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| -rw-r--r-- | doc/ffmpeg.texi | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi index 38d341e7c6..a826616aa5 100644 --- a/doc/ffmpeg.texi +++ b/doc/ffmpeg.texi @@ -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). Allowed 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 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). 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 |