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Fix transition coverage and allow disabling (duration=0)

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- transition_duration=0 now fully skips boundary recording and all
  effect application (previously min was 2 and effects always ran)
- Pixel path: half now covers the full blend zone (blend_half_pixels =
  video_overlap//2 * time_scale) plus transition_duration//2 extra
  frames, so blended latent artifacts are no longer visible outside
  the fade region
- Latent path: half_lat now covers blend_half_latent + extra_lat so
  the re-encode window includes the full overlap zone; half_pix uses
  the full decoded window so the VAE round-trip frames are all faded
- blend_half_latent/blend_half_pixels stored per boundary entry so
  each boundary uses the correct overlap geometry

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
digital-garbage
2026-05-26 00:42:40 +03:00
co-authored by Claude Sonnet 4.6
parent 51816254bd
commit f3fe032847
1 changed files with 13 additions and 6 deletions
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samplers.py
+13 -6
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@@ -806,8 +806,8 @@ class FunPackLTXAVSceneChainSampler:
"tooltip": "Experimental: carry protected frames from latent_template noise_mask into each continuation chunk after the overlap.",
}),
"transition_duration": ("INT", {
"default": 16, "min": 2, "max": 128, "step": 2,
"tooltip": "Pixel frames affected per visual transition (split evenly before/after each scene boundary).",
"default": 16, "min": 0, "max": 128, "step": 2,
"tooltip": "Extra pixel frames of fade beyond the blend zone on each side of a scene boundary. 0 = disable all transition effects.",
}),
},
"optional": {
@@ -1314,8 +1314,9 @@ class FunPackLTXAVSceneChainSampler:
if not active:
return decoded
frames = decoded.clone().float()
half = max(1, transition_duration // 2)
for entry in active:
blend_half = entry.get("blend_half_pixels", 1)
half = blend_half + max(0, transition_duration // 2)
self._apply_effect_on_pixels(frames, entry["effect"], int(entry["pixel_frame"]), half)
return frames.clamp(0.0, 1.0).to(dtype=decoded.dtype)
@@ -1328,11 +1329,13 @@ class FunPackLTXAVSceneChainSampler:
result_tensors = list(self._latent_tensors(output))
video_tensor = result_tensors[0].clone()
total_latent_frames = self._tensor_frames(video_tensor)
half_lat = max(2, (max(1, transition_duration // 2) + time_scale - 1) // time_scale)
for entry in active:
effect = entry["effect"]
boundary_latent = int(entry["boundary_latent"])
blend_half_lat = entry.get("blend_half_latent", 2)
extra_lat = max(0, (max(0, transition_duration // 2) + time_scale - 1) // time_scale)
half_lat = blend_half_lat + extra_lat
start_l = max(0, boundary_latent - half_lat)
end_l = min(total_latent_frames, boundary_latent + half_lat)
if start_l >= end_l:
@@ -1350,8 +1353,8 @@ class FunPackLTXAVSceneChainSampler:
decoded = decoded.reshape(b * t, h, w, c)
frames = decoded.clone().float()
half_pix = max(1, transition_duration // 2)
center = frames.shape[0] // 2
half_pix = max(1, center)
self._apply_effect_on_pixels(frames, effect, center, half_pix)
frames = frames.clamp(0.0, 1.0)
@@ -1450,13 +1453,17 @@ class FunPackLTXAVSceneChainSampler:
else:
# Record boundary (center of the overlap region) before blending
effect = self._scene_transition_effect(scene_cond)
if effect:
if effect and transition_duration > 0:
boundary_latent = max(0, cumulative_latent_frames - video_overlap // 2)
boundary_pixel = int((boundary_latent - 1) * time_scale + 1) if time_scale > 1 else boundary_latent
blend_half_latent = max(1, video_overlap // 2)
blend_half_pixels = blend_half_latent * time_scale
boundary_entries.append({
"boundary_latent": boundary_latent,
"pixel_frame": max(0, boundary_pixel),
"effect": effect,
"blend_half_latent": blend_half_latent,
"blend_half_pixels": blend_half_pixels,
})
chunk = self._build_continuation_chunk(latent_template, output, video_overlap)
if carry_i2v_guides: