Add H3 two-beat save-video test flow

custom/chris/minimax-h3-two-beat-savevideo-test/README.md

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+# MiniMax H3 Two-Beat SaveVideo Test
+
+Practical test flow for `DumasH3LongVideos` that:
+
+- uses `LoadImage` refs derived from images stored in this repo
+- renders exactly 2 beats
+- stays under 10 seconds total
+- converts the returned image batch with `CreateVideo`
+- saves the final file with `SaveVideo`
+
+## Repo source images
+
+- Character ref:
+  `optimized/image-to-video/minimax-h3-r2v-master/references/default-character-reference.jpg`
+- Location ref:
+  `optimized/image-to-video/minimax-h3-r2v-master/references/default-location-reference.jpg`
+
+## ComfyUI input names used by the prompt
+
+Upload those repo images into the live ComfyUI input folder with these names:
+
+- `default-character-reference.jpg`
+- `default-location-reference.jpg`
+
+The included `api-prompt.json` expects those names in `LoadImage`.
+
+## Flow summary
+
+`LoadImage x2 -> DiffusionModelLoaderKJ / CLIPLoader / VAELoader x2 -> DumasH3LongVideos -> CreateVideo -> SaveVideo`
+
+## Timing
+
+- `shot_seconds = 3`
+- `2 beats`
+- total target runtime = `6s`
+
+## Notes
+
+- This is a practical API flow, not a promoted master workflow.
+- The H3 node is configured for a cheap proof run, not final quality.

custom/chris/minimax-h3-two-beat-savevideo-test/api-prompt.json

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+{
+  "1": {
+    "class_type": "LoadImage",
+    "inputs": {
+      "image": "default-character-reference.jpg"
+    },
+    "_meta": {
+      "title": "Character Ref"
+    }
+  },
+  "2": {
+    "class_type": "LoadImage",
+    "inputs": {
+      "image": "default-location-reference.jpg"
+    },
+    "_meta": {
+      "title": "Location Ref"
+    }
+  },
+  "10": {
+    "class_type": "DiffusionModelLoaderKJ",
+    "inputs": {
+      "model_name": "minimax_h3_ref2va_pruned_int8_convrot.safetensors",
+      "weight_dtype": "default",
+      "compute_dtype": "default",
+      "patch_cublaslinear": false,
+      "sage_attention": "disabled",
+      "enable_fp16_accumulation": false
+    },
+    "_meta": {
+      "title": "Load Model"
+    }
+  },
+  "11": {
+    "class_type": "CLIPLoader",
+    "inputs": {
+      "clip_name": "qwen3vl_32b_minimax_h3_nvfp4_awq.safetensors",
+      "type": "minimax",
+      "device": "default"
+    },
+    "_meta": {
+      "title": "Load CLIP"
+    }
+  },
+  "12": {
+    "class_type": "VAELoader",
+    "inputs": {
+      "vae_name": "minimax_h3_video_vae_int8_convrot.safetensors"
+    },
+    "_meta": {
+      "title": "Video VAE"
+    }
+  },
+  "13": {
+    "class_type": "VAELoader",
+    "inputs": {
+      "vae_name": "minimax_h3_audio_vae_fp32.safetensors"
+    },
+    "_meta": {
+      "title": "Audio VAE"
+    }
+  },
+  "20": {
+    "class_type": "DumasH3LongVideos",
+    "inputs": {
+      "model": [
+        "10",
+        0
+      ],
+      "clip": [
+        "11",
+        0
+      ],
+      "vae": [
+        "12",
+        0
+      ],
+      "audio_vae": [
+        "13",
+        0
+      ],
+      "ref_image_1": [
+        "1",
+        0
+      ],
+      "ref_image_2": [
+        "2",
+        0
+      ],
+      "prompt": "<Picture 1> pauses in the place shown in <Picture 2> and studies the surroundings in a steady medium shot.\n\n<Picture 1> walks forward through the place shown in <Picture 2> as the camera follows from the side.",
+      "anchor_override": "short silver hair, scar over the left eyebrow, slim build",
+      "character_memory": "weathered red flight jacket, grey cargo shorts, black boots",
+      "resolution": "16:9",
+      "megapixels": 0.1,
+      "steps": 6,
+      "cfg": 1,
+      "sampler_name": "res_multistep",
+      "scheduler": "simple",
+      "seed": 3,
+      "plan_only": false,
+      "shot_seconds": 3,
+      "ref_mode": "where tagged",
+      "per_beat_length": false,
+      "mute_nonspeech_audio": true,
+      "cleanup_between_shots": true,
+      "allow_res_backoff": true,
+      "decode_tile_frames": 8,
+      "decode_tile_size": 256,
+      "auto_soundscape": "fill if blank"
+    },
+    "_meta": {
+      "title": "Dumas H3 Long Videos"
+    }
+  },
+  "30": {
+    "class_type": "CreateVideo",
+    "inputs": {
+      "images": [
+        "20",
+        0
+      ],
+      "fps": 24,
+      "audio": [
+        "20",
+        1
+      ],
+      "bit_depth": 8
+    },
+    "_meta": {
+      "title": "CreateVideo"
+    }
+  },
+  "31": {
+    "class_type": "SaveVideo",
+    "inputs": {
+      "video": [
+        "30",
+        0
+      ],
+      "filename_prefix": "MiniMax/dumas-two-beat-savevideo-test",
+      "format": "auto",
+      "codec": "auto"
+    },
+    "_meta": {
+      "title": "SaveVideo"
+    }
+  },
+  "32": {
+    "class_type": "PreviewAny",
+    "inputs": {
+      "source": [
+        "20",
+        2
+      ]
+    },
+    "_meta": {
+      "title": "Info"
+    }
+  }
+}