added parsing of [SIDE_DATA]...[/SIDE_DATA], which contains information about rotation and displaymatrix for some videos#4

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Commits on Sep 14, 2016

added missing import of platform and removed trailing spaces
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Commits on Sep 15, 2016

pep8 and added parsing of [SIDE_DATA]...[/SIDE_DATA], which contains information about camera orientation in some videos. parsing videos with these attributes raised an exception before.
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removed debug prints
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