What capture device are you using? Many USB capture dongles have the audio gain way to high by default, even ones recommended here like the ATI 600 USB. This results in the audio clipping and you get crackling and noise. For many dongles it's possible to adjust it down (in some cases needing to change a windows registry setting.), on a few it's not. Alternatively, many 8mm cameras have headphone outputs where the volume can be adjusted, which could be used (with a minijack to rca adapter) to lower the volume a bit.
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