This is a smaller and lower quality version of [[MTBB] Hibike! Euphonium – Sound! Euphonium S1 (BD 1080p)](https://nyaa.si/view/1690833).
[Video quality comparisons](https://slow.pics/c/8Rw74jrn)
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/).