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For syncing audio and video it is always best to leave the video length alone (i.e., don't duplicate or decimate frames). The audio can be shortened or lengthened by quite a bit, without changing pitch, and without a noticeable hit in quality, if you use high-quality audio software. I use Vegas Pro, and once I've changed the audio length, I make sure that Vegas is using the "Elastique" plugin, which produces infinitely superior quality to the stretching plugin that originally shipped with that product.
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