I have a good collection of Vedio Songs. some of them are in .mpg file format and some are in .dat format average file size is about 50 MB and there are about 150 such files. I want to compress the vedio files. I know that compressing will reduce the quality of vedio, but as for audio files there is Mp3 file format that can compress file size and maintain the quality of the file, which file format does the same thing for vedio files? I also want to know details of such vedio file formats like : which meida player would support them, which software is best for compression, where to get the software, and other details known to you. It is very urgent as i have to clean my hardisk, by transferring them to cDs, as soon as possible.