OTIO import: map ImageSequenceReference clip trims into media frame space - #308
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xSTUDIO clip active ranges are media-native file frames, but OTIO
source_range is expressed in the media reference's available_range space.
Conforms anchored to absolute timecode (EDL/CSV-derived OTIOs where
available_range.start_time is the timecode-as-frames of the first file
frame) imported with trims ~1.2M frames outside the media — every clip
displayed the wrong frames and cross-track record sync was lost.
Re-anchor ImageSequenceReference trims through start_frame:
trim = start_frame + (source_start - available_start)
This collapses to the previous verbatim behaviour whenever
available_start == start_frame (xSTUDIO/NLE exports), and rescues
timecode-anchored conforms. Verified frame-exact against a 25-clip
4-track production conform (record positions and cut-in frames match the
generating lineup).
Signed-off-by: soupkitchenfilms <13426391+soupkitchenfilms@users.noreply.github.com>
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xSTUDIO clip active ranges are media-native file frames, but OTIO
source_rangeis expressed in the media reference'savailable_rangespace. Conforms anchored to absolute timecode (EDL/CSV-derived OTIOs whereavailable_range.start_timeis timecode-as-frames) import with trims ~1.2M frames outside the media — every clip shows wrong frames and cross-track record sync is lost.This maps ImageSequenceReference trims through
start_frame:Identity whenever
available_start == start_frame(xSTUDIO/NLE-authored OTIO), so existing behaviour is preserved; timecode-anchored conforms become frame-exact. Verified against a 25-clip, 4-track production conform (cut-in frames and record positions match the generating lineup exactly).Happy to add a unit test if you can point me at the preferred harness for timeline import.