An AMC file is a video file created in the Adaptive Modulation and Coding (AMC) format. It is designed for transmitting multimedia data between mobile devices.

You will most likely only encounter AMC files if you use a mobile device that utilizes cellular services provided by the KDDI Corporation, which is a Japanese telecommunication operator. The AMC format is a variation of the more common 3GPP format (.3GP files) that allows video quality to be negotiated based on the channel conditions between cellular devices. If you do acquire an AMC video file, you can play it with Apple QuickTime Player and PEGASYS TMPGEnc MovieStyle. However, due to limitations with the AMC format, recorded audio may not be played with the video.