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.
+ 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
+ get junk for a few frames.
+
ffmpeg
Description
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)
- timecode in - in point
- timecode out - out point
+ int in - in point
+ int out - out point
double fps - output frames per second (default: 25)
double aspect_ratio - aspect ratio of video
Initialisation Properties
- timecode in - in point
- timecode out - out point
+ int in - in point
+ int out - out point
Read Only Properties
string resource - file location
- double fps - output frames per second
+ double fps - output frames per second
double aspect_ratio - aspect ratio of video]
- timecode length - duration of resource (in seconds)
+ int length - duration of resource (in frames)
Dependencies
Initialisation Properties
- timecode in - in point
- timecode out - out point
+ int in - in point
+ int out - out point
Read Only Properties
string resource - file location
- double fps - output frames per second
+ double fps - output frames per second
double aspect_ratio - aspect ratio of video
- timecode length - duration of resource (in seconds)
+ int length - duration of resource (in frames)
Dependencies
Initialisation Properties
- timecode in - in point
- timecode out - out point
+ int in - in point
+ int out - out point
Read Only Properties
string resource - file location
- double fps - output frames per second
+ double fps - output frames per second
double aspect_ratio - aspect ratio of video
Dependencies
None.
pango
-
+
Description
A title generator that uses the Pango international text layout
Initialisation Properties
- timecode in - in point
- timecode out - out point
+ 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
Initialisation Properties
- timecode in - in point
- timecode out - out point
+ int in - in point
+ int out - out point
Mutable Properties
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.
+
+ 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
- Read Only 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
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
+
+ volume - a floating point value of the factor
+
+ Initialisation Properties
+
+ int in - in point
+ int out - out point
+
+ Mutable Properties
+
+ double volume - the factor applied to each sample
+
+ 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
+
Transitions
-----------
Constructor Argument
- none
+ 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
Constructor Argument
string file - the luma map file name. If not supplied, a dissolve.
+
+ Initialisation Properties
+ int in - in point
+ int out - out point
+
Mutable Properties
string filename - same as above
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
---------
Constructor Argument
- int video_standard - 0 = PAL, 1 = NTSC
+ string video_standard - "PAL" (default) or "NTSC"
Initialisation Properties
- int video_standard - see above
+ int video_standard - 0 = PAL, 1 = NTSC
Read Only Properties
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
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.
projects / mlt / blobdiff