LtxAdd - V2V ADD AUDIO AND EXTEND ANY VIDEO (ltx2.3)

Use this workflow to take an existing video, add audio, and extend it by 10 or 20 seconds. Its output is an extended video with added audio.

The workflow entry is named LtxAdd.json and contains 141 nodes, including video loading, audio-video processing, video combining, and spatial upscaling.

Input: an existing video.

Output: a video extended by 10 or 20 seconds with added audio.

The listed release is v1.0 from WanApp and uses LTXV 2.3 as its base model.

No license is specified for this workflow; check the publisher’s terms before use.

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It requires these node packs: ComfyUI-Easy-Use, ComfyUI-KJNodes, ComfyUI-LTXVideo, and ComfyUI-VideoHelperSuite.

It lists these model files: gemma_3_12B_it_fp4_mixed.safetensors, ltx-2.3-22b-dev-fp8.safetensors, ltx-2.3-22b-distilled-lora-384.safetensors, ltx-2.3-spatial-upscaler-x2-1.1.safetensors, and LtxApp_LoRA.safetensors.

Choose a 10- or 20-second extension.

Turn Enhanced Prompt on or off.

Turn on Custom LoRA to add a custom LoRA.

Before use, check that your installation provides all five listed model files.

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Before enabling Custom LoRA, verify that ltx-2.3-22b-distilled-lora-384.safetensors and LtxApp_LoRA.safetensors are installed.

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