Problem
A vertical repurpose uses keyframed crop positions from an earlier edit version, so later changes to the horizontal timeline are not reflected in the derived framing.
Solution
Root Cause / Diagnostic:
Duplicating a horizontal sequence into an independent vertical project breaks timeline asset referencing. When downstream editorial trims, clip replacements, or timing adjustments are made to the master horizontal timeline, the disconnected vertical sequence retains stale keyframes and out-of-sync framing offsets. This decoupling causes misaligned edits and broken narrative timing in repurposed exports.
Actionable Step-by-Step Fix:
1. Nest Master Sequences into Vertical Timelines: Embed the master 16:9 edit as a nested sequence or compound clip inside the 9:16 timeline rather than copying raw cut clips.
2. Apply Framing to Nested Sequence Slices: Blade the nested sequence only at major framing shifts, allowing internal horizontal edits and audio updates to ripple through dynamically.
3. Establish Version-Controlled Edit Passes: Finalize picture lock on the horizontal master before executing the vertical reframe pass to ensure edit synchronization.
Pro Creator Tip:
Use nested sequences with timecode burns during multi-format workflows; any late trim in the master sequence automatically propagates across all aspect-ratio derivations without manual re-keyframing.
Duplicating a horizontal sequence into an independent vertical project breaks timeline asset referencing. When downstream editorial trims, clip replacements, or timing adjustments are made to the master horizontal timeline, the disconnected vertical sequence retains stale keyframes and out-of-sync framing offsets. This decoupling causes misaligned edits and broken narrative timing in repurposed exports.
Actionable Step-by-Step Fix:
1. Nest Master Sequences into Vertical Timelines: Embed the master 16:9 edit as a nested sequence or compound clip inside the 9:16 timeline rather than copying raw cut clips.
2. Apply Framing to Nested Sequence Slices: Blade the nested sequence only at major framing shifts, allowing internal horizontal edits and audio updates to ripple through dynamically.
3. Establish Version-Controlled Edit Passes: Finalize picture lock on the horizontal master before executing the vertical reframe pass to ensure edit synchronization.
Pro Creator Tip:
Use nested sequences with timecode burns during multi-format workflows; any late trim in the master sequence automatically propagates across all aspect-ratio derivations without manual re-keyframing.