I have this one file with this very high frame rate. Tried to change the frame rate using virtual dub, but the film become very slow and made the audio out of sync.

How to slove this problem? I thought just by go to video=> frame rate=>source rate adjustment to where I want and video=>frame rate => frame rate conversion to where I want to will converse the film and audio smothly.

Or I should just choose one of them?

Thanks before hand!