[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[i_video];color=c=black:s=1920x1080:r=25:d=0.5[i_black];[i_video][i_black]concat=n=2:v=1:a=0,settb=AVTB [t0v]; [0:a]asetpts=PTS-STARTPTS[t0a]; [1:v]split=1[c0v];[1:a]asplit=1[c0a];[c0v] trim=start=0:end=69.93,setpts=PTS-STARTPTS,setsar=1:1,fps=25,settb=AVTB [t1v]; [c0a] atrim=start=0:end=69.43,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=2 [t2a]; [t0v][t1v]xfade=transition=fade:duration=0.5:offset=4.066667[vfade1];[vfade1][t2v]xfade=transition=fade:duration=0.5:offset=73.496667[outv];[3:a]atrim=start=0:end=76.496667,asetpts=PTS-STARTPTS[bgAudio];[bgAudio]loudnorm=I=-25.7[sba],[t1a][sba]amix=duration=shortest:normalize=0[outaa0];[t0a][outaa0][t2a]concat=n=3:v=0:a=1[outaa];