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dialnorm

An AC-3 metadata parameter, numerically equal to the absolute value of the Dialog Level, carried in the AC-3 bit stream. This unsigned 5-bit code indicates how far the average Dialog Level is below 0 LKFS. Valid values are 1–31. The value of 0 is reserved. The values of 1 to 31 are interpreted as –1 to –31. The decoder applies an amount of gain reduction equal to the difference between -31 and the dialnorm value.

Source: 85

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