-i "C:\Users\ABC\Desktop\Videos\x1.mp4" -filter_complex "[0:v]null[out2];[0:a]atrim=duration=10[a];[0:a]atrim=start=10:duration=10,volume=0[b];[a][b]concat=v=0:a=1[c];[0:a]atrim=start=20[d];[c][d]concat=v=0:a=1[out1]" -acodec mp2 -map [out1] -map [out2] "C:\Users\ABC\Desktop\Videos\x2.mp4"