LTX 2.5 I2V basic workflow on ComfyUI is stuck forever if try to generate 10sec video
Hi, I just tried LTX 2.5 I2V, works great and fast for 5sec vids (like 2mn30 or so without Sage Attention), I have a 3090, 128Gb RAM, 150GB disk space but if I try 10sec (in medium res) it gets stuck forever in the decoding phase just before the video appears. On the console it's exactly like a successful 5 sec video, the only thing missing is the line "Prompt generated in 254 seconds" that you see in green.
Am I alone ? Any idea about what the issue might be ?
Go into the subgraph and change the VAE Decode (Tiled) node's tile size from 768 to 512.
I hope you realize that you only have 3090, it's not the best one to test the new video model.
That is the reason you get stuck.
I had the same issue, but with a 5090 32GB + 192GB DDR5 RAM—meaning the LTX 2.5 would freeze while decoding VAE in ComfyUI.
Changing 768 to 512 solved the problem, but it's quite odd—the entire generation process before decoding VAE takes 1.5 minutes on my card, but then the actual decoding takes another 1.5 minutes (with SageAttention enabled).
I'm using FLF2V, not Image to Video, at a resolution of 720x1280 with a video length of 15 seconds.
Go into the subgraph and change the VAE Decode (Tiled) node's tile size from 768 to 512.
Thank you, it works.
I hope you realize that you only have 3090, it's not the best one to test the new video model.
That is the reason you get stuck.
I do know that it's not the best, but DAK25 has a 5090 which is also not the best but much better than a 3090 and he had the same issue.