int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
AVRational a0={0,1}, a1={1,0};
int sign= (nom<0) ^ (den<0);
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
AVRational a0={0,1}, a1={1,0};
int sign= (nom<0) ^ (den<0);