the timeline it's 4k such as the render settings, and if i rendere the same clip in another project the quality it's good, but in this project appears to be of inferior quality. Can you tell me why? thank you.
I didn't look at the samples, but if you want best h.264/5 render quality, render out an intermediate format from Resolve (Prores or DNxHR, for example), and compress it to h.264/5 in something like Handbrake or Shutter Encoder.