Slow down video with FFmpeg

Here is a quick example on how you can use FFmpeg to slow down a video.

Slowed down video by 50%:

ffmpeg -i input.mp4 -vf setpts=2*PTS -filter:a atempo=0.5 output.mp4

• -vf setpts=2*PTS will slow down the video twice it’s original speed.
• -filter:a atempo=0.5 slows down the audio to 50%.

Unfortunately, the caveat here is that the tempo must be in the range of 0.5 to 2.0.

Also, you do not get that slow-motion down pitched sound as many slow-motion videos have.

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Sources:

Speeding up/slowing down video