There are other factors besides the CFE/PBR relationship that can break sync (like dropped frames due to computer disk and pageswap I/O activity and such - realtime capture is a very demanding task on the poor processor!) But this one move has helped many people overcome audio lag completely (as seen in the comments on my old video about this subject at YouTube: ) This does not negate the fix using VirtualDub mentioned above at all, but it might make the repair unnecessary for most people's situations. since trying for a Playback Rate of 30 fps allows for only a non-fractional setting of 33 in the CFE, you wind up with a multiplication result of 990, which would guarantee a lag would be introduced over time that would get worse and worse. Experiment here! The key issue is how the math is performed. Since the typical ACTUAL possible frame capture rate is usually around 10 to 20 fps, one would think that setting to CFE 100/PBR 10 would be the best (and it might be!) But you can push your machine to perform a little harder by setting higher figures here in the Playback Rate, say like CFE 25/PBR 40 or even higher (20/50, 10/100, etc.). (Note: The first two are time-lapse settings, the first one capturing every second, the second one capturing every half-second.) ( * marks those which are perhaps most practical.) This limits the available "Capture Frames Every" (CFE) and "Playback Rate" (PBR) settings to the following: (In speculation, this may be because audio uses an H:M:S:mS framework while video uses an H:M:S:F (F for "Frames") timing system.) Since CamStudio does not allow for decimal settings in its setting of "Capture Frames Every", another factor necessary to consider to stay in sync is the relationship of the "Capture Frames Every" setting to that of "Playback Rate" The two, when multiplied, must result in an even number of 1000 (1000 milliseconds, or one second).
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