Based on a patch by Stefano.

Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>

It allows to check if a given codec can be written into a container.

Its only reason for its existence was ffmpeg's inability to properly assign
AVOptions to streams. Now this is not a problem anymore, so 'ab' should
go.

It's often mistakenly used as 'same quality', emphasize that it's not
true in the manual.

The new option doesn't depend on its placement wrt -new* options (which
don't exist anymore) and works in a similar way as per-stream AVOptions.

-[vas]codec remain as aliases to -codec:[vas]

Nothing except x264 uses them and native x264 presets should be used
with private options.

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

The previous default value 0x0 was not good, since it is not even
valid.

The delogo filter has been natively integrated into libavfilter,
simplify.

The ported filter supports named option parsing and more YUV formats.

Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>

The new function provides a more flexible interface for peeking at a
FIFO buffer data.

Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>

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

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

New syntax contains an optional stream type, allowing to refer to n-th
stream of specific type.

Omitting stream number now maps all streams of the given type.

They are confusing, irregular and redundant -- -map already contains all
the information.  Stream maps can now be parsed in opt_output_file().

Add a more user-friendly default behavior in case no maps are present.

Breaks -programid for now, but it never worked properly anyway. A better
solution will be written soon.

Before, it took an input and output file index, now it only takes an
input file and applies to the next output file.

Stream/chapter/program specification is now part of the option name and
the delimiter was changed from ',' to ':' to be consistent with the
similar feature for AVOptions.

This is consistent with how all the other options work.

It will be further developed with a few incompatible changes.

ffmpeg.c will stay as is for some time, so any scripts using it won't be
broken.

This input device is to be considered still experimental, only video
output is supported.

The source was natively integrated into libavfilter, with the name
mptestsrc.

The gradfun filter was already integrated natively in libavfilter.
Both filters issue the same output, and have a comparable performance.

See thread:
Subject: [FFmpeg-devel] [PATCH] lavfi: remove gradfun mp wrapper
Date: Fri,  5 Aug 2011 00:19:04 +0200

Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>

0 is top-field-first, 1 is bottom-field-first, not the other way
around.

Fix trac issue #380.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

Draw the current grabbing region for indication.

Signed-off-by: Yu-Jie Lin <livibetter@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

-follow_mouse centered|PIXELS
  move grabbing region to where mouse pointer at the center; or
  only move when pointer reaches within PIXELS to the edge.

Signed-off-by: Yu-Jie Lin <livibetter@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Consistent with the pad and scale filters.

Previously, "dar" and "a" were documented like "input display aspect
ratio", but their actual value was "in_w/in_h".

In order to avoid to break scripts which rely on the "a" variable, the
patch keeps the same semantics but fixes the corresponding docs, and
fixes the semantics of the recently added "dar" variable, which
now correctly expresses the input Display Aspect Ratio value as
"(inw_w/in_h)*sar".

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>