We compress video for the web because uncompressed video is far too big to download. Whenever we compress something, we need to remove image and audio data in order to make the resulting file smaller. Whenever data is removed, image quality suffers.
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Final Cut Pro
[I edit a lot of interviews. In Final Cut Pro X,] I need to be able to view each audio channel at once when picking sound bites because I can see my questions on one channel and the answers on the other and that way I can zip around more quickly the material.