#define AVFMT_FLAG_FAST_SEEK 0x80000 ///< Enable fast, but inaccurate seeks for some formats
#define AVFMT_FLAG_SHORTEST 0x100000 ///< Stop muxing when the shortest stream stops.
#define AVFMT_FLAG_AUTO_BSF 0x200000 ///< Add bitstream filters as requested by the muxer
+#define AVFMT_FLAG_METACUBE 0x400000 ///< Wrap output bitstream in Metacube (for Cubemap)
/**
* Maximum size of the data read from input for determining