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doc/ffmpeg: improve wording in the description section

This commit is contained in:
Anton Khirnov 2024-09-11 12:45:16 +02:00
parent a3ec1f8c6c
commit 78170120ca
1 changed files with 16 additions and 13 deletions
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doc/ffmpeg.texi
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@ -21,22 +21,24 @@ ffmpeg [@var{global_options}] @{[@var{input_file_options}] -i @file{input_url}@}
inputs - including live grabbing/recording devices - filter, and transcode them
into a plethora of output formats.
@command{ffmpeg} reads from an arbitrary number of input "files" (which can be regular
@command{ffmpeg} reads from an arbitrary number of inputs (which can be regular
files, pipes, network streams, grabbing devices, etc.), specified by the
@code{-i} option, and writes to an arbitrary number of output "files", which are
specified by a plain output url. Anything found on the command line which
cannot be interpreted as an option is considered to be an output url.
@code{-i} option, and writes to an arbitrary number of outputs, which are
specified by a plain output url. Anything found on the command line which cannot
be interpreted as an option is considered to be an output url.
Each input or output url can, in principle, contain any number of streams of
different types (video/audio/subtitle/attachment/data). The allowed number and/or
types of streams may be limited by the container format. Selecting which
streams from which inputs will go into which output is either done automatically
or with the @code{-map} option (see the Stream selection chapter).
Each input or output can, in principle, contain any number of elementary streams
of different types (video/audio/subtitle/attachment/data), though the allowed
stream counts and/or types may be limited by the container format. Selecting
which streams from which inputs will go into which output is either done
automatically or with the @code{-map} option (see the @ref{Stream selection}
chapter).
To refer to input files in options, you must use their indices (0-based). E.g.
the first input file is @code{0}, the second is @code{1}, etc. Similarly, streams
within a file are referred to by their indices. E.g. @code{2:3} refers to the
fourth stream in the third input file. Also see the Stream specifiers chapter.
To refer to inputs/outputs in options, you must use their indices (0-based).
E.g. the first input is @code{0}, the second is @code{1}, etc. Similarly,
streams within an input/output are referred to by their indices. E.g. @code{2:3}
refers to the fourth stream in the third input or output. Also see the
@ref{Stream specifiers} chapter.
As a general rule, options are applied to the next specified
file. Therefore, order is important, and you can have the same
@ -261,6 +263,7 @@ reads an input video and
@c man end DETAILED DESCRIPTION
@anchor{Stream selection}
@chapter Stream selection
@c man begin STREAM SELECTION