How do I crop video ffmpeg?
Cuts a centred rectangle from each frame, using input-relative expressions so it works on any source size.
Crop a video to a square or vertical
Cuts a centred rectangle from each frame, using input-relative expressions so it works on any source size.
ffmpeg -i https://cdn.rendobar.com/assets/examples/sample.mp4 -vf "crop=ih*9/16:ih" -c:v libx264 -crf 23 -t 5 out.mp4- Encode
- 479 ms
- Output
- 210.0 KB
- Cost
- $0.0024
- Result
- 404x720
job_b3331a052082477e
The part everyone gets wrong
crop centres by default, which surprises people who expect a top-left origin, and it takes width before height. Writing the crop in terms of ih and iw rather than fixed pixel counts means the same command works on any input resolution, which is what you want in a pipeline.
Frequently asked questions
What goes wrong most often?
crop centres by default, which surprises people who expect a top-left origin, and it takes width before height. Writing the crop in terms of ih and iw rather than fixed pixel counts means the same command works on any input resolution, which is what you want in a pipeline.
Do I need FFmpeg installed?
Not with Rendobar. The command on this page ran through the API against a URL, with no local FFmpeg and no server. The job id below it is the job that produced these numbers.
More recipes, all measured
Trim a video without re-encoding Cuts a section out of a video by copying streams, which is effectively instant and lossless. Remove audio from a video Strips the audio track and copies the video untouched, so there is no quality loss and almost no work. Resize a video with FFmpeg Scales to a target width while computing a height that stays even, which H.264 requires. Rotate a video with FFmpeg Rotates the picture in 90-degree steps and clears the rotation metadata so players do not rotate it again.
Run this without installing FFmpeg
This exact command ran through the API against a URL.