This is the audio format (Advanced Audio Coding). It's a standard, high-quality compressed audio format that works on almost any device.
Are you having trouble getting the smoothly, or [NC-Raws] - 09 (B-Global 3840x2160 HEVC AAC MKV...
The "Matroska" container. It allows the file to hold multiple subtitle tracks and audio streams in one package. Viewing Considerations This is the audio format (Advanced Audio Coding)
This is native 4K resolution. While most anime is produced in 1080p, these files are often upscaled using high-end algorithms for better clarity on 4K displays. [NC-Raws] - 09 (B-Global 3840x2160 HEVC AAC MKV...
Use a modern player like VLC or MPC-HC with the LAV Filters to ensure the HEVC video decodes properly.