This is a smaller and lower quality version of [Sound! Euphonium the Movie: Our Promise: A Brand New Day (BD 1080p)](https://nyaa.iss.one/view/1694821). Since these videos are 10-bit AV1, you should make sure you have a fully updated version of your video player to avoid playback issues, whether it's [MPC](https://github.com/clsid2/mpc-hc/releases/tag/2.0.0), [mpv](https://mpv.io/), or [VLC](https://www.videolan.org/vlc/).