So Strange : Video Fine but Audio Prob :((

I've encountered a strange problem in my search for best settings for videos.
For H264 encoding, I tried using settings of:
768 Kbps(video) + 160(audio)--> iTunes transfers to iPod, but iPod just displays black screen for 5-10 secs, and then go back to menu. Settings for as low as,
384 Kbps(video) + 160(audio)--> iTunes transfers to iPod, but iPod just displays black screen for 5-10 secs, and then go back to menu.
But Strangely, video bitrate isnt the problem, since playing with the audio settings i find,
768 Kbps(video) + 96 Kbps(audio) runs fine on iPod, whereas
768 Kbps(video) + 128 Kbps(audio) gives the same problem as above, i.e. video transfers to iPod but doesnt run on it.
For all the above settings, when iPod is connected to PC I am able to run the video from iPod on my PC. But the video just wouldn't run on the iPod until I use a lower audio bitrate, which *** for music.
Note: BTW I use Videora for encoding my videos.
Intel Pentium4   Windows XP Pro  

By "toslink" do you mean digital optical cable?  I have tried running a digital optical cable from the ATV to the Sony receiver along with the HDMI cable from the ATV to the Sony reciever and still did not get sound our of the receiver when on the receiver is set play for the HDMI port selected. 
Here is the thing.  I have Blue Ray player with a HDMI cable running into the Sony Receiver port and a digital optical cable running from the same Blue Ray player to the Sony Receiver and the sound is fine.  I was doing the same thing with the ATV (but using the DVD port on rhe Sony Receiver for the ATV).

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