First Last frame video not keeping last frame the exact same fix.
Not sure if this has been discussed yet but I was having a problem with your LTX2.3 first last frame custom audio workflow specifically not ending with the EXACT uploaded end frame. It would basically generate it's own end frame that was somewhat close to the uploaded end frame but not the EXACT same. Well there is a fix for this that I have lightly tested but it did give me a good output with the EXACT last frame that I uploaded. All i really did was change the LTXVImgToVideoinplace node that was on the second pass that was hooked up to the spatial upscaler out for the inplace node that's in the first pass the "LTXVImgToVideoInplaceKJ" node when I put that node in the workflow with all the correct connections in the second pass just like how it is in the first pass the end frame ended up the EXACT same as my uploaded end frame. I just cannot get it to lip sync the custom audio now but I am still working on it but just thought I would let anyone who was having the same issue as me know how to fix the workflow.
Thats odd. Should work the same way. Will try here as well. And if it works better with LTXVImgToVideoInplaceKJ I'll update ;-)
It can help the lip-sync if you transcribe what the person is supposed to say in the text prompt. As well as "insist" the person is talking. Like : she talks with a soft British voice, and she say: ".....". Her lips move with perfect lip-sync to the attached audio