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Improve the ASS format subtitling support

Chengkun Chen requested to merge seri/kdenlive:work/ass-refactoring into master

Improve the ASS format subtitling feature support, mostly those supported by libass.

ASS File Format Guide by libass

  • Load & Save fontSection in the ASS format subtitle
  • Better store & manage the ASS format subtitle event by adding the SubtitleEvent class.
  • Improve the subtitle saving method to save all information in ASS Format Files.
  • Migration from V4Style to V4+Style
  • Display subtitle clips from different layers as more subtitle tracks (WIP)
  • Read & Edit with the comment event
  • Add layer management in "Subtitle Manager" widget
  • A new "Manage Subtitle Style" widget for add/delete/copy styles in the subtitle files
  • Improve the existing subtitle editor
  • Set different default styles for each subtitle track
  • Fix bugs related to undo/redo, clean up code

This is a part of Google Summer of Code 2024 project: Improved subtitling support

Related issues: #1897


Reports on Planet KDE:

Edited by Chengkun Chen

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