[0:v] scale=1920:1080:force_original_aspect_ratio=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:color=white,setsar=1:1,fps=30[i_video];color=c=black:s=1920x1080:r=30:d=0.5[i_black];[i_video][i_black]concat=n=2:v=1:a=0,settb=AVTB [t0v]; aevalsrc=0|0:d=2 [t0a]; [1:v]split=3[c0v][c1v][c2v];[1:a]asplit=3[c0a][c1a][c2a];[c0v] trim=start=0:end=1.88,setpts=PTS-STARTPTS,setsar=1:1,fps=30,settb=AVTB [t1v]; [c0a] atrim=start=0:end=1.88,asetpts=PTS-STARTPTS [t1a]; [c1v] trim=start=2.5400000000000063:end=4.580000000000006,setpts=PTS-STARTPTS,setsar=1:1,fps=30,settb=AVTB [t2v]; [c1a] atrim=start=2.5400000000000063:end=4.580000000000006,asetpts=PTS-STARTPTS [t2a]; [c2v] trim=start=4.800000000000011:end=11.280000000000012,setpts=PTS-STARTPTS,setsar=1:1,fps=30,settb=AVTB [t3v]; [c2a] atrim=start=4.800000000000011:end=10.780000000000012,asetpts=PTS-STARTPTS [t3a]; [2:v] scale=1920:1080:force_original_aspect_ratio=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:color=white,setsar=1:1,fps=30,settb=AVTB [t4v]; aevalsrc=0:d=2 [t4a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=2[vfade1];[vfade1][t2v]concat=n=2:v=1:a=0[vfade2]; [vfade2][t3v]concat=n=2:v=1:a=0[vfade3]; [vfade3][t4v]xfade=transition=fade:duration=0.5:offset=11.9[outv];[t0a][t1a][t2a][t3a][t4a]concat=n=5:v=0:a=1[outa];