Maestro v1.5.5 with MiniMax H3 is out!

v1.5.5 (2026-08-04)

MiniMax H3 local audio-video generation

• Added native local MiniMax H3 Base FL2VA support with text-to-video, image-to-video, and first/last-frame video generation.
• H3 generates synchronized 32 kHz stereo audio together with the video instead of requiring a separate audio pass.
• Added approximately 5-15 second generation at 24 FPS with landscape, portrait, square, native 768p, and lower-VRAM resolution options.
• Added automatic, revision-pinned provisioning for the compact scaled-FP8 transformer, NVFP4 Qwen3-VL conditioner, video VAE, audio VAE, tokenizer, and processor assets.
• The initial integration focuses on H3 Base FL2VA; H3 Ref2VA reference-video/audio conditioning and hosted 2K regeneration are not yet included.

H3 prompting and dialogue

• Added an H3-specific Context-IR Prompt Enhance workflow using the model's native multimodal description, soundscape, music, speaker-ID, and dialogue-tag structure.
• Vague requests such as two characters discussing a subject can now be expanded into concise, meaningful dialogue sized to the selected duration.
• User-supplied dialogue is preserved verbatim, and remaining time is assigned to silent visible action to reduce invented speech and gibberish.
• Start-frame prompts now receive the correct H3 image-alignment instruction while raw prompting remains available by simply not using Prompt Enhance.
• H3 enhancement bypasses the incompatible generic cinematic enhancer and remains one native timeline instead of being divided into false sliding-window paragraphs.

H3 compatibility, memory, and reliability

• Corrected compact Qwen3-VL prompt conditioning so H3 follows the requested subject instead of producing unrelated repeated scenes.
• Added native row-scaled INT8 embedding support and corrected NVFP4 pre-quantization and combined-scale handling for Comfy-format checkpoints.
• Fixed mixed-dtype model profiling, keyframe CPU/CUDA device mismatches, and first-frame generation failures.
• Added activation chunking, explicit transformer working-memory reservation, and MMGP-friendly dtype locks so H3 can stream on consumer GPUs without starving the first denoising step.
• Added regression coverage for prompt conditioning, quantized checkpoint loading, keyframes, scheduler behavior, audio output, activation chunking, and H3 prompt structure.

Multi-character Recast continuity

• Improved SCAIL-2 Recast when a mapped character enters later within an otherwise continuous camera shot.
• Added hidden identity pre-roll conditioning so late-arriving characters can be introduced without publishing an artificial visible cut.
• Recast assembly now validates that all generated segments are present and that the final output retains the exact source timeline length.
  This clip was made locally in Maestro’s dead-simple UI for free! 🤯