133mp4 -

In the context of the Dynamic Adaptive Streaming over HTTP (DASH) protocol, YouTube assigns unique numeric codes to every available quality and codec combination for a video. "133" is the standard identifier for: Container: MP4 (.mp4).

This is a "video-only" DASH stream, meaning it does not contain audio; the audio is stored in a separate stream (like itag 140) and synchronized by the player during playback. Scientific and Academic Contexts 133mp4

Typically encoded with H.264/AVC (Advanced Video Coding). In the context of the Dynamic Adaptive Streaming