Collection.10000.mkv — The

The "feature" you are referring to is on the Telegram Desktop GitHub repository , which requested the ability to upload and play MKV files as streamable videos .

Holds unlimited video, audio, and subtitle tracks in one file. The Collection.10000.mkv

The specific reference to "" is a technical identifier associated with a feature request for the Telegram Desktop application. Overview of Issue #10000 The "feature" you are referring to is on

The reason this feature was so heavily requested is due to the advanced nature of the container. Key features of the format include: Overview of Issue #10000 The reason this feature

An open-source alternative to proprietary formats like MP4. [Feature Request] Uploading and Playing MKV as video #10000

Includes chapter markers, menus, and detailed tags.

Previously, Telegram Desktop users had to send MKV files as documents, which required downloading the entire file before viewing. Other formats like MP4 could be streamed (played while downloading).