Yfm (51) Mp4 ◎

: This is a standard digital multimedia container format most commonly used to store video and audio. It is highly compatible with nearly all modern devices and social media platforms.

: For the best balance between quality and compatibility, ensure your MP4 uses the H.264 (AVC) or H.265 (HEVC) codec. Yfm (51) mp4

What are the format and resolution requirements for video? - Facebook : This is a standard digital multimedia container

can save recordings directly into the format for easy sharing. Yfm (51) mp4

: This is an internal label often seen in the metadata of files downloaded using command-line tools like yt-dlp . It typically denotes the video was sourced from a YouTube-like service using the "Yfm" format group. Video Quality & Encoding Guide