WEBP support

Hi there. Not sure if you're aware, but a lot of your users (from YouTubeDL) are unable to use your tool to embed thumbnails into videos.

YouTube is actually switching to WEBP for thumbnails now, which is causing atomicparsley to not convert. I was wondering if you would be so kind as to add .webp support to your tool.

Thank you

Thanks for filing an issue! Please note that this project is only passively maintained, so your best bet for getting an issue resolved is through a pull request that is easy to verify!

AtomicParsley is a tool for mp4 files. Adding support for other file formats would be a lot of work and almost like building a new, different tool, which honestly is probably a good idea--for example, there are some good quality libraries available to Rust that might make that relatively easy.

However: I don't use this tool myself anymore, and I only passively maintain AtomicParsley because I have a lot of other commitments that take priority.

Did you ever get this sorted? If not, if you use YT-DLP which is a fork of YouTube-DL you can add —convert-thumbnails jpg and the images will be saved as jpeg rather than webp