Q1. I have tried an experiment. I took an image with resolution 1920×1280. The image contain three rectangle – 1920Ñ…1080, 1440×810 and 960×540. I scaling the image from 200% to 100%. On the first frame near the frameboarder I see the least rectangle (960×540). On the last frame – the biggest (1920×1080). Obviously, using the linear settings for keyframe, I should see medium rectangle (1440×810) on the medial frame, but I don’t. Why?
Video: https://youtu.be/MKnuR2NuTos
Here is a project: https://yadi.sk/d/HU8ZtlZV3GhSmU and th image: https://yadi.sk/i/82IT64LV3GhRDC
Q2. I know about it, but I looking for something else. When you are croping in Photoshop, you can see part of image outside the frame. You can see real image, not just the border. Dave LaRonde adviced to use AE, but as I understand it has the same interface and it not show something outside the frame border
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The best way is to use VirtualDub. It can trim and split video without render (use direct stream in video options).
If your source video has non-support container (like mp4), then use something like SolveigMM Video Splitter