Video acceleration is 16 times?

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There is a video for a few hours. Format h.264. You want to speed it up 16 times, preferably without a remap, I suggest using only keyframes. Is there specialized software for this task (preferably free)? CPU is weak, P4.
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mencoder with the-speed option.
Manuals Google full, but may require selection of parameters.
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you can try mencoder with-ovc copy -oac copy — not to perekodirovat and -ofps — increased fourfold output fps
\r
\r
mencoder-noskip -ofps 95.904 -ovc copy -oac copy $inputfile -o $outputfile

where 95.904 — 4x23.976 fps source
if a ride — -ovc copy -oac copy will be forced to use processor and hard drive
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forum.doom9.org/showthread.php?t=124648
But most likely the processor does not pull.
\r
If you want to change the FPS, throwing away the footage, without transcoding can not do.
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Rebuild the video and audio in mkv container, there you can set a frame rate.
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