Hi,
When I run an audio file through the 'loudnorm' filter, I get the following:
> ffmpeg -i <file> -af loudnorm=print_format=json -f null -
...
"input_i" : "-13.87",
"input_tp" : "0.06",
"input_lra" : "8.50",
"input_thresh" : "-24.45",
...
When I run the same audio file through the ebur128 filter, I get the
following:
> ffmpeg -i <file> -af ebur128 -f null -
Integrated loudness:
I: -13.8 LUFS
Threshold: -24.4 LUFS
Loudness range:
LRA: 8.7 LU
Threshold: -34.3 LUFS
LRA low: -20.1 LUFS
LRA high: -11.4 LUFS
Why are these measurements different? Even if rounding would be towards 0,
that would not explain the LRA difference?
thanks,
Remko
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