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by scottlamb
2987 days ago
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Depending on the container format, you may not need to re-encode anything. .mp4 supports "edit lists". You can create a .mp4 file that starts at the latest key frame <= the starting timestamp of interest, onward through the ending timestamp of interest. And has an edit list that tells the player to skip the unwanted prefix. You can have arbitrarily many of these in one file. I do this as part of a larger program (security camera NVR), although directly writing the .mp4 rather than instructing ffmpeg to do so. Afraid I don't know how to do what you want with the ffmpeg commandline tool, though, either by partial re-encoding or by edit lists. |
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