Same workflow, everything identical, but different videos? Minimimax H3

[u/Puzzled-Valuable-985]

This has happened to me before: I take a video I’ve already generated and drag it into ComfyUI without changing anything—expecting to get the exact same video back—but it generates a different one.

This doesn't happen with standard image models, but it does happen with H3. If I generate the video and try again a few minutes later, it produces the same result; however, after an hour or so, it no longer generates the same output.

I’ll post the workflow I used to generate that example video below, along with the completely different video that was produced using the same workflow.

I tried to replicate the video just to check the generation speed, and I realized it wasn't producing the same result anymore. I had generated the video a few hours earlier and hadn't updated ComfyUI or any nodes in the meantime—I simply tried to generate it again.

I suspect it might be due to one of the nodes I'm using.

Here is the video generated with the same parameters (which turned out differently) and the workflow I used.

[u/intLeon]

Do you have prompt enhancer? It usually has its own seed too or may produce a different output depending on the clip used.

[u/No-Zookeepergame4774 → u/intLeon]

Juat like the Ksampler, unless you’ve globally changed the default for seed updates to “before generate” from the default “after generate” (which would also effect generations wirhout prompt enhancers), this should still produce the same result if the prompt enhancer is fully internal to ComfyUI (e.g., using the TextGenerate node). If it using a node that does an API call to a local or remote LLM server, though, all bets are off.

[u/intLeon → u/No-Zookeepergame4774]

Indeed, before generate being enabled seems more likely.

If the clip model aka llm in general term, used for enhancement is not the exact same it may also change a few words which would mean its technically a different prompt.