CRC errors when re-encoding FLAC files ?

[Jose Hidalgo]

Hi everybody,

I take a FLAC file, then I calculate its CRC / MD5 with F-CRC calculator :
CRC : E82D8973 MD5 : 106EBD3486A81D43B943421F9545D5DD

Then I re-encode the file to FLAC with dbPowerAmp and I check the re-encoded file :
CRC : 1F647371 MD5 : BCC3157ED4EC9131632BC4222DD26BDA

Am I becoming crazy or what ?!? They should be identical !!! :confused:

Of course I did another test, with another random-choosed file :
Before : CRC : AE1A23E0 MD5 : 3064D0A9F4070C2B229E9CF2691EBA82
After : CRC : E4B2055D MD5 : 470555E94244234254EEC07BE38F7FF3

I'm using dBpowerAMP 12.3 + FLAC release 10 (FLAC 1.2.0), with "verify" option checked.

Thanks for enlightening me on this matter.

[LtData]

Re: CRC errors when re-encoding FLAC files ?

The difference is probably in the tags. If you have Reference, use the "Calculate Audio CRC" to calculate the CRC in just the audio portion of the file.

Edit: You just need the Reference Codec pack, the "Calculate Audio CRC" portion doesn't require Reference itself.

[Jose Hidalgo]

Re: CRC errors when re-encoding FLAC files ?

That's good news. Unfortunately I don't have Reference. Is there a software that could help me with calculating CRCs in only the audio portion of the files ? Thanks.

EDIT : but if I understand you well, CRCs should be identical between the 2 decoded WAV files. Am I wrong ? Because they aren't identical in my case...

[Ney]

Re: CRC errors when re-encoding FLAC files ?

afaik yes they should, that is the whole purpose of lossless. But try and download the trial of reference see what it tells.

[Spoon]

Re: CRC errors when re-encoding FLAC files ?

Install the Referenc Codec Pack, the Calculate Audio CRC does not require Reference.

[LtData]

Re: CRC errors when re-encoding FLAC files ?

WAV files in dMC still have tags unless you disable that feature.