A mode on the existing sampler, not a new node. h3_causal_chunks generates the
clip in time chunks that each attend to a KV cache of the ones before them, so
a long clip stays one continuous shot with real memory instead of separate
scenes stitched together. Sink and window are exposed as what they actually
are: chunks pinned from the start, and recent chunks still remembered.
Two defects found while auditing the bridge I had sketched earlier (which a
blanket `git add -A` had swept into an unrelated commit — it was dead code, but
it should not have gone in under that message):
- it read request.video_channels / audio_channels, which do not exist on
RAVEN's LatentRequest. First real call would have been an AttributeError.
- it handed BOTH streams the same sigma. H3 denoises audio on its own shifted
grid (3 against video's 12), so that is exactly the error h3_audio_clock
exists to correct, and it bites hardest on the few-step schedules this lane
is built for. Audio now goes through the same remap, transcribed from
comfy.ldm.minimax.model.time_shift_sigma and verified equal to the live
function across the range.
The lane REPLACES the sampler rather than wrapping it, so every reason it
cannot run falls through loudly: not H3, pack not installed, stock
bidirectional model. A rollout that fails mid-way raises rather than quietly
falling back to ordinary sampling, which would return a clip under a mode the
user believes ran. The run states that the wired sampler and CFG are unused on
this path, and that there is no per-chunk redo.
Editor: Settings > Engine > Sampler > Experimental, hidden entirely off H3.
Tests: 1714 passed (+18). Never run on hardware.
digital-garbage
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