[0:v] scale=1280:720:force_original_aspect_ratio=1,pad=1280:720:(ow-iw)/2:(oh-ih)/2:color=white,setsar=1:1,fps=15[i_video];color=c=black:s=1280x720:r=15:d=0.5[i_black];[i_video][i_black]concat=n=2:v=1:a=0,settb=AVTB [t0v]; aevalsrc=0|0:d=4.766667 [t0a]; [1:v]split=2[c0v][c1v];[1:a]asplit=2[c0a][c1a];[c0v] trim=start=0:end=56.32,setpts=PTS-STARTPTS,setsar=1:1,fps=15,settb=AVTB [t1v]; [c0a] atrim=start=0:end=56.32,asetpts=PTS-STARTPTS [t1a]; [c1v] trim=start=58.07999999999993:end=64.41999999999993,setpts=PTS-STARTPTS,setsar=1:1,fps=15,settb=AVTB [t2v]; [c1a] atrim=start=58.07999999999993:end=63.91999999999993,asetpts=PTS-STARTPTS [t2a]; [2:v] scale=1280:720:force_original_aspect_ratio=1,pad=1280:720:(ow-iw)/2:(oh-ih)/2:color=white,setsar=1:1,fps=15,settb=AVTB [t3v]; aevalsrc=0:d=4.766667 [t3a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=4.766667[vfade1];[vfade1][t2v]concat=n=2:v=1:a=0[vfade2]; [vfade2][t3v]xfade=transition=fade:duration=0.5:offset=66.926667[outv];[t0a][t1a][t2a][t3a]concat=n=4:v=0:a=1[outa];