It does. M4V是苹果的 MP4变体,有时附有FairPlay DRM,否则结构上是MP4. That is precisely what decides whether a cut can be placed arbitrarily or has to land on a structural boundary.
修剪时有什么具体关于 M4V 的具体信息吗?
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Yes — M4V在结构上是MP4,但受公平保护的PairPlay保护的M4V根本无法处理,只有无保护的文件才能通过. It explains most of the "the cut is a fraction of a second off" surprises.
