Re: True FLAC vs. Fake FLAC
Reply #83 – 2016-04-02 22:33:45
Another example, with music. Here is a lot easier to see the difference, but, as I said before, we must study the WORST SCENARIO, and that's Pink Noise. This time I've used my 1994 Disque Americ (Canada) print of... Dark Side Of The Moon. Mr. Alan Parsons did a nice mastering job... EAC, no errors, and the wav looks like this: And now the Lame V0 This is the script if you want to use it: #! /bin/bash mkdir MP3 && for f in *.wav; do lame -V0 --noreplaygain "$f" ./MP3/"${f%.wav}.mp3"; done As we can see, in a "cleaner environment" is easier to see the difference, even in a V0 (no lowpass) compression. Around 16KHz there's an abrupt cutoff on the low level content. And, very interesting, the wav seems to show a cutoff around 20KHz... And we know that is a perfect rip of an original print. So, in conclusion, an apparent cutoff (like in this wav) or a full frequency spectrum (like the pink noise mp3 V0) are ABOSLUTELY USELESS AND IRRELEVANT to determine if it's a fake or not. In the best case, when you see a big cutoff at 15-16 KHz you can suspect it's a lossy file, but a 20 KHz cutoff proves NOTHING. EDIT: Lossless Audio Checker said CUTOFF to my rip. So, you can't trust this software. EDIT2: I know it may sound too fundamentalist when I say "proves nothing". I mean, this is like the "for home use, no professional"... You can "suspect" is fake or real, but no more than that.