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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