[0:v]split=2[c0v][c1v];[0:a]asplit=2[c0a][c1a];[1:v]split=2[c2v][c3v];[1:a]asplit=2[c2a][c3a];[c0v] trim=start=0:end=18.86,setpts=PTS-STARTPTS,fps=25,settb=AVTB [t0v]; [c0a] atrim=start=0:end=18.36,asetpts=PTS-STARTPTS [t0a]; [c1v] trim=start=149.71000000000004:end=158.84000000000003,setpts=PTS-STARTPTS,fps=25,settb=AVTB [t1v]; [c1a] atrim=start=149.71000000000004:end=158.34000000000003,asetpts=PTS-STARTPTS [t1a]; [c2v] trim=start=0:end=11.29,setpts=PTS-STARTPTS,fps=25,settb=AVTB [t2v]; [c2a] atrim=start=0:end=10.79,asetpts=PTS-STARTPTS [t2a]; [c3v] trim=start=227.59000000000015:end=233.19000000000014,setpts=PTS-STARTPTS,fps=25,settb=AVTB [t3v]; [c3a] atrim=start=227.59000000000015:end=233.19000000000014,asetpts=PTS-STARTPTS [t3a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=18.36[vfade1];[vfade1][t2v]xfade=transition=fade:duration=0.5:offset=26.990000000000002[vfade2];[vfade2][t3v]xfade=transition=fade:duration=0.5:offset=37.78[outv];[t0a][t1a][t2a][t3a]concat=n=4:v=0:a=1[outa];