HappyHorse 1.1

HappyHorse 1.1 is the Alibaba video generation entry in the Runware pack, and it's the rare node here where the UI tells you exactly how the vendor thinks about video: there's a size dropdown with 13 presets, from "None (model default)" through 720p and 1080p in every aspect ratio (16:9, 9:16, 1:1, ~4:3, ~3:4) to "from input" variants. No fiddly pixel math - you pick your delivery format and go. That's HappyHorse's whole vibe: a practical, output-format-first video model rather than a raw-resolution playground.

It's a hybrid input node. You can feed referenceImages for style or subject reference, frameImages for image-to-video (or multi-frame), and positivePrompt on top - or any combination. In practice most people land on: still from an image model in frameImages, a motion prompt, a size preset, and a duration. It's also the rare video node in the pack that gives you a proper duration slider as a real number (3 to 15 seconds, default 5) instead of a toggle - which says something about how the model is meant to be driven.

What you set

• positivePrompt - what happens in the clip.
• frameImages / referenceImages - the visual anchors.
• size - the preset dropdown. The tooltip notes only one of resolution or dimensions is sent, so pick a preset and don't also try to set raw dims (there aren't any - this node is preset-driven).
• duration - 3 to 15 seconds, step 1, default 5.
• seed - up to 2^31-1, standard.
• numberResults 1-4, safety.mode none/fast/full, outputFormat MP4/WEBM/MOV, outputQuality 20-99.

Output is video (VIDEO).

How it works

Standard pack machinery - model AIR + taskType over REST via the Runware SDK, media converted back to a native VIDEO, cost on the title bar. Video is the most expensive modality in the pack per run, and HappyHorse is no exception, but the preset system keeps you honest: pick 720p for drafts, promote to 1080p for finals. The duration slider is a real saving, too - a 3-second test clip costs a fraction of a 15-second one, and you don't need the long cut to test whether the motion works.

Installing

ComfyUI Manager → search Runware → install → restart. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/Runware/ComfyUI-Runware
pip install -r ComfyUI-Runware/requirements.txt

No model downloads; dependencies are runware-sdk, pillow, soundfile. API key via Settings → Runware API key, RUNWARE_API_KEY, or runware auth login.

Troubleshooting

Key first, always. If your video comes back at the wrong aspect, check the size preset rather than blaming the input - the preset wins. And if you're coming from the Hailuo nodes expecting a width/height pair, there isn't one here; that's the HappyHorse design, and the presets cover everything you'd set anyway.