Fyi, you can easily encode your obs recording via good old Handbreak or similar (editors usually also let you so that, but if you are not planning to edit.. )

https://handbrake.fr/

Currently, videos are recorded and uploaded directly to Amazon S3, and I haven't set an explicit limit on video length. I've personally tested uploads around 15–20 minutes without issues, and a couple of users have successfully recorded 30-minute videos, though I haven't fully rendered or extensively tested videos at that length yet.

The app uses a custom renderer inspired by ReMotion, so while the app can output MP4s, I also have a player that is dynamic HTML/CSS animation powered by JS, hosted either on my site. I could make it a player that is hosted from anywhere, and I think I will do this for a free tier.

Theoretically, this setup can handle videos of arbitrary length, but practically speaking, I've only thoroughly tested around 10–15 minutes. I'd recommend caution with significantly longer recordings (like an hour) for now, as you might encounter rendering issues.