However for the last GOP it might not work for some codecs if we don't copy the whole GOP (although I'm not quite certain of this). So when you start with an I-frame, the whole GOP can be copied to the output file without re-encoding Each GOP starts with an I-frame (A.K.A key frame) which is a full image without any interpolation, followed by B or P frames. The reason is that a video file is split into group-of-pictures (GOPs) that are encoded independently of each other, and contain pictures/frames in the stream. You can also quickly select the I-frame by select the next/prev key frame buttons (shortcut: Up/ Down) The frame type is displayed beside clip time, as you can see Frame type: I-FRM (00) in the below screenshot (although the actual format may be changed, for example Frame:I(02) in older versions) Just remember that you select Copy in the video output instead of any codecs, and the start marker must be at an I-frame It can copy/remux from stream to stream without re-encoding. Avidemux maybe the simplest solution for you.
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