M2T (MPEG-2 Transport Stream) is a video file format mainly used in digital video broadcasts (DVBs) and Advanced Television Systems Committee (ATSC) standards. Initially, it was developed for satellite and terrestrial broadcasts. Today, it’s common in most HD camcorders, and the video is stored in DV and MiniDV tapes. It supports resolutions of up to 1080x720.
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AU is an audio format standard in early web pages NEXT systems. It is also called u-law or Sparc-audio format. Typically, AU files can store audio data and annotation blocks. Initially, it was a headerless audio format, but newer versions have a header, thanks to the six unsigned 32.bit words.