[all variants] converting various video type files in to one type and resolution

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http://ubuntuforums.org – I am looking for a solution to convert many(~50GB) video files of various types placed in subdirectories in to same subdirectories but one video type and one resolution any one know that application could do that automatically or app+bash script (I just don't won't to covert every single video file one by one) (Hardware)