Hello All,
I to have had this problem MANY times, and it dont half get annoying especially if you rip a load of DVDs and queue them all up to encode over night and all day while your at work. Only to return after a hard days graft and find your lucky to have only one or two movies with sound!
I take it were talking about H.264!
The only solution ive come up with is to encode using MPEG-4 Video and not H.264 Video.
Dont know why this works, but so far not a single film hasn't!
I always try with H.264 first and if it fails, (or should I say WHEN it fails) bite the bullet and do it again using MPEG-4! Saves a lot of time trying over and over again to get a H.264 movie. This kinda proves that it can't be any copy protection as the sound is there with MPEG-4! I know his aint the best solution but well, a MPEG-4 with sound is better than a H.264 without!
I just up the bit rate by an extra 500kbps to try and keep the quality up, Im not to bothered about file size.
I hope this helps but if anyone can come up with a better solution I would eternally grateful, as this has been driving me crazy for months.