Can't stream large files over Nginx

[Bonifacy]

ffmpeg log: https://pastebin.com/Ez1v8Ahs

I switched off hardware acceleration/transcoding entirely and it works. With it enabled dashboard looks like this: https://imgur.com/a/DkkMQ9H

Sorry about the language, I've set it to English, but it's not changing.
So I'm prettu sure that some transcoding options/formats are wrong.