Simple crop

[dchura7734]

This is a really good package! I know you said it does not support cropping, but I might like to try to modify it to do so. I'm only looking to do a simple cropping where the output video retains the correct pixel shape (i.e. square pixels).

For example a 1080x1920 input size transcoded to 1080x1080 output size would simply clip all the pixels below 1080 in the input. Is this possible in the current code, and if not where should I start to work on the code to add it?

thanks again for creating this package