How to distinguish re-encoded and real HQ tracks

[Roomboter]

So... Also WAV's will look like this?

[aki]

lol.. made a mix today and accidentally left my mixer in 96 khz sampling rate. I record with audition so I directly analyzed the frequencies.

I only used 44.1 khz files which have a frequency cap at 22050 hz.. look till where the frequencies go

I wonder how this is possible..

[Roomboter]

Aki, I can't send you anymore messages because your inbox is full. :P
Please remove some messages!

[Roomboter]

Okay. I have some tracks Of First State's Changing Lanes Extended Versions. This one is definitely a WAV (Cross The Line):


But this one looks like this (Reverie):


But when I convert it to 320 it looks like this:


There is a difference, so does that mean the first one of Reverie is a WAV? I also have this with Mojave:
This is the ''WAV":


This is the 320 MP3:


Here you see a bigger difference.
But Brave for example is definitely a WAV...
That's why I cannot believe some of the extended versions are WAV and others not.

So I'm just wondering what you guys think!

[aki]

You can see that they are real, because the cut off frequency is not completely 'flat', it has a little 'bolling'.
And with the 320 mp3 you can see that the high frequency peaks look strange, thinned out.

[Roomboter]

Thanks.

[Decebal]

1. Why not use FLAC if you care so much about the quality?

2. I believe, but am not certain, that if an mp3 were to be transcoded to FLAC then it would be obvious from the bitrate of the flac that it is not perfect, so that is another pro