Optical AC3 Input Delay

Sinorm · May 18, 2005, 05:58 AM

I am using my computer to decode the optical AC3 signal from the cable box which is then outputed to a 5 speaker system through the analog outs. I have an audigy 2 platnium sound card and am using the kx driver's ac3 decoding for the optical input.

The signal is significantly delayed, 300-500ms behind the image. I think there has been a similiar, although less pronounced, delay with movie playback too. Is there a setting or anything that could be causing this? If there isn't a way to get rid of this delay, I will just have to find a different way to setup my system.

**dj_stick** · May 18, 2005, 11:17 AM

the delay may becaused by the actual decoding process

your DVD cable box should have delay options for video to sync av, if not try another decoding device if possible

**Eugene Gavrilov** · May 18, 2005, 11:32 AM

the driver uses WinMM subsystem for decoding ac-3 input, which is relatively slow. re-implementing it via DirectSound might improve performance, although we currently have no plans re-writing this code.

E.

May 18, 2005, 05:58 AM	#1
Sinorm DriverHeaven Newbie Join Date: Apr 2005 Posts: 1 Rep Power: 0	Optical AC3 Input Delay I am using my computer to decode the optical AC3 signal from the cable box which is then outputed to a 5 speaker system through the analog outs. I have an audigy 2 platnium sound card and am using the kx driver's ac3 decoding for the optical input. The signal is significantly delayed, 300-500ms behind the image. I think there has been a similiar, although less pronounced, delay with movie playback too. Is there a setting or anything that could be causing this? If there isn't a way to get rid of this delay, I will just have to find a different way to setup my system.

May 18, 2005, 11:32 AM	#3
Eugene Gavrilov kX Project Lead Programmer and Coordinator Join Date: Dec 2002 Posts: 3,119 Rep Power: 75	the driver uses WinMM subsystem for decoding ac-3 input, which is relatively slow. re-implementing it via DirectSound might improve performance, although we currently have no plans re-writing this code. E.