Or if you want to use your graphics card hardware to do the scaling:
(Video Input) -> (Video Filter: CUDA Upload) -> (Video Filter: CUDA Scale) -> (Video Encoder: NVENC H.264 with input data type set to "CUDA") -> (Muxer) -> (Output)
You can unzip and import this file into Scene Designer: scene2.zip
If i try that my I have the ffmpeg error again