I’ll bet Ivy is opening the main movie in QT player and selects an in and out. Then she copies the selection and pastes it into a new empty player window. Then she exports from that new clip. Sounds fine right? Well, by pasting into a new window she has only made a reference clip from the original, so in fact the slate is still part of the entire stream that the new clip can see.
In MPEG Streamclip you can mark an in and out and export only that portion of the movie and that new movie will not contain any trace of the original. I’ll bet if she saved the new ref clip to a new self contained movie, then opened that one and exported to her final the mysterious slate would be gone.
Try it and please report back.
Rich Rubasch
Tilt Media Inc.
Video Production, Post, Studio Sound Stage
Founder/President/Editor/Designer/Animator
https://www.tiltmedia.com