ffmpeg 'av_seek_frame()' not work in bink video [closed]

I trying to play video in my game with ffmpeg.

'av_seek_frame()' work fine when i open '.avi' file. but if open .bik file, it's not work and the function just return 0(success) and seek to 0 frame.

anyone who know about this problem? :( please tell me why...

i uploaded sample player and video. this player use ffmpeg and call av_seek_frame to seek. same wtih my program. check it please. https://drive.google.com/file/d/1DVrX3EOzjxSfEA4EYpeSREaE2RLhB28Q/view?usp=sharing