Huh, you’re right. But a few weeks ago I was definitely able to download via Fido. Maybe try that.
With current hardware support I would advise against using AV1 or even H.265.
I’d recommend to experiment with H.264 and low CRF values to see what quality loss and file size OP is comfortable with: https://trac.ffmpeg.org/wiki/Encode/H.264
If you need E2EE there’s only Matrix. I wish it wasn’t the only option, but it is. For setting up rooms and so on you can use their Spaces feature, I think.
I’ve been looking for an alternative, too: https://feddit.de/post/8502516
I’ve successfully used https://instaloader.github.io/ in the past.
In case your Lenny client concatenates the dot to the link like mine: https://medium.com/@joshuaavalon/encode-video-with-handbrake-on-server-17b6127f6ac7
Does this support other targets like twitch VODs?