keep-loudness-range-target: Keep the input loudness range target to allow for linear normalization.

lrt LOUDNESS_RANGE_TARGET, -loudness-range-target LOUDNESS_RANGE_TARGET: EBU Loudness Range Target in LUFS (default: 7.0). p, -print-stats: Print first pass loudness statistics formatted as JSON to stdout. t TARGET_LEVEL, -target-level TARGET_LEVEL: Normalization target level in dB/LUFS (default: -23).įor EBU normalization, it corresponds to Integrated Loudness Target in LUFS. Peak normalization brings the signal to the specified peak level. RMS-based normalization brings the input file to the specified RMS level.

nt : Normalization type (default: ebu).ĮBU normalization performs two passes and normalizes according to EBU R128. pr, -progress: Show progress bar for files and streams n, -dry-run: Do not run normalization, only print what would be done f, -force: Force overwrite existing files This folder will be used for input files that have no explicit output name specified. of OUTPUT_FOLDER, -output-folder OUTPUT_FOLDER: Output folder (default: normalized) , where is the output extension (see -ext option).Įxample: ffmpeg-normalize 1.wav 2.wav -o 1n.wav 2n.wav Will be written to the default output folder with the name. If no output file name is specified for an input file, the output files o OUTPUT, -output OUTPUT : Output file names. If you want to use such containers and/or keep the file size down, use -c:a and specify an audio codec (e.g., -c:a aac for ffmpeg's built-in AAC encoder). Some containers (like MP4) also cannot handle PCM audio. This will result in a much higher bitrate than you might want, for example if your input files are MP3s. The default audio encoding method is uncompressed PCM ( pcm_s16le) to avoid introducing compression artifacts. This ensures that multiple files normalized with this filter will have the same perceived loudness. It will bring the audio to a specified target level. The normalization will be performed with the loudnorm filter from FFmpeg, which was originally written by Kyle Swanson. The video and subtitle tracks will be copied over to the output file. For example, if your input is a video with two language tracks and a subtitle track, both audio tracks will be normalized independently. ext m4a.īy default, all streams from the input file will be written to the output file. Using the -ext option, you can supply a different output extension common to all output files, e.g. If you don't specify the output file name for an input file, the container format will be MKV, and the output will be written to normalized/.mkv. In this case, the container format (e.g.wav) will be inferred from the file name extension that you've given.įfmpeg-normalize 1.wav 2.wav -o 1n.wav 2n.wav You can specify one output file name for each input file with the -o option. Just give the program one or more input files as arguments. All audio streams will be normalized so that they have the same (perceived) volume. The program takes one or more input files and, by default, writes them to a folder called normalized, using an. Please read this section for a high level introduction.

įor more information, run ffmpeg-normalize -h, or read on. ffmpeg v4.2 or higher from – static builds using the latest Git master are recommended.Can I buy you a beer / coffee / random drink?.After updating, this program does not work as expected anymore!.Couldn't I just run loudnorm with ffmpeg?.What are the different normalization algorithms?.The conversion does not work and I get a cryptic ffmpeg error!.Should I use this to normalize my music collection?.

The program doesn't work because the 'loudnorm' filter can't be found.

Done! 🎧 (the file will be in a folder called normalized).

Run ffmpeg-normalize /path/to/your/file.mp4.

It can also perform RMS-based normalization (where the mean is lifted or attenuated), or peak normalization to a certain target level.īatch processing of several input files is possible, including video files. This program normalizes media files to a certain loudness level using the EBU R128 loudness normalization procedure. A utility for batch-normalizing audio using ffmpeg.

Ffmpeg command line arguments