MP4 or mpeg-4 is a very common digital multimedia format typically used for audio and video files. MP4 files are also a common file to use for streaming video over the Internet due to its compact file size. In order to watch or view these files types on your pc, a mp4 player is absolutely necessary. SDR Free MP4 Player is just the video software tool you are looking for. With a quick download and installation you'll be able to watch all your mpeg-4 files instantly. There is no need to download any extra codecs or audio/video plug-ins; right out of the box you'll be up and running.