[JanWillem32]

Thanks for the tips, maybe I'll find something in the Avisynth code. I'll definitely take some time to add a set of resizers. It's a lot of work to get the shader code running, and even more work to write the menu entries (the main reason I added a whole set of six resizers at once the last time).

I've taken a look at the external filters. For the renderers it was easier to solve than I thought at first. (I was afraid it was one of the changes to the subtitle renderer.)
I've also fixed a minor bit of memory management for the subtitle renderer.