[0:a]anull[asrc];[0:v]trim=start=0.000:end=12.000,setpts=PTS-STARTPTS[v_seg0];[asrc]atrim=start=0.000:end=12.000,asetpts=PTS-STARTPTS[a_seg0];[v_seg0][a_seg0]concat=n=1:v=1:a=1[vc][ac];[vc]format=yuv420p[vout];[ac]asplit=2[aduckm][dref0];[1:a]atrim=start=0.000:end=12.000,asetpts=PTS-STARTPTS,afade=t=in:st=0:d=0.20,afade=t=out:st=11.50:d=0.50,volume=0.0dB,aresample=48000[mus0];[mus0][dref0]sidechaincompress=threshold=0.03:ratio=12:attack=180:release=550[musc0];[aduckm][musc0]amix=inputs=2:duration=first:normalize=0[aout]