Hi Apple Developer Forums and Final Cut Pro team, I am developing a Final Cut Pro Workflow Extension focused on speech-to-text / subtitle recognition and generation. The extension runs inside Final Cut Pro, analyzes clips, generates accurate subtitles (often hundreds of individual elements), and allows users to drag the generated subtitles directly back into the FCP timeline as a clean, editable Compound Clip or Storyline. We are implementing this drag-and-drop functionality using the official pasteboard mechanism (com.apple.finalcutpro.xml and versioned types such as com.apple.finalcutpro.xml.v1-10). While the high-level documentation is helpful: Supporting Drag and Drop for Data Sent to Final Cut Pro FCPXML Reference Designing Workflow Extensions There is still no detailed public specification for the exact internal XML structure that Final Cut Pro expects for a drag operation to reliably result in a usable Compound Clip (or direct Storyline insertion), especially when dealing with large numbers of subtitle
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