The graph builder is now parameterized by model family instead of assuming LTXAV. H3
keeps the core's shape but three of its nodes do not apply: LTXVConditioning (stamps LTX's
frame_rate onto conditioning, which H3 has no field for), LTXVConcatAVLatent (H3's own
EmptyMiniMaxH3LatentAV emits both streams, so the latent feeds the sampler directly) and
LTXVAudioVAEDecode (reads an output_sample_rate H3's audio VAE does not define — it would
raise). Requirements, wirable ports, role targets, guided-wiring hints and the port picker
all follow the family, so a loader can no longer be wired into a node the graph never emits.
The family is a Models setting, asked and never guessed from a checkpoint filename: a wrong
guess fails deep inside ComfyUI at generate time instead of in the panel that can fix it.
Video references now work, rather than being refused. FunPack owns the pipeline and already
requires ffmpeg for preview/export, so minimax_h3 decodes reference clips itself — once, at
24 fps — and derives both views from that single decode: the 2 fps timestamped frames Qwen
sees, and the full-rate latent block the DiT packs. A clip's own soundtrack rides with it,
presented as its <Audio j> label immediately before its <Video k>, which is what ties the
two together. Capped at 15s because reference tokens ride every sampling step.
Editor UI: a Reference media view (H3 only — there is no LTX equivalent to grey out) with
per-type 1-based tags shown exactly as the prompt must spell them, reorder controls that
renumber both sides at once, and a soundtrack picker on video entries. Warning chips beside
Generate for the LTX-only sampler settings H3 switches off, so that is known before a
generation is spent rather than after; Easy Gen gets the same warnings on its strip and the
same family selector (it already loads models.js and pipeline_caps.js).
Verified live in the Cutting Room: the family toggle flips requirements, ports and hints
both ways and persists per project; tags renumber on reorder; the H3 chips replace the
Best-FaceID chip on H3 and hand back to it on LTXAV.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
