mp4 The MP4 file format and the .mp4 filename extension refer to the MPEG-4 part 14 digital multimedia format developed by the Moving Picture Experts Group. It is used as a multimedia container to wrap encoded digital video and audio streams, including subtitles and still images if required. In recent decades, the format has been popularized as one of the main standards for streaming media over the internet and other computer networks and for the digital distribution of large multimedia files. MP4 supports a large number of compression audio codecs allowing files in this format to maintain a relatively small size without discounting playback quality.
swf SWF extension referred to as 'Small Web Format' is a file extension used exclusively in web applications integrated with Adobe Flash Technology. SWF files are used in multimedia, web applications, vector graphics, and ActionScript. Browser games frequently make use of SWF files.