tree_node_size
  x86: Refactor PSWAPD fallback implementations and port to cpuflags
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '9a07c133':
  parser: Move Doxygen documentation to the header files
  PGS subtitles: Expose forced flag
  x86: PMINUB: port to cpuflags

Conflicts:
	libavcodec/avcodec.h
	libavcodec/pgssubdec.c
	libavcodec/version.h
	libavcodec/x86/ac3dsp.asm
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fix commit c9eaa98a.
+10l.

* commit '9ce02e14':
  x86: ac3dsp: port to cpuflags
  x86util: Add cpuflags_mmxext alias for cpuflags_mmx2
  x86inc: Only define program_name if the macro is unset

Conflicts:
	libavcodec/x86/ac3dsp.asm
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Simplify, increase robustness in case a new sample format is added.

Improve consistency.