ffmpeg motion interpolation for 2x and 4x slowmotion

Question

I recently learn that I can use minterpolate option of ffmpeg for frame interpolation in a video. One of the configuration of this option is fps(frame per second) and I am not sure how I should set it to generate 2x and 4x slow-motion videos. Here is how I use it right now: ffmpeg -i input.avi -filter "minterpolate='fps=120'" output.avi

seems like the generated output video doesn't have equal number of frames generated between every 2 consecutive frames. Can anyone help me here or point me to a helpful document?

Thank you,

I think it's 30 FPS. I got that by running this: ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=noprint_wrappers=1:nokey=1 input.avi — Mary, Nov 02 '18 at 18:08
did you already try this? https://lists.ffmpeg.org/mailman/listinfo/ffmpeg-user/ — Harry, Nov 02 '18 at 20:02
Have a look at this: https://superuser.com/questions/1005315/interpolation-with-ffmpeg/1568827#1568827 — Ondra Žižka, Jul 15 '20 at 12:21

score 7 · Answer 1 · answered Nov 05 '18 at 11:05

7

You are currently generating a 120fps video at normal speed. To do a slow-mo you need to slow it down by 4x ffmpeg -i input.avi -filter "minterpolate='fps=120',setpts=4*PTS" output.avi

should do the trick.

answered Nov 05 '18 at 11:05

Pete Allen

71
1

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This command will fail if you have an audio track on your input file, you'd have to use `-filter:v` – Zimano Feb 03 '21 at 10:22

ffmpeg motion interpolation for 2x and 4x slowmotion

1 Answers1