AV1 is very efficient (around twice as good as h264), but a filesize that low was almost definitely because the default encoding settings were more conservative than the ones used to encode the blu-ray. The perceptual quality of that 1.5gb file will be noticeably lower than the 44gb one

I’ve never administrated a Lemmy instance, but I can’t shake the feeling that the traffic and activity that would generate would be a massive blow to the infrastructure we have right now. I can’t name anybody at the moment, but maybe we should start with someone a bit smaller?

If you’re taking a similar route to YouTube, you also need a ton of CPU/GPU power and/or specialized hardware. YouTube transcodes every video into 2 (3 for videos with >~2M views) different formats in 5 different resolutions. A community-run service could skip on some of that, but it’d come at the cost of lower quality, less support for older devices, or higher bandwidth usage.