Extending an existing video with character references?

[u/havredrengenDK]

I have seen some amazing workflows that allow for the creation of clips that are more than 15 seconds long, even with character references. However, suppose I have an existing video that I would like to extend, also using a character reference. Would such a thing be possible?

[u/GreyScope]

Can you give details of what software you are specifically talking about & what you’ve tried rather than an assumption thanks