WWW.vcdhelper.com is the best place for help
you can convert a asf file to mpeg format and then use either nero or easy cd creator deluxe to author you VCD.
The best program to use for this is TMPGEnc, and to the previous reply yes vcd format is not the best Svcd is but i have not started to do that yet so there is very little help i can provide on that subject
Ive done some standard VCD and standard SVCD. This is what You can get in the different methods on a 80 min CDR. All with GOOD quality viewed on a TV through a decoder card
VCD CBR 80 minutes (Flask + Pana plugin)
SVCD CBR 40 minutes (Flask + bbMPEG)
SVCD VBR ca 70 minutes (Flask + bbMPEG)
and just now Im study an other interesting altarnativ, its
VCD VBR (max 2200b/s). Its looks VERY good and its possible to fit 120 minutes on one CDR. (Flask + bbMPEG).
Ive only done some tests with MPEG4, and all I seen is less quality than all above.