ffmpeg looks for both .ffpreset and .avpreset files depending on whether the
-[avsf]pre or -pre option is used. Added two sections for each type of preset
including the rules according to which files are searched.

(Notably, the lookup order is swapped for avpreset files, because it first
looks for <codec>_<arg>.avpreset and then for <arg>.avpreset.)

This removes the section explaining -pre only, which was under "Examples",
where it did not really make sense.

Signed-off-by: Werner Robitza <werner.robitza@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Simon Thelen <ffmpeg-dev@c-14.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Replace "frames to record" with "frames to output". The "to record"
makes it seem like an input option, or that it would capture the frames
instead of outputting them.

Reviewed-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Lou Logan <lou@lrcd.com>

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

Signed-off-by: Lou Logan <lou@lrcd.com>

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

Also lowercase "options" in "Advanced Video Options" for consistency.

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

Signed-off-by: Lou Logan <lou@lrcd.com>

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

These charts in man page are currently destroyed.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Avoid doc duplication and desynching.

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

Change -r to -framerate, but either will work.
Change -s to -video_size, but either will work.

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

The first sentence of each of the modified man pages are worded a bit
awkwardly. These minor copy-edits should make them clearer.

Signed-off-by: Bryce Harrington <b.harrington@samsung.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

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

Force re-generation of the manuals when an included file is modified.
The current dependency generation system is enable to track nested
inclusions.

The drawback is that the files will be generated even when there is no
strict need (for example if filters.texi is modified, ffmpeg.1 is
rebuilt), thus it trades a false negative with a false positive.

In particular, add documentation configuration system, through the
doc/config.texi file.

Fix trac issue #2374.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

We used to use 'filtergraph' or 'filter graph' randomly.

'filtergraph' was chosen due to having 57 occurrences in
the documentation, whereas 'filter graph' had only 19.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

We used to use 'framerate' or 'frame rate' randomly.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Also extends documentation for timestamp related ffmpeg options, in order
to make more apparent the fact that muxer processing may change the
timestamps values.

Allows, amongst other things, to override the size guessed
by the sub2video hack.

Note: the -s option could have more or less the same semantic,
but it receives a special treatment by the options system.

This helps lazy users who didn't read the part about boolean options, in
case they grep for "-nostats".

-stdin and -stats are the only booleans option enabled by default. This
is a partial fix for Trac ticket #2332, a complete overhaul of boolean
options documentation is probably overkill.

Fixes ticket #2299

Signed-off-by: Jean First <jeanfirst@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Non-ascii chars are not correctly rendered in both MAN and HTML output or
may even cause compilation failure. Thus avoid to use them until we find
a satisfying way to deal with them.

Fix trac ticket #2243.

The options have been deprecated and are non-operational since more than
two years.