T2V example produces empty black video on mac m4pro

[Fraer]

Hello,

I get a completely empty black video when running the T2V example on my macbook pro M4 pro 48Gb ram.

MacOS version: 15.4.1 (24E263)

System Info (from ComfyUI) OS: posix Python Version: 3.10.16 (main, Mar 23 2025, 12:38:27) [Clang 16.0.0 (clang-1600.0.26.6)] Embedded Python: false Pytorch Version: 2.8.0.dev20250420 Arguments: main.py RAM Total: 48 GB RAM Free: 23.28 GB

Devices Name: mps Type: mps VRAM Total: 48 GB VRAM Free: 23.28 GB Torch VRAM Total: 48 GB Torch VRAM Free: 23.28 GB

ComfyUI-LTXVideo version:

commit ddb96675f0f6d674a046f8b847caea9fca33b8ca (HEAD -> master, origin/master, origin/HEAD)
Merge: e2a7351 bdde649
Author: Michael Kupchick <[email protected]>
Date:   Thu Apr 17 18:20:56 2025 +0300

    Merge pull request #153 from Lightricks/pr-2025-04-17
    
    Update ComfyUI-LTXVideo - 2025-04-17

Models (required by T2V example) LTXV Model: ltxv-2b-0.9.6-dev-04-25 Text encoder: t5xxl_fp16.safetensors

Not sure to understand what i'm doing wrong, is there a special config for mac users?

[Sidclove]

I'm facing the same issue. Does this workflow work on Mac is the question?"

[Sidclove]

But the image to video workflow is working with distilled model somewhat. Have you tried that @Fraer ?

[Fraer]

yep i2v is working, lcm ksampler gives best results

[elistys]

Today I tried t2i and i2i for the first time using the Example workflows on the top page on my Mac mini M4, and both produced completely black videos (only 22KB to 26KB) just like yours.

[elistys]

@Sidclove @Fraer Can you share a workflow (json) that works fine i2v on a Mac?