Normally, color space "Unspecified" should be okay for rec709/limited. You can still use the "setparams" filter to apply that color space manually. But from my experience there shouldn't be a difference.
Hello I have a question! Now I am trying your encoder with Magix Vegas Pro 17 but I record my gameplay with Obs 709 and limited. So when I render the video for YouTube I use only the default filter colorspace for output (no input) for metadata? I can render with default Magix render but I can't read colorspace using mediainfo, but with your encoder + filter yes and so maybe for youtube is better with metadata colorspace 709 and limited. Sorry for my english but I hope you can read.