Is there a script to generate image sequences from VSE strips?

I saw a tweet from Ton recently where he said there was a py script that would generate proxies for blender VSE strips. But I can’t find it?

I guess it would interogate the strip name and re-render the file out to a predefined proxie size with a matching name. Perhaps into a proxie folder.

On the following blog, the latest post is from a month ago:

Yes thanks I read that one, but its part of a development build. I thought Ton was refering to a blender script that could be run in your project as an addon.