How do I ffmpeg fade in fade out?
Fades from black at the start and to black at the end, with the audio faded to match.
Fade a video in and out
Fades from black at the start and to black at the end, with the audio faded to match.
ffmpeg -i https://cdn.rendobar.com/assets/examples/sample.mp4 -vf "fade=t=in:st=0:d=1,fade=t=out:st=4:d=1" -af "afade=t=in:st=0:d=1,afade=t=out:st=4:d=1" -t 5 out.mp4- Encode
- 1100 ms
- Output
- 516.5 KB
- Cost
- $0.0026
- Result
- 1280x720
job_da994abc44a0421b
The part everyone gets wrong
The fade-out start is an absolute timestamp, not an offset from the end, so it has to be computed from the duration. Change the clip length and every fade-out command you wrote is silently wrong. Probe the duration first rather than hardcoding it.
Frequently asked questions
What goes wrong most often?
The fade-out start is an absolute timestamp, not an offset from the end, so it has to be computed from the duration. Change the clip length and every fade-out command you wrote is silently wrong. Probe the duration first rather than hardcoding it.
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.