int (*init)(AVCodecContext *);

    int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
                       const struct AVSubtitle *sub);
     /**
      * Encode data to an AVPacket.
      *
      * @param      avctx          codec context
      * @param      avpkt          output AVPacket (may contain a user-provided buffer)
      * @param[in]  frame          AVFrame containing the raw data to be encoded
      * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
      *                            non-empty packet was returned in avpkt.
      * @return 0 on success, negative error code on failure
      
 
*/
     int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr);
     int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
     int (*close)(AVCodecContext *);
     /**
      * Flush buffers.
      * Will be called when seeking
      
 
*/
     void (*flush)(AVCodecContext *);