av1

When I use VS as source, it gives me this error code:

!! Could not input video. Is it a y4m file?

my script is:

vspipe --y4m RAW.vpy - | C:\Encoder\rav1e.exe --quantizer 60 --speed 1 --frame-rate 24000 --time-scale 1001 - -o RAW.ivf

The Whole UI needs test, but I think most important is to make sure with whatever input is supplied to the command builders fastflix/encoders/<name>/command_builder.py and the general functions in fastflix/encoders/common/helpers.py is the most important to get tests for first.

I have some minimal start on pytests, but would appreciate any help in this effort.