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The default MaxGOP size = 10 x Output FPS.
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Yes, that is what most encoders use.
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But for 30 fps 10 seconds scene change would be 300 frames, right?
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Max GOP doesn't mean there is a scene change. Max GOP size is more like: If there hasn't been a key frame because of a scene change for X frames, force a key frame to ensure better navigation inside the clip. If you don't care much about navigation inside your content using larger GOP sizes and/or OpenGOP will probably yield better compressibility.