@chapter Demuxers
 @c man begin DEMUXERS
 

 Demuxers are configured elements in FFmpeg that can read the

 multimedia streams from a particular type of file.
 

 When you configure your FFmpeg build, all the supported demuxers

 are enabled by default. You can list all available ones using the

 configure option @code{--list-demuxers}.

 
 You can disable all the demuxers using the configure option

 @code{--disable-demuxers}, and selectively enable a single demuxer with
 the option @code{--enable-demuxer=@var{DEMUXER}}, or disable it
 with the option @code{--disable-demuxer=@var{DEMUXER}}.

 The option @code{-formats} of the ff* tools will display the list of

 enabled demuxers.
 
 The description of some of the currently available demuxers follows.
 

 @section aa
 
 Audible Format 2, 3, and 4 demuxer.
 
 This demuxer is used to demux Audible Format 2, 3, and 4 (.aa) files.
 

 @section applehttp
 
 Apple HTTP Live Streaming demuxer.
 
 This demuxer presents all AVStreams from all variant streams.
 The id field is set to the bitrate variant index number. By setting
 the discard flags on AVStreams (by pressing 'a' or 'v' in ffplay),
 the caller can decide which variant streams to actually receive.
 The total bitrate of the variant that the stream belongs to is
 available in a metadata key named "variant_bitrate".
 

 @section apng
 
 Animated Portable Network Graphics demuxer.
 
 This demuxer is used to demux APNG files.
 All headers, but the PNG signature, up to (but not including) the first
 fcTL chunk are transmitted as extradata.
 Frames are then split as being all the chunks between two fcTL ones, or
 between the last fcTL and IEND chunks.
 
 @table @option
 @item -ignore_loop @var{bool}
 Ignore the loop variable in the file if set.
 @item -max_fps @var{int}
 Maximum framerate in frames per second (0 for no limit).
 @item -default_fps @var{int}
 Default framerate in frames per second when none is specified in the file
 (0 meaning as fast as possible).
 @end table
 

 @section asf
 
 Advanced Systems Format demuxer.
 
 This demuxer is used to demux ASF files and MMS network streams.
 
 @table @option
 @item -no_resync_search @var{bool}
 Do not try to resynchronize by looking for a certain optional start code.
 @end table
 

 @anchor{concat}

 @section concat
 
 Virtual concatenation script demuxer.
 
 This demuxer reads a list of files and other directives from a text file and
 demuxes them one after the other, as if all their packet had been muxed
 together.
 
 The timestamps in the files are adjusted so that the first file starts at 0
 and each next file starts where the previous one finishes. Note that it is
 done globally and may cause gaps if all streams do not have exactly the same
 length.
 
 All files must have the same streams (same codecs, same time base, etc.).
 

 The duration of each file is used to adjust the timestamps of the next file:
 if the duration is incorrect (because it was computed using the bit-rate or
 because the file is truncated, for example), it can cause artifacts. The
 @code{duration} directive can be used to override the duration stored in
 each file.
 

 @subsection Syntax
 
 The script is a text file in extended-ASCII, with one directive per line.
 Empty lines, leading spaces and lines starting with '#' are ignored. The
 following directive is recognized:
 
 @table @option
 
 @item @code{file @var{path}}
 Path to a file to read; special characters and spaces must be escaped with
 backslash or single quotes.
 

 All subsequent file-related directives apply to that file.

 @item @code{ffconcat version 1.0}
 Identify the script type and version. It also sets the @option{safe} option
 to 1 if it was to its default -1.
 

 To make FFmpeg recognize the format automatically, this directive must
 appears exactly as is (no extra space or byte-order-mark) on the very first
 line of the script.
 

 @item @code{duration @var{dur}}
 Duration of the file. This information can be specified from the file;
 specifying it here may be more efficient or help if the information from the
 file is not available or accurate.
 

 If the duration is set for all files, then it is possible to seek in the
 whole concatenated video.
 

 @item @code{inpoint @var{timestamp}}
 In point of the file. When the demuxer opens the file it instantly seeks to the
 specified timestamp. Seeking is done so that all streams can be presented
 successfully at In point.
 
 This directive works best with intra frame codecs, because for non-intra frame
 ones you will usually get extra packets before the actual In point and the
 decoded content will most likely contain frames before In point too.
 
 For each file, packets before the file In point will have timestamps less than
 the calculated start timestamp of the file (negative in case of the first
 file), and the duration of the files (if not specified by the @code{duration}
 directive) will be reduced based on their specified In point.
 
 Because of potential packets before the specified In point, packet timestamps
 may overlap between two concatenated files.
 

 @item @code{outpoint @var{timestamp}}
 Out point of the file. When the demuxer reaches the specified decoding
 timestamp in any of the streams, it handles it as an end of file condition and
 skips the current and all the remaining packets from all streams.
 
 Out point is exclusive, which means that the demuxer will not output packets
 with a decoding timestamp greater or equal to Out point.
 
 This directive works best with intra frame codecs and formats where all streams
 are tightly interleaved. For non-intra frame codecs you will usually get
 additional packets with presentation timestamp after Out point therefore the
 decoded content will most likely contain frames after Out point too. If your
 streams are not tightly interleaved you may not get all the packets from all
 streams before Out point and you may only will be able to decode the earliest
 stream until Out point.
 
 The duration of the files (if not specified by the @code{duration}
 directive) will be reduced based on their specified Out point.
 

 @item @code{file_packet_metadata @var{key=value}}
 Metadata of the packets of the file. The specified metadata will be set for
 each file packet. You can specify this directive multiple times to add multiple
 metadata entries.
 

 @item @code{stream}
 Introduce a stream in the virtual file.
 All subsequent stream-related directives apply to the last introduced
 stream.
 Some streams properties must be set in order to allow identifying the
 matching streams in the subfiles.
 If no streams are defined in the script, the streams from the first file are
 copied.
 
 @item @code{exact_stream_id @var{id}}
 Set the id of the stream.
 If this directive is given, the string with the corresponding id in the
 subfiles will be used.
 This is especially useful for MPEG-PS (VOB) files, where the order of the
 streams is not reliable.
 

 @end table
 

 @subsection Options
 
 This demuxer accepts the following option:
 
 @table @option
 
 @item safe
 If set to 1, reject unsafe file paths. A file path is considered safe if it
 does not contain a protocol specification and is relative and all components
 only contain characters from the portable character set (letters, digits,
 period, underscore and hyphen) and have no period at the beginning of a
 component.
 
 If set to 0, any file name is accepted.
 
 The default is -1, it is equivalent to 1 if the format was automatically
 probed and 0 otherwise.
 

 @item auto_convert
 If set to 1, try to perform automatic conversions on packet data to make the
 streams concatenable.

 The default is 1.

 
 Currently, the only conversion is adding the h264_mp4toannexb bitstream
 filter to H.264 streams in MP4 format. This is necessary in particular if
 there are resolution changes.
 

 @item segment_time_metadata
 If set to 1, every packet will contain the @var{lavf.concat.start_time} and the
 @var{lavf.concat.duration} packet metadata values which are the start_time and
 the duration of the respective file segments in the concatenated output
 expressed in microseconds. The duration metadata is only set if it is known
 based on the concat file.
 The default is 0.
 

 @end table
 

 @subsection Examples
 
 @itemize
 @item
 Use absolute filenames and include some comments:
 @example
 # my first filename
 file /mnt/share/file-1.wav
 # my second filename including whitespace
 file '/mnt/share/file 2.wav'
 # my third filename including whitespace plus single quote
 file '/mnt/share/file 3'\''.wav'
 @end example
 
 @item
 Allow for input format auto-probing, use safe filenames and set the duration of
 the first file:
 @example
 ffconcat version 1.0
 
 file file-1.wav
 duration 20.0
 
 file subdir/file-2.wav
 @end example
 @end itemize
 

 @section flv
 
 Adobe Flash Video Format demuxer.
 
 This demuxer is used to demux FLV files and RTMP network streams.
 
 @table @option

 @item -flv_metadata @var{bool}

 Allocate the streams according to the onMetaData array content.
 @end table
 

 @section libgme
 
 The Game Music Emu library is a collection of video game music file emulators.
 
 See @url{http://code.google.com/p/game-music-emu/} for more information.
 
 Some files have multiple tracks. The demuxer will pick the first track by
 default. The @option{track_index} option can be used to select a different
 track. Track indexes start at 0. The demuxer exports the number of tracks as
 @var{tracks} meta data entry.
 
 For very large files, the @option{max_size} option may have to be adjusted.
 

 @section gif
 
 Animated GIF demuxer.
 
 It accepts the following options:
 
 @table @option
 @item min_delay
 Set the minimum valid delay between frames in hundredths of seconds.
 Range is 0 to 6000. Default value is 2.
 

 @item max_gif_delay
 Set the maximum valid delay between frames in hundredth of seconds.
 Range is 0 to 65535. Default value is 65535 (nearly eleven minutes),
 the maximum value allowed by the specification.
 

 @item default_delay
 Set the default delay between frames in hundredths of seconds.
 Range is 0 to 6000. Default value is 10.
 
 @item ignore_loop
 GIF files can contain information to loop a certain number of times (or
 infinitely). If @option{ignore_loop} is set to 1, then the loop setting
 from the input will be ignored and looping will not occur. If set to 0,
 then looping will occur and will cycle the number of times according to
 the GIF. Default value is 1.
 @end table
 
 For example, with the overlay filter, place an infinitely looping GIF
 over another video:
 @example
 ffmpeg -i input.mp4 -ignore_loop 0 -i input.gif -filter_complex overlay=shortest=1 out.mkv
 @end example
 
 Note that in the above example the shortest option for overlay filter is
 used to end the output video at the length of the shortest input file,
 which in this case is @file{input.mp4} as the GIF in this example loops
 infinitely.
 

 @section image2
 
 Image file demuxer.
 
 This demuxer reads from a list of image files specified by a pattern.

 The syntax and meaning of the pattern is specified by the
 option @var{pattern_type}.

 The pattern may contain a suffix which is used to automatically
 determine the format of the images contained in the files.
 
 The size, the pixel format, and the format of each image must be the
 same for all the files in the sequence.
 
 This demuxer accepts the following options:
 @table @option
 @item framerate

 Set the frame rate for the video stream. It defaults to 25.

 @item loop
 If set to 1, loop over the input. Default value is 0.
 @item pattern_type
 Select the pattern type used to interpret the provided filename.
 
 @var{pattern_type} accepts one of the following values.
 @table @option

 @item none
 Disable pattern matching, therefore the video will only contain the specified
 image. You should use this option if you do not want to create sequences from
 multiple images and your filenames may contain special pattern characters.

 @item sequence
 Select a sequence pattern type, used to specify a sequence of files
 indexed by sequential numbers.
 
 A sequence pattern may contain the string "%d" or "%0@var{N}d", which

 specifies the position of the characters representing a sequential

 number in each filename matched by the pattern. If the form
 "%d0@var{N}d" is used, the string representing the number in each
 filename is 0-padded and @var{N} is the total number of 0-padded
 digits representing the number. The literal character '%' can be
 specified in the pattern with the string "%%".
 

 If the sequence pattern contains "%d" or "%0@var{N}d", the first filename of

 the file list specified by the pattern must contain a number

 inclusively contained between @var{start_number} and

 @var{start_number}+@var{start_number_range}-1, and all the following
 numbers must be sequential.

 
 For example the pattern "img-%03d.bmp" will match a sequence of
 filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
 @file{img-010.bmp}, etc.; the pattern "i%%m%%g-%d.jpg" will match a
 sequence of filenames of the form @file{i%m%g-1.jpg},
 @file{i%m%g-2.jpg}, ..., @file{i%m%g-10.jpg}, etc.
 

 Note that the pattern must not necessarily contain "%d" or
 "%0@var{N}d", for example to convert a single image file
 @file{img.jpeg} you can employ the command:
 @example
 ffmpeg -i img.jpeg img.png
 @end example

 @item glob
 Select a glob wildcard pattern type.
 
 The pattern is interpreted like a @code{glob()} pattern. This is only
 selectable if libavformat was compiled with globbing support.
 
 @item glob_sequence @emph{(deprecated, will be removed)}
 Select a mixed glob wildcard/sequence pattern.
 
 If your version of libavformat was compiled with globbing support, and
 the provided pattern contains at least one glob meta character among
 @code{%*?[]@{@}} that is preceded by an unescaped "%", the pattern is
 interpreted like a @code{glob()} pattern, otherwise it is interpreted
 like a sequence pattern.
 
 All glob special characters @code{%*?[]@{@}} must be prefixed
 with "%". To escape a literal "%" you shall use "%%".
 
 For example the pattern @code{foo-%*.jpeg} will match all the
 filenames prefixed by "foo-" and terminating with ".jpeg", and
 @code{foo-%?%?%?.jpeg} will match all the filenames prefixed with
 "foo-", followed by a sequence of three characters, and terminating
 with ".jpeg".
 
 This pattern type is deprecated in favor of @var{glob} and
 @var{sequence}.
 @end table
 
 Default value is @var{glob_sequence}.

 @item pixel_format
 Set the pixel format of the images to read. If not specified the pixel
 format is guessed from the first image file in the sequence.
 @item start_number
 Set the index of the file matched by the image file pattern to start
 to read from. Default value is 0.

 @item start_number_range
 Set the index interval range to check when looking for the first image
 file in the sequence, starting from @var{start_number}. Default value
 is 5.

 @item ts_from_file
 If set to 1, will set frame timestamp to modification time of image file. Note
 that monotonity of timestamps is not provided: images go in the same order as
 without this option. Default value is 0.

 If set to 2, will set frame timestamp to the modification time of the image file in

 nanosecond precision.

 @item video_size
 Set the video size of the images to read. If not specified the video
 size is guessed from the first image file in the sequence.
 @end table
 

 @subsection Examples
 
 @itemize
 @item
 Use @command{ffmpeg} for creating a video from the images in the file
 sequence @file{img-001.jpeg}, @file{img-002.jpeg}, ..., assuming an
 input frame rate of 10 frames per second:

 @example

 ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv

 @end example
 

 @item

 As above, but start by reading from a file with index 100 in the sequence:
 @example

 ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv

 @end example
 

 @item
 Read images matching the "*.png" glob pattern , that is all the files
 terminating with the ".png" suffix:

 @example

 ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv

 @end example

 @end itemize

 @section mov/mp4/3gp/Quicktme
 
 Quicktime / MP4 demuxer.
 
 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.
 
 @end table
 

 @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 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.

 @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
 

 @c man end DEMUXERS