Feathers.2021.pl.hmax.web-dl.h264.dd2.0-k83.mkv

The "tag" or name of the release group that prepared the file.

The file was losslessly downloaded directly from a streaming service (rather than being recorded/encoded from a stream). Feathers.2021.PL.HMAX.WEB-DL.H264.DD2.0-K83.mkv

Indicates the file likely includes Polish audio or subtitles. HMAX: The source is HBO Max . The "tag" or name of the release group

The file container (Matroska), which can hold multiple video, audio, and subtitle tracks. which can hold multiple video