AVRational src_time_base = (AVRational){1, 25};
AVRational dst_time_base = (AVRational){1, 90000};
int64_t pts = 2;
int64_t new_pts = av_rescale_q(pts, src_time_base , dst_time_base);

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AVRational src_time_base = (AVRational){1, 25};
AVRational dst_time_base = (AVRational){1, 90000};
int64_t pts = 2;
int64_t new_pts = av_rescale_q(pts, src_time_base , dst_time_base);