Convert downloaded 1920×1080 .TiVo to 1280×720 MP4 for watching on iMac/Mac2Tivo

I just got my Tivos and primarily want to convert my downloaded .TiVo files so I can watch them on my iMac, or later upload them to TiVos for watching later after the original TiVo movie was deleted. Any apps recommended? Plus, I work on my iMac and for Mac2Tivo and I need to convert my .TiVo files which are 1920x1080 to 1280x720 to save room. As you see, uses usually have Tivo playback pro...
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