One-Step Video Upscaling with SeedVR2 Guide 🎥

🎬 Transform low-resolution videos to 4K and beyond in a single step with SeedVR2, ByteDance's groundbreaking video restoration model now available under Apache 2.0 license. In this comprehensive tutorial, we break down the architecture, show you how to run it on consumer hardware with limited VRAM, and demonstrate production-ready workflows including alpha channel support with image sequences and multi GPU renders.

Learn how Diffusion Adversarial Post-Training achieves what previously took 15-50 steps in just one, making high-quality video upscaling finally practical for production pipelines.

🔥 What you'll learn:
- Set up SeedVR2 in ComfyUI with NumZ's integration
- Run 7B parameter models on 16GB VRAM using BlockSwap
- Choose between 3B/7B models and FP8/FP16 precision
- Upscale image sequences with alpha channel preservation
- Optimize batch sizes for temporal consistency
- Multi-GPU command line processing for large projects
- Control detail enhancement levels through resolution stepping

📊 Timestamps:
0:00 Introduction - Why SeedVR2 upscaler changes everything
3:07 ComfyUI Setup & Installation
3:51 Basic Image Upscaling Workflow
6:18 Parameters deep dive: Choose the right model (3B vs 7B), batch_size, preserve_vram...
10:13 Video upscaling workflow
11:35 BlockSwap: What are blocks and how to run SeedVR2 on consumer hardware
19:05 Resolution control techniques, avoiding over sharpening
21:31 Super resolution upscaling with images
23:46 Architecture under the hood: Swin transformer
25:15 Image sequences upscaling with Alpha channel workflow
31:17 Performance & Limitations
32:10 Multi-GPU Processing

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*🔗 Workflow & Resources:*
- Complete ComfyUI workflows: https://github.com/AInVFX/AInVFX-News/tree/main/episodes/20250711
- Read the full article: https://www.ainvfx.com/blog/speed-up-video-generation-2-3x-magcache-nag-dloral-and-ai-art-restoration/

**SeedVR2 Research:**
- Project Page: https://iceclear.github.io/projects/seedvr2/
- SeedVR Paper: https://arxiv.org/abs/2501.01320
- SeedVR2 Paper: https://arxiv.org/abs/2506.05301
- Official GitHub: https://github.com/ByteDance-Seed/SeedVR

**ComfyUI Implementations:**
- ComfyUI-SeedVR2_VideoUpscaler by NumZ: https://github.com/numz/ComfyUI-SeedVR2_VideoUpscaler
- ComfyUI-CoCoTools_IO by Conor-Collins: https://github.com/Conor-Collins/ComfyUI-CoCoTools_IO
- ComfyUI-VideoHelperSuite by Kosinkadink: https://github.com/Kosinkadink/ComfyUI-VideoHelperSuite

**Additional References:**
- What is GAN?: https://aws.amazon.com/what-is/gan/
- Attention Is All You Need: https://arxiv.org/pdf/1706.03762

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*💡Why this episode matters*
Video upscaling has been stuck in a painful trade-off: fast methods flicker, quality methods are slow, and both typically require expensive hardware or licenses. SeedVR2 breaks this cycle entirely. One-step restoration isn't just a technical achievement—it fundamentally changes what's possible in post-production workflows.

For independent creators and small studios, this means professional-quality upscaling without render farms. For larger productions, it means preview quality becomes final quality. And with BlockSwap, even laptop users can access 16B parameter models. This isn't incremental progress; it's a paradigm shift in how we think about resolution enhancement.

The Apache 2.0 license ensures this technology remains accessible to everyone. Combined with NumZ's excellent ComfyUI integration, we finally have AI upscaling that's production-ready, temporally stable, and practically usable.

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*💫 Who is AInVFX*
Led by Adrien, former Head of Effects at Wētā FX with credits on Avatar, Game of Thrones, and The Hobbit, AInVFX cuts through the hype to deliver what actually matters: practical insights, ethical implementations, and real-world applications that empower artists and studios with AI tools.

We bridge the gap between cutting-edge research papers and production-ready tools, helping VFX and Animation professionals navigate this transformative era. Because the future of VFX isn't just about technology - it's about keeping humanity and creativity at the heart of everything we do.