Generate video with synchronized audio from a text prompt, optionally anchored by a first and/or last keyframe (MiniMax-H3 fl2va model).

With no keyframes this is pure text-to-video. Images may be a local file path (uploaded automatically) or a name already in ComfyUI's input folder. length is a frame count at 24 fps and snaps up to the model's 17k+5 grid; 124 frames is about 5 seconds, and the trained range is roughly 124-362. Leave width/height unset: they default to 864x480, which is both faster and closer to the prompt than larger canvases. Only raise it if the user asks. This produces ONE continuous shot - it cannot contain cuts, so for a multi-shot sequence call this once per shot and edit the clips together rather than describing several shots in one prompt. Takes MINUTES: ~3-4 min at the defaults on an RTX 4090, longer at higher resolution or step count. The response carries estimated_seconds; poll job_status at that cadence instead of assuming a long run has hung. Do NOT set sage_attention without first checking list_assets - if ComfyUI runs with --use-sage-attention, sage is already on and this is redundant. Returns immediately with a prompt_id - poll job_status to get the output.

Generate video with synchronized audio from a prompt plus reference images, videos, and/or audio (MiniMax-H3 ref2va model).

References are addressed positionally in the prompt as , and , all 1-based per type - e.g. "<Picture 1> walks through the door speaking in the voice of <Audio 1>". Max 9 images, 3 videos, 3 audio. A reference video's own soundtrack is passed through automatically. ref_image_size "match" scales references to the output's pixel area; "max" uses a 2048px short edge for better identity fidelity but is several times slower, since reference tokens ride through every step. This is the tool for CONSISTENCY ACROSS SHOTS: generate shot 1, pull a frame of the character or location from it, and pass it here as a reference for shots 2..n so they match. Leave width/height unset (864x480 default). Takes MINUTES; see estimated_seconds in the response and poll at that cadence. Check list_assets before setting sage_attention - it is redundant when ComfyUI already runs with --use-sage-attention. Returns immediately with a prompt_id - poll job_status to get the output.

Check a submitted H3 job. Returns queued / running / completed / failed, plus the output file paths once it has finished.

Cancel an H3 job: removes it if still queued, interrupts it if running.

Look at and listen to a finished H3 job.

MCP has no video content type, so this returns a contact sheet of frames sampled evenly across the clip (viewable as an image) plus the soundtrack as audio. Use it to actually judge a result before iterating on the prompt.

List what this ComfyUI can actually load: H3 models, and the images, videos and audio already sitting in the input folder (usable by name).