-i "C:\\vid\\01 - Orphan Bird.mp3" -c:v:0.1 libvpx-vp9 -pass 1 -b:v 100K -threads 8 -speed 4 -tile-columns 8 -frame-parallel 1 -vf scale=-1:200 -an -f webm C:\\vid\\temp\\null
-i "C:\\vid\\01 - Orphan Bird.mp3" -c:v:0.1 libvpx-vp9 -pass 2 -b:v 100K -threads 8 -speed 1 -tile-columns 8 -frame-parallel 1 -auto-alt-ref 1 -lag-in-frames 25 -vf scale=-1:200 -c:a:0.0 libopus -b:a 64k -f webm C:\\vid\\orphan.webm

Lavc57.1.100 libvpx-vp9
Stream mapping:
  Stream #0:1 -> #0:0 (png (native) -> vp9 (libvpx-vp9))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height