createWebm Error

[DessertArbiter]

i have ffmpeg.exe in the same folder as PixivUtil2.exe but i get a weird error

Failed to load ffmpeg, createWebm disabled: argument should be integer or bytes-like object, not 'str'
Command used: ffmpeg -encoders.
Please download ffmpeg with libvpx-vp9 encoder enabled.

this is what my config for ffmpeg in config.ini looks like:

[FFmpeg]
ffmpeg = ffmpeg
ffmpegcodec = libvpx-vp9
ffmpegparam = -lossless 1 -vsync 2 -r 999 -pix_fmt yuv420p
webpcodec = libwebp
webpparam = -lossless 0 -q:v 90 -loop 0 -vsync 2 -r 999

[MinichB]

I ran into this problem myself
The problem is in v20191214
v20191118 does not have such a problem

[Nandaka]

updated the subprocess calling, looks like it slightly changed from py2 to py3