Some kinda really tweaked miniDVD might be the solution -- create a blank video clip, same length as the audio and encode it to MPEG-2 with extremely low bitrate, which leaves more space to audio and then author a new miniDVD using SpruceUp and burn the thing to CD and pray that your specific player agrees with the idea to play that _DEFINATELY NOT VALID WITH ANY STANDARD :-)_ CD. Should work anyway :-)
Yes you can do it, you need to encode your AC3 file to Dolby Digital WAV. This will leave the complete full bitrate 5.1 sound intacted. Note that you will only be able to fit 74 or 80 mins of audio on the CD thou (depends on the size). I have been able to encode SVCD mpeg file with Dolby Digital. I can get them to play correctly on my computer but my Home Theater system will only play the video... any ideas? If you COULD get them to work with a mpeg file without video you could keep the compressed AC3 format thus saving you TONS of space.
Thorpin: SVCD standard doesn't support AC3 audio and therefor players are not even supposed to play 5.1 audio SVCDs -- only multichannel audio that SVCDs can contain according to specs is multichannel MPEG-2 audio and finding a decoder for that format is extremely difficult.
Well, yeah.. PCs play pretty much anything -- standard or not. Heck, if DVD players would do that, I would drop SVCD as a format quickly and start using 2CD DivXs, but as I like the idea to have good quality _standard_ files, I prefer SVCD.