问题
ffmpeg can convert the video to specified constant frame rate. It has round parameter to specify timestamp(PTS) rounding method. It could be zero, int, down, up and near.
Given a constant frame rate H.264 mp4 video, how can we determine which PTS rounding method was used to encode this video?
来源：https://stackoverflow.com/questions/63956476/given-a-constant-frame-rate-h-264-mp4-how-to-get-pts-rounding-method-used-durin