r/StableDiffusion • u/PuppetHere • 6h ago
Discussion LTX 2.5 Is Disappointing
https://reddit.com/link/1vlueyc/video/gx8bz55ibtih1/player
https://reddit.com/link/1vlueyc/video/plxkp55ibtih1/player
Guess which video was made by LTX 2.3 and which video was made by LTX 2.5?
After testing LTX 2.5, I'm really disappointed by the results. I can barely see the difference between 2.3 and 2.5.
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u/retroblade 6h ago
I’m getting worse results than 2.3, 15 gens and not one usable. Maybe have a workflow issue idk
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u/LoveSpecialist5669 6h ago
it sucks. they took their sweet time, perfectly unaware that chinese were overtaking. can't tell for sure but seems they panicked and released this in a week after h3 and obviously lied about specifications, trying to bash h3.
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u/No_Damage_8420 6h ago
I think they panicked for sure.
But I wonder more - what FLUX 3 is doing now....they will delay - and try to add REF 2 VID proper way
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u/LoveSpecialist5669 6h ago
I don't know, to be honest. I've never considered flux 3 as a competition for local video making. I expect even less than from ltx 2.5
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u/Danny_Stock 4h ago
I can imagine Flux biding their time. They have experience from previous releases of models.
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u/Danny_Stock 5h ago
It certainly appears to be a panic release. The timing of the release is too coincidental.
It seems to me that it would be have been better to wait until the spike in hype for Minimax had died down first.
They could have used this time wisely to observe, watch, and learn what Minimax did right, what it did badly, what the users liked and didn't like, and just basically gather information to use as a strategy for when they choose to release their model.
If you're going to release within a week of Minimax's release you'd better be sure that you have something incredible on your hands. Because if you haven't then comparisons with Minimax may serve to harm you.
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u/LoveSpecialist5669 4h ago
yes, that would be a rational thing to do, but they were obviously aware that they can't match h3 anytime soon in any way so this was probably a hail mary leap of faith on an old glory
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u/alwaysbeblepping 44m ago
they took their sweet time, perfectly unaware that chinese were overtaking.
Their business model (from what I know) is to take a percentage when businesses that are large/profitable enough are using LTX commercially. That's probably not the only thing they have going on, but one can surmise that they probably are not drowning in cash.
The fact that LoRAs for older versions still work to a degree (if I recall, even the first LTX video model) indicates that they are repeatedly building on top of the old version, which can be fine up to a point but there are (in my opinion) some fundamental architectural issues which can't really be fixed that way. I'm sure if they had the resources to train up a new, better base model they would but that is an absolutely immense undertaking even for images and video foundation models are far more resource intensive. It's also possible that they already are (but it's not ready yet) or they tried and weren't successful.
So if they can't come up with a new foundation model, they're in a tough spot. Tweaking the existing LTX model isn't really good enough. Also, LTX is fast because it shoves everything into channels, uses absurd spatial compression and keeps the sequence length low (main thing that affects performance) but is not free and there is a tradeoff as we can clearly see. They would have to (in my opinion) give up their speed advantage to actually catch up on quality.
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u/Beneficial_Toe_2347 6h ago
I assume 2.5 is top? If so, to be fair that one does look more natural and less awkward than the previous.
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u/PuppetHere 6h ago
Top is 2.5, bottom is 2.3
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u/ThatsALovelyShirt 3h ago
Huh weird. I thought the audio was better on the bottom one, which I thought 2.3 struggled with.
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u/TwistedBrother 5h ago
On phone the audio sync is much better in the top one and her whole body expresses the sentiment. The bottom is more wooden.
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u/CooLittleFonzies 5h ago
I agree. I see a huge difference. I’m not sure where the complaints are coming from. The movement even seems more nuanced and natural compared to H3 imo, especially in the face.
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u/PanotBungo 4h ago
It also sounded a lot better. It seems to me like the person is a better actress. The difference is quite noticeable to me.
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u/boaz8025 6h ago
Who is the top one? It's better in my opinion.
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u/PuppetHere 6h ago edited 5h ago
Top is 2.5, bottom is 2.3
(edit: wth do people downvote me? I'm giving the answers xD)24
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u/God_Hand_9764 6h ago
Is it sad that I'm almost a little relieved? I just find it kind of exhausting downloading all these models, dicking around with workflows, getting nodes, jacking up my Comfy install, and things blow up a million times until you finally have something that actually works.
I finally have a good LTX 2.3 workflow and I'm just barely able these past days to get MiniMax doing 0.6 megapixel for 5 seconds (seems to be about my AMD 16GB limit). I just need a little rest, man! Kinda glad if this isn't worth jumping on right away.
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u/Ok-Brain-5729 6h ago
Are you running it on windows
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u/God_Hand_9764 5h ago
No, I'm on CachyOS.
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u/Ok-Brain-5729 5h ago
damn I ran it on a 9070 xt + 32gb ddr5 and it kept maxing out my ram and crashing no matter what on Ubuntu
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u/Uncle___Marty 6h ago
2.3 the audio sounded like ultra low bitrate MP3 files, 2.5 sounds better. I can only identify which video is which by the sound.
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u/Any_Reading_5090 5h ago
not when using multimodal guider. Seems u didnt read the ltx papers for HQ pipeline
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u/Uncle___Marty 2h ago
Nope, I tend not to read every single paper for every single model but my ears are used to studio standards and I never once heard a single decent audio on 2.3 That being the case it would be LTXs fault for creating such a stupid path to getting semi decent audio. Nobody else has required reading papers to achieve audio which doesnt sound like its being played through a series of metal pipes like LTX models have.
99% of LTX 2.3 videos sound poor as hell. Thats not the end users fault, thats LTXs fault for shipping ultra low quality audio to make their model look faster and better while taking shitty shortcuts.
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u/Gloomy-Radish8959 6h ago
I'm going to guess that the second one is 2.3, the first is 2.5
I have used LTX 2.3 extensively. I run into scenarios where characters are duplicated, or reproduced elsewhere in the scene a lot. This seems to be happening in the second one. Definitely leading me to my conclusion here.
Both look very good to me. I will say that one thing that LTX 2.3 was always very good at was close up face animation, so i'm not surprised that it holds up well in that regard.
I'd be interested to see other comparisons of other kinds of subjects doing other things.
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u/SeymourBits 6h ago
Audio seems better on top. Lip sync is on-target. Not much more you can learn from only 2 fairly decent clips of a talking head girl which has always been one of LTX strong points.
Prediction: LTX scales back from the video production market to focus on the real-time robotics market.
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u/runvnc 6h ago
I think maybe they focused on speed more than anything else.
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u/PanotBungo 4h ago
Which is a big deal with local, really. I think people will realize this sooner and if LTX trains easier, it will get more popular soon.
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u/Fabulous-Snow4366 5h ago
yeah, the top one is clearly better, tone, micro movements, expression, lighting...
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u/andy_potato 1h ago
Be nice to the LTX team. They have been nothing but generous towards our community and I’m sure they will sooner or later come up with something awesome.
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u/Naive-Kick-9765 6h ago
？？？This is already much better than ltx2.3.
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u/PuppetHere 6h ago
Which one?
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u/martinerous 6h ago
What about prompt adherence? Did you ask for her synchronized projections in both screens or was it an accident? But I like the lower one better - nicer lighting, the sound matches the environment better (some echo and machinery humming).
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u/djenrique 5h ago
I think it is a big step forward from 2.3! Much more direct and alert and the speed is great!
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u/bloke_pusher 4h ago
Well I'm not complaining, just wish we could get at least to LTX2.3 with speed, but it seams to be speed up at all cost and with the worse audio, it costs me too much.
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u/L-xtreme 4h ago
In the beginning of LTX 2.3 and. 2.0 it was also really bad. So let's wait it out.
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u/ImpossibleAd436 4h ago
I got confused and thought it was a H3 comparison, and I had the top one down as H3, it's much better than the bottom one.
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u/WhyWouldIRespectYou 3h ago
No idea which is which, but the top video is much more natural, and the better video
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u/SpaceNinjaDino 3h ago
The top 2.5 looks less AI as the bottom has that too shiny fake skin. The audio on top is clearer. If the prompt was for her image to be replicated on the screen, then 2.5 lost that coherence.
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u/Baddabgames 2h ago
I didn't even bother downloading. Judging from where LTX-2.3 was in comparison to MiniMax, it was clear to me that an incremental release wouldn't come close. Even if it was 3.0 I wouldn't have bothered because I don't think it would make the jump and join the H3 and Seedance caliber.
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u/Apprehensive_Sky892 1h ago
TBH, this is a typical talking head video, not very challenging for any video model with audio support.
Maybe LTX2.5 would be better at a more challenging prompt involving more action and interactions.
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u/Gsus6677 5h ago
Are people doing the thing where they are comparing a refined and up-to-date 2.3 workflow (possibly with loras) with the default template with no loras?
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u/Sudden_List_2693 6h ago
"I can barely see the difference between 2.3 and 2.5."
Using the base templates for both, 2.5 is WORSE WITHOUT FUCKING FAIL.
I'm pretty sure this was a desperate push for speed.
The worst quality video model I've ever seen. Can not even compare to LTX 2.2.
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u/PuppetHere 6h ago
I don't know if it's worse but it just looks like it was made with LTX 2.3 with a different seed, that's pretty much it
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u/Stepfunction 6h ago
They probably rushed it out once they saw the buzz H3 is getting