Power Load Video (QQ)

The stock ComfyUI video loaders are fine for "load file, get frames," but they give you nothing to look at. PowerLoadVideo is the version that treats video like video: a drag-and-drop file loader that previews in-canvas with an actual timeline - play/pause, loop boundaries, the works. When you're building a Wan workflow around an existing clip, that preview isn't a luxury, it's the thing that lets you find the frame you actually want without exporting to an external player.

It's one of the flagship nodes of siraxe/ComfyUI-WanVideoWrapper_QQ, sir_axe's experimental Wan pack - and it's arguably the pack's best advertisement. The README calls out that it can override ComfyUI's default drag-and-drop behavior so a dropped video creates this node instead of a plain loader, but that's optional and off by default.

How it works

Under the hood it's OpenCV doing the heavy lifting (cv2.VideoCapture), reading frame-by-frame into an IMAGE tensor of shape [frame_count, H, W, 3] while also extracting the audio stream into ComfyUI's AUDIO format (a waveform/sample-rate dict). The FPS is read from the container's metadata. Nothing exotic - the value is the UI wrapped around it: the preview has a timeline with [ / ] loop markers you can scrub, Shift+Spacebar to play/pause, and Shift+Drag on the markers to set loop boundaries.

Inputs and outputs that matter

Everything's optional, which is the point - it's a loader, so most of these are conveniences:

• video - the file picker. This is also where you drag-and-drop a video.
• start_frame / end_frame - trim range (1-based; -1 = run to the last frame).
• force_fps - reinterpret the output FPS, same logic as VideoHelperSuite's force_rate. 0 = keep native.
• max_fps - cap the output frame count by sampling the source at a lower rate. Handy when you need a preview-speed pass before committing to a full render.
• crop_enabled + crop_x/y/w/h - normalized (0–1) crop before output, useful for squaring up a 16:9 clip for a 1:1 Wan generation.

Outputs are IMAGE, AUDIO, and FPS. The FPS output is the sleeper: wire it into a Wan workflow's video-combine or sampler setup so your output video honors the source's frame rate instead of assuming 24.

Installation

cd ComfyUI/custom_nodes
git clone https://github.com/siraxe/ComfyUI-WanVideoWrapper_QQ.git

Restart ComfyUI, or grab it via ComfyUI Manager (search "WanVideoWrapper_QQ"). Two practical notes: this node needs OpenCV (opencv-python), which the pack's empty requirements.txt won't install for you - if cv2 isn't already in your ComfyUI env, pip install opencv-python in that environment. And if you've got an old wanwrapper_qq folder from before the v1.3.4 rename to ComfyUI-SA-Nodes-QQ, delete it to avoid import collisions.

Common issues

The big one: on the very first run after enabling it, the drag-and-drop override can feel like ComfyUI "broke" - if you didn't want that behavior, the README notes it's optional and off by default, so check you're on a recent version before blaming your install. Otherwise, expect the classic OpenCV quirks: some codecs (HEVC in particular) will fail silently depending on your ffmpeg/opencv build, and exotic frame rates read back as odd values. The crop sliders are normalized, so remember crop_w: 0.5 means "half the width," not "500 pixels" - a common first-run surprise.