Pretty much what the title says. I've heard that there's a program that will help you detect whether the lossless rip is legitimate? If there is, how does it work?
How can I tell if my FLAC file is truly lossless, and not converted from a lossy file?
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These programs can only "guess" if the source was lossless by looking at the spectrum and trying to detect artifacts that are inherent to lossy codecs, e.g. a low pass filter.
The simplest way to be 100% sure is to rip and encode CDs yourself, period. There's also AccurateRip which can be used to check if an album was ripped correctly (which checks checksums vs. an online database of user's submissions).
Edited by xnor - 6/7/12 at 7:06am
Because they can. A lot of garbage can be found on file sharing sites, including bad rips, transcoded stuff ...
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You can use any audio editor to check the frequency range of the file.
I personally like Wavepad Sound Editor (no advertising intended).