@c man end DESCRIPTION
+@chapter Stream selection
+@c man begin STREAM SELECTION
+
+By default avconv tries to pick the "best" stream of each type present in input
+files and add them to each output file. For video, this means the highest
+resolution, for audio the highest channel count. For subtitle it's simply the
+first subtitle stream.
+
+You can disable some of those defaults by using @code{-vn/-an/-sn} options. For
+full manual control, use the @code{-map} option, which disables the defaults just
+described.
+
+@c man end STREAM SELECTION
+
@chapter Options
@c man begin OPTIONS
@item -y
Overwrite output files.
+@item -c[:@var{stream_type}][:@var{stream_index}] @var{codec}
+@item -codec[:@var{stream_type}][:@var{stream_index}] @var{codec}
+Select an encoder (when used before an output file) or a decoder (when used
+before an input file) for one or more streams. @var{codec} is the name of a
+decoder/encoder or a special value @code{copy} (output only) to indicate that
+the stream is not to be reencoded.
+
+@var{stream_type} may be 'v' for video, 'a' for audio, 's' for subtitle and 'd'
+for data streams. @var{stream_index} is a global zero-based stream index if
+@var{stream_type} isn't given, otherwise it counts only streams of the given
+type. If @var{stream_index} is omitted, this option applies to all streams of
+the given type or all streams of any type if @var{stream_type} is missing as
+well (note that this only makes sense when all streams are of the same type or
+@var{codec} is @code{copy}).
+
+For example
+@example
+avconv -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
+@end example
+encodes all video streams with libx264 and copies all audio streams.
+
+For each stream, the last matching @code{c} option is applied, so
+@example
+avconv -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
+@end example
+will copy all the streams except the second video, which will be encoded with
+libx264, and the 138th audio, which will be encoded with libvorbis.
+
@item -t @var{duration}
Restrict the transcoded/captured video sequence
to the duration specified in seconds.
Set the file size limit.
@item -ss @var{position}
-Seek to given time position in seconds.
-@code{hh:mm:ss[.xxx]} syntax is also supported.
+When used as an input option (before @code{-i}), seeks in this input file to
+@var{position}. When used as an output option (before an output filename),
+decodes but discards input until the timestamps reach @var{position}. This is
+slower, but more accurate.
+
+@var{position} may be either in seconds or in @code{hh:mm:ss[.xxx]} form.
@item -itsoffset @var{offset}
Set the input time offset in seconds.
@code{[-]hh:mm:ss[.xxx]} syntax is also supported.
-This option affects all the input files that follow it.
The offset is added to the timestamps of the input files.
Specifying a positive offset means that the corresponding
streams are delayed by 'offset' seconds.
If the year-month-day part is not specified it takes the current
year-month-day.
-@item -metadata @var{key}=@var{value}
+@item -metadata[:metadata_specifier] @var{key}=@var{value}
Set a metadata key/value pair.
+An optional @var{metadata_specifier} may be given to set metadata
+on streams or chapters. See @code{-map_metadata} documentation for
+details.
+
+This option overrides metadata set with @code{-map_metadata}. It is
+also possible to delete metadata by using an empty value.
+
For example, for setting the title in the output file:
@example
avconv -i in.avi -metadata title="my title" out.flv
@end example
+To set the language of the second stream:
+@example
+avconv -i INPUT -metadata:s:1 language=eng OUTPUT
+@end example
+
@item -v @var{number}
Set the logging verbosity level.
@end example
@item -dframes @var{number}
-Set the number of data frames to record.
+Set the number of data frames to record. This is an alias for @code{-frames:d}.
-@item -scodec @var{codec}
-Force subtitle codec ('copy' to copy stream).
+@item -frames[:stream_specifier] @var{framecount}
+Stop writing to the stream after @var{framecount} frames.
-@item -newsubtitle
-Add a new subtitle stream to the current output stream.
-
-@item -slang @var{code}
-Set the ISO 639 language code (3 letters) of the current subtitle stream.
+@item -q @var{q}
+@item -qscale @var{q}
+Use fixed quality scale (VBR). The meaning of @var{q} is
+codec-dependent.
@end table
@table @option
@item -vframes @var{number}
-Set the number of video frames to record.
+Set the number of video frames to record. This is an alias for @code{-frames:v}.
@item -r @var{fps}
Set frame rate (Hz value, fraction or abbreviation), (default = 25).
@item -s @var{size}
numerator and denominator of the aspect ratio. For example "4:3",
"16:9", "1.3333", and "1.7777" are valid argument values.
-@item -croptop @var{size}
-@item -cropbottom @var{size}
-@item -cropleft @var{size}
-@item -cropright @var{size}
-All the crop options have been removed. Use -vf
-crop=width:height:x:y instead.
-
-@item -padtop @var{size}
-@item -padbottom @var{size}
-@item -padleft @var{size}
-@item -padright @var{size}
-@item -padcolor @var{hex_color}
-All the pad options have been removed. Use -vf
-pad=width:height:x:y:color instead.
@item -vn
Disable video recording.
@item -bt @var{tolerance}
@item -bufsize @var{size}
Set video buffer verifier buffer size (in bits).
@item -vcodec @var{codec}
-Force video codec to @var{codec}. Use the @code{copy} special value to
-tell that the raw codec data must be copied as is.
-@item -sameq
+Set the video codec. This is an alias for @code{-codec:v}.
+@item -same_quant
Use same quantizer as source (implies VBR).
+Note that this is NOT SAME QUALITY. Do not use this option unless you know you
+need it.
+
@item -pass @var{n}
Select the pass number (1 or 2). It is used to do two-pass
video encoding. The statistics of the video are recorded in the first
On pass 1, you may just deactivate audio and set output to null,
examples for Windows and Unix:
@example
-avconv -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL
-avconv -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y /dev/null
+avconv -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
+avconv -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
@end example
@item -passlogfile @var{prefix}
@file{PREFIX-N.log}, where N is a number specific to the output
stream.
-@item -newvideo
-Add a new video stream to the current output stream.
-
-@item -vlang @var{code}
-Set the ISO 639 language code (3 letters) of the current video stream.
-
@item -vf @var{filter_graph}
@var{filter_graph} is a description of the filter graph to apply to
the input video.
Set SwScaler flags.
@item -g @var{gop_size}
Set the group of pictures size.
-@item -intra
-Use only intra frames.
@item -vdt @var{n}
Discard threshold.
-@item -qscale @var{q}
-Use fixed video quantizer scale (VBR).
@item -qmin @var{q}
minimum video quantizer scale (VBR)
@item -qmax @var{q}
@item -dc @var{precision}
Intra_dc_precision.
@item -vtag @var{fourcc/tag}
-Force video tag/fourcc.
+Force video tag/fourcc. This is an alias for @code{-tag:v}.
@item -qphist
Show QP histogram.
-@item -vbsf @var{bitstream_filter}
-Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
-@example
-avconv -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
-@end example
@item -force_key_frames @var{time}[,@var{time}...]
Force key frames at the specified timestamps, more precisely at the first
frames after each specified time.
@table @option
@item -aframes @var{number}
-Set the number of audio frames to record.
+Set the number of audio frames to record. This is an alias for @code{-frames:a}.
@item -ar @var{freq}
Set the audio sampling frequency. For output streams it is set by
default to the frequency of the corresponding input stream. For input
streams this option only makes sense for audio grabbing devices and raw
demuxers and is mapped to the corresponding demuxer options.
@item -aq @var{q}
-Set the audio quality (codec-specific, VBR).
+Set the audio quality (codec-specific, VBR). This is an alias for -q:a.
@item -ac @var{channels}
Set the number of audio channels. For output streams it is set by
default to the number of input audio channels. For input streams
@item -an
Disable audio recording.
@item -acodec @var{codec}
-Force audio codec to @var{codec}. Use the @code{copy} special value to
-specify that the raw codec data must be copied as is.
-@item -newaudio
-Add a new audio track to the output file. If you want to specify parameters,
-do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
-
-Mapping will be done automatically, if the number of output streams is equal to
-the number of input streams, else it will pick the first one that matches. You
-can override the mapping using @code{-map} as usual.
-
-Example:
-@example
-avconv -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
-@end example
-@item -alang @var{code}
-Set the ISO 639 language code (3 letters) of the current audio stream.
+Set the audio codec. This is an alias for @code{-codec:a}.
+@item -sample_fmt[:@var{stream_specifier}] @var{sample_fmt}
+Set the audio sample format. Use @code{-help sample_fmts} to get a list
+of supported sample formats.
@end table
@section Advanced Audio options:
@table @option
@item -atag @var{fourcc/tag}
-Force audio tag/fourcc.
+Force audio tag/fourcc. This is an alias for @code{-tag:a}.
@item -audio_service_type @var{type}
Set the type of service that the audio stream contains.
@table @option
@item ka
Karaoke
@end table
-@item -absf @var{bitstream_filter}
-Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
@end table
@section Subtitle options:
@table @option
@item -scodec @var{codec}
-Force subtitle codec ('copy' to copy stream).
-@item -newsubtitle
-Add a new subtitle stream to the current output stream.
-@item -slang @var{code}
-Set the ISO 639 language code (3 letters) of the current subtitle stream.
+Set the subtitle codec. This is an alias for @code{-codec:s}.
@item -sn
Disable subtitle recording.
-@item -sbsf @var{bitstream_filter}
-Bitstream filters available are "mov2textsub", "text2movsub".
-@example
-avconv -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
-@end example
@end table
@section Audio/Video grab options
@table @option
-@item -vc @var{channel}
-Set video grab channel (DV1394 only).
-@item -tvstd @var{standard}
-Set television standard (NTSC, PAL (SECAM)).
@item -isync
Synchronize read on input.
@end table
@section Advanced options
@table @option
-@item -map @var{input_file_id}.@var{input_stream_id}[:@var{sync_file_id}.@var{sync_stream_id}]
+@item -map [-]@var{input_file_id}[:@var{input_stream_type}][:@var{input_stream_id}][,@var{sync_file_id}[:@var{sync_stream_type}][:@var{sync_stream_id}]]
-Designate an input stream as a source for the output file. Each input
+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
the input stream index @var{input_stream_id} within the input
-file. Both indexes start at 0. If specified,
-@var{sync_file_id}.@var{sync_stream_id} sets which input stream
+file. Both indices start at 0. If specified,
+@var{sync_file_id}:@var{sync_stream_id} sets which input stream
is used as a presentation sync reference.
-The @code{-map} options must be specified just after the output file.
-If any @code{-map} options are used, the number of @code{-map} options
-on the command line must match the number of streams in the output
-file. The first @code{-map} option on the command line specifies the
+If @var{input_stream_type} is specified -- 'v' for video, 'a' for audio, 's' for
+subtitle and 'd' for data -- then @var{input_stream_id} counts only the streams
+of this type. Same for @var{sync_stream_type}.
+
+@var{input_stream_id} may be omitted, in which case all streams of the given
+type are mapped (or all streams in the file, if no type is specified).
+
+The first @code{-map} option on the command line specifies the
source for output stream 0, the second @code{-map} option specifies
the source for output stream 1, etc.
+A @code{-} character before the stream identifier creates a "negative" mapping.
+It disables matching streams from already created mappings.
+
+For example, to map ALL streams from the first input file to output
+@example
+avconv -i INPUT -map 0 output
+@end example
+
For example, if you have two audio streams in the first input file,
-these streams are identified by "0.0" and "0.1". You can use
-@code{-map} to select which stream to place in an output file. For
+these streams are identified by "0:0" and "0:1". You can use
+@code{-map} to select which streams to place in an output file. For
example:
@example
-avconv -i INPUT out.wav -map 0.1
+avconv -i INPUT -map 0:1 out.wav
@end example
-will map the input stream in @file{INPUT} identified by "0.1" to
+will map the input stream in @file{INPUT} identified by "0:1" to
the (single) output stream in @file{out.wav}.
For example, to select the stream with index 2 from input file
-@file{a.mov} (specified by the identifier "0.2"), and stream with
-index 6 from input @file{b.mov} (specified by the identifier "1.6"),
+@file{a.mov} (specified by the identifier "0:2"), and stream with
+index 6 from input @file{b.mov} (specified by the identifier "1:6"),
and copy them to the output file @file{out.mov}:
@example
-avconv -i a.mov -i b.mov -vcodec copy -acodec copy out.mov -map 0.2 -map 1.6
+avconv -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov
@end example
-To add more streams to the output file, you can use the
-@code{-newaudio}, @code{-newvideo}, @code{-newsubtitle} options.
+To select all video and the third audio stream from an input file:
+@example
+avconv -i INPUT -map 0:v -map 0:a:2 OUTPUT
+@end example
-@item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
-Deprecated, use @var{-map_metadata} instead.
+To map all the streams except the second audio, use negative mappings
+@example
+avconv -i INPUT -map 0 -map -0:a:1 OUTPUT
+@end example
+
+Note that using this option disables the default mappings for this output file.
-@item -map_metadata @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
-Set metadata information of @var{outfile} from @var{infile}. Note that those
-are file indices (zero-based), not filenames.
-Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
+@item -map_metadata[:@var{metadata_type}][:@var{index}] @var{infile}[:@var{metadata_type}][:@var{index}]
+Set metadata information of the next output file from @var{infile}. Note that
+those are file indices (zero-based), not filenames.
+Optional @var{metadata_type} parameters specify, which metadata to copy - (g)lobal
(i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
per-(p)rogram. All metadata specifiers other than global must be followed by the
-stream/chapter/program number. If metadata specifier is omitted, it defaults to
+stream/chapter/program index. If metadata specifier is omitted, it defaults to
global.
-By default, global metadata is copied from the first input file to all output files,
+By default, global metadata is copied from the first input file,
per-stream and per-chapter metadata is copied along with streams/chapters. These
default mappings are disabled by creating any mapping of the relevant type. A negative
file index can be used to create a dummy mapping that just disables automatic copying.
For example to copy metadata from the first stream of the input file to global metadata
of the output file:
@example
-avconv -i in.ogg -map_metadata 0:0,s0 out.mp3
+avconv -i in.ogg -map_metadata 0:s:0 out.mp3
@end example
-@item -map_chapters @var{outfile}:@var{infile}
-Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
-then chapters are copied from the first input file with at least one chapter to all
-output files. Use a negative file index to disable any chapter copying.
+@item -map_chapters @var{input_file_index}
+Copy chapters from input file with index @var{input_file_index} to the next
+output file. If no chapter mapping is specified, then chapters are copied from
+the first input file with at least one chapter. Use a negative file index to
+disable any chapter copying.
@item -debug
Print specific debug info.
@item -benchmark
Set RTP payload size in bytes.
@item -re
Read input at native frame rate. Mainly used to simulate a grab device.
-@item -loop_input
-Loop over the input stream. Currently it works only for image
-streams. This option is used for automatic AVserver testing.
-This option is deprecated, use -loop.
-@item -loop_output @var{number_of_times}
-Repeatedly loop output for formats that support looping such as animated GIF
-(0 will loop the output infinitely).
-This option is deprecated, use -loop.
@item -threads @var{count}
Thread count.
@item -vsync @var{parameter}
@example
avconv -i infile -streamid 0:33 -streamid 1:36 out.ts
@end example
-@end table
-@section Preset files
-
-A preset file contains a sequence of @var{option}=@var{value} pairs,
-one for each line, specifying a sequence of options which would be
-awkward to specify on the command line. Lines starting with the hash
-('#') character are ignored and are used to provide comments. Check
-the @file{ffpresets} directory in the Libav source tree for examples.
-
-Preset files are specified with the @code{vpre}, @code{apre},
-@code{spre}, and @code{fpre} options. The @code{fpre} option takes the
-filename of the preset instead of a preset name as input and can be
-used for any kind of codec. For the @code{vpre}, @code{apre}, and
-@code{spre} options, the options specified in a preset file are
-applied to the currently selected codec of the same type as the preset
-option.
-
-The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
-preset options identifies the preset file to use according to the
-following rules:
-
-First avconv searches for a file named @var{arg}.ffpreset in the
-directories @file{$av_DATADIR} (if set), and @file{$HOME/.avconv}, and in
-the datadir defined at configuration time (usually @file{PREFIX/share/avconv})
-in that order. For example, if the argument is @code{libx264-max}, it will
-search for the file @file{libx264-max.ffpreset}.
-
-If no such file is found, then avconv will search for a file named
-@var{codec_name}-@var{arg}.ffpreset in the above-mentioned
-directories, where @var{codec_name} is the name of the codec to which
-the preset file options will be applied. For example, if you select
-the video codec with @code{-vcodec libx264} and use @code{-vpre max},
-then it will search for the file @file{libx264-max.ffpreset}.
-@c man end
+@item -bsf[:@var{stream_specifier}] @var{bitstream_filters}
+Set bitstream filters for matching streams. @var{bistream_filters} is
+a comma-separated list of bitstream filters. Use the @code{-bsfs} option
+to get the list of bitstream filters.
+@example
+avconv -i h264.mp4 -c:v copy -vbsf h264_mp4toannexb -an out.h264
+@end example
+@example
+avconv -i file.mov -an -vn -sbsf mov2textsub -c:s copy -f rawvideo sub.txt
+@end example
+
+@item -tag[:@var{stream_specifier}] @var{codec_tag}
+Force a tag/fourcc for matching streams.
+@end table
+@c man end OPTIONS
@chapter Tips
@c man begin TIPS
'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
quality).
-@item
-When converting video files, you can use the '-sameq' option which
-uses the same quality factor in the encoder as in the decoder.
-It allows almost lossless encoding.
-
@end itemize
@c man end TIPS
mapping from input stream to output streams:
@example
-avconv -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
+avconv -i /tmp/a.wav -map 0:a -b 64k /tmp/a.mp2 -map 0:a -b 128k /tmp/b.mp2
@end example
Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
You can transcode decrypted VOBs:
@example
-avconv -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
+avconv -i snatch_1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi
@end example
This is a typical DVD ripping example; the input is a VOB file, the
You can put many streams of the same type in the output:
@example
-avconv -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
+avconv -i test1.avi -i test2.avi -map 0.3 -map 0.2 -map 0.1 -map 0.0 -c copy test12.nut
@end example
-In addition to the first video and audio streams, the resulting
-output file @file{test12.avi} will contain the second video
-and the second audio stream found in the input streams list.
-
-The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
-options have to be specified immediately after the name of the output
-file to which you want to add them.
+The resulting output file @file{test12.avi} will contain first four streams from
+the input file in reverse order.
@end itemize
@c man end EXAMPLES
OSDN Git Service
