I think it´s absolutely random.
Just made 12 movies in crop mode (tested 1920x960 (first 7) and 1920x818 (rest)):
- good
- pink
- pink
- pink
- good
- pink
- pink
- pink
- good
- good
- pink
- pink
Just made 12 movies in crop mode (tested 1920x960 (first 7) and 1920x818 (rest)):
- good
- pink
- pink
- pink
- good
- pink
- pink
- pink
- good
- good
- pink
- pink