5_6136236148210534044.m4v -

The extension is a video container format developed by Apple, nearly identical to .mp4 but with specific characteristics: What Are M4V Files? | M4V Format Explained - Adobe

: Detecting objects, colors, or edges using algorithms like Sobel masks . 5_6136236148210534044.m4v

In technical contexts, "looking at a proper feature" in a video file refers to —the process of identifying and isolating specific characteristics within the video, such as: The extension is a video container format developed