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Speed a clip up or slow it down with the FFmpeg setpts filter
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What this guide covers
For editors who want a quick speed change from the command line. You end with a faster or slower video track, with the new length worked out in advance. Based on the FFmpeg filters manual and not run; audio retiming is not covered.
More about this guide
Guide ID: art_01M6TZT9NPFRHNSG1H76FJ9MKZ
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Guide title
Speed a clip up or slow it down with the FFmpeg setpts filter
Coverage
For editors who want a quick speed change from the command line. You end with a faster or slower video track, with the new length worked out in advance. Based on the FFmpeg filters manual and not run; audio retiming is not covered.
Example
A hypothetical 10 second clip should play in about 5 seconds at one setting and about 20 seconds at the other; these lengths are arithmetic and no run was made.
Useful starting points
- If picture and sound drift apart, the video was retimed and the audio was not; retime the audio too or drop it.
- If the speed is the wrong way round, remember a multiplier below 1 speeds up and above 1 slows down.
- Slow motion made this way may look steppy because no new frames are created.
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