I was starting to use KDEnlive this last weekend to re-sound some Hidef videos (1080p) and used the crop video effect to crop them to 720x480, so if I select the built-in 16:9 .avi resolution, it won't interpolate pixels to resize from the original (1920x1080p). I'm not sure it really matters since there is usually image compression involved, but I thought that it shouldn't "render" but should simply transcode. Am I missing something?
Also, I cropped out 95% of the video but still KDEnlive takes many seconds to move from frame to frame - I assume although the video is gone from the timeline, it's still reading through the original 10GB file on disk. Is there a way to save just the relevant parts of the video (what's left in the timeline after I've cut parts out) in a new (smaller) file without rendering? (i.e., keeping the full resolution)