how to convert ac3

i’ve been trying to make use of DVD Converter in order to convert a PAL DVD with AC3 soundtrack to NTSC although the conversion with the video works perfectly, but the. AC3 file produced is actually 0 KB.

i’ve converted the DVD and employed ac3 converter according to the instructions here in the forum and verified the resultant .VOB using QuickTime and VLC (to verify that the soundtrack is present in the rip), but after conversion the only files present are the converted .M2V file and the empty .AC3 file…

what am i doing wrong?