[0:v]split=1[c0v];[0:a]asplit=1[c0a];[c0v] trim=start=0:end=68.46,setpts=PTS-STARTPTS,setsar=1:1,fps=25,settb=AVTB [t0v]; [c0a] atrim=start=0:end=67.96,asetpts=PTS-STARTPTS [t0a]; [1:v] scale=3840:2160:force_original_aspect_ratio=1,pad=3840:2160:(ow-iw)/2:(oh-ih)/2:color=white,setsar=1:1,fps=25,settb=AVTB [t1v]; aevalsrc=0:d=9.166667 [t1a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=67.96[outv];[t0a][t1a]concat=n=2:v=0:a=1[outa];