Video Upscale & Restoration
The basic idea and methods are almost the same as in Upscale & Restoration.
- 1. Increase resolution
- 2. Plausibly fill in lost detail and clean up the image quality
There is one big difference, though: with video, continuity over time (no flicker) matters.
Applying a still-image upscaler "one frame at a time" does technically upscale a video, but it has no temporal consistency, so you may get flicker.
So you're better off using an upscaler made for video.
Here are just two of the current state-of-the-art options.
You can't use still-image upscalers for video, but the reverse works just fine. In fact, video upscalers often perform better than dedicated still-image ones, and they're widely used that way.
SeedVR2
numz/ComfyUI-SeedVR2_VideoUpscaler
Built specifically for video upscaling, it generates in a single step.
It's powerful enough to use for proper restoration, but it's very heavy.
FlashVSR
lihaoyun6/ComfyUI-FlashVSR_Ultra_Fast
It processes several frames at once to keep temporal jitter and flicker down.
It's designed for near-real-time processing speeds, and since it's fast and lightweight, it's a good one to try first.