[0:v]split=4[c0v][c1v][c2v][c3v];[0:a]asplit=4[c0a][c1a][c2a][c3a];[c0v] trim=start=0:end=0.399,setpts=PTS-STARTPTS,fps=25,settb=AVTB [t0v]; [c0a] atrim=start=0:end=0.399,asetpts=PTS-STARTPTS [t0a]; [c1v] trim=start=0.8399999999999181:end=20.809999999999917,setpts=PTS-STARTPTS,fps=25,settb=AVTB [t1v]; [c1a] atrim=start=0.8399999999999181:end=20.809999999999917,asetpts=PTS-STARTPTS [t1a]; [c2v] trim=start=21.180000000000064:end=61.26000000000006,setpts=PTS-STARTPTS,fps=25,settb=AVTB [t2v]; [c2a] atrim=start=21.180000000000064:end=60.76000000000006,asetpts=PTS-STARTPTS [t2a]; [c3v] trim=start=650.05:end=651.17,setpts=PTS-STARTPTS,fps=25,settb=AVTB [t3v]; [c3a] atrim=start=650.05:end=651.17,asetpts=PTS-STARTPTS [t3a]; [t0v][t1v]concat=n=2:v=1:a=0[vfade1]; [vfade1][t2v]concat=n=2:v=1:a=0[vfade2]; [vfade2][t3v]xfade=transition=fade:duration=0.5:offset=59.949[outv];[t0a][t1a][t2a][t3a]concat=n=4:v=0:a=1[outa];