i was wondering sometimes i dl some tracks of the net, then i dl a higher bitrate version from a song sometimes.

But is it possible to see if someone didnt transcoded the song from 192kb/s to 256 or something?

i already have mr questionman and encspot, but i didnt really find something usefull

Sometimes you can see it in a spectral view with a WAV editor. If a 192 or 256 file has a lowpass of 16 kHz (which is typical for 128kbps), it's probably not an original encoding - but there may be exceptions to this, as e.g. some encoders like the old l3enc (IIRC) always use a lowpass of 16 kHz even at 320 kbps.

You can use foobar and your windows calc to check it(or a foobar plugin).
http://www.hydrogenaudio.org/forums/index....ndpost&p=313839

This is what exactly what I do, I've seen files encoded with Lame 3.90.3 APS that have a 16Khz lowpass, that means either the file is trans/reen-coded from a lower quality file or someone changed the lowpass during the original encode.

ok thank you people this will help me out for a while

edit: or there must be other ideas ofcourse

only works with properly encoded Lame files that got the headers and everything. See tread for details.

I wonder...is it possible to somehow "batch check" this, on large number of files at once?
For my needs it would suffice if I could know in an automated way which of my files are for sure not transcoded, and than look closer at the rest.

Yep, thats why I linked to the thread and not only copied the method. And its still what zima is looking for, except for the batch check. "way which of my files are for sure not transcoded, and than look closer at the rest."

But I just think if you are downloading files and thing they are good in your equipment, you dont need to be so paranoid about transcoding.

Mostly the latter, I hope.

Over the years, it's been somewhat popular to use -Y or --lowpass 16 with APS.

I thought there was software for this, and a search revealed that there is. I think this might help: http://www.hydrogenaudio.org/forums/index....etect+transcode

That's just meant for differentiating between CDDA and MP3 encodes (which it does quite well IMHO), not between MP3 and transcoded MP3.

Oh well, I guess I'll have to do it manually...or perhaps there is some foobar plugin developer wanting to automate this task a bit?

Basically you're right, I just want mostly to exclude such files from further circulation...
(BTW, I hope discussing it on such vague level doesn't violae TOS...)