-y -accurate_seek
-ss "00:00:00.000" -to "00:00:10.009" -i "F:\test\test.webm"
-ss "00:00:20.019" -to "00:00:30.029" -i "F:\test\test.webm"
-filter_complex "[0:v:0]yadif=deint=interlaced,format=yuv420p,setsar=sar=1,fps=fps=23.976024[n_i0_s0_v];[0:a:0]anull[n_i0_s0_a0];[1:v:0]yadif=deint=interlaced,format=yuv420p,setsar=sar=1,fps=fps=23.976024[n_i0_s1_v];[1:a:0]anull[n_i0_s1_a0];[n_i0_s0_v][n_i0_s0_a0][n_i0_s1_v][n_i0_s1_a0]concat=n=2:v=1:a=1[concat_v][concat_a0]"
-map "[concat_v]" -c:v libx264 -preset medium -crf 23
-map "[concat_a0]" -c:a libopus -b:a:0 128k
-dn -map_metadata -1 -map_chapters -1 -f mp4