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
+ fezzik
Description
- Test case pipe based producer for video and audio.
+ A friendly giant that likes to rhyme and throw rocks
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
+ + all producer initialising properties
Read Only Properties
- string resource - file or "v4l"
- int end_of_clip - holds 1 when input is exhausted
+ 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
- ffmpeg executable.
+ all.
Known Bugs
- in point setting is broken.
-
- Implementation does not allow fast random access.
+ None.
- fezzik
+ ffmpeg
Description
- A freindly giant that likes to throw rocks
+ 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 location
- double fps - output frames per second
- double aspect_ratio - aspect ratio of video]
- int length - duration of resource (in frames)
+ string resource - file or "v4l"
+ int end_of_clip - holds 1 when input is exhausted
Dependencies
- all.
+ ffmpeg executable.
Known Bugs
- None.
+ in point setting is broken.
+
+ Implementation does not allow fast random access.
libdv
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
+ 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
+
+ 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
+
volume
Description
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
-
- 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
+ mlt core modules and optionally, fezzik
Known Bugs
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