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How to check if a flac file is real?

post #1 of 34
Thread Starter 
Hi! my question is how can i check if a flac file is really a copy from a cd and not just a converted mp3 file?
post #2 of 34
One way to find out is to check the frequency range.
Cause MP3 files are ran through a low-pass filter on encoding, cutting off at 16-19Khz depending on settings.

You still can't be 100% sure, but it should give you a clue.
post #3 of 34
The only way I know of with any kind of reliability would be to convert the FLAC file to WAV and use aucdtect to analyze it.
post #4 of 34
Thread Starter 
Quote:
Originally Posted by krmathis View Post
One way to find out is to check the frequency range.
Cause MP3 files are ran through a low-pass filter on encoding, cutting off at 16-19Khz depending on settings.

You still can't be 100% sure, but it should give you a clue.
and how can i check the frequncy range? is there a software for that??
post #5 of 34
Quote:
Originally Posted by plonter View Post
and how can i check the frequncy range? is there a software for that??
Audacity should be able to do so, and I even think it can import those FLAC files directly.
Audacity: Free Audio Editor and Recorder
post #6 of 34
The trouble with just checking for frequency is that it will only indicate lossy files of relatively low bitrates. At higher bitrates the cutoff can be above 19 kHz or more and there often isn't a lot of energy above that even in lossless files... so lack of extremely high frequency content isn't a very sure indicator. Aucdtect (while not 100% accurate because nothing is) will do a much better job.
post #7 of 34
Thread Starter 
thanks guys, i will work on it.
post #8 of 34
Spectrogram is also useful in this. (e.g. Foobar2000's one).

In a lossless file, it should spike up and down and vary, in a CBR file, it should 'trim off' at a certain height and not have those peaks.
post #9 of 34
If you've ripped it yourself surely you'd know if it was from the original CD?
cough cough downloading flac's?
post #10 of 34
Thread Starter 
Quote:
Originally Posted by iriverdude View Post
If you've ripped it yourself surely you'd know if it was from the original CD?
cough cough downloading flac's?
i sometimes download(legally ofcourse) some trance tracks from juno downloads, and they supply (exept from mp3 ofcourse) wav and flac files,
so..although i am 99% sure that they are not faking it(they also charge alot for this) i decided to check the files quality anyway just to be sure.

i also have a lot of spare time lately. most of my cds i rip myself so thats not a problem.
post #11 of 34
Quote:
Originally Posted by iriverdude View Post
cough cough downloading flac's?
cough cough... that's his own business?
post #12 of 34
legally download flacs?! where!?
post #13 of 34
Thread Starter 
Quote:
Originally Posted by member1982 View Post
legally download flacs?! where!?
i don't know if there are any other sites, but "juno downloads" let you download wav and flac from them. btw, it's 99.9% electronic music.
post #14 of 34
right i just did an search on juno :P didnt turn up any results other than an ISP :P yeah not for other type of music still if u like dance /trance
post #15 of 34
Thread Starter 
Quote:
Originally Posted by member1982 View Post
right i just did an search on juno :P didnt turn up any results other than an ISP :P yeah not for other type of music still if u like dance /trance
for dance/trance lovers it's a great site. although downloading in lossless formats is expensive! but it's worth it.
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