• Fixed GoPro pre-Hero 10 LRV files not exactly 16:9.
• Fixed export to MP4 or MOV may not give constant frame rate (broke in v21.09.20).
• Fixed Export > Reset did not deselect a preset.
• Changed Ctrl+Shift+V in Text: Simple to paste.
• Changed the color of an alert vs. the proxy/preview-scaling status messages.
• Increased the time for some messages, and added the ability to click a message to dismiss it.
• Upgraded FFmpeg to version 4.4.
• Added help message boxes to the Mask: Simple Shape, Mask: From File, and Text: Rich filters.
• Added Properties > Comments for color clips.
• Added a Mask: Chroma Key filter for convenience, for example secondary color correction.
• Added support for multiple selected clips to the timeline Cut, Copy, Paste, Overwrite, and Append
  operations.
  Copy exclusively uses the system clipboard in this mode and does not show in the Source player.
• Added Markers to the Timeline!
  • Click toolbar button or press M the first time to add a marker at the playhead (current position) with no dialog.
  • Markers appear in the time ruler/track/row at the top of the Timeline.
  • A marker shows a tool tip with its name and time when you hover the mouse over it.
  • Click a marker to seek to it.
  • Click toolbar button or press M when the playhead is on the exact start time of a marker to open the Edit dialog where you can change the name, color, start, and end times.
  • A color change is remembered for all new markers until changed.
  • Right-click a marker to open its context menu to Edit or Delete a marker.
  • Press Ctrl+Alt+M when the playhead is on the exact start start time of a marker to Delete it.
  • Drag a marker to move it.
  • Ctrl+drag (command on macOS) a marker to changes its duration (a marker with a duration longer than one
    frame is also called a Range).
  • Export > From lists all Ranges.
  • Markers are saved to the project file and reloaded with the project XML in a <properties name="shotcut:markers"> element.
  • Marker operations support Undo and Redo.