[0:v]split=1[c0v];[0:a]asplit=1[c0a];[1: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 [t0v]; aevalsrc=0:d=3 [t0a]; [c0v] trim=start=0:end=12.8,setpts=PTS-STARTPTS,fps=15,settb=AVTB [t1v]; [c0a] atrim=start=0:end=12.8,asetpts=PTS-STARTPTS [t1a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=3[outv];[t0a][t1a]concat=n=2:v=0:a=1[outa];