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KMS mdoe in Linux is another option. You avoid all of this with KMS and DRM/EGL - you are in control of your front and back buffers and dont have to rely on API magic - so you know exactly where and when a frame was dropped and how to act accordingly with that in mind. You might need to get the latest drivers if you have an AMD card or else KMS mode will suck. I don't know how far along Nvidia is by now. Intel should be fine.
``mdoe'', MDOE? Redundant sentence removed.
There is video latency caused by the GL drivers in WIndows/Linux. It is a total black box and they do all sorts of crazy buffering schemes under the hood for all sorts of purposes - better scores with benchmarking tests, better "game" results - but it is actually counterproductive when your aim is low-latency audio/video synchronization for emulators - you don't want all this stuff going on in the background. This applies to both GLX X11 drivers and Windows GL/D3D drivers - both are full of bad hacks and codepaths that cater to benchmarking apps and games.
Hard syncing optionin option in some emulators can reduce or remove this.
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