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In theory, if the number of keyframes and their placement were about the same, as decided by the encoder, then yes, you can reduce the bitrate to half and retain the same quality. In practice, the encoder may be configured to place a keyframe every N seconds, in which case, you should use a bitrate a bit higher than half the original bitrate, say, around 55%....


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I just changed the title to focus on high-speed videography, which is a much, much narrower topic than videography (and cinematography) in general. The basics are these: due to persistence of vision, the eye can be fooled into interpreting a series of still images as if they are continuous motion at around 16 frames per second. There are a variety of ...


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Ok this question should probably be put on hold as it is way too broad for a single answer. If I understand you correctly, you're asking about both the technical and artistic aspects of both photography and videography, topics which people study for years in universities. So if you really want to learn all that stuff, sign up for a course at an university. ...


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Based on all info, it looks like the difference occurs with FFmpeg's internal MPEG-4 part 2 encoder, whose use can be identified by the string mpeg4 (native) after the 2nd arrow in Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native)). If you use libxvid which is a third-party MPEG-4 part 2 encoder, the error does not occur. My guess is that the ...



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