ltx-2.3-spatial-upscaler-x2-1.0 causes unwanted text/overlay
Using the 2 stage workflow, the upscaler is causing an unwanted text overlay or "endscreen" looking garbled AI text at the end of every 20 second video. Shorter videos don't seem to be affected and I don't have hardware to try longer. I believe I have narrowed it down to the upscaler being the cause but I can't be certain, If I remove the upscaler and generate the 20 seconds in a 1 stage workflow I don't get the issue so that is my reasoning. I don't know what to do to solve this, I tried the older ltx2 upscaler but obviously it no longer works with the updated model...
I have had the same problem. U have to use the new sigmas and preprocessing values then it will work.
Using a 1.5x upscaler worked without any problems. There didn't seem to be any artifacts.
However, since 1.5x is not divisible by 768x512, I specified 768x480. In the first stage, instead of resizing to 0.5x, I specified 512x320 in the Resize v2 node.
Having same issue. Last 10 frames with the X2 upscaler will always have something completely random in it.
1.5X doesnt have that issue.
I have tried the suggestion of using different sigmas and preprocess values but that didn't get rid of the issue, it "changed" it slightly so that its more of slight "flash" of something popping up but it's still there, tried many different sigmas but can't get rid of it. I will try the 1.5x upscaler until this is addressed.
Same. See the screenshot, either a slight flash (left) or some kind of logo/unwanted text overlay (right).
I have had the same problem. U have to use the new sigmas and preprocessing values then it will work.
The new manual sigma value for the upscaler is 0.85, 0.7250, 0.4219, 0.0 and the preprocess value is 18 I think? The manual sigma for the 8-steps first sampler hasn't changed according to the workflows from https://github.com/Lightricks/ComfyUI-LTXVideo/
Same. See the screenshot, either a slight flash (left) or some kind of logo/unwanted text overlay (right).
I have had the same problem. U have to use the new sigmas and preprocessing values then it will work.
The new manual sigma value for the upscaler is 0.85, 0.7250, 0.4219, 0.0 and the preprocess value is 18 I think? The manual sigma for the 8-steps first sampler hasn't changed according to the workflows from https://github.com/Lightricks/ComfyUI-LTXVideo/
This is exactly the issue I'm seeing, still haven't got it to go away, I've resorted to using a first-middle-last frame workflow and setting the "middle" frame to whatever frame I actually want the video to end on and then just cutting the remainder between the middle and final frame. For example if I want 480 frames at 24 fps I set my total frames to 504 and put my middle frame at 480 and then just cut 481-504 and that seems to be working for now. Obviously if you don't use img2vid then I don't know. Either way this needs to be addressed or an explanation of why it's happening.
It seems to happen on 1.5X as well if you have a lot of frames but not as often as 2X which is almost 99% of the time.
Iv just gone with trimming the end and back to the 2X upscale to keep thing simple for scaling.
I'm also getting this artifacts at the end of the video. I thought at first it was the workflow that I'm using. But then I tried some other workflows and I'm getting the same result with the artifacts at the end. In my case, it happens when my video is longer than 15 seconds.
I'm also getting this artifacts at the end of the video. I thought at first it was the workflow that I'm using. But then I tried some other workflows and I'm getting the same result with the artifacts at the end. In my case, it happens when my video is longer than 15 seconds.
I guess all we can do for now is to generate longer than needed and trim the offensive frames. Even the 1.5 upscaler this happens from time to time. It seems like the training data was polluted with endscreens and logos and ads or something. Such a shame for an otherwise excellent model.
It seems to be always the final 14 frames that are affected.
It seems like the training data was polluted with endscreens and logos and ads or something. Such a shame for an otherwise excellent model.
Yes and why didn't they notice it? There's also always some background music added at the end, which also seems to come from endscreens or ads. And the fonts of the letters seem to be Vietnamese?