justjohn12345andClaude Opus 5.5 9b31f4eb84 NEST15: nested sequences in AAF and OMF, the way Premiere Pro writes them ...

A nested sequence was left out of both formats as a gap, with a report entry
telling the user to "render and replace" it first (a command FilmCraft does
not have). An AAF with nested compositions was read with gaps in their place.

What Premiere Pro 26.5.2 does, read off files it exported for a sequence with
a nest:
- AAF: the nested sequence is a composition mob of its own, and its clips are
  source clips that point at it.
- OMF: the nested sequence's sound is rendered into the document as one clip
  named after the sequence.

Export
- AAF: a nested sequence is written as a composition mob (no usage code; the
  exported sequence stays the top-level one). A clip of it is a source clip
  at that mob's first slot of the clip's kind, its start in that slot's edit
  units. Nests in nests are followed; a nest used twice is written once. With
  embedded or consolidated audio, the media of the clips inside a nest is
  prepared with the rest (`NestNeeds::Inside`).
- OMF: `audio_needs` lists the range of the nested sequence each nest clip
  plays (`NestNeeds::Render`); the engine mixes it through the export audio
  pipeline with what is on the clip, and it is written as media. Without that
  essence the nest is a gap and the report names the sequence.

Import (AAF)
- A source clip that points at a composition becomes a clip of a nested
  sequence; the composition is read once.
- Premiere Pro's layout is read: all video tracks in one slot (a nested scope
  with a segment per track; before, only the last segment was read, so a
  Premiere AAF came in with one video track), and "top-level" tagged on nested
  compositions too (top-level are those no other composition uses).
- A composition without a frame size takes that of the first picture it
  shows, not of the first picture in the file.

A sequence that claims to be inside itself is a gap with a report entry in
both directions; the walks are bounded (16 levels).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-06 20:53:34 -04:00

..

src

NEST15: nested sequences in AAF and OMF, the way Premiere Pro writes them

2026-10-06 20:53:34 -04:00

Cargo.toml

M11.4: AAF consolidated audio as OP-Atom MXF (audioFormat mxf) using the MXF writer

2026-10-03 07:14:32 -04:00