@chapter Synopsis
-ffmpeg [@var{global_options}] @{[@var{input_file_options}] -i @file{input_file}@} ... @{[@var{output_file_options}] @file{output_file}@} ...
+ffmpeg [@var{global_options}] @{[@var{input_file_options}] -i @file{input_url}@} ... @{[@var{output_file_options}] @file{output_url}@} ...
@chapter Description
@c man begin DESCRIPTION
@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.
+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 file can, in principle, contain any number of streams of
+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
files and guessed from the file extension for output files, so this option is not
needed in most cases.
-@item -i @var{filename} (@emph{input})
-input file name
+@item -i @var{url} (@emph{input})
+input file url
@item -y (@emph{global})
Overwrite output files without asking.
When used as an input option (before @code{-i}), limit the @var{duration} of
data read from the input file.
-When used as an output option (before an output filename), stop writing the
+When used as an output option (before an output url), stop writing the
output after its duration reaches @var{duration}.
@var{duration} must be a time duration specification,
discarded. When doing stream copy or when @option{-noaccurate_seek} is used, it
will be preserved.
-When used as an output option (before an output filename), decodes but discards
+When used as an output option (before an output url), decodes but discards
input until the timestamps reach @var{position}.
@var{position} must be a time duration specification,
Dump video coding statistics to @file{vstats_HHMMSS.log}.
@item -vstats_file @var{file}
Dump video coding statistics to @var{file}.
+@item -vstats_version @var{file}
+Specifies which version of the vstats format to use. Default is 2.
+
+version = 1 :
+
+@code{frame= %5d q= %2.1f PSNR= %6.2f f_size= %6d s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s}
+
+version > 1:
+
+@code{out= %2d st= %2d frame= %5d q= %2.1f PSNR= %6.2f f_size= %6d s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s}
@item -top[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})
top=1/bottom=0/auto=-1 field first
@item -dc @var{precision}
@section Advanced options
@table @option
-@item -map [-]@var{input_file_id}[:@var{stream_specifier}][,@var{sync_file_id}[:@var{stream_specifier}]] | @var{[linklabel]} (@emph{output})
+@item -map [-]@var{input_file_id}[:@var{stream_specifier}][?][,@var{sync_file_id}[:@var{stream_specifier}]] | @var{[linklabel]} (@emph{output})
Designate one or more input streams as a source for the output file. Each input
stream is identified by the input file index @var{input_file_id} and
A @code{-} character before the stream identifier creates a "negative" mapping.
It disables matching streams from already created mappings.
+A trailing @code{?} after the stream index will allow the map to be
+optional: if the map matches no streams the map will be ignored instead
+of failing. Note the map will still fail if an invalid input file index
+is used; such as if the map refers to a non-existant input.
+
An alternative @var{[linklabel]} form will map outputs from complex filter
graphs (see the @option{-filter_complex} option) to the output file.
@var{linklabel} must correspond to a defined output link label in the graph.
ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT
@end example
+To map the video and audio streams from the first input, and using the
+trailing @code{?}, ignore the audio mapping if no audio streams exist in
+the first input:
+@example
+ffmpeg -i INPUT -map 0:v -map 0:a? OUTPUT
+@end example
+
To pick the English audio stream:
@example
ffmpeg -i INPUT -map 0:m:language:eng OUTPUT
For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
an output mpegts file:
@example
-ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
+ffmpeg -i inurl -streamid 0:33 -streamid 1:36 out.ts
@end example
@item -bsf[:@var{stream_specifier}] @var{bitstream_filters} (@emph{output,per-stream})
The mapping is particularly useful for DVD transcoding
to get the desired audio language.
-NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
+NOTE: To see the supported input formats, use @code{ffmpeg -demuxers}.
@item
You can extract images from a video, or create a video from many images:
projects / ffmpeg / blobdiff