I’ve been trying to rip just the audio stream from each chapter of a DVD I have, but none of the tools I’ve tried so far (transcode, mplayer) seem to work, and just produce noise instead. The disc uses 48khz 24-bit PCM audio, but it keeps getting detected as 16-bit, and the programs don’t even seem to support 24-bit audio at all.
Maybe if I can at least get the raw PCM stream I can manually massage it into a usable form, but it looks like other useful conversion tools like ‘sox’ don’t support 24-bit audio either. Maybe I should just write a trivial app to just knock every third byte off…
Update: Worked around it by playing it in the DVD Player on the iBook and capturing the audio with WireTap (found via Matt). I’m still lacking an automated batch method, but this is good enough for the one chapter I really wanted for now.