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Do those m4a files contain AAC? |
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Foobar2000 2.1 reports LUFS -8.90 and TP +2.20 (1.287598), but $ rsgain.exe custom -s s -t test.mp3
[OK] Scanning 'test.mp3'
[OK] Container: MP2/3 (MPEG audio layer 2/3) [mp3]
[OK] Stream #0: MP3 (MPEG audio layer 3), 44 100 Hz, 2 ch
...
Track: test.mp3
Loudness: -8.90 LUFS
Peak: 1.178432 (1.43 dB)
Gain: -9.10 dB Why 1.178432 (1.43 dB)? |
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I did some comparisons of replaygain scan results from different applications, and found that they were sometimes exactly the same as rsgain, but sometime had slight differences -- differences too slight to make any real world difference, but varying enough to stir my curiosity.
I scanned the same album of m4a files using rsgain and DeaDBeeF (both Linux), and foobar2000 and MusicBee (both Windows).
• DeaDBeeF had the exact same results as rsgain (rsgain easy with no clipping protection set in a profile).
• MusicBee and foobar2000 produced identical results, but some values, e.g., album peak, were off slightly from rsgain. Per track adjustments were virtually identical, with only slight difference that I suppose might be from some rounding convention (a guess).
From what I gather, all these applications use the same type of scanner, based on the EBU R 128 standard, although using -18 LUFS.
What accounts for the very small differences in scan results?
![deadbeef_replaygain_PBCB](https://private-user-images.githubusercontent.com/28717740/303092061-2f99d7c7-48f1-40ba-a5a1-9ef4ecd111ee.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.Tn79jqR6iMLmtgGjBNY4ceAvU6f284LmTaNdnvu-X_I)
![replaygain_foobar2000_PBCB](https://private-user-images.githubusercontent.com/28717740/303092065-f987998a-31c7-4a50-ae01-f53cbfb11d62.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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._51wwrol_v7YFyB58PVUei5izoRrtWfdGmwhAbXPPzM)
![rsgain_PBCB_wprofile](https://private-user-images.githubusercontent.com/28717740/303092069-ecc70cae-6cd7-4ff6-807a-0b088b1c346d.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.KIeI10K1ffNC6O-xKL7RkXWpai6Uy1iE8V_Ksr9hZFo)
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