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Analogue Synchronization Page
Use this page if you have problems with video/audio synchronization.
Controls
Master Stream
Select which stream (video or audio) is the master stream. The master stream dictates which stream the other stream synchronizes to. If you are using a separate video capture card and sound card then the two streams may capture at slightly different rates and hence the audio and video will "drift". By specifying a master stream that all others must synchronize to, this adjusts the frame rate or audio sampling rate to account for drifts in the rates.
To summarize: