I have a dvd whose audio file must be replaced, after getting .vob from osex I used ffmpegx to demux, the result is .m2v and .ac3 files and I can successfully alter the ac3 to an aiff or wav. file in ffmpegX but when I try to reverse the process (.wav or same aiff )back to ac3 I get the following message (in the info window) and no audio in file: Duration: 00:00:00.-2, start: 0.000000, bitrate: -2004991 kb/s
Stream #0.0: Audio: pcm_s16le, 44100 Hz, stereo, 1411 kb/s
Could not find input stream #0.3


Any ideas?

Thanks

Ray