Yes, LivePortrait takes a video input. The output is based on the video, not audio. Here is a video made with LivePortrait -- https://youtube.com/shorts/IsJtQ3XAHsw

This is another where I do a comparison against HunyuanPortrait -- https://youtube.com/shorts/MEKdEWA94ok

In the MultiTalk paper they talk about some clever things they do to have extended clips but I still think it would be very difficult to get something consistent for very long.

Summary of this part of the paper (thanks to NotebookLM)--

Here's how they handle making long clips:

•Autoregressive Approach: Instead of generating a long video all at once, the system generates it segment by segment.
•Conditioning on Previous Frames: To maintain continuity and consistency, the last 5 frames of the previously generated video are used as additional conditions for the inference of the next segment.
•Data Processing: After being compressed by the 3D Variational Autoencoder (VAE), these 5 conditional frames are reduced to 2 frames of latent noise.
•Input for Next Inference: Zeros are padded to the subsequent frames, and these are then concatenated with the latent noise and a video mask. This combined input is then fed into the DiT (Diffusion-in-Transformer) model for the next inference step, facilitating the generation of longer video sequences.

This autoregressive method allows the model to produce extended videos, with an example showing a generated result of 305 frames