MLT - v6.20.0 released

Feb 16, 2020

This version adds support for low resolution Preview Scaling and adds a module based on the Rubber Band Library for audio pitch-shifting. An official docker image is now available on Docker Hub as mltframework/melt.

Framework

Added consumer scaling:
- mlt_profile_scale_width()
- mlt_profile_scale_height()
- Mlt::Profile::scale_width()
- Mlt::Profile::scale_height()
- support for a double scale property to melt and the xml producer
Fixed mlt_properties_set() with an invalid expression.
Added new functions that do not evaluate expressions:
- mlt_properties_set_string()
- Mlt::Properties::set_string()
Improved the service-caching heuristic in mlt_multitrack.
Fixed possible crashes in mlt_playlist get_frame() and mlt_filter_process().

Modules

Added the rubberband module with a rbpitch filter.
Added pitch compensation to timewarp producer.
Added the invert_scale property to the affine filter and transition.
Added the reverse property to the shape filter.
Added support for text keyframes to the text and qtext filters.
Added support for the CSRT and MOSSE algorithms in opencv.tracker filter.
Fixed a crash on empty algo property in the opencv.tracker filter.
Changed vorbis module to no longer be deprecated.
Improved colorspace conversions in the avformat module.
Fixed audio artifacts on initial seek to in point in avformat producer.
Fixed the colorspace of the cached image in avformat producer.
Fixed white video flashes on property changes in the qtext filter.
Fixed a crash in the rotoscoping filter with large spline deviations.
Fixed a crash in the sdi consumer if the driver is not loaded.
Improved support for a video clip as luma producer to the luma transition.
Fixed a crash in the matte transition.
Fixed a crash when using invert property =1 in the composite transition.

Other

Added a Dockerfile and integrated docker build into Travis CI.
Added more avformat consumer presets:
- intermediate/DNxHR-HQ
- intermediate/ProRes HQ
- ALAC
- FLAC
Fixed some parameters in the XDCAM and D10 avformat presets.
Fixed link failure on some CPU architectures.

v6.20.0 released

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