Hi all, i had the same problem, when i want to render my sequence it starts ok but suddenly it seems like the scalability switches to low quality, no matter what i do always happens even if i set console commands for quality settings in BP it still lowers the quality, i dont know if you already have the solution, but i just figured out, and this is what i did…
Inside Render Movie Settings dialog, under General expand advanced parameters, there is an option called Use Separate Process and check it.
Now when you Capture the movie it will do in a separate process and not in the actual one in editor that its seems is very loaded so it cant handled everything… well im a noob so maybe someone else can explain better… the truth is that i dont have the low quality problem anymore…
Hope this help