How do I ffmpeg normalize audio?
Brings perceived loudness to a standard target using the EBU R128 loudnorm filter.
Normalise audio loudness
Brings perceived loudness to a standard target using the EBU R128 loudnorm filter.
ffmpeg -i https://cdn.rendobar.com/assets/examples/sample.mp4 -af loudnorm=I=-16:TP=-1.5:LRA=11 -c:v copy -t 5 out.mp4- Encode
- 583 ms
- Output
- 363.0 KB
- Cost
- $0.0021
- Result
- 1280x720
job_972a36d97eec4144
The part everyone gets wrong
Single-pass loudnorm is an estimate and will miss the target, usually by a decibel or so. The accurate form is two passes: run once with print_format=json, read the measured values back, then pass them into a second run. Most guides show the single pass and never mention that it is approximate.
Frequently asked questions
What goes wrong most often?
Single-pass loudnorm is an estimate and will miss the target, usually by a decibel or so. The accurate form is two passes: run once with print_format=json, read the measured values back, then pass them into a second run. Most guides show the single pass and never mention that it is approximate.
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
Convert audio between formats Re-encodes an audio file to another codec, or copies it when the codec already suits the target container. Mute part of a video's audio Silences a time range while leaving the rest of the audio and all of the video untouched. Convert MP4 to GIF with FFmpeg Turns a video into an animated GIF using a generated palette, which is the difference between a usable GIF and a muddy one. Extract audio from video with FFmpeg Pulls the audio track out of a video, copying it without re-encoding when the format allows.
Run this without installing FFmpeg
This exact command ran through the API against a URL.