Issue with rotated video: flickering white and black line

[rmeilleur]

When I rotate a video 180 degrees, the rotated video will always have a flickering black and white line in the top 2 pixels (running across the top of the video from left to right). This is visible in exported files, as well as the Shotcut video preview, with any video file I use. If I crop those top 2 pixels in Shotcut, the flickering line just appears again at the top of the cropped video.

Has anyone had this problem, know how to resolve?

[jupiter]

I’ve encountered almost the same issue, and have documented my experience and solution as a bug report.

Rotate Filter removes/replaces 1 pixel of width and height

With Scale at 100.0% on a 720p+ video, the Rotate filter will clip 1 pixel of height and width from the bottom and right of the source, leaving behind a cloudy or black border on two sides. If the video is rotated 180 degrees, the border is more pronounced and will show up in the top and left. The bug is part of Scale, because at 100%, an offset of 1 will migrate the border to the other side (kind of like moving carpet that’s one pixel too short). This bug can be countered with Scale set to at l…

[Steve_Ledger]

@rmeilleur

Has anyone had this problem, know how to resolve?

I’ve not come across this personally, but the size and position filter can be use to fix this.