[0:v] scale=1920:1080:force_original_aspect_ratio=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:color=white,setsar=1:1,fps=25,settb=AVTB [t0v]; aevalsrc=0|0:d=3 [t0a]; [1:v]split=1[c0v];[1:a]asplit=1[c0a];[c0v] trim=start=0:end=43.9,setpts=PTS-STARTPTS,setsar=1:1,fps=25,settb=AVTB [t1v]; [c0a] atrim=start=0:end=43.4,asetpts=PTS-STARTPTS [t1a]; [2:v] scale=1920:1080:force_original_aspect_ratio=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:color=white,setsar=1:1,fps=25,settb=AVTB [t2v]; aevalsrc=0:d=3 [t2a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=3[vfade1];[vfade1][t2v]xfade=transition=fade:duration=0.5:offset=46.4[outv];[t0a][t1a][t2a]concat=n=3:v=0:a=1[outa];