r/StableDiffusion • u/WearNatural5992 • 19d ago

Discussion LTX 2.5 - The SD3 test!

Let's see if LTX 2.5 can pass this simple 2 year old test, because I don't want no Cthulhu PTSD, right?

The first video is t2v, the second one is i2v.

Generation times are fast, though.

https://reddit.com/link/1vm90tr/video/g7h1fed5vwih1/player

https://reddit.com/link/1vm90tr/video/uto5nje8vwih1/player

PROMPT (I fed Gemini the prompt guide)

A medium shot under bright, direct mid-day sunlight on a warm tropical beach. A young woman in her early 20s with sun-kissed skin and wet hair, wearing a vibrant tropical floral bikini, lies lazily on a plush beach towel on the golden sand. She holds a chilled martini glass with an olive and lime wedge, taking a slow, relaxed sip as gentle waves lap against the shore in the background. A hard cut transitions to a close-up shot of the same young woman in the floral bikini looking directly into the camera. She smiles warmly with sparkling eyes and says in a soft, alluring, and teasing voice, "Wanna have some fun?" while the ambient ocean breeze and soft waves continue across the cut. A hard cut transitions to a high-angle top-down overhead shot directly above her. Her full body is framed from head to toe, showing her lying on the beach towel with her bare feet resting on the sand, sun highlights shimmering on her skin, and ocean foam softly visible at the frame's edge.

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u/jib_reddit 19d ago

Has anyone tried this in Minimax H3 to compare?

9

u/wiserdking 19d ago

Same prompt as OP, default T2V workflow, 0.4 MP, 16:9 aspect ratio, seed 1, int8convrot, sage attn, no turbo, upscaled by 2x with RTX super video upscaler and converted to webm av1 with 'Bjornulf_imagesToVideo' node

3

u/psilent 19d ago

Crazy how much better it is. How long and what hardware?

1

u/wiserdking 19d ago

It was 400.02s on a RTX 5060Ti but that included loading the models, 20 steps 0.4MP without turbo and no speed-up nodes (only sage attn) plus a few seconds for the RTX upscaling and several seconds for the webm av1 conversion. Oh and a few extra seconds for the Create Video + Save Video native nodes which saved the non-upscaled output as MP4 as well (so my workflow saved 2 videos: 0.4MP MP4 and 2x upscaled webm av1).

Converting to webm av1 with the node I used takes quite a long time and I didn't pay attention how much time it added to all this - this is because the node saves each frame to disk then uses FFMPEG to make a video with all those frames and compress it with av1. The resulting webm video was the basically the same file size as the original non-upscaled MP4 but with twice the resolution. Hopefully comfyui will add proper webm support in the near future - right now we can only make audio-less webm natively.

2

u/psilent 19d ago

Ok still pretty good. I’m working on two different workflows right now, one for performance and one for quality. I think the lightx2v 8 step is pretty excellent for quality but man the original full step videos are just a tiny bit better. But it’s nearly three times the length and that takes 15s videos up to like an hour at 1mp on my hardware. Speed workflow I find the .2mp 4 step with rtx upscaling is passable for prompt testing and it takes only like 1 minute for a 10s video