This ComfyUI workflow expands your video to a new target aspect ratio using frame-by-frame outpainting, preserving your original content while synthesizing context around it. It ingests your clip with VHS_LoadVideo (Video Helper Suite), where you can non-destructively trim the segment to process via the skip_first_frames and frame_count controls. A custom outpainting processor (node UUID: 2e37ecc9-770a-4ac2-972c-e953901f49d3) generates the surrounding pixels that are missing in the new canvas, so you don’t have to crop or stretch the source.

Under the hood, the workflow splits the video into frames, processes each frame to match the desired aspect ratio, then stitches everything back together using VHS_VideoCombine at your chosen frame rate. MarkdownNote provides in-graph guidance. The outpainting step is tuned for image-consistent results (IC LoRA) so borders remain coherent from frame to frame. The result is a reformat that fits your target platform without chopping off important content or introducing visible stretching.