(and 3.) Concatenating multiple streams can be done by concat filter:īelow command will merge three video sreams (will drop audio streams if thay exist):įfmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex concat=n=3:v=1:a=0 -map OUTPUT.
so if you want resize your input video and preserve Aspect Ratio, then specify one of dimensions and put -2 for other:įfmpeg -i INPUT -filter_complex scale=-2:480 -map OUTPUT. Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1a2.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf57.71.100 Duration: 00:00:10.02, start: 0.If you want resize your input video to specific size such as 640x480 regardless of it's size and Aspect Ratio, then:įfmpeg -i INPUT -filter_complex scale=640:480 -map OUTPUT.īut, not preserving Aspect Ratio may result ugly videos. The same problem with approaches other than “-f ~]$ # you can also use "aevalsrc" to generate silence audio stream.
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