diffusers stable-diffusion stable-diffusion-diffusers text-to-image text-to-video tune-a-video arxiv:2212.11565 arxiv:2112.10752 base_model:CompVis/stable-diffusion-v1-4 base_model:finetune:CompVis/stable-diffusion-v1-4 license:creativeml-openrail-m diffusers:TuneAVideoPipeline region:us