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Just to add a bit to AJ Henderson correct answer. You do can compress in a lossless way with h264, this is the lossless predictive profile and is achieved by encoding with a CRF setting of 0. Though while you get lossless h264 compression that way you will endup with a larger file than your source file. Lossy compression cant be done twice without loosing ...


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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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