Adds LKFS attribute and allows loudness normalization in transcoding #185
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…n when transcoding
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This pulls LKFS and related loudness data and sets them as attributes on the movie object. It also calculates the two-pass loudness normalization formula based on these inputs to normalize the movie to -24 LKFS. This can then be as the input to normalize_loudness during transcoding (see updated readme example).