hello, how can i change (hack) framerate value of video file,
(my code can open read  writes video frames)
i try change to 7 fps, like this, but does not work.

AVFormatContext* m_ou_avformat_ctx;
m_ou_avformat_ctx->streams[0]->r_frame_rate.den =7;
m_ou_avformat_ctx->streams[0]->time_base.den = 7;
m_ou_avformat_ctx->streams[0]->codec->time_base.den = 7;

Thanks
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