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FFmpeg now has a crossfade filter, released in version 4.3.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "xfade=offset=4.5:duration=1" output.mp4

And similarly, there's an audio version.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "xfade=offset=4.5:duration=1;acrossfade=offset=4.5:duration=1" output.mp4

FFmpeg now has a crossfade filter, released in version 4.3.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "xfade=offset=4.5:duration=1" output.mp4

And similarly, there's an audio version.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "xfade=offset=4.5:duration=1;acrossfade=duration=1" output.mp4

FFmpeg now has a crossfade filter, released in version 4.3

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex xfade=offset=4.5:duration=1 output.mp4

FFmpeg now has a crossfade filter, released in version 4.3.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "xfade=offset=4.5:duration=1" output.mp4

And similarly, there's an audio version.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "xfade=offset=4.5:duration=1;acrossfade=offset=4.5:duration=1" output.mp4

I'm not sure when it was added, but ffmpeg now has a crossfade filter.

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex xfade=offset=4.5:duration=1 output.mp4

FFmpeg now has a crossfade filter, released in version 4.3

ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex xfade=offset=4.5:duration=1 output.mp4