AIHub Action New Video

AIHub Action New Video is the node that gets a generated video out of ComfyUI and into the editor that's driving the workflow. You've produced your video - Wan, LTX, Hunyuan, whatever the current flavor of the month is - and this node takes the VIDEO handle, encodes it, and sends the clip back to the client under a NEW_VIDEO event. It's the video twin of AIHub Action New Image, right down to the APPEND/REPLACE and optional autoplay fields.

Pack context: this comes from otavanopisto's ComfyUI-aihub-workflow-exposer, the bridge that lets external apps run ComfyUI as their generation engine. Expose nodes pull frames and segments in from the client; action nodes push results back over the pack's own websocket (port 8111). This node is squarely outbound.

How it works

The node takes the VIDEO value (which in ComfyUI is a path to a rendered video file), re-encodes it through ComfyUI's video tooling into the requested container/codec, and streams the bytes to the client. The envelope carries the filename, the APPEND/REPLACE file action, the mime type, and the autoplay flag. Note the "auto" defaults: format = auto and codec = auto mean "keep whatever the source already is," which is usually what you want - you only override them when the client needs a specific container.

The inputs that matter

• video (required) - the path of the video file to export. In practice you wire this from whatever video-output node your model wrapper uses.
• format - auto or mp4. Auto passes through; mp4 forces the container.
• codec - auto or h264. Same idea at the codec level.
• crf - the H.264 constant rate factor, 0–51, default 23. Lower is better quality (and bigger); the tooltip helpfully warns it only matters for codecs that support it, like H.264. For video-to-video work where you're re-encoding, don't just leave this at the default out of habit - CRF 23 is decent, but for a final deliverable you often want 17–20.
• action - APPEND/REPLACE for the stored file.
• name / file_name - friendly name and optional explicit filename. An extension is derived from the format if you don't override.
• autoplay - whether the client plays the clip immediately on receipt.

No outputs. Side-effect node.

Installing it

ComfyUI Manager (search "ComfyUI-aihub-workflow-exposer"), or:

cd ComfyUI/custom_nodes
git clone https://github.com/otavanopisto/ComfyUI-aihub-workflow-exposer
# restart ComfyUI

No model downloads or extra pip packages - the pack builds on ComfyUI's existing video stack.

Where people get burned

The standard one: your editor receives a clip it can't play because the client expects a specific codec and you left everything on auto, so the source format sailed through. If your client is picky, set format/codec explicitly rather than assuming auto is right. And remember the pack-wide rule - if no aihub client is connected to the websocket, this node runs "successfully" and the video simply goes nowhere visible.