+SERVICES
+--------
+
+Services marked as "(Proprietary)" are not distributed with the GPL version
+of mlt.
+
Producers
---------
Read Only Properties
+ string resource - file location
double fps - this is fixed at 25 for PAL currently
- double aspect_ratio - this is determined on the first frame read
+ double source_fps - the framerate of the resource
+ double aspect_ratio - sample aspect ratio of the resource
+ - this is determined on every frame read
Dependencies
ffmpeg must be configured as --enable-shared and installed prior
to compilation of mlt.
- Oddities
-
- There seems to be a discrepancy between audio and video pts (time
- stamps) which causes audio seeking to be unreliable in some cases.
- If audio playback is broken, try adding discrepancy=3 as a
- property.
-
- Not sure of the exact reasons, but am investigating.
-
Known Bugs
- Fixed frame rate.
Audio sync discrepancy with some content.
Not all libavformat supported formats are seekable.
- ogg is currently broken.
- Multiple mp3 uses in a single instance causes crash (patch
- available on request - submitted to ffmpeg mailing list).
- mpeg seeking is inaccurate - doesn't seek to i-frames so you may
+ Ogg Vorbis is currently broken.
+ MPEG seeking is inaccurate - doesn't seek to i-frames so you may
get junk for a few frames.
+ RAW DV seeking not supported.
- ffmpeg
+ fezzik
+
+ Description
+
+ A friendly giant that likes to rhyme and throw rocks
+
+ Constructor Argument
+
+ 'file' - produce a/v from file
+ - can also be the name of a producer service that can
+ accept the resource specified post construction.
+
+ Initialisation Properties
+
+ int in - in point
+ int out - out point
+ + all producer initialising properties
+
+ Read Only Properties
+
+ string resource - file location
+ + all producer read only properties
+
+ Details
+
+ This producer is has two roles:
+
+ 1. it handles the mappings of all file names to the other
+ producers;
+ 2. it attaches normalising filters (rescale, resize and resample)
+ to the producers (when necessary).
+
+ This producer simplifies many aspects of use. Essentially, it
+ ensures that a consumer will receive images and audio precisely as
+ they request them.
+
+ Dependencies
+
+ all.
+
+ Known Bugs
+
+ None.
+
+
+ colour
+
+ Description
+
+ A simple colour generator.
+
+ Constructor Argument
+
+ colour - A colour value is a hexadecimal representation of RGB plus
+ alpha channel as 0xrrggbbaa.
+ - Also colours can be the words: white, black, red, green,
+ or blue.
+ - The default colour is black.
+
+ Initialisation Properties
+
+ none
+
+ Read Only Properties
+
+ none
+
+ Dependencies
+
+ none
+
+ Known Bugs
+
+ none
+
+
+ ffmpeg (DEPRECATED)
Description
string resource - file location
double fps - output frames per second
- double aspect_ratio - aspect ratio of video]
int length - duration of resource (in frames)
+
+ Mutable Properties
+
+ string quality - one of "best," "fast" or anything else chooses
+ medium.
Dependencies
Known Bugs
- None.
+ DVCPRO is incorrectly identified as 16:9 aspect ratio. You must use
+ libdv from CVS or a post 0.101 release.
- mcdv
+ mcdv (Proprietary)
Description
- Mainconcept based dv decoder for video and audio.
+ MainConcept based dv decoder for video and audio.
Constructor Argument
string resource - file location
double fps - output frames per second
- double aspect_ratio - aspect ratio of video
int length - duration of resource (in frames)
Dependencies
- mainconcept dv sdk and libdv.
+ MainConcept DV or DVCPRO SDK, libdv.
"dv_sdk" installed parallel to mlt.
Known Bugs
- Can be problematic with source NTSC DV files? really? yes - try
- playing pond.dv...
+ None
- mcmpeg
+ mcmpeg (Proprietary)
Description
- Mainconcept based mpeg decoder for video and audio.
+ MainConcept based mpeg decoder for video and audio.
Constructor Argument
string resource - file location
double fps - output frames per second
- double aspect_ratio - aspect ratio of video
-
+ double aspect_ratio - sample aspect ratio of video
+ int length - duration of resource (in frames)
+
Dependencies
- mainconcept mpeg sdk.
- "mpeg_sdk_demo" installed parallel to mlt.
+ MainConcept MPEG SDK.
+ "mpeg_sdk_release" installed parallel to mlt.
Known Bugs
Constructor Argument
string file - a text file containing Pango markup, see:
- http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html
- - requires xml-like encoding special chars: <, >, & to <, >, &
+ http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html
+ - requires xml-like encoding special chars from:
+ <, >, & -to- <, >, &
+
+ Details
+
+ Supplying a filename with extension ".txt" causes the Fezzik
+ producer to load with pango. If the filename begins with "+" the
+ pango producer interprets the filename as pango text. This is a
+ shortcut to embed titles in inigo commands. For westley, it is
+ recommended that you embed the title text in the property value.
+ If you need to embed Pango markup in a westley XML file, then
+ enclose the value inside "<![CDATA[ ... ]]>".
+
+ Pango has builtin scaling. It will rescale the originally rendered
+ title to whatever the consumer requests. Therefore, it will lose
+ its aspect ratio if so requested, and it is up to the consumer to
+ request a proper width and height that maintains the image aspect.
Initialisation Properties
Mutable Properties
- int video_standard - enum mlt_video_standard from mlt_frame.h
- PAL = 0, NTSC = 1
- this determines proper pixel aspect ratio
-
- string markup - a string containing Pango markup see:
- http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html
- - requires xml-like encoding special chars: <, >, & to <, >, &
-
- int fgcolor - an rgba color specification of the text (i.e. 0xrrggbbaa)
- int bgcolor - an rgba color of the background rectangle
- int align - paragraph alignment: 0 = left, 1 = center, 2 = right
- int pad - the number of pixels to pad the background rectangle beyond edges of text
- default 0
+ string markup - a UTF-8 string containing Pango markup see:
+ http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html
+ - requires xml-like encoding special chars from:
+ <, >, & -to- <, >, &
+ string fgcolour - an RGBA colour specification of the text
+ (i.e. 0xrrggbbaa)
+ string bgcolour - an RGBA colour of the background rectangle
+ string align - paragraph alignment: left, centre, right
+ - also, numbers 0, 1 and 2 can be used respectively.
+ int pad - the number of pixels to pad the background rectangle
+ beyond edges of text. default 0.
string markup - see constructor argument
- string text - non-markup text (can contain markup chars un-encoded)
- string font - the default typeface to use when not using markup
- default "Sans 48"
- int x - the horizontal position of the title on the frame
- default 0
- int y - the vertical position of the title on the frame
- default 0
- double mix - the overall opacity control of the generated title
- default 1.0
+ string text - non-markup string in UTF-8 encoding (can contain
+ markup chars un-encoded)
+ string font - the default typeface to use when not using markup.
+ default "Sans 48". FreeType2 renders at 72 dpi.
Read Only Properties
- string resource - the text/markup file or "pango" if no file
+ string resource - the text/markup file or "pango" if no file.
+ int real_width - the original, unscaled width of the rendered title.
+ int real_height - the original, unscaled height of the title.
+ int width - the last requested scaled image width.
+ int height - the last requested scaled image height.
Dependencies
- libpango-1.0, libpangoft2-1.0, libfreetype, libgdk_pixbuf-2.0, libglib-2.0,
- libgobject-2.0, libgmodule-2.0, libfontconfig
+ libpango-1.0, libpangoft2-1.0, libfreetype, libgdk_pixbuf-2.0,
+ libglib-2.0, libgobject-2.0, libgmodule-2.0, libfontconfig.
Known Bugs
- no frame-alignment functionality
+ The foreground and background Pango markup span attributes are not
+ supported.
+ Word wrapping is not supported.
pixbuf
Description
- A graphics overlay generator using gdk-pixbuf
+ A still graphics to video generator using gdk-pixbuf
Constructor Argument
a gdk-pixbuf loader. see /usr/lib/gdk-pixbuf/loaders
definitely png, jpeg, tiff, pnm, and xpm
- If "%" in filename, the filename is used with sprintf
- generate a filename from a counter for multi-file/flipbook animation.
- The file sequence ends when numeric discontinuity >100.
- - If filename contains "/.all.", suffix with an extension to load
- all pictures with matching extension from a directory
+ generate a filename from a counter for multi-file/flipbook
+ animation. The file sequence ends when numeric
+ discontinuity >100.
+ - If filename contains "/.all.", suffix with an extension to
+ load all pictures with matching extension from a directory.
+ - If filename contains the string "<svg", then pixbuf tries
+ to load the filename as inline SVG XML, which is convenient
+ for inigo commands. For westley XML, set the resource
+ property value with inline XML embedded using a CDATA node
+ ("<![CDATA[ ... ]]>").
+
+ Details
+
+ Pixbuf has builtin scaling. It will rescale the originally rendered
+ title to whatever the consumer requests. Therefore, it will lose
+ its aspect ratio if so requested, and it is up to the consumer to
+ request a proper width and height that maintains the image aspect.
Initialisation Properties
Mutable Properties
- int video_standard - enum mlt_video_standard from mlt_frame.h
- PAL = 0, NTSC = 1
- this determines proper pixel aspect ratio
- double ttl - how long (seconds) to repeat each picture in file sequences
- int x - the horizontal offset from the left edge of the frame
- int y - the vertical offset from the top edge of the frame
- double mix - the opacity factor to apply to the second frame
- (used in addition to alpha channel).
-
+ int ttl - how long (in frames) to repeat each picture in file
+ sequences. default is 25.
Read Only Properties
- string resource - file location
+ string resource - file location. See Constructor Argument above.
+ int real_width - the original, unscaled width of the rendered title.
+ int real_height - the original, unscaled height of the title.
+ int width - the last requested scaled image width.
+ int height - the last requested scaled image height.
Dependencies
- libgdk_pixbuf-2.0, libglib-2.0, libgobject-2.0, libgmodule-2.0
+ libgdk_pixbuf-2.0, libglib-2.0, libgobject-2.0, libgmodule-2.0
Known Bugs
- in/out settings are incorrectly handled.
+ XXX: in/out settings are incorrectly handled.
ppm
Since it uses pipes, it is not compatible with bluefish.
+ westley
+
+ Description
+
+ Construct a service network from an XML description.
+ See docs/westley.txt.
+
+ Constructor Argument
+
+ file - an XML text file containing westley XML (schema pending)
+
+ Read Only Properties
+
+ string resource - file location
+
+ Dependencies
+
+ libxml2
+
+ Known Bugs
+
+ Non-referenced producers and playlists are not destroyed until the
+ network is destroyed.
+ A referenced producer or playlist must appear before the reference.
+ A filter that occurs before a producer has been defined causes a
+ segfault.
+
vorbis
Description
Fixed frame size (PAL audio chunks).
Doesn't cover ogg files with multiple, differing sections.
-
Filters
-------
+ brightness
+
+ Description
+
+ Shift the luma component using a constant value.
+
+ Constructor Argument
+
+ start - the constant floating point numeric value to apply.
+ - the default is 0.
+
+ Initialisation Properties
+
+ int in - in point
+ int out - out point
+ double start - see Constructor Argument above.
+ double end - the ending adjustment value. the filter interpolates
+ between the start and end adjustments over the
+ duration of the effect.
+
+ Read Only Properties
+
+ none
+
+ Dependencies
+
+ none
+
+ Known Bugs
+
+ Does not go completely to black or white.
+
+
deinterlace
Description
- Deinterlace a frame consisting of two fields by linearly blending.
+ Deinterlace a frame consisting of two fields using bob, weave,
+ greedy, one-field, and linear blend methods. This code is
+ appropriated from the Xine XV video output plugin.
Constructor Argument
- none
+ method - a string containing the deinterlace method: bob, weave,
+ greedy, onefield, or linearblend. The default is
+ linearblend.
Initialisation Properties
int in - in point
int out - out point
-
+
Read Only Properties
none
+ Mutable Properties
+
+ string method
+
+ Details
+
+ If the frame properties "progressive" or "consumer_progressive"
+ are non-zero, then the filter is not applied. Also, if applied,
+ this sets the frame property "progressive" to 1.
+
Dependencies
none
Known Bugs
- Not a bug, but it only provides fair quality at a fair performance;
- i.e., it excels at neither.
+ Not a bug, but it only provides fair quality.
+
ffmpeg_dub
Description
- Use ffmpeg executable to substitute audio stream.
+ Use ffmpeg executable to substitute audio stream.
Constructor Argument
Known Bugs
Uses pipes and is therefore not compatible with bluefish.
+
gamma
Constructor Argument
- gamma - a floating point value
+ gamma - a floating point value. The default is 1.0, or none.
Initialisation Properties
Known Bugs
none
+
greyscale
Description
- Convert color image to greyscale
+ Convert colour image to greyscale
Constructor Argument
none
+ luma
+
+ Description
+
+ Applies a luma transition between the current and next frames.
+ Useful for transitions from a slideshow created using producer
+ pixbuf.
+
+ Constructor Argument
+
+ file - a luma wipe
+
+ Initialisation Properties
+
+ int in - in point
+ int out - out point
+
+ Read Only Properties
+
+ none
+
+ Mutable Properties
+
+ int period - how long to wait between success iterations of the
+ transition. For best results set this to a multiple
+ of ttl used in pixbuf. The default is 24.
+
+ luma. - all properties beginning with "luma." are passed to the
+ encapsulated luma transition. For example, luma.out controls
+ the duration of the wipe.
+
+ Dependencies
+
+ transition_luma and its dependencies
+
+ Known Bugs
+
+ none
+
+
+ obscure
+
+ Description
+
+ Obscuring filter.
+
+ Constructor Argument
+
+ none
+
+ Initialisation Properties
+
+ string start - in the format X,Y:WxH[:PWxPY]
+ - PWxPY is the size of the averaging region in pixels.
+ string end - in the format X,Y:WxH[:PWxPY]
+ int in - in point
+ int out - out point
+
+ Read Only Properties
+
+ none
+
+ Dependencies
+
+ none
+
+ Known Bugs
+
+ none
+
+ region
+
+ Description
+
+ Apply one or filters to a region of the video image. The region
+ can be shaped as well using the alpha channel of another producer.
+
+ Constructor Argument
+
+ file - A file whose alpha channel will "shape" the region.
+ - The string "circle" is a shortcut but it requires pixbuf with
+ the librsvg loader. The circle is automatically stretched
+ to the region to create an ellipse.
+
+ Initialisation Properties
+
+ int in - in point
+ int out - out point
+ plus and region transition properties
+
+ Read Only Properties
+
+ see the region transition
+
+ Dependencies
+
+ transition_region
+
+ Known Bugs
+
+ "circle" is unpredictable in the absence of the librsvg pixbuf loader.
+
+
+ resample
+
+ Description
+
+ Adjust an audio stream's sampling rate.
+ This filter is automatically invoked by Fezzik for the sake of
+ normalisation over inputs and with the consumer.
+
+ Constructor Argument
+
+ frequency - a numeric value for the new sample rate
+
+ Initialisation Properties
+
+ int in - in point
+ int out - out point
+
+ Mutable Properties
+
+ int frequency - the target sample rate
+
+ Dependencies
+
+ libresample
+
+ Known Bugs
+
+ none
+
+ rescale
+
+ Description
+
+ Scale the producer video frame size to match the consumer.
+ This filter is automatically invoked by Fezzik in order to normalise
+ sample aspect ratio.
+
+ Constructor Argument
+
+ interpolation - the rescaling method, one of:
+ nearest (lowest quality, fastest),
+ tiles,
+ bilinear (default; good quality, moderate speed),
+ hyper (best quality, slowest).
+
+ Initialisation Properties
+
+ int in - in point
+ int out - out point
+
+ Mutable Properties
+
+ string interpolation - see constructor argument above
+
+ If a property "consumer_aspect_ratio" exists on the frame, then
+ rescaler normalises the producer's aspect ratio and maximises the
+ size of the frame, but may not produce the consumer's requested
+ dimension. Therefore, this option works best in conjunction with the
+ resize filter. This behavior can be disabled by another service by
+ either removing the property, setting it to zero, or setting
+ frame property "distort" to 1.
+
+ Dependencies
+
+ libgdk_pixbuf-2.0, libglib-2.0, libgobject-2.0, libgmodule-2.0
+
+ Known Bugs
+
+ none
+
resize
Description
- Image scaling and padding
+ Image scaling and padding and field order adjustment.
+
+ Details
+
+ Normally resize is used to pad the producer's
+ output to what the consumer has requested after an upstream rescale
+ filter first scales the image to maximise usage of the image area.
+ This filter also adjusts the field order to lower field first
+ if the frame property "top_field_first" has been set to 1.
+ Therefore, when done, it sets the top_field_first to 0.
+ This filter is automatically invoked by Fezzik as part of image
+ sample aspect ratio normalisation.
Constructor Argument
Known Bugs
- none
+ Assumes lower field first output.
volume
Constructor Argument
- volume - a floating point value of the factor
+ gain - a string containing one of:
+ - a floating point value of the gain adjustment
+ - a numeric value with the suffix "dB" to adjust in terms of decibels
+ - "normalise" to normalise the volume to the target amplitude -12dBFS
Initialisation Properties
int in - in point
int out - out point
+ int window - the number of video frames over which to smooth normalisation.
+ defaults to 75.
Mutable Properties
- double volume - the factor applied to each sample
+ string gain - same as constructor argument above
+
+ string normalise - normalise the volume to the amplitude:
+ - a numeric value with the suffix "dB" to set amplitude in decibels
+ - a floating point value of the relative volume
+ - an unspecified value uses the default -12dBFS
+
+ string limiter - limit all samples above:
+ - a numeric value with the suffix "dB"
+ - a floating point value ( dB = 20 * log10(x) )
+ - an unspecified value uses the default -6dBFS
+
+ double max_gain - a floating point or decibel value of the maximum gain that
+ can be applied during normalisation.
+ - an unspecified value uses the default 20dB
+
+ string end - a gain value just like the gain property above.
+ This causes the gain to be interpolated from 'gain' to 'end'
+ over the duration.
+
+ int window - the size of the normalising smoothing buffer in video frame units.
+ - the smoothing buffer prevents erratic gain changes.
+ - the default value is 75 video frames.
+
+ gain can be applied as a factor to the normalise amplitude!
Dependencies
none
- resample
+ watermark
Description
- Adjust an audio stream's sampling rate
+ Add a watermark to the frames.
Constructor Argument
- frequency - a numeric value for the new sample rate
+ resource - the producer to use (ie: a .png)
Initialisation Properties
+ string resource - the producer to use
+ string factory - producer required for the resource ('fezzik')
+ string geometry - composite geometry
+ string distort - control scaling
int in - in point
int out - out point
Mutable Properties
- int frequency - the target sample rate
+ none
Dependencies
- libresample
+ mlt core modules and optionally, fezzik
Known Bugs
Description
- An alpha-channel based compositor for two frames.
+ A key-framable alpha-channel compositor for two frames.
+
+ Details
+
+ Performs dissolves and luma wipes in addition to alpha compositing.
+
+ By default, the aspect ratio of the B frame is respected and the
+ size portion of the geometry specification simply defines a
+ bounding rectangle.
+
+ This performs field-based rendering unless the A frame property
+ "progressive" or "consumer_progressive" or the transition property
+ "progressive" is set to 1.
Constructor Argument
- mix - see below
+ string start - a geometry specification as X,Y:WxH[!][:mix]
+ - X, Y, W, H are assumed to pixel units unless they
+ have the suffix '%'
+ - '!' is a shortcut to specify distort, see below.
+ - mix is always a 2 digit percentage, defaults to 100.
+ - default is "85%,5%:10%x10%"
Initialisation Properties
+ string end - the ending size and position.
+ string key[F] - X,Y:WxH[:mix] - set a key frame for geometry between
+ the in and out. F is a frame number and can be
+ negative to make it relative to the out point.
int in - in point
int out - out point
-
- Mutable Properties
-
- int x - the horizontal offset from the left edge of the frame
- int y - the vertical offset from the top edge of the frame
- double mix - the opacity factor to apply to the second frame
- (used in addition to alpha channel).
- - any negative value causes an automatic dissolve
-
+ string factory - The name of a factory service used as a non-PGM
+ producer loader. The default is fezzik.
+
Read Only Properties
none
-
+
+ Mutable Properties
+
+ int progressive - set to 1 to disable field-based rendering.
+ string distort - when set, causes the B frame image to fill the WxH
+ completely with no regard to B's aspect ratio.
+ string halign - when not distorting, set the horizontal alignment
+ of B within the geometry rectangle.
+ - one of: left (0), centre (1), or right (2).
+ - the default is left.
+ string valign - when not distorting, set the vertical alignment of
+ B within the geometry rectangle.
+ - one of: top (0), middle (1), or bottom (2).
+ - the default is top.
+ string luma - the luma map file name. If not supplied, a dissolve.
+ double softness - only when using a luma map, how soft to make the
+ edges between A and B. 0.0 = no softness. 1.0 =
+ too soft.
+ Any property starting with "luma." is passed to the non-PGM luma
+ producer.
+
Dependencies
none
Known Bugs
- Need to add field-based rendering.
+ Assumes lower field first during field rendering.
luma
Description
- A generic dissolve and wipe transition processor. It gets its name
+ A generic dissolve and wipe transition processor.
+
+ Details
+
+ luma gets its name
from how it uses a grayscale "map" file. As the luma value varies
over time, a threshold filter is applied to the map to determine
- what parts of frame A vs. frame B to show. It only reads PGM
- files, but it does handle 16 bit PGM. This performs field-based
- rendering.
+ what parts of frame A vs. frame B to show. It reads PGM files
+ up to 16 bits! Alternatively, it can use the first frame from any
+ producer that outputs yuv, but it will be limited to the luma
+ gamut of 220 values.
+ This performs field-based rendering unless the A frame property
+ "progressive" or "consumer_progressive" or the transition property
+ "progressive" is set to 1.
Constructor Argument
- string file - the luma map file name. If not supplied, a dissolve.
+ string resource - the luma map file name - either PGM or any other
+ producable video.
+ - If not supplied, a dissolve.
Initialisation Properties
int in - in point
int out - out point
+ string factory - The name of a factory service used as a non-PGM
+ producer loader. The default is Fezzik.
Mutable Properties
- string filename - same as above
+ string resource - same as above
double softness - only when using a luma map, how soft to make the
edges between A and B. 0.0 = no softness. 1.0 =
too soft.
+ Any property starting with "producer." is passed to the non-PGM luma
+ producer.
Read Only Properties
none
Known Bugs
-
- The luma map must be the same size as the B frame.
- The PGM parser does not handle comments.
+
+ Assumes lower field first output.
mix
Constructor Argument
- mix - see below
+ start - see below
Initalisation Properties
Mutable Properties
- double mix - the mix level to apply to the second frame.
- - any negative value causes an automatic crossfade.
+ double start - the mix level to apply to the second frame.
+ - any negative value causes an automatic crossfade from 0 to 1.
+ double end - the ending value of the mix level. mix level will be interpolated
+ from start to end over the in-out range.
+ int reverse - set to 1 to reverse the direction of the mix.
Read Only Properties
Known Bugs
Samples from the longer of the two frames are discarded.
+
+
+ region
+
+ Description
+
+ Apply zero or more filters to B frame as it is composited onto
+ a region of the A frame. The "shape" of the region can be defined
+ by the alpha channel of a third producer.
+
+ Constructor Argument
+
+ resource - a shape producer
+
+ Initialisation Properties
+
+ string resource - nothing is rectangle, "circle" is a pixbuf-
+ generated SVG circle, anything else is loaded by the factory.
+ string factory - the service that creates the shape producer.
+ - the default is fezzik.
+ string filter[N] - one or more filters to apply. All filter
+ properties are passed using the same filter "key"
+ Any property starting with "composite." is passed to the
+ encapsulated composite transition.
+
+ Read Only Properties
+
+ none
+
+ Dependencies
+
+ transition_composite
+
+ Known Bugs
+
+ none
+
Consumers
---------
- bluefish
+ bluefish (Proprietary)
Description
Constructor Argument
- string video_standard - "PAL" (default) or "NTSC"
+ string target
Initialisation Properties
+
+ int buffer
+ string rescale
+
Read Only Properties
+
+ none
+
Dependencies
+
+ libdv
+
Known Bugs
+
+ none
sdl
NTSC handling needs tightening up - sdl:NTSC is the only valid
constructor for NTSC playback at the moment.
+ westley
+
+ Description
+
+ Serialise the service network to XML.
+ See docs/westley.txt for more information.
+
+ Constructor Argument
+
+ resource - the name of a file in which to store the XML.
+ stdout is used if not supplied.
+
+ Initialisation Properties
+
+ string resource - same as above.
+
+ Dependencies
+
+ libxml2
+
+ Known Bugs
+
+ Untested arbitrary nesting of multitracks and playlists.
+ Property "id" is generated as service type followed by number if
+ no property named "id" exists, but it fails to guarantee uniqueness.
projects / mlt / blobdiff