而 Smart cut 指向 https://github.com/mifi/lossless-cut/issues/126 这个 issue: We cannot cut between keyframes, it's a technical limitation of modern video codecs. So ffmpeg will choose the nearest keyframe, which will not be the exact time you requested.
到 Dec 15, 2022 还有人在回复: After cutting several hundreds of h.264 videos with smart cut, I noticed that an average of over 50% of them does not work very well.
这个 issue 现在也还是 open 的,所以基本可以认为 LosslessCut 在两个关键帧之间的位置精确剪切这个功能,现在应该还没做好。