New answers tagged video-editing
Many video codecs encode video frames in two or three different ways: I-frames, P-frames, and B-frames. In short, only I-frames hold enough data to make a video starting point. With -vcodec copy, the software only does this — copying frames. So, if your cut happens at such a time that the chunk starts on an I-frame, it will play fine; otherwise, not. Hence, ...
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