Whenever you re-compress video, the quality suffers. You can then make lower-resolution files as necessary, but you always have the high-quality master to fall back on. For example, if you begin with footage shot in the HDV format, use appropriate HDV settings in your editing software and create your master version in the same format. Ideally you should begin with a high-quality source and keep it consistent throughout the entire editing process. You should check your source video to see what settings it uses, then make sure your editing project uses the same settings (unless you have a good reason to change them). In particular, take note of the following parameters. There could also be settings in the program's preferences and other places.
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