how to check audio type

[Swisha]

hi. im just wondering how can i check to see if an audio file is stereo or mono, etc. i have an ac3 file i demuxed in dgindex but i dont know if its mono or not so im not sure how to encode the mp3 (need mono or not)

thanks!

[Die Kuh macht Muh]

You can use Avisynth's Histogram filter in Stereo mode. If you see a straight line, it's mono. If it looks something like this, it is stereo:

http://avisynth.org/wilbert/pics/histogram_modestereo.gif

There is also a separate program that can tell if a video file has mono or stereo audio, but I forgot what the name was. All I remember is that the author was German and I downloaded the program from his personal website. The Avisynth method should work, though.