* uint8_t **poutbuf
* int *poutbuf_size
* const uint8_t *buf: 인코딩된 데이터
* int buf_size
* int64_t pts
* int64_t dts
* int64_t pos)
return: int
s = av_parser_init(codec->id);
avctx = avcodec_alloc_context3(codec);
ret = av_parser_parse2(s, avctx, &pkt->data, &pkt->size, data, data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
==== Core functions/structures. ====