tutorials/video/ltx/ltx-2-5

[giscus[bot]]

tutorials/video/ltx/ltx-2-5

Use LTX-2.5 in ComfyUI with native text-to-video, image-to-video, and first-last-frame workflows, including synchronized audio and native multishot scenes.

https://docs.comfy.org/tutorials/video/ltx/ltx-2-5

[frpfrp53-byte]

After updating to version 34, none of the LTX2.5 workflows work anymore—even with a clean installation on ComfyUI. The processes halt with error messages related to audio nodes. It is best not to update.

[lin-bot23]

Hi @frpfrp53-byte, thanks for the report. LTX-2.5 audio failures right after an update are usually either a missing model file or a custom node pack shadowing the core audio nodes, so a couple of details will let us pinpoint it:

1. The full error text, or a screenshot, from the ComfyUI console, and in particular which node it names. The LTX-2.5 templates use the core audio nodes LTXVAudioVAELoader, LTXVAudioVAEDecode, and LTXVEmptyLatentAudio.
2. What "version 34" refers to (ComfyUI core such as v0.34.x, the Desktop build, or the frontend) and which version you are on now, shown in the ComfyUI menu, or python main.py --version when running from source.
3. How ComfyUI is installed (Desktop, Windows portable, or manual), and whether the clean install also re-downloaded the models.

A few things worth checking in the meantime:

• All three LTX-2.5 workflows need the dedicated audio VAE ltx-2.5-audio-vae-bf16.safetensors in ComfyUI/models/vae/, alongside ltx-2.5-video-vae-bf16.safetensors. If the audio VAE is missing or sits in the wrong folder, the workflow fails at audio decode. The full file list is on the page: https://docs.comfy.org/tutorials/video/ltx/ltx-2-5
• The weights live in the gated Lightricks/LTX-2.5 repository on Hugging Face. After a clean reinstall, downloads fail unless the access request for that repo was approved for the account you are logged in with.
• Custom node packs can shadow the core LTX audio nodes. There are recent reports of comfyui-kjnodes breaking LTX audio: https://huggingface.co/Kijai/LTXV2_comfy/discussions/51 . If you have custom nodes installed, try starting ComfyUI with --disable-all-custom-nodes to confirm, then update or roll back the pack.
• The first step on the page is updating ComfyUI to the latest version, since these workflows and their audio nodes ship with ComfyUI itself: https://docs.comfy.org/installation/update_comfyui

If you can paste the traceback we can tell you exactly which of these it is.