[0:v]split=2[c0v][c2v];[0:a]asplit=2[c0a][c2a];[1:a]asplit=2[cm1a][cm3a];[c0v] trim=start=0:end=3.38,setpts=PTS-STARTPTS,fps=15,settb=AVTB [t0v]; [c0a] atrim=start=0:end=2.88,asetpts=PTS-STARTPTS [t0a]; [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 [t1v]; [cm1a] atrim=start=2.8799999999999955:end=5.8799999999999955,asetpts=PTS-STARTPTS [t1a]; [c2v] trim=start=5.8799999999999955:end=9.379999999999995,setpts=PTS-STARTPTS,fps=15,settb=AVTB [t2v]; [c2a] atrim=start=5.8799999999999955:end=8.879999999999995,asetpts=PTS-STARTPTS [t2a]; [3:v] trim=start=0:end=4,setpts=PTS-STARTPTS,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]; [cm3a] atrim=start=8.879999999999995:end=12.879999999999995,asetpts=PTS-STARTPTS [t3a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=2.88[vfade1];[vfade1][t2v]xfade=transition=fade:duration=0.5:offset=5.88[vfade2];[vfade2][t3v]xfade=transition=fade:duration=0.5:offset=8.879999999999999[outv];[t0a][t1a][t2a][t3a]concat=n=4:v=0:a=1[outa];