  This paper introduces StreamV2V, a diffusion model that achieves real-time
streaming video-to-video (V2V) translation with user prompts. Unlike prior V2V
methods using batches to process limited frames, we opt to process frames in a
streaming fashion, to support unlimited frames. At the heart of StreamV2V lies
a backward-looking principle that relates the present to the past. This is
realized by maintaining a feature bank, which archives information from past
frames. For incoming frames, StreamV2V extends self-attention to include banked
keys and values and directly fuses similar past features into the output. The
feature bank is continually updated by merging stored and new features, making
it compact but informative. StreamV2V stands out for its adaptability and
efficiency, seamlessly integrating with image diffusion models without
fine-tuning. It can run 20 FPS on one A100 GPU, being 15x, 46x, 108x, and 158x
faster than FlowVid, CoDeF, Rerender, and TokenFlow, respectively. Quantitative
metrics and user studies confirm StreamV2V's exceptional ability to maintain
temporal consistency.
