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crossfade example with ffmpeg (audio and video):
/opt/ffmpeg/bin/ffmpeg -i 1.mov -i 2.mov -f lavfi -i color=black -filter_complex \
“[0:v]format=pix_fmts=yuva420p,fade=t=out:st=4:d=1:alpha=1,setpts=PTS-STARTPTS[va0];\
[1:v]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+4/TB[va1];\
[2:v]scale=1920×1080,trim=duration=7[over];\
[0:a]afade=t=out:st=4:d=1[a0];\
[1:a]afade=t=in:st=0:d=1[a1];\
aevalsrc=0:d=4[s1];\
[s1][a1]concat=n=2:v=0:a=1[ac1];\
[a0][ac1]amix[outa];\
[over][va0]overlay[over1];\
[over1][va1]overlay=format=yuv420[outv]” \
-vcodec libx264 -aspect 1.778 -map [outv] -map [outa] -codec:a libmp3lame -qscale:a 2 -ss 00:00:02 -t 5 out.mp4
highest quality:
/opt/ffmpeg/bin/ffmpeg -i 1.mov -i 1.mov -f lavfi -i color=black -filter_complex \
“[0:v]format=pix_fmts=yuva420p,fade=t=out:st=4:d=1:alpha=1,setpts=PTS-STARTPTS[va0];\
[1:v]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1,setpts=PTS-STARTPTS+4/TB[va1];\
[2:v]scale=1920×1080,trim=duration=7[over];\
[0:a]afade=t=out:st=4:d=1[a0];\
[1:a]afade=t=in:st=0:d=1[a1];\
aevalsrc=0:d=4[s1];\
[s1][a1]concat=n=2:v=0:a=1[ac1];\
[a0][ac1]amix[outa];\
[over][va0]overlay[over1];\
[over1][va1]overlay=format=yuv420[outv]” \
-vcodec libx264 -preset ultrafast -qp 0 -aspect 1.778 -map [outv] -map [outa] -acodec libvorbis -qscale:a 10 -ss 00:00:02 -t 5 out.mp4