Video speed filters
Compute the setpts factor and split atempo when speed leaves the 0.5 to 2 range.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Video filename
Plan
ffmpeg arguments
Enter a video to plan
Stat: 0 · Stat 2: 0
What this tool does
- Check parameters before transcoding
- Convert time into samples or filters
Example
Input
clip.mp4
Output
变速滤镜规划 ffmpeg -i clip.mp4 -filter:v "setpts=0.5*PTS" -filter:a "atempo=2" output.mp4 速度 2x；音频 atempo 超过 2x 自动拆成多段
Computes an assertable plan or sample range. It does not touch devices or transcode files.
Frequently asked questions
Does it process the file?
No. It returns a plan, command, or sample range and never decodes media.
May numbers be strings?
Yes. Numeric strings from text controls are parsed as numbers.
Does it match ffmpeg exactly?
Times, filters, and bitrate formulas are deterministic; container overhead can still differ.
Keywords：变速setptsatempospeedvideo