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Of course, the magic of the internet is that a damaging urban legend about dBpoweramp has been created by the OP and that legend will live forever. If the checksums or hashes don't agree, it just means that you need to use a tool like Foobar or EAC that compares the audio stream itself. If you compare whole WAV files as a whole and the checksums or hashes agree, it is very likely that the audio data is the same in the two files. For example, some programs may store tag values in chunks in WAV files. The WAV file may include other kinds of chunks as well. Even if the audio data is the same, it may not be divided in chunks the same way. Download the latest version of dBpoweramp Music Converter for Mac - Convert music and rip CDs (was dBpoweramp Reference). There is more in a WAV file than just the audio data. Its also handy to have a binary diff tool which can point out strings of data that are different after converting everything to WAV. I can't remember if it was foobar2000, but that is what I remember while doing lossless conversion tests.įoobar2000 has a plugin for comparing music data too. I believe some converters like foobar2000 may inject extra meta data or tags into the WAV file. You may need to download a program to examine the actual music data and do a comparison. Originally Posted by pedxing /img/forum/go_quote.gifĬhecking the hash may not be good enough.
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Convert the files to wav using iTunes, then convert the wav files to FLAC using dbPoweramp or some other software you have verified can create bit perfect FLAC files. Therefore, dbPoweramp can convert to and from FLAC losslessly but consistently fails to convert from ALAC losslessly.Ĭonclusion: If you are going to convert your ALAC files to FLAC, do not use dbPoweramp. The hash of the resulting wav file in this case matches the hash we got from converting from ALAC straight to wav (although it still does not match the hash of the initial wav file). Compare the hash of the resulting wav file to the other hashes we have so far. Convert the FLAC file to wav using dbPowerampģ. Convert the ALAC file used in test #1 above to FLAC using dbPowerampĢ. Test #3 Is dbPoweramp able to convert to FLAC losslessly?ġ. The failure of the previous test then, lies with dbPoweramp and not with iTunes or the ALAC format. Compare the hash of the final wav to the hash of the initial wav Test #2 Are Apple Lossless files truly lossless?Ĥ. Either dbPoweramp is unable to do a truly bit perfect conversion of ALAC or iTunes is unable to do a truly lossless compression of a wav file into ALAC. The wave file we have after these conversions to allegedly lossless formats is not identical to the wave file we started with. Compare the hash of the resulting wav file to the original Test #1 Can dbPoweramp recreate a wave file losslessly from an ALAC File created by iTunes?Ĥ. fciv.exe, the Microsoft provided tool for checking hashes correctly computes md5 values. As with all perfectly copied files, two identical wave files will have the same md5 hash.Ģ. I decided to do some testing to see if this was truly as bit perfect as it claims to be. I have heard people recommend dbPoweramp for converting ALAC files to FLAC.