Converting MP3 in console (linux): convert MPEG 1 layer III v2 to MPEG 1 layer III v1

hello
I'm new user in this forum. (I rather speak english slightly)
I need convert (mpeg-2) mp3 (audio) to (mpeg-1) mp3 (audio) in console (linux), please help me.
Exemplary file and after errand result file :

$ file Pornoheft_-_Tschechien.mp3 
Pornoheft_-_Tschechien.mp3: MPEG ADTS, layer III, v2,  96 kBits, 22.05 kHz, JntStereo

It is possible to collect file from http://up.wklej.org/download.php?id=...f80c293ae6a50a

MP3 is MPEG1 layer III, so it is hard to understand what kind of conversion exactly is needed.

I need convert files which are mpeg-2 (mp3)

$ file Pornoheft_-_Tschechien.mp3
Pornoheft_-_Tschechien.mp3: MPEG ADTS, layer III, v2,  96 kBits, 22.05 kHz, JntStereo

to mpeg-1 (mp3) - example:

$ file STAGNATION_IS_DEATH_-_XVIII_Europejska_forteca.mp3
STAGNATION_IS_DEATH_-_XVIII_Europejska_forteca.mp3: MPEG ADTS, layer III, v1, 128 kBits, 44.1 kHz, JntStereo

in these codes v2=mpeg2, v1=mpeg1

Originally Posted by stahoo23

I need convert files which are mpeg-2 (mp3)

$ file Pornoheft_-_Tschechien.mp3
Pornoheft_-_Tschechien.mp3: MPEG ADTS, layer III, v2,  96 kBits, 22.05 kHz, JntStereo

to mpeg-1 (mp3) - example:

$ file STAGNATION_IS_DEATH_-_XVIII_Europejska_forteca.mp3
STAGNATION_IS_DEATH_-_XVIII_Europejska_forteca.mp3: MPEG ADTS, layer III, v1, 128 kBits, 44.1 kHz, JntStereo

in these codes v2=mpeg2, v1=mpeg1

I say again: MP3 is MPEG 1 layer III. And I don't really know the difference between v1 and v2. May be MP3 and MP3 Pro??? May be ID3 v1 and v2. Anyway you can try to convert both files using mencoder.