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.
+ fezzik
+
+ Description
+
+ A friendly giant that likes to rhyme and throw rocks
+
+ Constructor Argument
+
+ 'file' - produce a/v from file
+
+ 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.
+
ffmpeg
Description
Known Bugs
- Can be problematic with source NTSC DV files? really? yes - try
- playing pond.dv...
+ Can be problematic with some NTSC DV files?
mcmpeg
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
+ string fgcolour - an rgba colour specification of the text (i.e. 0xrrggbbaa)
+ string bgcolour - an rgba colour 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 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
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
Description
- Use ffmpeg executable to substitute audio stream.
+ Use ffmpeg executable to substitute audio stream.
Constructor Argument
Description
- Convert color image to greyscale
+ Convert colour image to greyscale
Constructor Argument
none
- resize
+ obscure
Description
- Image scaling and padding
+ Obscuring filter.
Constructor Argument
- scale - "affine" to use affine transform scaling, otherwise
- center and pad.
+ 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
Dependencies
none
-
+
Known Bugs
none
- volume
-
+ resize
+
Description
- Adjust an audio stream's volume level
+ Image scaling and padding
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
+ scale - "affine" to use affine transform scaling, otherwise
+ center and pad.
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
+ Read Only Properties
- 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
+ none
Dependencies
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
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
+
+ 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
+
+ Known Bugs
+
+ none
+
+ watermark
+
+ Description
+
+ Add a watermark to the frames.
+
+ Constructor Argument
+
+ 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
+
+ none
+
+ Dependencies
+
+ mlt core modules and optionally, fezzik
+
+ Known Bugs
+
+ none
+
Transitions
-----------
Constructor Argument
- mix - see below
+ string start - X,Y:WxH[:mix]
Initialisation Properties
+ string end - X,Y:WxH[:mix]
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
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
projects / melted / blobdiff