In most computer systems, an ordinary text file consists of a linear sequence of bytes without any structure that the OS knows about or cares about.
Now, with multimedia files, the situation becomes more complicated.
Therefore, to start with multimedia files, audio and video are completely different. They are captured by some distinct devices (CCD chip versus microphone), have a different internal structure (audio has 44100 samples/second and video has 25-30 frames/second), and they are played back by different devices (monitor versus loudspeakers).
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