[MEncoder-users] How to determine size of audio in an avi

[Jason Addison]

> > Is there a way to determine the size of the audio without dumping it to a
> > file?

> >
> > When you play the file, it should tell you both the video and audio
> > bitrates in KBps.  Just multiply by the length of the movie.
> 
> But this will work only in those rare cases where audio is CBR (which is
> uncommon these days) and average video bitrate stored in header is
> accurate, which usually isn't true for MPEG containers.
> 
> So streamcopying to /dev/null is IMHO the fastest and the most accurate
> way.

How do you streamcopy to /dev/null?
Is it like this?
<from section 8.1.10 "Audio">
mplayer source_file.vob -aid 129 -dumpaudio -dumpfile /dev/null
but, then how do you find the size of the file that would have resulted?

Is there a utility that will give all the stats of an avi like the
encoding used for audio and video the sizes of the respective parts,
average bitrate, height/width of the video, ...?

Thanks,
Jason