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How To tell between a 'real' FLAC and a 'fake' FLAC?

Discussion in 'Sound Science' started by chinesekiwi, Aug 31, 2009.
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  1. arnyk
    Yes, what you have in general looks normal.
  2. HKO2006
    The site went down I am afraid but I am still able to download via the mirror.
    In case the above went down too, here is a backup: https://drive.google.com/folderview?id=0B151yw6KLtfGfm9XRUVtN0tpbk9JS2ZiN21aQ0R1bDFVaS1pY293T01xOFhZQVJjNjYwcTQ&usp=sharing
    If both failed, google Spectro 1.0.93.
    The homepage
  3. Antonis Vlachos
    Hey man, 
    The last years i am using a free tool, the best in my opinion. Its for windows,mac and Linux and its called SPEK. http://spek.cc/
    You just drop the file there. I have tested it on 24/96khz and it worked fine. Give it a try and you'll love it.
  4. Alexium
    Spectro is great, but can't handle single-track lossless releases (image + .cue). Makes me wish to make a similar program, but with no such limitations and with batch mode support (e. g. "scan everything within the specified set of folders").
  5. lawlbear
    Wouldn't file size be a good starting indicator? 
  6. ExtremeGamerBR
    AccurateRip is by far the best way to see if you have a REAL Flac.
  7. The Walrus
    I tried Spectro with some of the CD's I ripped using Media Go, and it shows a cut-off frequency of 20.5 KHz.
    What is more confusing is, one album I bought from Qobuz.com shows 16.5 KHz! (Although the graph shows spikes here and there all the way to 20 KHz. 

    The upper limit of human hearing is 20 KHz. Could it be that the flac encoder is cutting the frequency off there somehow?? So confusing. 
  8. ExtremeGamerBR
    Nop, FLAC does not cut anything. It is lossless, so nothing is lost. It compress the audio like a ZIP file, and the player descompress without loosing quality.
    Did you tried to check your files with AccurateRip? CueTools or Perfecttunes can do this. Only dBpowerAMP or EAC can upload rip results to the AccurateRip database. So, if you FLAC or whatever lossless format you are using gives at least V2 of confidence, it is a perfect rip. So, with this method you can check if the files are real AND if they was properly ripped.
    Sorry for my bad english.
  9. The Walrus
    Good idea. Will try it. Thanks :)
  10. Bubblejuice
    This is great! Thank you :D
  11. Bubblejuice
    What could I use if I have a huge FLAC file? I downloaded an album, but it turns out the whole album came in one FLAC file. It's 36 minutes long. Spectro says it's too large to process, but i'd really like to make sure it's solid.
  12. ExtremeGamerBR

    Here is a good tutorial: https://losslessma.net/how-to-split-and-convert-single-file-flac-album-into-tracks/
  13. zareliman
    The spectral analysis is the most reliable way to find out about lossy compression but it's not perfect.

    Masters and audio processing can produce artifacts that can ultimately end up looking like a compressing algorithm was used at some point. Ultimately the auCDtect algorithm tries to do the same thing you are doing by naked eye. Algorithms work better or worse than humans depending on the problem.
    That is largely depending on the encoding used. It looks like you're using CBR since it cut offs and sometimes the peaks go higher (when the data rate allows it). Try to change the scale of the frequency on your spectral analyzer to get further information on the upper frequency range.
  14. Bubblejuice
    Incredible tool, thank you!
  15. Alexium

    Spek is the best tool I know.
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