That preview you see when you hover over the Netflix or YouTube timeline isn’t the video playing in real time. When you move the cursor: – the video is not seeking – no backend request is made Everything is prepared at upload time. The backend extracts frames at fixed intervals, packs them into sprite sheets, and generates a metadata file (VTT/JSON) that maps timestamps to exact crop positions. These assets are stored on a CDN. On hover, the frontend simply: mouse position → timestamp → sprite c
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