Turn off usage of base_data_offset in tfhd for PIFF files
According to the PIFF specification[1] the base_data_offset field MUST be omitteed. See section 5.2.17. Since the ISMV files created by ffmpeg state that they are 'piff' compatible via 'ftyp' box, this needs to be corrected. [1] http://www.iis.net/learn/media/smooth-streaming/protected-interoperable-file-formatSigned-off-by: NMichael Niedermayer <michaelni@gmx.at>
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