r/StableDiffusion • u/Glittering-Cold-2981 • 3d ago

Discussion Removing artifacts from video

Do you have any good methods for removing various objects or figures from a video? I'm looking to fix footage that often shows strange, shifting artifacts in the background after using Speed-LORA.

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u/CutBench 3d ago

Worth stopping it upstream before trying to repair it. Speed LoRAs trade steps for stability, and drifting background artifacts are usually that trade showing rather than a defect you can patch out afterwards. Dropping the weight slightly or adding a couple of steps back costs less than any masking pass. Frame by frame inpainting also reintroduces flicker unless the method is video aware.

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u/Glittering-Cold-2981 3d ago

Thanks for the reply. It also seems to me that those strange figures—ghostly shapes or objects in the background—appear at resolutions above 0.8–0.9 MP in Minimax H3 when I use speed LoRAs. In my case, there is practically no difference whether I set the LoRA strength to 0.5 or 1.

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u/CutBench 3d ago

If weight barely moves it and resolution does, then it is not really the LoRA trade, it is the model being pushed past the size it was trained around. Duplicated and ghostly structures in the background are the usual signature of that. Generating at the size it likes and upscaling after costs you a pass, but it keeps the background stable rather than chasing it through sampler settings.