Shot detection vs grabbing a frame every few seconds
When you pull frames out of a video, you are really choosing between two approaches: grab one on a fixed timer, or grab one at each real cut. They sound similar, but the results are not. Here is the difference and when to use each.
Fixed intervals: simple, but blind
Grabbing a frame every N seconds is the simplest approach. It is also blind to the content. A 3-second shot and a 30-second shot get treated the same, so a slow scene gives you ten near-identical frames while a quick cut in between gets skipped entirely.
Fixed intervals are still useful when you genuinely want an even sample across time, for example a timelapse-style overview or a per-second reference. When that is the goal, interval capture is exactly right.
Shot detection: frames that mean something
Shot detection analyzes the footage and finds where each shot actually starts and ends. Then you get a frame from each real shot, one per distinct moment. Fast-cut footage simply produces more shots, slow footage fewer, which is exactly what you want.
This is what makes a contact sheet or a storyboard useful: every tile is a different shot, not a different second of the same shot.
Which should you use?
Use shot detection when you want frames that represent the video's structure: storyboards, shot lists, contact sheets, color palettes. Use fixed intervals when you want an even time sample regardless of cuts. FrameCatcher offers both, so you can pick per job.
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Automatic Shot & Scene Detection