: The .mp4 extension indicates it is a standard digital multimedia container, likely encoded with H.264 or H.265, making it compatible with almost all modern phones, computers, and social platforms. Contextual Possibilities
: The video was captured or generated on September 7, 2021 . video_2021-09-07_23-12-10.mp4
: This specific naming format ( video_YYYY-MM-DD_HH-MM-SS.mp4 ) is the default signature for videos saved or downloaded from Telegram . likely encoded with H.264 or H.265