Full Version: Lossless or not?
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Checking for normalization can be done with replaygain. If the peak is ~0.9-1 then it might either be normalized or well mastered. So it's less reliable than TauAnalyzer.
Hmmm.. couldn't something be rigged up to access the AccurateRip database to see if a lossless file is bit-perfectly the same as what's on the original CD? Of course this assumes it was ripped with the proper offset to begin with, but still, a positive would be a more definitive indicator than peak values or FFT analysis.
QUOTE(Cyaneyes @ Aug 30 2007, 18:14) 
Hmmm.. couldn't something be rigged up to access the AccurateRip database to see if a lossless file is bit-perfectly the same as what's on the original CD? Of course this assumes it was ripped with the proper offset to begin with, but still, a positive would be a more definitive indicator than peak values or FFT analysis.
I have plenty of genuine lossless rips (done myself,) and not a single one is bitperfect because I don't really care about offsets. I'm pretty sure this applies to a pretty large proportion of lossless rips that one's likely to find, as well. So this might be much better at avoiding false positives (close to perfect, even,) but will through up huge numbers of false negatives.
QUOTE
Hmmm.. couldn't something be rigged up to access the AccurateRip database to see if a lossless file is bit-perfectly the same as what's on the original CD? Of course this assumes it was ripped with the proper offset to begin with, but still, a positive would be a more definitive indicator than peak values or FFT analysis.
Can I check FLACs against AccurateRip? Is there any tool?
QUOTE(Cyaneyes @ Aug 30 2007, 20:14)
Of course this assumes it was ripped with the proper offset to begin with, but still, a positive would be a more definitive indicator than peak values or FFT analysis.
Not really, what if the lossy music was once written to a CD that was then ripped with an AR-able program and the results ended up in the AR database?
Or what if the CDs are not in the database? This happens frequently to me.
TauAnalyzer has the advantage that it actually analyzes the data at hand. I guess it comes down to what you trust more, a scientific analysis or the AR users. Personally I trust the TauAnalyzer, but I won't trust a 1-5 confidence match from AR.
I'd do both tests (plus replaygain, which is done with every album anyway). But I can only get pretty sure results and no definitive results.
QUOTE(Bourne @ Aug 30 2007, 22:46)
Can I check FLACs against AccurateRip? Is there any tool?
Yes, convert the flacs to a single WAV and a CUE SHEET: in case you don't have a non-compliant CUE SHEET from EAC create a simple CUE SHEET that references to the FLACs first. Then load it up in CUETools and convert it to a "single WAV". Version 1.9.0 can even correct wrong offsets now.
Then use ARCue.pl to check the rip, but you'll need a Perl interpreter for this script to work.
But be warned that the AR database is far from complete, and a mismatch doesn't proof anything. You can only get the proof that a rip is genuine (under the premise that it wasn't uploaded to the AR database before, so a low confidence or 1-4 doesn't proof anything) and no proof that a rip has errors or is from a lossy source.
>(under the premise that it wasn't uploaded to the AR database before, so a low confidence or 1-4 doesn't proof anything)
A confidence of 1 does prove the result is secure as long as you your self have not submitted the cd. Confidence of 2, most definately 100% secure.
A confidence of 1 does prove the result is secure as long as you your self have not submitted the cd. Confidence of 2, most definately 100% secure.
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