feat: add ltx2.3 support

[leejet]

LTX-2.3 dev T2V

.\bin\Release\sd-cli.exe -M vid_gen --diffusion-model  ..\..\ComfyUI\models\diffusion_models\ltx-2.3-22b-dev-UD-Q4_K_M.gguf --vae ..\..\ComfyUI\models\vae\ltx-2.3-22b-dev_video_vae.safetensors --audio-vae ..\..\ComfyUI\models\vae\ltx-2.3-22b-dev_audio_vae.safetensors --llm ..\..\ComfyUI\models\text_encoders\gemma-3-12b-it-qat-UD-Q4_K_XL.gguf --embeddings-connectors ..\..\ComfyUI\models\text_encoders\ltx-2.3-22b-dev_embeddings_connectors.safetensors  -p "a lovely cat" --cfg-scale 6.0 --sampling-method euler -v -n "worst quality, low quality, blurry, distorted, artifacts" -W 1280 -H 720 --diffusion-fa --offload-to-cpu --video-frames 33 --fps 24 -o t2v.webm

t2v.webm

LTX-2.3 dev I2V

.\bin\Release\sd-cli.exe -M vid_gen --diffusion-model  ..\..\ComfyUI\models\diffusion_models\ltx-2.3-22b-dev-UD-Q4_K_M.gguf --vae ..\..\ComfyUI\models\vae\ltx-2.3-22b-dev_video_vae.safetensors --audio-vae ..\..\ComfyUI\models\vae\ltx-2.3-22b-dev_audio_vae.safetensors --llm ..\..\ComfyUI\models\text_encoders\gemma-3-12b-it-qat-UD-Q4_K_XL.gguf --embeddings-connectors ..\..\ComfyUI\models\text_encoders\ltx-2.3-22b-dev_embeddings_connectors.safetensors  -p "a lovely cat" --cfg-scale 6.0 --sampling-method euler -v  -W 1280 -H 720 --diffusion-fa --offload-to-cpu --video-frames 33 -i ..\assets\ernie_image\turbo_example.png -o i2v.webm

i2v.webm

[Green-Sky]

Finally, temporal tiling 🥳

[Green-Sky]

Looks like @stduhpf 's https://huggingface.co/stduhpf/google-gemma-3-12b-it-qat-q4_0-gguf-small would be ideal here.

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@leejet your example command contains both --diffusion-fa and --fa (:

[juntaosun]

Does it support LoRa loading?

[stduhpf]

Does it support LoRa loading?

Of course it does.

[stduhpf]

Audio decoding is messed up (seems to be sped up with high pitch and repeats twice). Other than that it works nicely so far. Great job as always @leejet !

edit: I believe the audio issue might just be because of the arrangement of stereo samples in the webm file (planar vs interleaved)

[LostRuins]

Very nice to see this is being worked on, LTX 2.3 is highly anticipated!

Tangentially, not sure if you've seen this (likely vibecoded) ltx.cpp implementation https://github.com/audiohacking/ltx.cpp which is also ggml based, probably not too helpful but might be a useful reference, seeing as they also use the same comfyui ggufs.

[leejet]

Very nice to see this is being worked on, LTX 2.3 is highly anticipated!

Tangentially, not sure if you've seen this (likely vibecoded) ltx.cpp implementation https://github.com/audiohacking/ltx.cpp which is also ggml based, probably not too helpful but might be a useful reference, seeing as they also use the same comfyui ggufs.

I hadn’t looked at this project before, but it seems that this is not a complete implementation. The documentation says that ltx2.3 uses T5-XXL, which I don’t quite understand.