Audio quality of camcorders and other needed features

Which of the camcorders out let you choose and adjust the audio
format you want to use?
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Could camcorders out there record MP3 audio at, say, 44.1kHz/160kbps
per channel?
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Also two other features I would like to have are:
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being able to use a power cord instead of having to always use
batteries, and
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streaming the recorded data directly to a PC instead of using a
memory card or a DVD-RW
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thanks
lbrtchx