I’ve carefully preserved the application QuickTime 7.6.6, distributed with Snow Leopard years ago, because it more flexibly edits .mp4, .mov, .mkv, .avi, and .wmv (with Fiip4Mac) videos than does QuickTime 10.4, currently distributed with El Capitan. QT 7 worked fine up through Yosemite. However, now with El Capitan, it does something strange. If I go into Movie Properties –> Video and try to rotate a vid — whether in original, say, .mp4, or processed as a .mov file — the rotation corrupts the image. The image doesn’t rotate, it shrinks and gets grainy, with wild colors; and it doesn’t fill the rotated QT window. I can rotate around the clock and the image doesn’t get improve until it is in the original. This i orientation.
This error doesn’t occur in QT 10 — but after opening such a video file, QT 10 won’t save the video in a new orientation.
Any ideas what’s happening? Thanks for your experiences.