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There are several sources of difference, but you should be able to handle them all with some work. The first difference will be depth of field. A full frame camera has a shallower depth of field at a given angle of view because it can achieve the same angle of view with a longer lens. You can compensate for this by using a smaller aperture (higher ...


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Other people have already given a very good way to do these things one video at the time. But if, for whatever reason, you definitely need to do everything at once, you can use libav to do that. Here is the example command with 4 files: avconv -ss 10 -i 1.webm -ss 10 -i 2.webm -ss 10 -i 3.webm -ss 10 -i 4.webm \ -map 0:0 -map 0:1 -c:a copy -c:v copy ...



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