I have been using the Debug Mode Frame Saver plug-in to render my clips using AviScript in Sony Vegas/Vegas PRO for 14 years. Despite so many years of development of various codecs, I have not found a better way to render a movie at the best quality. None of the technologies (e.g. NVIDIA GPU or Intel QSN) can match Frame Saver rendering. I'm just a humble amateur who makes films for myself and my family, but I'm hugely grateful that Frame Saver was developed.
I have purchased the latest version of VEGAS PRO 22 and am looking forward to the Frame Server version that supports it . Rendering video with the default VEGAS PRO codecs I see poorer quality than I achieved in the older version of Sony Vegas with Frame Sever (clips in HD and 4K).
If I can help your business financially with quality - you have my support. Just let me know how to do it (I missed the transition to CuminCode and I don't quite know what the current status of your project and license is ....).
Best regards!
Damian