![]() ![]() In this example we scan for frames that are the default 0.10 pixel luminance value that defines "black" and at least 0.05 seconds in length. Scanning a video for such transitions is as simple as: ffmpeg -i. Applied to television news, it scans the entire broadcast and identifies all groups of frames in which each frame is more than the specified black threshold and the total duration of the video sequence is longer than the specified length of time. It turns out that the venerable open source "ffmpeg" utility has a built-in filter for detecting such intervals called " blackdetect" (note that Debian users might need to compile a modern ffmpeg from source or use a precompiled binary). ![]() A common methodology for detecting commercials in television news is to scan for the tell-tale "fade to black" used to fade into and out of commercial breaks on most channels. ![]()
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