[FFmpeg-user] LUFS measurment for short length audio

christian.will at 4-real.com christian.will at 4-real.com
Mon Sep 14 14:23:42 EEST 2020


To cat means to loop the file until it is longer then 0,4s?

Yes we tried, there is a variation of 3db or more, so it is kind of suboptimal.
We also know the loudnorm command.

We use this command atm to read out values:

ffmpeg -nostats -i 'filename' -filter_complex ebur128 -f null -

and it is fine with all files >0,4s. As it should be relating to the ebu128 definition.

Anyway, our customer provides us with lufs values for shorter lenghts and he wont tell us how he analyses it.

Now we tried to read out momentary lufs, as it works with 400ms windows, but im not sure if i get correct values here.
As it shows -120db mLUFS for an example and on proTools it says -23--24db (with DPMeterXP2)

Anybody an idea how to read out reliable momentary LUFS values with ffmpeg?





-----Urspr√ľngliche Nachricht-----
Von: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> Im Auftrag von Gyan Doshi
Gesendet: Montag, 14. September 2020 09:50
An: ffmpeg-user at ffmpeg.org
Betreff: Re: [FFmpeg-user] LUFS measurment for short length audio



On 14-09-2020 01:15 pm, Bouke wrote:
>> On 09 Sep 2020, at 10:33, christian.will at 4-real.com wrote:
>>
>>
>>
>> Hi list!
>>
>>
>>
>> Can somebody help to measure LUFS for audio files under 0,4 seconds???
>>
> Cat it a couple of times first?

A few more times is required. Total duration should be  >3 seconds.

See https://superuser.com/q/1281327/

Gyan
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