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836 lines
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Executable File
836 lines
28 KiB
Plaintext
Executable File
@chapter Demuxers
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@c man begin DEMUXERS
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Demuxers are configured elements in FFmpeg that can read the
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multimedia streams from a particular type of file.
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When you configure your FFmpeg build, all the supported demuxers
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are enabled by default. You can list all available ones using the
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configure option @code{--list-demuxers}.
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You can disable all the demuxers using the configure option
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@code{--disable-demuxers}, and selectively enable a single demuxer with
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the option @code{--enable-demuxer=@var{DEMUXER}}, or disable it
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with the option @code{--disable-demuxer=@var{DEMUXER}}.
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The option @code{-demuxers} of the ff* tools will display the list of
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enabled demuxers. Use @code{-formats} to view a combined list of
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enabled demuxers and muxers.
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The description of some of the currently available demuxers follows.
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@section aa
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Audible Format 2, 3, and 4 demuxer.
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This demuxer is used to demux Audible Format 2, 3, and 4 (.aa) files.
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@section apng
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Animated Portable Network Graphics demuxer.
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This demuxer is used to demux APNG files.
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All headers, but the PNG signature, up to (but not including) the first
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fcTL chunk are transmitted as extradata.
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Frames are then split as being all the chunks between two fcTL ones, or
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between the last fcTL and IEND chunks.
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@table @option
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@item -ignore_loop @var{bool}
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Ignore the loop variable in the file if set.
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@item -max_fps @var{int}
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Maximum framerate in frames per second (0 for no limit).
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@item -default_fps @var{int}
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Default framerate in frames per second when none is specified in the file
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(0 meaning as fast as possible).
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@end table
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@section asf
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Advanced Systems Format demuxer.
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This demuxer is used to demux ASF files and MMS network streams.
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@table @option
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@item -no_resync_search @var{bool}
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Do not try to resynchronize by looking for a certain optional start code.
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@end table
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@anchor{concat}
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@section concat
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Virtual concatenation script demuxer.
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This demuxer reads a list of files and other directives from a text file and
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demuxes them one after the other, as if all their packets had been muxed
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together.
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The timestamps in the files are adjusted so that the first file starts at 0
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and each next file starts where the previous one finishes. Note that it is
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done globally and may cause gaps if all streams do not have exactly the same
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length.
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All files must have the same streams (same codecs, same time base, etc.).
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The duration of each file is used to adjust the timestamps of the next file:
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if the duration is incorrect (because it was computed using the bit-rate or
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because the file is truncated, for example), it can cause artifacts. The
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@code{duration} directive can be used to override the duration stored in
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each file.
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@subsection Syntax
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The script is a text file in extended-ASCII, with one directive per line.
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Empty lines, leading spaces and lines starting with '#' are ignored. The
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following directive is recognized:
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@table @option
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@item @code{file @var{path}}
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Path to a file to read; special characters and spaces must be escaped with
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backslash or single quotes.
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All subsequent file-related directives apply to that file.
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@item @code{ffconcat version 1.0}
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Identify the script type and version. It also sets the @option{safe} option
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to 1 if it was -1.
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To make FFmpeg recognize the format automatically, this directive must
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appear exactly as is (no extra space or byte-order-mark) on the very first
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line of the script.
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@item @code{duration @var{dur}}
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Duration of the file. This information can be specified from the file;
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specifying it here may be more efficient or help if the information from the
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file is not available or accurate.
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If the duration is set for all files, then it is possible to seek in the
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whole concatenated video.
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@item @code{inpoint @var{timestamp}}
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In point of the file. When the demuxer opens the file it instantly seeks to the
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specified timestamp. Seeking is done so that all streams can be presented
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successfully at In point.
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This directive works best with intra frame codecs, because for non-intra frame
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ones you will usually get extra packets before the actual In point and the
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decoded content will most likely contain frames before In point too.
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For each file, packets before the file In point will have timestamps less than
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the calculated start timestamp of the file (negative in case of the first
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file), and the duration of the files (if not specified by the @code{duration}
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directive) will be reduced based on their specified In point.
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Because of potential packets before the specified In point, packet timestamps
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may overlap between two concatenated files.
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@item @code{outpoint @var{timestamp}}
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Out point of the file. When the demuxer reaches the specified decoding
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timestamp in any of the streams, it handles it as an end of file condition and
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skips the current and all the remaining packets from all streams.
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Out point is exclusive, which means that the demuxer will not output packets
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with a decoding timestamp greater or equal to Out point.
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This directive works best with intra frame codecs and formats where all streams
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are tightly interleaved. For non-intra frame codecs you will usually get
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additional packets with presentation timestamp after Out point therefore the
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decoded content will most likely contain frames after Out point too. If your
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streams are not tightly interleaved you may not get all the packets from all
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streams before Out point and you may only will be able to decode the earliest
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stream until Out point.
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The duration of the files (if not specified by the @code{duration}
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directive) will be reduced based on their specified Out point.
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@item @code{file_packet_metadata @var{key=value}}
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Metadata of the packets of the file. The specified metadata will be set for
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each file packet. You can specify this directive multiple times to add multiple
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metadata entries.
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@item @code{stream}
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Introduce a stream in the virtual file.
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All subsequent stream-related directives apply to the last introduced
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stream.
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Some streams properties must be set in order to allow identifying the
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matching streams in the subfiles.
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If no streams are defined in the script, the streams from the first file are
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copied.
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@item @code{exact_stream_id @var{id}}
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Set the id of the stream.
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If this directive is given, the string with the corresponding id in the
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subfiles will be used.
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This is especially useful for MPEG-PS (VOB) files, where the order of the
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streams is not reliable.
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@end table
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@subsection Options
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This demuxer accepts the following option:
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@table @option
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@item safe
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If set to 1, reject unsafe file paths. A file path is considered safe if it
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does not contain a protocol specification and is relative and all components
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only contain characters from the portable character set (letters, digits,
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period, underscore and hyphen) and have no period at the beginning of a
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component.
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If set to 0, any file name is accepted.
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The default is 1.
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-1 is equivalent to 1 if the format was automatically
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probed and 0 otherwise.
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@item auto_convert
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If set to 1, try to perform automatic conversions on packet data to make the
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streams concatenable.
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The default is 1.
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Currently, the only conversion is adding the h264_mp4toannexb bitstream
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filter to H.264 streams in MP4 format. This is necessary in particular if
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there are resolution changes.
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@item segment_time_metadata
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If set to 1, every packet will contain the @var{lavf.concat.start_time} and the
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@var{lavf.concat.duration} packet metadata values which are the start_time and
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the duration of the respective file segments in the concatenated output
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expressed in microseconds. The duration metadata is only set if it is known
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based on the concat file.
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The default is 0.
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@end table
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@subsection Examples
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@itemize
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@item
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Use absolute filenames and include some comments:
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@example
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# my first filename
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file /mnt/share/file-1.wav
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# my second filename including whitespace
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file '/mnt/share/file 2.wav'
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# my third filename including whitespace plus single quote
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file '/mnt/share/file 3'\''.wav'
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@end example
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@item
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Allow for input format auto-probing, use safe filenames and set the duration of
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the first file:
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@example
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ffconcat version 1.0
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file file-1.wav
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duration 20.0
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file subdir/file-2.wav
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@end example
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@end itemize
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@section dash
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Dynamic Adaptive Streaming over HTTP demuxer.
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This demuxer presents all AVStreams found in the manifest.
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By setting the discard flags on AVStreams the caller can decide
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which streams to actually receive.
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Each stream mirrors the @code{id} and @code{bandwidth} properties from the
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@code{<Representation>} as metadata keys named "id" and "variant_bitrate" respectively.
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@section flv, live_flv
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Adobe Flash Video Format demuxer.
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This demuxer is used to demux FLV files and RTMP network streams. In case of live network streams, if you force format, you may use live_flv option instead of flv to survive timestamp discontinuities.
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@example
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ffmpeg -f flv -i myfile.flv ...
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ffmpeg -f live_flv -i rtmp://<any.server>/anything/key ....
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@end example
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@table @option
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@item -flv_metadata @var{bool}
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Allocate the streams according to the onMetaData array content.
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@item -flv_ignore_prevtag @var{bool}
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Ignore the size of previous tag value.
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@item -flv_full_metadata @var{bool}
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Output all context of the onMetadata.
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@end table
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@section gif
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Animated GIF demuxer.
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It accepts the following options:
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@table @option
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@item min_delay
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Set the minimum valid delay between frames in hundredths of seconds.
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Range is 0 to 6000. Default value is 2.
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@item max_gif_delay
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Set the maximum valid delay between frames in hundredth of seconds.
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Range is 0 to 65535. Default value is 65535 (nearly eleven minutes),
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the maximum value allowed by the specification.
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@item default_delay
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Set the default delay between frames in hundredths of seconds.
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Range is 0 to 6000. Default value is 10.
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@item ignore_loop
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GIF files can contain information to loop a certain number of times (or
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infinitely). If @option{ignore_loop} is set to 1, then the loop setting
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from the input will be ignored and looping will not occur. If set to 0,
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then looping will occur and will cycle the number of times according to
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the GIF. Default value is 1.
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@end table
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For example, with the overlay filter, place an infinitely looping GIF
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over another video:
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@example
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ffmpeg -i input.mp4 -ignore_loop 0 -i input.gif -filter_complex overlay=shortest=1 out.mkv
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@end example
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Note that in the above example the shortest option for overlay filter is
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used to end the output video at the length of the shortest input file,
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which in this case is @file{input.mp4} as the GIF in this example loops
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infinitely.
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@section hls
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HLS demuxer
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Apple HTTP Live Streaming demuxer.
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This demuxer presents all AVStreams from all variant streams.
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The id field is set to the bitrate variant index number. By setting
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the discard flags on AVStreams (by pressing 'a' or 'v' in ffplay),
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the caller can decide which variant streams to actually receive.
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The total bitrate of the variant that the stream belongs to is
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available in a metadata key named "variant_bitrate".
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It accepts the following options:
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@table @option
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@item live_start_index
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segment index to start live streams at (negative values are from the end).
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@item allowed_extensions
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',' separated list of file extensions that hls is allowed to access.
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@item max_reload
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Maximum number of times a insufficient list is attempted to be reloaded.
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Default value is 1000.
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@item m3u8_hold_counters
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The maximum number of times to load m3u8 when it refreshes without new segments.
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Default value is 1000.
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@item http_persistent
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Use persistent HTTP connections. Applicable only for HTTP streams.
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Enabled by default.
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@item http_multiple
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Use multiple HTTP connections for downloading HTTP segments.
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Enabled by default for HTTP/1.1 servers.
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@item http_seekable
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Use HTTP partial requests for downloading HTTP segments.
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0 = disable, 1 = enable, -1 = auto, Default is auto.
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@end table
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@section image2
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Image file demuxer.
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This demuxer reads from a list of image files specified by a pattern.
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The syntax and meaning of the pattern is specified by the
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option @var{pattern_type}.
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The pattern may contain a suffix which is used to automatically
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determine the format of the images contained in the files.
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The size, the pixel format, and the format of each image must be the
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same for all the files in the sequence.
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This demuxer accepts the following options:
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@table @option
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@item framerate
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Set the frame rate for the video stream. It defaults to 25.
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@item loop
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If set to 1, loop over the input. Default value is 0.
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@item pattern_type
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Select the pattern type used to interpret the provided filename.
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@var{pattern_type} accepts one of the following values.
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@table @option
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@item none
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Disable pattern matching, therefore the video will only contain the specified
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image. You should use this option if you do not want to create sequences from
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multiple images and your filenames may contain special pattern characters.
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@item sequence
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Select a sequence pattern type, used to specify a sequence of files
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indexed by sequential numbers.
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A sequence pattern may contain the string "%d" or "%0@var{N}d", which
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specifies the position of the characters representing a sequential
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number in each filename matched by the pattern. If the form
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"%d0@var{N}d" is used, the string representing the number in each
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filename is 0-padded and @var{N} is the total number of 0-padded
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digits representing the number. The literal character '%' can be
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specified in the pattern with the string "%%".
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If the sequence pattern contains "%d" or "%0@var{N}d", the first filename of
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the file list specified by the pattern must contain a number
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inclusively contained between @var{start_number} and
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@var{start_number}+@var{start_number_range}-1, and all the following
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numbers must be sequential.
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For example the pattern "img-%03d.bmp" will match a sequence of
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filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
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@file{img-010.bmp}, etc.; the pattern "i%%m%%g-%d.jpg" will match a
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sequence of filenames of the form @file{i%m%g-1.jpg},
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@file{i%m%g-2.jpg}, ..., @file{i%m%g-10.jpg}, etc.
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Note that the pattern must not necessarily contain "%d" or
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"%0@var{N}d", for example to convert a single image file
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@file{img.jpeg} you can employ the command:
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@example
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ffmpeg -i img.jpeg img.png
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@end example
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@item glob
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Select a glob wildcard pattern type.
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The pattern is interpreted like a @code{glob()} pattern. This is only
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selectable if libavformat was compiled with globbing support.
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@item glob_sequence @emph{(deprecated, will be removed)}
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Select a mixed glob wildcard/sequence pattern.
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If your version of libavformat was compiled with globbing support, and
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the provided pattern contains at least one glob meta character among
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@code{%*?[]@{@}} that is preceded by an unescaped "%", the pattern is
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interpreted like a @code{glob()} pattern, otherwise it is interpreted
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like a sequence pattern.
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All glob special characters @code{%*?[]@{@}} must be prefixed
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with "%". To escape a literal "%" you shall use "%%".
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For example the pattern @code{foo-%*.jpeg} will match all the
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filenames prefixed by "foo-" and terminating with ".jpeg", and
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@code{foo-%?%?%?.jpeg} will match all the filenames prefixed with
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"foo-", followed by a sequence of three characters, and terminating
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with ".jpeg".
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This pattern type is deprecated in favor of @var{glob} and
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@var{sequence}.
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@end table
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Default value is @var{glob_sequence}.
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@item pixel_format
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Set the pixel format of the images to read. If not specified the pixel
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format is guessed from the first image file in the sequence.
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@item start_number
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Set the index of the file matched by the image file pattern to start
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to read from. Default value is 0.
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@item start_number_range
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Set the index interval range to check when looking for the first image
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file in the sequence, starting from @var{start_number}. Default value
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is 5.
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@item ts_from_file
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If set to 1, will set frame timestamp to modification time of image file. Note
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that monotonity of timestamps is not provided: images go in the same order as
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without this option. Default value is 0.
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If set to 2, will set frame timestamp to the modification time of the image file in
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nanosecond precision.
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@item video_size
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Set the video size of the images to read. If not specified the video
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size is guessed from the first image file in the sequence.
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@item export_path_metadata
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If set to 1, will add two extra fields to the metadata found in input, making them
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also available for other filters (see @var{drawtext} filter for examples). Default
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value is 0. The extra fields are described below:
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@table @option
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@item lavf.image2dec.source_path
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Corresponds to the full path to the input file being read.
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@item lavf.image2dec.source_basename
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Corresponds to the name of the file being read.
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@end table
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@end table
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@subsection Examples
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@itemize
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@item
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Use @command{ffmpeg} for creating a video from the images in the file
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sequence @file{img-001.jpeg}, @file{img-002.jpeg}, ..., assuming an
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input frame rate of 10 frames per second:
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@example
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ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv
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@end example
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@item
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As above, but start by reading from a file with index 100 in the sequence:
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@example
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ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
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@end example
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@item
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Read images matching the "*.png" glob pattern , that is all the files
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terminating with the ".png" suffix:
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@example
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ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv
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@end example
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@end itemize
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@section libgme
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The Game Music Emu library is a collection of video game music file emulators.
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See @url{https://bitbucket.org/mpyne/game-music-emu/overview} for more information.
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It accepts the following options:
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@table @option
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@item track_index
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Set the index of which track to demux. The demuxer can only export one track.
|
|
Track indexes start at 0. Default is to pick the first track. Number of tracks
|
|
is exported as @var{tracks} metadata entry.
|
|
|
|
@item sample_rate
|
|
Set the sampling rate of the exported track. Range is 1000 to 999999. Default is 44100.
|
|
|
|
@item max_size @emph{(bytes)}
|
|
The demuxer buffers the entire file into memory. Adjust this value to set the maximum buffer size,
|
|
which in turn, acts as a ceiling for the size of files that can be read.
|
|
Default is 50 MiB.
|
|
|
|
@end table
|
|
|
|
@section libmodplug
|
|
|
|
ModPlug based module demuxer
|
|
|
|
See @url{https://github.com/Konstanty/libmodplug}
|
|
|
|
It will export one 2-channel 16-bit 44.1 kHz audio stream.
|
|
Optionally, a @code{pal8} 16-color video stream can be exported with or without printed metadata.
|
|
|
|
It accepts the following options:
|
|
|
|
@table @option
|
|
@item noise_reduction
|
|
Apply a simple low-pass filter. Can be 1 (on) or 0 (off). Default is 0.
|
|
|
|
@item reverb_depth
|
|
Set amount of reverb. Range 0-100. Default is 0.
|
|
|
|
@item reverb_delay
|
|
Set delay in ms, clamped to 40-250 ms. Default is 0.
|
|
|
|
@item bass_amount
|
|
Apply bass expansion a.k.a. XBass or megabass. Range is 0 (quiet) to 100 (loud). Default is 0.
|
|
|
|
@item bass_range
|
|
Set cutoff i.e. upper-bound for bass frequencies. Range is 10-100 Hz. Default is 0.
|
|
|
|
@item surround_depth
|
|
Apply a Dolby Pro-Logic surround effect. Range is 0 (quiet) to 100 (heavy). Default is 0.
|
|
|
|
@item surround_delay
|
|
Set surround delay in ms, clamped to 5-40 ms. Default is 0.
|
|
|
|
@item max_size
|
|
The demuxer buffers the entire file into memory. Adjust this value to set the maximum buffer size,
|
|
which in turn, acts as a ceiling for the size of files that can be read. Range is 0 to 100 MiB.
|
|
0 removes buffer size limit (not recommended). Default is 5 MiB.
|
|
|
|
@item video_stream_expr
|
|
String which is evaluated using the eval API to assign colors to the generated video stream.
|
|
Variables which can be used are @code{x}, @code{y}, @code{w}, @code{h}, @code{t}, @code{speed},
|
|
@code{tempo}, @code{order}, @code{pattern} and @code{row}.
|
|
|
|
@item video_stream
|
|
Generate video stream. Can be 1 (on) or 0 (off). Default is 0.
|
|
|
|
@item video_stream_w
|
|
Set video frame width in 'chars' where one char indicates 8 pixels. Range is 20-512. Default is 30.
|
|
|
|
@item video_stream_h
|
|
Set video frame height in 'chars' where one char indicates 8 pixels. Range is 20-512. Default is 30.
|
|
|
|
@item video_stream_ptxt
|
|
Print metadata on video stream. Includes @code{speed}, @code{tempo}, @code{order}, @code{pattern},
|
|
@code{row} and @code{ts} (time in ms). Can be 1 (on) or 0 (off). Default is 1.
|
|
|
|
@end table
|
|
|
|
@section libopenmpt
|
|
|
|
libopenmpt based module demuxer
|
|
|
|
See @url{https://lib.openmpt.org/libopenmpt/} for more information.
|
|
|
|
Some files have multiple subsongs (tracks) this can be set with the @option{subsong}
|
|
option.
|
|
|
|
It accepts the following options:
|
|
|
|
@table @option
|
|
@item subsong
|
|
Set the subsong index. This can be either 'all', 'auto', or the index of the
|
|
subsong. Subsong indexes start at 0. The default is 'auto'.
|
|
|
|
The default value is to let libopenmpt choose.
|
|
|
|
@item layout
|
|
Set the channel layout. Valid values are 1, 2, and 4 channel layouts.
|
|
The default value is STEREO.
|
|
|
|
@item sample_rate
|
|
Set the sample rate for libopenmpt to output.
|
|
Range is from 1000 to INT_MAX. The value default is 48000.
|
|
@end table
|
|
|
|
@section mov/mp4/3gp
|
|
|
|
Demuxer for Quicktime File Format & ISO/IEC Base Media File Format (ISO/IEC 14496-12 or MPEG-4 Part 12, ISO/IEC 15444-12 or JPEG 2000 Part 12).
|
|
|
|
Registered extensions: mov, mp4, m4a, 3gp, 3g2, mj2, psp, m4b, ism, ismv, isma, f4v
|
|
|
|
@subsection Options
|
|
|
|
This demuxer accepts the following options:
|
|
@table @option
|
|
@item enable_drefs
|
|
Enable loading of external tracks, disabled by default.
|
|
Enabling this can theoretically leak information in some use cases.
|
|
|
|
@item use_absolute_path
|
|
Allows loading of external tracks via absolute paths, disabled by default.
|
|
Enabling this poses a security risk. It should only be enabled if the source
|
|
is known to be non-malicious.
|
|
|
|
@item seek_streams_individually
|
|
When seeking, identify the closest point in each stream individually and demux packets in
|
|
that stream from identified point. This can lead to a different sequence of packets compared
|
|
to demuxing linearly from the beginning. Default is true.
|
|
|
|
@item ignore_editlist
|
|
Ignore any edit list atoms. The demuxer, by default, modifies the stream index to reflect the
|
|
timeline described by the edit list. Default is false.
|
|
|
|
@item advanced_editlist
|
|
Modify the stream index to reflect the timeline described by the edit list. @code{ignore_editlist}
|
|
must be set to false for this option to be effective.
|
|
If both @code{ignore_editlist} and this option are set to false, then only the
|
|
start of the stream index is modified to reflect initial dwell time or starting timestamp
|
|
described by the edit list. Default is true.
|
|
|
|
@item ignore_chapters
|
|
Don't parse chapters. This includes GoPro 'HiLight' tags/moments. Note that chapters are
|
|
only parsed when input is seekable. Default is false.
|
|
|
|
@item use_mfra_for
|
|
For seekable fragmented input, set fragment's starting timestamp from media fragment random access box, if present.
|
|
|
|
Following options are available:
|
|
@table @samp
|
|
@item auto
|
|
Auto-detect whether to set mfra timestamps as PTS or DTS @emph{(default)}
|
|
|
|
@item dts
|
|
Set mfra timestamps as DTS
|
|
|
|
@item pts
|
|
Set mfra timestamps as PTS
|
|
|
|
@item 0
|
|
Don't use mfra box to set timestamps
|
|
@end table
|
|
|
|
@item export_all
|
|
Export unrecognized boxes within the @var{udta} box as metadata entries. The first four
|
|
characters of the box type are set as the key. Default is false.
|
|
|
|
@item export_xmp
|
|
Export entire contents of @var{XMP_} box and @var{uuid} box as a string with key @code{xmp}. Note that
|
|
if @code{export_all} is set and this option isn't, the contents of @var{XMP_} box are still exported
|
|
but with key @code{XMP_}. Default is false.
|
|
|
|
@item activation_bytes
|
|
4-byte key required to decrypt Audible AAX and AAX+ files. See Audible AAX subsection below.
|
|
|
|
@item audible_fixed_key
|
|
Fixed key used for handling Audible AAX/AAX+ files. It has been pre-set so should not be necessary to
|
|
specify.
|
|
|
|
@item decryption_key
|
|
16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
|
|
@end table
|
|
|
|
@subsection Audible AAX
|
|
|
|
Audible AAX files are encrypted M4B files, and they can be decrypted by specifying a 4 byte activation secret.
|
|
@example
|
|
ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4
|
|
@end example
|
|
|
|
@section mpegts
|
|
|
|
MPEG-2 transport stream demuxer.
|
|
|
|
This demuxer accepts the following options:
|
|
@table @option
|
|
@item resync_size
|
|
Set size limit for looking up a new synchronization. Default value is
|
|
65536.
|
|
|
|
@item skip_unknown_pmt
|
|
Skip PMTs for programs not defined in the PAT. Default value is 0.
|
|
|
|
@item fix_teletext_pts
|
|
Override teletext packet PTS and DTS values with the timestamps calculated
|
|
from the PCR of the first program which the teletext stream is part of and is
|
|
not discarded. Default value is 1, set this option to 0 if you want your
|
|
teletext packet PTS and DTS values untouched.
|
|
|
|
@item ts_packetsize
|
|
Output option carrying the raw packet size in bytes.
|
|
Show the detected raw packet size, cannot be set by the user.
|
|
|
|
@item scan_all_pmts
|
|
Scan and combine all PMTs. The value is an integer with value from -1
|
|
to 1 (-1 means automatic setting, 1 means enabled, 0 means
|
|
disabled). Default value is -1.
|
|
|
|
@item merge_pmt_versions
|
|
Re-use existing streams when a PMT's version is updated and elementary
|
|
streams move to different PIDs. Default value is 0.
|
|
@end table
|
|
|
|
@section mpjpeg
|
|
|
|
MJPEG encapsulated in multi-part MIME demuxer.
|
|
|
|
This demuxer allows reading of MJPEG, where each frame is represented as a part of
|
|
multipart/x-mixed-replace stream.
|
|
@table @option
|
|
|
|
@item strict_mime_boundary
|
|
Default implementation applies a relaxed standard to multi-part MIME boundary detection,
|
|
to prevent regression with numerous existing endpoints not generating a proper MIME
|
|
MJPEG stream. Turning this option on by setting it to 1 will result in a stricter check
|
|
of the boundary value.
|
|
@end table
|
|
|
|
@section rawvideo
|
|
|
|
Raw video demuxer.
|
|
|
|
This demuxer allows one to read raw video data. Since there is no header
|
|
specifying the assumed video parameters, the user must specify them
|
|
in order to be able to decode the data correctly.
|
|
|
|
This demuxer accepts the following options:
|
|
@table @option
|
|
|
|
@item framerate
|
|
Set input video frame rate. Default value is 25.
|
|
|
|
@item pixel_format
|
|
Set the input video pixel format. Default value is @code{yuv420p}.
|
|
|
|
@item video_size
|
|
Set the input video size. This value must be specified explicitly.
|
|
@end table
|
|
|
|
For example to read a rawvideo file @file{input.raw} with
|
|
@command{ffplay}, assuming a pixel format of @code{rgb24}, a video
|
|
size of @code{320x240}, and a frame rate of 10 images per second, use
|
|
the command:
|
|
@example
|
|
ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
|
|
@end example
|
|
|
|
@section sbg
|
|
|
|
SBaGen script demuxer.
|
|
|
|
This demuxer reads the script language used by SBaGen
|
|
@url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG
|
|
script looks like that:
|
|
@example
|
|
-SE
|
|
a: 300-2.5/3 440+4.5/0
|
|
b: 300-2.5/0 440+4.5/3
|
|
off: -
|
|
NOW == a
|
|
+0:07:00 == b
|
|
+0:14:00 == a
|
|
+0:21:00 == b
|
|
+0:30:00 off
|
|
@end example
|
|
|
|
A SBG script can mix absolute and relative timestamps. If the script uses
|
|
either only absolute timestamps (including the script start time) or only
|
|
relative ones, then its layout is fixed, and the conversion is
|
|
straightforward. On the other hand, if the script mixes both kind of
|
|
timestamps, then the @var{NOW} reference for relative timestamps will be
|
|
taken from the current time of day at the time the script is read, and the
|
|
script layout will be frozen according to that reference. That means that if
|
|
the script is directly played, the actual times will match the absolute
|
|
timestamps up to the sound controller's clock accuracy, but if the user
|
|
somehow pauses the playback or seeks, all times will be shifted accordingly.
|
|
|
|
@section tedcaptions
|
|
|
|
JSON captions used for @url{http://www.ted.com/, TED Talks}.
|
|
|
|
TED does not provide links to the captions, but they can be guessed from the
|
|
page. The file @file{tools/bookmarklets.html} from the FFmpeg source tree
|
|
contains a bookmarklet to expose them.
|
|
|
|
This demuxer accepts the following option:
|
|
@table @option
|
|
@item start_time
|
|
Set the start time of the TED talk, in milliseconds. The default is 15000
|
|
(15s). It is used to sync the captions with the downloadable videos, because
|
|
they include a 15s intro.
|
|
@end table
|
|
|
|
Example: convert the captions to a format most players understand:
|
|
@example
|
|
ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt
|
|
@end example
|
|
|
|
@section vapoursynth
|
|
|
|
Vapoursynth wrapper.
|
|
|
|
Due to security concerns, Vapoursynth scripts will not
|
|
be autodetected so the input format has to be forced. For ff* CLI tools,
|
|
add @code{-f vapoursynth} before the input @code{-i yourscript.vpy}.
|
|
|
|
This demuxer accepts the following option:
|
|
@table @option
|
|
@item max_script_size
|
|
The demuxer buffers the entire script into memory. Adjust this value to set the maximum buffer size,
|
|
which in turn, acts as a ceiling for the size of scripts that can be read.
|
|
Default is 1 MiB.
|
|
@end table
|
|
|
|
@c man end DEMUXERS
|