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What's new in this version:

New:
- Added a new filter Time Remap in the new Time category that affects both audio and video
- Added an Apple Silicon build
- Added an option to Ignore missing files in Export > Export File (blocking dialog added in v21.01)
- Added a suggested file name to File > Export Frame... and remembers the last chosen format. These changes make this feature more convenient
- Added a button in the Keyframes parameter track header to vertically zoom in to the minimum and maximumn values
- Added a Use Sub-clip checkbox to the Convert to Edit-friendly dialog, under Advanced. This will convert only the trimmed portion of a clip plus up to 15 seconds before the in point and after the out point for a timeline clip. When this is on, only the selected clip is replaced and not every clip based on the same source. This option is especially convenient for use with Time Remap in which case it defaults to on if the clip has been trimmed
- Added a Keep Advanced open checkbox to the Convert to Edit-friendly dialog that remembers your choice between sessions
- Added a status message tip about useful keyboard modifiers to use when dragging keyframes
- Added the display of minimum, maximum, and midpoint values to the vertical axis of curved parameters in Keyframes

Changed:
- Improved the sound quality for Properties > Pitch Compensation when Speed is between 0.5 and 2.0
- Changed Keyframes when trimming a clip or filter to move, delete, or disable full keyframes
- Upgraded FFmpeg to version 4.3.2
- Upgraded Rubberband (pitch) to version 1.9.1
- Upgraded MLT (engine) to pre-release version 7.0.0
- Improved the color accuracy of the video preview
- Converted all numeric text fields in filters to spinners
- Reduced memory in audio resampler per clip

Fixed:
- black frames in slideshow (broken in v21.02)
- Export Frame dialog reappears (broken in v21.02)
- Opacity filter may misbehave when using all smooth keyframes
- Export > Format = flac does not write a file with a duration
- using the mouse wheel over zoom sliders in Timeline and Keyframes
- an incorrect path to a file in proxy mode when the path starts with the name of a sibling folder
- converting non-animated Text: HTML to Text: Rich
- filter values do not update when moving keyframes
- waveform after adding a transition by drag a clip to the left
- showing or blank as a missing file
- a possible crash on setting Properties > Speed higher than 23x
- a possible infinite loop in Pitch audio filter or Properties > Pitch Compensation
- disabling Keyframes toolbar buttons for trim and simple keyframes if they are not supported
- a custom export preset may not include attributes of the video mod
- video glitches using multiple Text: Rich filters with Export > Video > Parallel processing
- Undo after using the ripple trim in shortcut (broken in v21.03)
- applying a custom preset for the Contrast video filter
- the Timeline ruler may be incorrect after starting a new project in the same session
- some filters may get lost after Undo a Split operation
- a context menu to Text: Simple and all numeric spinners (broken in v21.02)
- changing Properties on a timeline clip moved to another track overwrites Playlist items
- Properties > Repeat for an image sequence
- a crash changing the Size, Position & Rotate after applying a shake preset
- a possible deadlock changing Properties > Speed when Video Mode is NOT Automatic
- disabling keyboard shortcuts for disabled filter trimming and simple keyframe actions
- do not let a keyframe be placed beyond the end of a clip
- PNG and GIF as album art in music or poster image (previously only JPEG)
- Detach Audio might go to a hidden video track
- updating the clip name in Playlist and Timeline with its speed when changing Properties > Speed
- a rounding error in aspect ratio of a custom video mode that could cause problems on certain resolutions
- showing a non-functional keyboard shortcut X in the context menu for a blank region of the Timeline