Fixes sporadic segfaults with some filters.

A duration value is undefined when is 0, take into consideration this
fact when printing optional fields.

The function was introduced in 4d6a8a2b and is not used anymore
outside avfilter.c.

This avoids to pollute the public API with an apparently unnecessary
function. The function was introduced a few days ago, so removing it from
the public API should do no much harm.

Include missing required internal headers.

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

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

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

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

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

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

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

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

Currently, we don't set the duration on the packet of a newly
encoded subtitle. This information may be required by the
muxer.
Signed-off-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

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

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

Fixes yesterday's merge of Kostya's fix for ticket #409.

This fixes terminal messup in case of crashes (like in make fate)
Reviewed-by: François Revol <revol@free.fr>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* qatar/master:
  vorbis: Validate that the floor 1 X values contain no duplicates.
  avprobe: Identify codec probe failures rather than calling them unsupported codecs.
  avformat: Probe codecs at score 0 on buffer exhaustion conditions.
  avformat: Factorize codec probing.
  Indeo Audio decoder
  imc: make IMDCT support stereo output
  imc: move channel-specific data into separate context
  lavfi: remove request/poll and drawing functions from public API on next bump
  lavfi: make avfilter_insert_pad and pals private on next bump.
  lavfi: make formats API private on next bump.
  avplay: use buffersrc instead of custom input filter.
  avtools: move buffer management code from avconv to cmdutils.
  avconv: don't use InputStream in the buffer management code.
  avconv: fix exiting when max frames is reached.
  mpc8: fix maximum bands handling
  aacdec: Turn PS off when switching to stereo and turn it to implicit when switching to mono.

Conflicts:
	Changelog
	cmdutils.h
	ffmpeg.c
	ffplay.c
	ffprobe.c
	libavcodec/avcodec.h
	libavcodec/mpc8.c
	libavcodec/v210dec.h
	libavcodec/version.h
	libavcodec/vorbisdec.c
	libavfilter/avfilter.c
	libavfilter/avfilter.h
	libavfilter/buffersrc.c
	libavfilter/formats.c
	libavfilter/src_movie.c
	libavfilter/vf_aspect.c
	libavfilter/vf_blackframe.c
	libavfilter/vf_boxblur.c
	libavfilter/vf_crop.c
	libavfilter/vf_cropdetect.c
	libavfilter/vf_delogo.c
	libavfilter/vf_drawbox.c
	libavfilter/vf_drawtext.c
	libavfilter/vf_fade.c
	libavfilter/vf_fifo.c
	libavfilter/vf_format.c
	libavfilter/vf_frei0r.c
	libavfilter/vf_gradfun.c
	libavfilter/vf_hflip.c
	libavfilter/vf_hqdn3d.c
	libavfilter/vf_libopencv.c
	libavfilter/vf_lut.c
	libavfilter/vf_overlay.c
	libavfilter/vf_pad.c
	libavfilter/vf_scale.c
	libavfilter/vf_select.c
	libavfilter/vf_showinfo.c
	libavfilter/vf_transpose.c
	libavfilter/vf_unsharp.c
	libavfilter/vf_yadif.c
	libavfilter/vsrc_color.c
	libavfilter/vsrc_testsrc.c
	libavformat/utils.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

They were discarded in 0f0f3bd1.

Duplicate values in this vector are explicitly banned by the Vorbis I spec
and cause divide-by-zero crashes later on.

The new location is more suited, as it is where the lavfi/lavc glue is
defined.

This will be useful for Indeo Audio decoder which is almost the same
but supports stereo.

This will be useful for Indeo Audio decoder which is almost the same
but supports stereo.

I changed the *_set_common_* functions to only set unset formats, then
added a wrapper that calls them after the filters query_formats.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

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

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

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

This is a temporary workaround for amerge,
until format renegociation is implemented.

Should fix trac ticket #1400.