Two independent, silent breaks made an H3 i2v scene generate from the prompt
alone.
1. The Editor always runs split_by_transitions, and the per-scene conditionings
REPLACE the single entry Studio built — but they were re-encoded with no
reference_image and no h3_references. Both the frame-0 keyframe pin and the
Qwen vision presentation were gone before the sampler looked, even for a
one-scene project. The split now carries the anchor onto scene 0 and the
references onto every scene. Gated to H3: on LTX the anchor rides in the
latent, and adding Gemma3 vision to scene 0 would change existing output.
2. A MiniMax H3 Image to Video node hands its first/last frame pins out on its
CONDITIONING output, which had nowhere to go — the sampler's positive comes
from Studio. New optional h3_keyframes input on the Chain Sampler salvages
them: first frame onto the opening scene, last frame re-indexed onto the
closing scene's own final frame (the source node's frame_count is its own,
and a stale index would land mid-clip where PackedLayout refuses it). The
editor auto-wires it for H3 projects.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
v2a_grad_scale does nothing without joyai_audio_memory on any model, and
gating the chip on that toggle still left a warning about a knob the user
never asked about. Removes the chip, its fingerprint inputs, and the docs
line.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
H3 support was written against ComfyUI's PR; it has since merged (57500fc5, shipped in
v0.30.0) and the weights are out. Everything the adapter assumed still holds — audio time
axis, 17k+5 grid, batch-1 forward, the imported optimized_attention symbol, every payload
key — so this is what the release itself changed, not a correction of the reading. LTX-2 /
LTXAV is untouched throughout: a project picks a family and both are first-class.
* i2v anchors now work on H3. LTX writes the image into the starting latent
(LTXVImgToVideoInplace); H3 has no such path — its anchor is a condition row packed
beside the text — so a scene's anchor image becomes a frame-0 keyframe pin instead, and
the LTX node is no longer run against an H3 latent. Studio hands the source image's
pixels to the sampler (it owns the CLIP, the sampler owns the VAE). Pins now MERGE, so
a first-frame anchor and a last-frame guide coexist: H3's own first-and-last mode.
* Frame geometry follows the model: frames per scene snap to the family's grid (LTX 8k+1,
H3 17k+5) in both frontends, in the graph builder, and in the sampler, and H3 renders at
its fixed 24 fps. Picking a family moves the project onto its geometry and says so.
* The two checkpoints are named. fl2va (anchors) and ref2va (references) load identically
and never reject each other's conditioning, so the run reports which mode it is in and
the setup panel spells out the split.
* Pipeline setup is no longer a placeholder: released, with the published filenames.
* Reference images can be encoded at the reference pipeline's 2048px short edge.
Fixes found on the way:
* A video reference lost its soundtrack between Studio and the sampler — Studio had
already announced it to the text encoder as <Audio 1>, so every later audio ordinal in
the prompt pointed one reference earlier than written.
* Easy Gen never knew it was on H3: its model config lives on the project, which the
shared capability check did not read, so every H3 warning silently reported LTX.
* An off-grid scene length failed with arithmetic instead of an explanation.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Document the Movie Editor, update README for the 3.0 frontend direction, credit pipeline dependencies, and ship CHANGELOG/pyproject 3.0.0.
Co-authored-by: Cursor <cursoragent@cursor.com>
