arguments

The arguments of the encoder for quality, a constant quality from 1 to 100 where higher is better, or null for the default bitrate of the encoder. A quality of 60 is comparable to the default constant rate factor of libx264. The arguments include the device of VAAPI encoders, keep Media Foundation from falling back to its software encoder, and let VideoToolbox fall back to its software encoder on Macs without a hardware encoder.