I have a lot of video that was originally recorded interlaced, and was digitized at the wrong resolution with anamorphic enabled, so the videos have huge pillarbox areas and chunks of blank overscan lines.
So I need to do the following:
Deinterlace with bob
Crop off between 10 and 50 lines of overscan on top and bottom and about 60 lines on each side
Resulting video will be about 600x470, scale it to 640x480 so I can get rid of the anamorphic distortion and end up with square pixels
Maybe add sharpening or hue correction
Since Shotcut (apparently) only deinterlaces after applying other filters, the scaling filters will ruin the deinterlace by shifting lines out of the fields they were originally in. However some of these videos are hours long and I hate to just deinterlace to a lossless file first.
Since Shotcut (apparently) only deinterlaces after applying other filters
That is completely wrong. It does deinterlace before other filters including scaling. See this file below. It defines filters in the engine that are added automatically before all manually specified filters: