The purpose of this ComfyUI workflow (Image/Frame(s)/Video To Video process) is to manage batch generations of multiple file items found in a folder with varied mixed image/video file formats (including PSD file format for layers to define frames) through a unified VACE workflow . ((note: this can be swapped out to other types of workflows), but VACE was used because it's most versatile to fit all use cases under the V2V/I2V/FLF2V umbrella)
This sets up the VACE's control video. Various file formats are supported (see last section below). These files are all located in the main source folder as specified in workflow, so you can switch it to any other folder as when needed.