: Likely indicates the source is Bilibili Global , a major streaming platform for anime and Asian media.

: This is a CRC32 hash (a unique alphanumeric code). Distributors include this so you can verify the file is not corrupted and was downloaded exactly as intended.

This filename follows a standard format used by digital media distributors and fan groups. : The episode number (Episode 5).

: The audio codec (Advanced Audio Coding), a standard format for compressed digital audio.

: The video codec (High Efficiency Video Coding, also known as H.265). It provides high-quality video at smaller file sizes than older formats.