When a timeline has video assets that are .mov using the HEVC codec, a couple of frame shifting bugs pop up. If the sequence frame size is changed, the timeline will lose a frame and each asset in & outpoint is shifted.
In this use case, the timeline is exactly 24 frames and the source videos are exactly 24 frames, encoded with .mov with HEVC compression.
The timeline timecode shifts one frame. If the timeline started at 0, it now starts at 00:59:59:23. If it ended at 1 minute exactly when at 1920x1080, after changing to 1080x1080, the timeline now ends at 59 seconds and 59 frames.
Immediately after the hitting "ok" after entering the new sequence frame size, the playhead is flipped backwards (the bar is on the left side instead of the right side). It flips back to the normal side once you move the playhead.
The in point for the HEVC clips is one frame later. The clips have not shifted on the timeline. The in point of the content has changed. For example, if the source clip had an in point of 00:00:14:03 on the 16x9 timeline, after changing the size to 1080x1080, the in point is now 00:00:14:04.
Captions show on screen when the playhead is one frame to the left of where the captions should begin.
Transcoding the HEVC source files to ProRes 422 HQ, unlinking the assets in the project, and re-linking to the 422 HQ versions does not fix the issue.
Premiere Version: 24.3.0 (Build 59)
Hardware:
- Mac Studio (2023)
- Apple M2 Ultra
- Memory: 128 GB
- OS: 13.4 (22F2063)
- 8 TB internal drive (over 5 TB of free space)
- Display: Apple Studio 27 inch
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