The MOV file format is most commonly associated with Apple and the QuickTime video clip. The file format was developed by Apple as was QuickTime Player, it is compatible with both the Microsoft and MacOS platforms. MOV files are capable of storing two or more tracks which can be video, audio, text, graphics or effects. This flexibility makes this file format very popular for music and video editing.
MOV files use a proprietary compression algorithm and each track that is held within the file is made up of an encoded media stream or a reference to a media stream that is located in another file - this allows the embedding of existing media. QuickTime player which was developed and created by Apple allows a user to open and play .MOV files and later version of QuickTime Player, such as QuickTime Pro allows the user to edit and export .MOV files.
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AAC is similar to MP3. It essentially cuts out, or compresses, information that the human ear cannot pick up thereby making digital files smaller and more easily managed and therefore quicker to download. AAC is about half the size of MP3 but with better quality. It is at least one tenth the size of CD digital data. Apple are the biggest users of this format and if you have an iPod or iPhone then you will have come across this format as it is iTunes default audio format.
AAC is similar in concept to MP3 but goes further. It too compresses digital audio files but to a bigger degree. It is also part of the MPEG-4 standard, it is most widely used to create small digital audio files. The current variant is specified in ISO/IEC standard 14496-3. Like MP3, AAC is a lossy algorithm. The human hearing system cannot hear quiet sounds in the presence of loud sounds of a similar frequency; for example, a voice conversation cannot be heard while an aeroplane flies low overhead. This is known as auditory masking, this allows the discarding of data with minimal loss of quality.
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