venassa huge

Recently I have so many audio or video files to be converted to be compatible to my different portable devices. I used to download one specific software to convert for my iPhone, and another software to convert for my Pocket P.C, and then the other……I was really annoyed….is there any all in one video/audio converter software that can help me handle all those trifle things?? P.S: I want the videos to be converted with high quality. Thanks! Linda