When call av_seek_frame with AVSEEK_FALG_BACKWARD, its expected behavior should be seek to "backward" keyframe of requested time.
But sometimes, it seeks to its "next" keyframe, not "backward". (might be when the requested time is just ONE frame before the time of its next keyframe, see https://stackoverflow.com/questions/20734814/ffmpeg-av-seek-frame-with-avseek-flag-any-causes-grey-screen ) Is this an expected behavior? if then, what is the correct way to seek to its backward keyframe?
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