Happy Horse Video Edit transforms an existing video using a text instruction and up to 5 optional reference images. Use @Image1 to @Image5 in the prompt to apply a referenced look, object, character, or style. Output follows the source duration when it is under 15 seconds and trims longer inputs to the first 15 seconds. It supports 720P or 1080P output, seed control, and audio handling with auto or original audio. Ideal for restyling, adding props, improving environments, and polishing product or character videos.