Mp4 iTunes ''video fine but NO Audio''

Hi, I just convert 1,500 DVDs (concerts, videos and Tv series) into Mp4 using Nero Recode with no problems, everything is perfect when I play, tag, etc. my Mp4 in iTunes, but now Im in the process to covert 300 DVDs movies into Mp4 but when I try to play this new Mp4 into iTunes I have no audio, if I play this Mp4 in Nero showtime, VLC, winamp, etc. I have audio but in iTunes/QuickTime I have no audio
Please help me, thanks in advance
AMDAthlon64x2DuaCore44002gbRAM*300gbSA2*SP2*NvidiaNX6600AsusA8N32SLIDeluxe Windows XP AMD Cool N Quiet driver

Ok I know whats the problem is:
The first 1,500 DVDs (this Mp4 have no problem) I convert at 2 chanel stereo 448kbps and the seconds 300 DVDs movies (with no audio) I convert in AC3 5.1 at 640kbps
I realize because I rip to my HD one of the movies with no audio and convert in 2 channel stereo and this one have audio
The problem is AC3 5.1... do you have any idea to solve this because I dont want to re-convert again the 300 Mp4 files
Do you think if I purchase QuickTime Pro can solve this problem?
If not, if I recode again I will loose audio and video quality?
Regards

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