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Topic: How to find out if a mp3 is a rip or original !? (Read 40700 times) previous topic - next topic
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How to find out if a mp3 is a rip or original !?

Reply #75 –
I am probably in more agreement with you than you think, pdq.  I hope that you would agree that not one single piece of information touched upon in the initial post can be used to differentiate a lossy-lossy transcode from a lossless-lossy encode with even the slightest bit of certainty.

The only thing that hasn't been successfully refuted are the suggestions made by alondon, which is to say that if the sample lengths of all tracks are divisible by the same magic number it would indicate a lossy-lossy transcode.  Of course this would require that the lossy source did not have gapless information but the next generation transcode did.

I believe spectral plots have been successfully refuted except for special circumstances such as a blade transcode where you would expect to see full bandwidth but didn't.  Let's not forget, however, that the blade encode could have come from a factory-pressed CD that was lossy-sourced.

Of course there is a way to be sure that your mp3s aren't lossy transcodes...

How to find out if a mp3 is a rip or original !?

Reply #76 –
My statement was not aimed at lossy-lossy transcoding, but at whether or not a piece had ever been lossy encoded.

Mainly I am thinking that a spectral plot will sometimes show evidence of some frequency bands being sometimes encoded and sometimes not due to masking.

Edit: typo

How to find out if a mp3 is a rip or original !?

Reply #77 –
Quote from: pdq on
My statement was not aimed at lossy-lossy transcoding, but at whether or not a piece had ever been lossy encoded.

...but that isn't what this topic is about.

How to find out if a mp3 is a rip or original !?

Reply #78 –
He was just clarifying.  Instead of all of the back and forth, can we just lock the thread?  The OP's question has been answered.

How to find out if a mp3 is a rip or original !?

Reply #79 –
Quote from: greynol on
Quote from: pdq on
My statement was not aimed at lossy-lossy transcoding, but at whether or not a piece had ever been lossy encoded.

...but that isn't what this topic is about.

I was responding to ColdRedSnappy's post, which was apparently off topic. Could we delete that whole sequence of posts?

How to find out if a mp3 is a rip or original !?

Reply #80 –
Quote from: pdq on
Quote from: greynol on
Quote from: pdq on
My statement was not aimed at lossy-lossy transcoding, but at whether or not a piece had ever been lossy encoded.

...but that isn't what this topic is about.

I was responding to ColdRedSnappy's post, which was apparently off topic. Could we delete that whole sequence of posts?


hope not, even the silly posts are educational.