This workflow performs video frame interpolation in ComfyUI to make motion look smoother without changing the total playback time. It uses the comfyui-videohelpersuite for I/O and the comfyui-gimm-vfi custom node to synthesize in-between frames. VHS_LoadVideo ingests your source clip and exposes its frames and native FPS. Those frames are passed to the GIMM VFI interpolator node (UUID: 8d69124f-cc0e-4891-b9ca-9c1b04432c40), which inserts synthetic frames between each pair of originals according to an interpolation factor you set (for example, 2x or 3x). Finally, VHS_VideoCombine assembles the expanded frame sequence back into a video file.

Technically, the GIMM VFI node estimates motion between consecutive frames and generates temporally consistent intermediate frames. The MarkdownNote in the graph spells out the key timing rule: output_fps = input_fps × interpolation_factor. By multiplying the output FPS in VHS_VideoCombine to match the factor, the clip’s duration remains identical while motion appears more fluid. No diffusion or checkpoint models are required; everything hinges on the VFI node and reliable video read/write via the Video Helper Suite.