Finding an mpeg of the right type is easy, it was produced with the first process. The mpeg must have audio otherwise for some reason you lose the speed savings and the audio must be nothing but silence because Nero doesn't replace the mpeg audio with the audio you add to the timeline but blends it together. What you need it an mpeg file that has the same parameters as the one that was produced by the above process. If there's any value in the process but you would like to speed it up you can. Congratulations you now have your AC3 file and you can stop reading right here. You can also delete the mpg file but before you do make sure you don't want it for the procedure below. mpg file, you can do this with TMPG's mpeg tools, virtualdubmod, or I'm sure there are other freeware tools available. When it's done just strip the audio out of the. On my PIII 933mhz computer the conversion is slower than real time a 1 hour audio file will be processed in about 1.5 hours. Click OK, you can now change the output file path and name if you wish. We now want to configure it for the lowest quality fastest rendering video we can since we only want the audio so select Quality setting: Super long play, Resolution: Fast encoding (1-pass), and Audio format: Dolby DIgital (AC-3) 2.0.
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Click configure, select the DVD-Video tab at the upper left. Click export, make sure the template in the drop down box is DVD. wav file (I think other formats are accepted) to Audio 1 in the timeline. Open NeroVision Express and select Make New Movie, not Make DVD. You can make it go faster but it takes some more preparation. It probably won't appeal to very many users because of it's drawbacks: it will only make two channel AC3s at 192kbps, it's a little messy it makes an mpeg2 file that then needs to be demuxed, and it's slow because it makes a dummy mpeg2 file while converting the audio. It's big advantage is that a lot of people already have Nero, if you don't own it it's a lot cheaper than a "proper" tool to convert audio to AC3. This is not an ideal audio conversion tool, of course that's not what it's designed to be.