This is a simple but large workflow, i use all the time, using Wan2.2 and SVI Pro for long videos with consistency over multiple sections. It's a extended version of the default SVI Pro workflow. Much simpler than the (great) infinite loop workflow and other fancy svi pro based workflows. But it is more comprehensible and it is much easier, adjusting almost everything for every step individually, including extending the video step by step without re-doing everything every time. . Including the prompt. (disconnect the get_length and so on node from a chunk to set it manually).

I made a little video explaining all this in a ... video. Alternative to the text below. the first 6 or so minutes explain how to slowly develop a video.

Be aware, it is - poorly - ai voiced. But i think it shows it off quite well AND makes clear what i talk about here.

The TL;DW summary is here: Even at 4/2 steps using Wan2.2 Remix 2.1, the results re good, though around halfway through the image gets seriously less detailed. Having run it also with 8/4 steps at 1MPx for 24parts (took a long time, and step by step extending, see below.), the image quality stays remarkably good even after 24 parts. That video stays private though. It is in theory infinitely extendable.

little tips and tricks, applying to other, similar workflows too:

One easy to see and use advantage is that once a chunk is rendered (you visible see it when it's done), ComfyUI stores it's finished frames in node cache, and it will just return these frames without rendering the next time. So you can connect the next chunk (prompt) and run the workflow and all previous chunks are skipped because their frames are already buffered.

All settings including Seed and prompt of the already finished chunks need to remain the same though. Otherwise it will start over.

So you can slowly develop a video bit by bit, even stop and adjust without losing progress. For example if you see in the running preview ) that it does something weird, you can just stop it. then adjust the prompt to prevent that, and run it again and it will do that chunk again with the new prompt, but all previous ones just return their frames again from cache.

btw: (live running preview needs videohelpersuite installed in comfy, than in it's settings you can turn it on. It saves a LOT of time to notice if something goes wrong. )

It's a complete game changer for long multi bit video workflows for me (when i discovered the magic of FIXED seeds) . You're not helpless when something goes wrong halfway through.

I DID run into a problem: it uses ram. When running all 18 parts and at length 101 per chunk, i hit the ceiling of my 96GB ram on the final overlapping step (before the video is saved) and everything got QUITE slow.

On lower ram you may want to keep that in mind when using many chunks/higher length, higher res.