# LTX 2.5 INT8 Generative Video Upscaler — Clean ComfyUI Workflow

A compact, independently assembled ComfyUI workflow for generatively upscaling an existing video with Lightricks' official LTX 2.5 Pixel Spatial Upscaler IC-LoRA and the INT8 ConvRot transformer.

## Highlights

- Video input only — no separate image input

- No prompt or text encoder at runtime

- Preserves the source audio

- Automatic source size, FPS, frame-count, and audio analysis

- 1.5x / 2.0x / 2.5x / 3.0x scale dropdown

- Automatic output sizing to multiples of 64

- INT8 ConvRot transformer

- Official Pixel Spatial Upscaler x2 IC-LoRA

- 8 distilled steps, CFG 1, Euler ancestral

- SageAttention and tiled decode for practical VRAM use

- Clean grouped UI with the implementation hidden in subgraphs

2.0x is the adapter's trained target. The other scale options are experimental canvas sizes using the same x2 adapter; larger values may invent detail and need more VRAM/time.

## Required downloads

Models are not included. Install the official LTX 2.5 INT8 transformer, Conv video VAE, audio VAE, and Pixel Spatial Upscaler IC-LoRA from:

- https://huggingface.co/Lightricks/LTX-2.5

- https://huggingface.co/Lightricks/LTX-2.5-22b-IC-LoRA-Pixel-Spatial-Upscaler

Custom-node dependencies:

- https://github.com/Lightricks/ComfyUI-LTXVideo

- https://github.com/kijai/ComfyUI-KJNodes

Copy the supplied ltx25_int8_upscale_core folder into ComfyUI/custom_nodes, restart, then open the JSON.

## Notes

- A source frame count of 8n+1 is recommended.

- Use a source with an audio track if you want audio preserved.

- No LTX text encoder is required at runtime; the package includes a fresh empty-prompt conditioning cache generated from the official LTX 2.5 INT8 encoder.

- The release was checked for graph loading and node availability on RTX 5080 16 GB. The newly assembled graph was not rendered during packaging.

## License

LTX 2.5 and the Pixel Spatial Upscaler are by Lightricks. This download includes the complete LTX-2.x Community License and a notice describing the modifications. Review the license before use or redistribution.