ffmpeg -y -i inputStream \
       -row-mt 1 -s 1280x720 -b:v 1024k -minrate 512k -maxrate 1485k  
       -tile-columns 2 -g 240 -threads 8 -quality good -crf 32 -c:v libvpx-vp9 -c:a libvorbis hd \
       -row-mt 1 -s 640x480 -b:v 750k -minrate 375k -maxrate 1088k \
       -tile-columns 1 -g 240 -threads 4 -quality good -crf 33 -c:v libvpx-vp9 -c:a libvorbis fsd \
       -row-mt 1 -s 640x480 -b:v 512k -minrate 256k -maxrate 742k \
       -tile-columns 1 -g 240 -threads 4 -quality good -crf 34 -c:v libvpx-vp9 -c:a libvorbis sd

After specifying your input(s), all audio/video/subtitle options are designated for the next output, so you may write different options for differents outputs.