File extension AMV
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File extension AMV is a proprietary video format produced specifically for use with MP4 media players as well as File extension MP3 devices with video playback facilities. AMV files use a modified version of the File extension AVI file container, and consist of a RIFF (Resource Interchange File Format) video and audio stream. The video is a modified variant of motion JPEG (M-JPEG), meaning that each video frame is stored individually as a compressed File extension JPEG image. The audio is a modified variant of IMA ADPCM (Interactive Multimedia Association Adaptive Different Pulse-Code Modulation), which is a standard way of converting analogue signals to digital audio for use in computing applications.
Due to the low specification nature of the processors in portable media devices, particularly in video-enabled MP3 players, AMV files contain very little compression to minimise overheads and allow smooth playback. They also make use of a very low resolution ? anywhere between 94 x 52 and 208 x 176 ? and a low frame rate ? either 10, 12 or 16 frames per second (FPS). This results in relatively small file sizes, and combined with the lack of compression, require relatively little processing power to play, making them ideal for portable media devices. A thirty minute video clip with audio would typically be as little as 80MB in size once converted to AMV format.
A common misconception is that the AMV file extension stands for Anime Music Video. Whilst the AMV format can be used to store this, or indeed any other type of video, it was developed primarily to store music video clips for use on portable media players.
AMV files can be opened using MP3 Player Utilities or AVS Studio, which also include the AMV Video Converter tool. This allows the conversion of any video file to the AMV format for use on compatible media players.
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