Video Speed Changer

Generate the correct FFmpeg setpts/atempo filter chain to speed up or slow down any video — pick a multiplier, enter your filename, copy the command.

Speed Settings

×
18

Lower = better quality, larger file. 18 = near-lossless. 28 = good web quality.

Duration Calculator

Generated FFmpeg Command 


        


        
        

            
Filter Breakdown

            

        


        
        

            

                
Common Speed Reference

            

            

                

                    
                        

                            Speed
                            setpts value
                            atempo chain
                            Use case
                        

                    
                    
                        

                            0.25×
                            4.0*PTS
                            atempo=0.5,atempo=0.5
                            Extreme slow-mo
                        

                        

                            0.5×
                            2.0*PTS
                            atempo=0.5
                            Slow motion
                        

                        

                            0.75×
                            1.333*PTS
                            atempo=0.75
                            Slightly slower
                        

                        

                            1.5×
                            0.667*PTS
                            atempo=1.5
                            Faster pacing
                        

                        

                            2×
                            0.5*PTS
                            atempo=2.0
                            Double speed
                        

                        

                            4×
                            0.25*PTS
                            atempo=2.0,atempo=2.0
                            Timelapse
                        

                    
                

            

        


    







    
        
    
    Copied!




            

                

          

                        

                
Summary

                
Generate the correct FFmpeg setpts/atempo filter chain to speed up or slow down any video — pick a multiplier, enter your filename, copy the command.

            

                        

                
How it works

                
    
                                        
  1. Choose a speed multiplier from the preset buttons or type a custom value.
    2. 
                                        
  2. Optionally enter your input filename (defaults to input.mp4).
    3. 
                                        
  3. Choose whether to keep audio at the new speed or strip it entirely.
    4. 
                                        
  4. The tool generates the FFmpeg command with the correct setpts and chained atempo filters.
    5. 
                                        
  5. Click "Copy Command" to copy it to your clipboard, then paste into your terminal.
    6. 
                                        
  6. Use the duration calculator to preview how long the output file will be.
    7. 
                                    

            

                        

                
Use cases

                
    
                                        
  • Create a 2× speed timelapse from screen recordings or tutorial videos.
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  • Slow down sports footage to 0.5× for detailed frame-by-frame analysis.
    • 
                                        
  • Speed up long meetings or lectures to save time without re-encoding quality loss.
    • 
                                        
  • Generate 4× fast-forward clips for social media previews.
    • 
                                        
  • Slow-motion effect on action shots recorded at high frame rate.
    • 
                                        
  • Adjust video pacing for presentations or educational content.
    • 
                                    

            

                        

                
Frequently Asked Questions

                

                                        

                        
                        
                    

                                        

                        
                        
                    

                                        

                        
                        
                    

                                        

                        
                        
                    

                                        

                        
                        
                    

                                    

            

                      


          
        


                

            Last updated: 2026-06-11 ·
            Reviewed by Nham Vu