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:About Audio And Video Format
Audio can be stored uncompressed, as with .aiff and .wav files. Lossless compression schemes, as used in .flac files, preserve the original sound quality by only removing unnecessary and redundant data. MP3, by far the most popular audio format, removes data using a lossy scheme which results in a slight loss of audio quality but significant compression. The AAC format is capable of better audio quality than MP3 at the cost of less compression
As with all media formats, video formats run the spectrum between high quality and low file size. Lossless compression for video files attempts to reduce the file size by removing redundancies. Lossy compression schemes reduce filesize by discarding data without the viewer noticing. The Advanced Video Coding (AVC) standard is one of the most commonly used formats for recording, compressing, and distributing high definition video