[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=24[i_video];color=c=black:s=1280x720:r=24:d=0.5[i_black];[i_video][i_black]concat=n=2:v=1:a=0,settb=AVTB [t0v]; [0:a]asetpts=PTS-STARTPTS[t0a]; [1:v]split=1[c0v];[1:a]asplit=1[c0a];[c0v] trim=start=0:end=14.38,setpts=PTS-STARTPTS,setsar=1:1,fps=24,settb=AVTB [t1v]; [c0a] atrim=start=0:end=13.88,asetpts=PTS-STARTPTS [t1a]; [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=24,settb=AVTB [t2v]; [2:a] asetpts=PTS-STARTPTS [t2a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=8.006672[vfade1];[vfade1][t2v]xfade=transition=fade:duration=0.5:offset=21.886672[outv];[t0a][t1a][t2a]concat=n=3:v=0:a=1[outa];