---
title: LTX-2.5 Text Encoder 4bit 8GB
emoji: 🎬
colorFrom: indigo
colorTo: purple
sdk: gradio
sdk_version: 5.49.1
app_file: app.py
pinned: false
license: other
short_description: t2v, i2v and v2v on an 8.46 GB 4-bit LTX-2.5 encoder
models:
  - topabaem/LTX-2.5-Text-Encoder-4bit-8GB
  - Lightricks/LTX-2.5
---

# LTX-2.5 with a 4-bit text encoder

Text-to-video, image-to-video and video-to-video driven by
[`topabaem/LTX-2.5-Text-Encoder-4bit-8GB`](https://huggingface.co/topabaem/LTX-2.5-Text-Encoder-4bit-8GB)
— the Gemma4-12B text encoder compressed from 26.264 GB to 8.46 GB with no
compute-capability floor, paired with the distilled 22B DiT as `Q3_K_M` GGUF.

Video and audio are generated together; the clips carry their own soundtrack.

## What is actually being demonstrated

This Space exercises the packed encoder in a complete LTX-2.5 pipeline. The
serving stack also includes pinned ComfyUI and LTX VAE revisions, a third-party
`Q3_K_M` DiT, custom audio-video guide handling, adaptive scheduling and an
optional refinement pass. A generated clip is therefore an end-to-end smoke
test, not an isolated proof of encoder quality.

Live prompts use the `gemma4-raw-intermediate-slots-v1` conditioning contract:
an explicit BOS token, a 1024-token left-padded Gemma forward, extraction of the
valid-token suffix, and the raw intermediate hidden-state slots returned by the
model (whose final slot is already final-normalized). The static sample pairs
were generated before this correction. They remain historical comparisons of
two checkpoints under the same older preprocessing, but they do not validate
the corrected live path; a corrected BF16 oracle comparison is not yet
published.

Image- and video-to-video need one thing ComfyUI does not ship: `LTXVAddGuide`
cannot take a combined audio-video latent, because it calls `torch.cat` on a
`NestedTensor`. The model, sampler and mask plumbing all support it already, so
`ltx_av_guide.py` unwraps the pair, runs the stock node on the video half and
re-wraps. The guide maths stays the vendor's.