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[666JackTheKnife666]

when I play a dvd or mkv pretty much any video my audio is behind by about 3 seconds.

you see an explosion 3 sec or so later you hear the boom. how can I fix this ?

thank you.

[JimH]

Try setting video to Red October, and make no other changes.  Does that work?

Run the benchmark program under MC Help and paste the results here.

You could read about "Videoclock" here, but 3 seconds is an unusually long delay.  Something else may be wrong.

[666JackTheKnife666]

This machine is plenty quick 2500k OC to 4.5 ghz 16gb ram VC Nevidia 560 win 7x64.

=== Running Benchmarks (please do not interrupt) ===

Running 'Math' benchmark...
    Single-threaded integer math... 2.995 seconds
    Single-threaded floating point math... 1.991 seconds
    Multi-threaded integer math... 1.499 seconds
    Multi-threaded mixed math... 1.016 seconds
Score: 2533

Running 'Image' benchmark...
    Image creation / destruction... 0.638 seconds
    Flood filling... 0.329 seconds
    Direct copying... 0.600 seconds
    Small renders... 1.689 seconds
    Bilinear rendering... 0.870 seconds
    Bicubic rendering... 0.807 seconds
Score: 4460

Running 'Database' benchmark...
    Create database... 0.362 seconds
    Populate database... 1.008 seconds
    Save database... 0.113 seconds
    Reload database... 0.026 seconds
    Search database... 0.957 seconds
    Sort database... 0.816 seconds
    Group database... 0.607 seconds
Score: 5530

JRMark (version 17.0.82): 4174

[Matt]

Could you describe your audio output, hardware, and DSP used? 

One possibility is that you have set the primary buffer size too high in Options > Audio.  With a fast computer like yours, use WASAPI - Event Style or ASIO with a 50ms or less buffer.

Another possibility is that you're using a third-party DSP that adds a delay.

You can also configure for external hardware latency using Options > Video > Advanced > A/V sync correction.