Defined in avformat.h

typedef struct AVPacket {
    int64_t pts;                            ///< presentation time stamp in time_base units
    int64_t dts;                            ///< decompression time stamp in time_base units
    uint8_t *data;
    int   size;
    int   stream_index;
    int   flags;
    int   duration;                         ///< presentation duration in time_base units (0 if not available)
    void  (*destruct)(struct AVPacket *);
    void  *priv;
    int64_t pos;                            ///< byte position in stream, -1 if unknown
} AVPacket;

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