- Update to version 6.24.0
  Framework:
  * Trigger a `property-changed` event on 
    `mlt_properties_pass_list`.
  * Fixed using a video transition with a video clip on an audio 
    track.
  * Reduce the amount of service caching to 2X #tracks to reduce 
    memory usage.
  Modules:
  * Added the `pillar_echo` filter to the plus module.
  * Added a `qtcrop` filter to the qt module.
  * Added `html`, `resource`, `overflow-y`, and `_hide` 
    properties to the `qtext` filter for rich text.
  * Added the filter `choppy` to the core module.
  * Added slice threading to the `brightness` filter.
  * Fixed compiling with OpenCV 4.
  * Fixed the colors when using `mlt_image_format=rgb24a` with 
    `avformat` consumer.
  * Fixed a possible crash in the `timewarp` producer on sources 
    with non-integer frame rates.
  * Fixed a regression in version 6.22 with multiple affine 
    filters at the same time.
  * Fixed possible abort or deadlock on recursive pthread 
    mutexes in `avformat` producer.
  * Fixed a crash in `crop` filter with large `center_bias` 
    value when `use_profile` is 1.
  * Fixed a white video frame appearing on threaded rendering in 
    `freeze` filter.
  * Fixed MLT XML DRD to permit empty playlists, which may occur 
    on empty tracks in a multitrack.
  * Fixed initializing QApplication in the `qimage` producer.
  * Fixed interpolation when scaling with the `affine` rect and 
    geomety properties.
  * Fixed high memory usage with high factors of pitch shifting 
    in the `rbpitch` filter.
  * Fixed a crash on files with more than 32 streams in the 
    `avformat` producer.
  Other:
  * Added the Python binding to the CMake build.
  * Added the `sdl` (v1) module to the CMake build.
  * Removed minrate and maxrate from the `webm` avformat 
    consumer preset.

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