Producers --------- avformat Description ffmpeg libavformat based producer for video and audio. Constructor Argument 'file' - producer a/v from file Initialisation Properties int video_index - index of video stream to use (-1 is off) int audio_index - index of audio stream to use (-1 is off) int in - in point int out - out point Read Only Properties double fps - this is fixed at 25 for PAL currently double aspect_ratio - this is determined on the first 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. mpeg seeking is inaccurate - doesn't seek to i-frames so you may get junk for a few frames. ffmpeg Description Test case pipe based producer for video and audio. Constructor Argument 'file' - produce a/v from file v4l - produce a/v from video4linux and dsp device Initialisation Properties string video_type - "file" or "v4l" string video_file - file or v4l device string video_size - WxH of video to produce (default: "") int video_loop - loop video until audio exhausted (default: 0) string audio_type - "file" or "dsp" string audio_file - file or dsp device int audio_rate - audio frequency (default: 48000) int audio_channels - audio channels (default: 2) int audio_track - audio track to use (default: 0) int audio_loop - loop audio until video exhausted (default: 0) int in - in point int out - out point double fps - output frames per second (default: 25) double aspect_ratio - aspect ratio of video Read Only Properties string resource - file or "v4l" int end_of_clip - holds 1 when input is exhausted Dependencies ffmpeg executable. Known Bugs in point setting is broken. Implementation does not allow fast random access. libdv Description libdv based decoder for video and audio. Constructor Argument 'file' - produce a/v from file Initialisation Properties int in - in point int out - out point Read Only Properties 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 libdv. Known Bugs None. mcdv Description Mainconcept based dv decoder for video and audio. Constructor Argument 'file' - produce a/v from file Initialisation Properties int in - in point int out - out point Read Only Properties 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. "dv_sdk" installed parallel to mlt. Known Bugs Can be problematic with source NTSC DV files? really? yes - try playing pond.dv... mcmpeg Description Mainconcept based mpeg decoder for video and audio. Constructor Argument 'file' - produce a/v from file Initialisation Properties int in - in point int out - out point Read Only Properties string resource - file location double fps - output frames per second double aspect_ratio - aspect ratio of video Dependencies mainconcept mpeg sdk. "mpeg_sdk_demo" installed parallel to mlt. Known Bugs None. pango Description A title generator that uses the Pango international text layout and Freetype2 font renderer. 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 <, >, & Initialisation Properties int in - in point int out - out point 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 - 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 Read Only Properties string resource - the text/markup file or "pango" if no file Dependencies 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 pixbuf Description A graphics overlay generator using gdk-pixbuf Constructor Argument 'file' - The name of a graphics file loadable by 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 Initialisation Properties int in - in point int out - out point 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). Read Only Properties string resource - file location Dependencies libgdk_pixbuf-2.0, libglib-2.0, libgobject-2.0, libgmodule-2.0 Known Bugs in/out settings are incorrectly handled. ppm Description Reads a stream of contiguous PPM images. Constructor Argument command - a shell command to run something that produces ppm streams on stdout. Initialisation Properties none Read Only Properties string resource - the command Dependencies none Known Bugs Since it uses pipes, it is not compatible with bluefish. westley Description Construct a service network from an XML description. 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. A referenced producer or playlist must appear before the reference. vorbis Description OGG Vorbis file reader. Constructor Argument 'file' - file to use (only .ogg supported at the moment) Initialisation Properties int in - in point int out - out point Read Only Properties double fps - this is fixed at 25 for PAL currently Dependencies libvorbisfile Known Bugs Fixed frame size (PAL audio chunks). Doesn't cover ogg files with multiple, differing sections. Filters ------- deinterlace Description Deinterlace a frame consisting of two fields by linearly blending. Constructor Argument none Initialisation Properties int in - in point int out - out point Read Only Properties none Dependencies none Known Bugs Not a bug, but it only provides fair quality at a fair performance; i.e., it excels at neither. ffmpeg_dub Description Use ffmpeg executable to substitute audio stream. Constructor Argument file - filename of a WAV, Ogg Vorbis (--enable-vorbis), MP3 (--enable-mp3lame), or AC-3 (--enable-a52) audio file. Initialisation Properties int in - in point int out - out point Read Only Properties string resource - file Dependencies ffmpeg plus for ffmpeg: libogg and libvorbis for Ogg Vorbis, libmp3lame for MP3, liba52 for AC-3. Known Bugs Uses pipes and is therefore not compatible with bluefish. gamma Description Adjust image luma using a non-linear power-law curve Constructor Argument gamma - a floating point value Initialisation Properties int in - in point int out - out point Mutable Properties double gamma - the exponential factor of the power-law curve Dependencies none Known Bugs none greyscale Description Convert color image to greyscale Constructor Argument none Initialisation Properties int in - in point int out - out point Read Only Properties none Dependencies none Known Bugs none obscure Description Obscuring filter. Constructor Argument none Initialisation Properties string start - in the format X,Y:WxH[:PWxPY] 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 resize Description Image scaling and padding Constructor Argument scale - "affine" to use affine transform scaling, otherwise center and pad. Initialisation Properties int in - in point int out - out point Read Only Properties none Dependencies none Known Bugs none volume Description Adjust an audio stream's volume level Constructor Argument 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 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 Dependencies none Known Bugs none resample Description Adjust an audio stream's sampling rate 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. Constructor Argument interpolation - the rescaling method, one of: nearest (lowest quality, fastest), tiles, bilinear (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 Dependencies libgdk_pixbuf-2.0, libglib-2.0, libgobject-2.0, libgmodule-2.0 Known Bugs none Transitions ----------- composite Description An alpha-channel based compositor for two frames. Constructor Argument mix - see below Initialisation Properties 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 Read Only Properties none Dependencies none Known Bugs Need to add field-based rendering. luma Description A generic dissolve and wipe transition processor. It 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. Constructor Argument string resource - the luma map file name. If not supplied, a dissolve. Initialisation Properties int in - in point int out - out point Mutable Properties 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. Read Only Properties none Dependencies none Known Bugs The luma map must be the same size as the B frame. The PGM parser does not handle comments. mix Description An two stream audio mixer. Constructor Argument mix - see below Initalisation Properties int in - in point int out - out point Mutable Properties double mix - the mix level to apply to the second frame. - any negative value causes an automatic crossfade. Read Only Properties none Dependencies none Known Bugs Samples from the longer of the two frames are discarded. Consumers --------- bluefish Description BlueFish444 audio and video output module. Constructor Argument string video_standard - "PAL" (default) or "NTSC" Initialisation Properties int video_standard - 0 = PAL, 1 = NTSC Read Only Properties none Dependencies BlueVelvet SDK installed parallel to mlt in "bluefish." Known Bugs Does not work with any service that uses pipes! If mlt crashes, you must reload the BlueDriver kernel module due to unreleased DMA buffers. Needs an argument or property for multi-card address. ffmpeg Description Constructor Argument Initialisation Properties Read Only Properties Dependencies Known Bugs libdv Description libdv dv producer. Constructor Argument string video_standard - "PAL" (default) or "NTSC" Initialisation Properties Read Only Properties Dependencies Known Bugs sdl Description Simple DirectMedia Layer audio and video output module. Constructor Argument string video_standard - "PAL" (default), "NTSC", or "WxH" Mutable Properties double volume - audio level factor int video_off - if 1, disable video output int audio_off - if 1, disable audio output int scale_overlay - if 1, resample video from source pixel aspect ratio to square pixels. Read Only Properties none Dependencies libSDL-1.2, libasound, libaudio, libXt, libX11, libXext, libSM, libICE Known Bugs 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. 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.