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You have a misunderstanding of how compression works. In all but a few specialized types of lossy compression, when you compress something a second time, even in a much higher quality level than previous encodings, you still lose additional quality. Using a slower encoding from the same original source with constant quality will often produce a smaller ...


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The first thing I would try is to add -force_key_frames to your original command, drop the preset and lower the -crf value. The following example sets a key frame every second. ffmpg -i input.mov -c:v libx264 -profile main \ -force_key_frames expr:gte(t,n_forced*1) \ -crf 15 -pix_fmt yuv420p -an output.mp4 As a second resort I would use a series ...


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I've answered a similar question some time ago. YouTube added a few codecs since then but all the info there still applys: What codec will my Youtube uploads be output in and what codec should I use to upload? Short answer: Yes if you are concerned about maximum quality a lossless codec or visually lossless codec is the way to go. Re-encoding always means ...



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