Media Converter (Mac only) is out for some time, but apparently only few people use it. It's based on ffmpeg and it's a very useful tool providing high quality conversions. It's available in 32 + 64bit. You can built your own presets for a large varity of formats (video + audio). I've attached my settings (conversion to QT MOV) for the various DNxHD codecs. Avid MC will fast import the movies.
http://media-converter.sourceforge.net/
There are also presets on the website, including a preset for fast re-wrapping AVCHD to H264 mov: http://media-converter.sourceforge.net/presets.html
Have fun!
I have just noticed this myself (last 2 weeks). Very useful! Especially with the newset FFMPEG!
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