It is well known that mencoder can be used to encode video to be burned on DVD with a tool like dvdauthor. The whole procedure is described here:
7.8. Using MEncoder to create VCD/SVCD/DVD-compliant files
Sound for a DVD is normally encoded with AC3. I encountered some cases where the encoded sound was badly distorted. As it seems, the default for the input changed to float at some point. The fix for this is to use
acodec=ac3_fixed
instead of “acodec=ac3”.
This is just for the record, not a question.