s->max_qdiff= 3; s->b_quant_factor=1.25; s->b_quant_offset=1.25; s->i_quant_factor=0.8; s->i_quant_offset=0.0;
void avcodec_get_context_defaults(AVCodecContext *s){    s->qmin= 2;    s->qmax= 31;    s->rc_eq= "tex^qComp";    s->qcompress= 0.5;}