Encode 5.1 PCM to AC3

[Abhijitrox11]

I have Ati radeon hd 4350
It supports either 2 channel audio or Dolby Digital encoded 5.1
Most PC games do not have AC3 format as an option. So please can anyone advise me on how can I encode 5.1 pcm (which I guess is the standard 5.1 format of most games) to AC3.
Please help me in this task thanks.
I have a hometheatre attached to my tv through S/pdif optical output and the tv attched to my PC via HDMI of the graphics card

 

[maddogfargo]

This should not be an issue. 5.1 Dolby Theatre mode should work for you.

However, you could try downloading AC3 Filter to see if it has an option that resolves your issue.

 

[Abhijitrox11]

This should not be an issue. 5.1 Dolby Theatre mode should work for you.

However, you could try downloading AC3 Filter to see if it has an option that resolves your issue.

I dont know how to set up the Ac3 filter. Could you tell me what settings should I set?
Thanks