Video Upscaling & Restoration

Overview

"Upscaling video" in ComfyUI splits into three jobs, and the quality win comes from doing them in the right order:

1. Spatial restore + upscale. A temporal-aware model that increases resolution AND cleans compression blocks, blur, and AI-gen mush while keeping frames consistent over time. This is the part a plain image upscaler (ESRGAN, UltimateSDUpscale per-frame) does badly. Per-frame upscalers flicker because each frame is sharpened independently. Use a video model.
2. Frame interpolation (VFI). Synthesize in-between frames to raise fps (e.g. 24→48/60) for smooth motion. Do this after the spatial pass.
3. Encode. Mux frames (plus original audio) back to an MP4.