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Extracting frames from a video with ffmpeg very slow if not using jpeg
(discuss.tchncs.de)
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At this point I'm very sure that the drive speed is actually the bottleneck. I'm not sure why it's so slow tho. Splitting it is an interesting idea, maybe it's also possible to tell ffmpeg to only extract every 6th frame and start at a different frame for each of the 6 cores.