I have monitor resolution 1680x1050, what's the best recording and rendering resolution in sony vegas pro for gameplay on youtube for high quality for my monitor. Thanks.
The best resolution is your native source resolution.
Hardware Upscaling by your teevee is FAR BETTER than any software scaling method.
Musicvid thanks, is this mean that i need to record gameplay and rendering on native 1680x1050, but youtube will show only 720p option.
I missed your mention of YouTube - - yes, you will want to use one of their standard formats; i. e., 1920x1080. That's not too much of a stretch, but personally I would keep it at 1680x1050 and render with black borders on a 1920x1080 project screen. Tick "Preserve Aspect."