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/* IDs in the blockgroup master */
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#define MATROSKA_ID_BLOCKDURATION 0x9B
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#define MATROSKA_ID_BLOCK 0xA1
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#define MATROSKA_ID_REFERENCEBLOCK 0xFB
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/* matroska track types */
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#define MATROSKA_TRACK_VIDEO 0x01 /* rectangle-shaped pictures aka video */