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Linshizhi
ffmpeg.wasm-core
Commits
91b5ee66
Commit
91b5ee66
authored
Mar 30, 2013
by
Derek Buitenhuis
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doc: Grammar fixes for FFmpeg description
Signed-off-by:
Derek Buitenhuis
<
derek.buitenhuis@gmail.com
>
parent
9f597052
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91b5ee66
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@@ -16,26 +16,26 @@ ffmpeg [@var{global_options}] @{[@var{input_file_options}] -i @file{input_file}@
@chapter Description
@c man begin DESCRIPTION
ffmpeg
is a very fast video and audio converter that can also grab from
@command
{
ffmpeg
}
is a very fast video and audio converter that can also grab from
a live audio/video source. It can also convert between arbitrary sample
rates and resize video on the fly with a high quality polyphase filter.
ffmpeg
reads from an arbitrary number of input "files" (which can be regular
@command
{
ffmpeg
}
reads from an arbitrary number of input "files" (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 filename. Anything found on the command line which
cannot be interpreted as an option is considered to be an output filename.
Each input or output file can
in principle
contain any number of streams of
different types (video/audio/subtitle/attachment/data).
A
llowed number and/or
types of streams
can be limited by the container format. Selecting,
which
streams from which inputs
go into output, is done either automatically or with
the @code
{
-map
}
option (see the Stream selection chapter).
Each input or output file can
, in principle,
contain any number of streams of
different types (video/audio/subtitle/attachment/data).
The a
llowed 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).
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
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.
See also
the Stream specifiers chapter.
fourth stream in the third input file.
Also see
the 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
...
...
@@ -50,7 +50,7 @@ options apply ONLY to the next input or output file and are reset between files.
@itemize
@item
To set the video bitrate of the output file to 64kbit/s:
To set the video bitrate of the output file to 64
kbit/s:
@example
ffmpeg -i input.avi -b:v 64k -bufsize 64k output.avi
@end example
...
...
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