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Resolve negative frame_idx before deciding causal_fix

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ozbayb 2026-04-29 17:55:35 -06:00
parent 9190234ec6
commit 5142bed528
1 changed files with 5 additions and 1 deletions
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6
comfy_extras/nodes_lt.py
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@ -346,7 +346,11 @@ class LTXVAddGuide(io.ComfyNode):
# For mid-video multi-frame guides, prepend+strip a throwaway first frame so the VAE's "first latent = 1 pixel frame" asymmetry lands on the discarded slot
time_scale_factor = scale_factors[0]
num_frames_to_keep = ((image.shape[0] - 1) // time_scale_factor) * time_scale_factor + 1
causal_fix = frame_idx == 0 or num_frames_to_keep == 1
resolved_frame_idx = frame_idx
if frame_idx < 0:
_, num_keyframes = get_keyframe_idxs(positive)
resolved_frame_idx = max((latent_length - num_keyframes - 1) * time_scale_factor + 1 + frame_idx, 0)
causal_fix = resolved_frame_idx == 0 or num_frames_to_keep == 1
if not causal_fix:
image = torch.cat([image[:1], image], dim=0)