- Mac OS 10.10
Steps causing the bug to occur:
- I think it's easier to see it in the composition
- creating vertical delay lines for the video and cropping them to compose a new image via layers causes an interference pattern
- Also there seems to be a mismatch between layer sizes of a pixel or so causing black lines
- I'm using a "Build list" node triggered from the "requested frame" that seemed to exhibit some of the same flickering with different/simpler compositions.
How did the result differ from what you expected?:
Black lines and flickering artifacts/scanlines that shouldn't be there.
Have you found a workaround?:
I'm not totally sure if it is a real bug, or just a result of me doing something that won't match up in the first place. I don't think so though, since I've had proper result with about the same concepts in QC when it comes to scaling and cropping layers and images/video. The flickering also seems like a frame-mismatch between video in and out, but it also happens with video files.
The "scanline" behavior also gets worse/more pronounced with more delayed lines so I'm a bit stumped. It may be resource dependent, but it is still present with few lines (and low resource usage) so I think there is something to it. I also noticed earlier that if building lists with the requested frame as an event source, it looked like it flickered at the last objects, which is where this flicker also seems to happen.