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Topic: Are these two wav files the same? (Read 4324 times) previous topic - next topic
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Are these two wav files the same?

My Hd partition accidentally got erased and reformated a couple of weeks ago, so I found a program that successfully restored all the files. These were FLAC files and afterward they played with no problem. But just for the heck of it I took a song and unflaced it and used EAC to process the wav file. Then I took the original CD and ripped that same song again to compare it with my unflaced file. I used the option called 'Compare with External Wav' and I got this result as an error '48 repeated samples at position 0.00.00.0196'. What does this mean?
Cowon Iaudio X5 30 gig. It rocks!

Are these two wav files the same?

Reply #2 –
Yes...you hit that one on the bulls eye.... I have an NEC DVD burner. What exactly does this mean when the samples are repeated? and do I need to buy a new Ripper to get more accurate rips?
Cowon Iaudio X5 30 gig. It rocks!

Are these two wav files the same?

Reply #3 –
Quote from: darin on
Yes...you hit that one on the bulls eye.... I have an NEC DVD burner. What exactly does this mean when the samples are repeated? and do I need to buy a new Ripper to get more accurate rips?


You could use a wave editor (EAC used to come with a simple one iirc) to look at the reported samples. My guess is that they will be all null samples, since EAC has an option to pad missing samples (due to offset) with silence. So I'm guessing one of your files was padded, and the other wasn't.

BTW, the quick way to check if your flac file has been damaged, is to get the command line flac tool and do "flac -t filename.flac" (where -t means test...).

Are these two wav files the same?

Reply #4 –
Quote from: Patsoe on
You could use a wave editor (EAC used to come with a simple one iirc) to look at the reported samples. My guess is that they will be all null samples, since EAC has an option to pad missing samples (due to offset) with silence. So I'm guessing one of your files was padded, and the other wasn't.

They probably are null samples but they aren't being padded by EAC.

The stated position of the repeated samples clearly shows that they are at the beginning of the track.

With this drive, only the last track will be padded and the padding will come at the end of the track.  Every other track will steal 48 samples from the beginning of the next track and the first track will simply start 48 samples later.  The samples that are repeated actually exist on the disc this way.  They weren't created by EAC.

Are these two wav files the same?

Reply #5 –
If this is the only error, it also means that one file is shorter than the other. Maybe you disabled overread while enabling offset correction.

Are these two wav files the same?

Reply #6 –
Quote from: Pio2001 on
If this is the only error, it also means that one file is shorter than the other. Maybe you disabled overread while enabling offset correction.

A shift in data will result in a single error.
If there is a shift in data and one file is shorter, two errors will be given saying there are repeated samples and one is longer than the other.

The only funny thing I see here is that Darin gave the time to four decimal places.  EAC only goes to three.  Assuming that the time EAC gave was actually 0:00:00.196 and not 0:00:00.0196, I was able to recreate the same message by silencing the first 0.196 seconds of a file that began with nonsilent samples and making a copy of it shifted by 48 samples but still of equal length.

EAC ignores the samples at the end when comparing two files that only differ by a relative shift.