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ltxv: relax frame_idx divisibility for single frames. (#7146)

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This commit relaxes divisibility constraint for single-frame
conditionings. For single frames, the index can be arbitrary, while
multi-frame conditionings (>= 9 frames) must still be aligned to 8
frames.

Co-authored-by: Andrew Kvochko <a.kvochko@lightricks.com>
This commit is contained in:
Andrew Kvochko 2025-03-10 10:11:48 +02:00 committed by GitHub
parent 6f8e766509
commit 67c7184b74
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1 changed files with 10 additions and 8 deletions
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comfy_extras/nodes_lt.py
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@ -99,12 +99,13 @@ class LTXVAddGuide:
"negative": ("CONDITIONING", ),
"vae": ("VAE",),
"latent": ("LATENT",),
"image": ("IMAGE", {"tooltip": "Image or video to condition the latent video on. Must be 8*n + 1 frames." \
"image": ("IMAGE", {"tooltip": "Image or video to condition the latent video on. Must be 8*n + 1 frames."
"If the video is not 8*n + 1 frames, it will be cropped to the nearest 8*n + 1 frames."}),
"frame_idx": ("INT", {"default": 0, "min": -9999, "max": 9999,
"tooltip": "Frame index to start the conditioning at. Must be divisible by 8. " \
"If a frame is not divisible by 8, it will be rounded down to the nearest multiple of 8. " \
"Negative values are counted from the end of the video."}),
"tooltip": "Frame index to start the conditioning at. For single-frame images or "
"videos with 1-8 frames, any frame_idx value is acceptable. For videos with 9+ "
"frames, frame_idx must be divisible by 8, otherwise it will be rounded down to "
"the nearest multiple of 8. Negative values are counted from the end of the video."}),
"strength": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 1.0, "step": 0.01}),
}
}
@ -127,11 +128,12 @@ class LTXVAddGuide:
t = vae.encode(encode_pixels)
return encode_pixels, t
def get_latent_index(self, cond, latent_length, frame_idx, scale_factors):
def get_latent_index(self, cond, latent_length, guide_length, frame_idx, scale_factors):
time_scale_factor, _, _ = scale_factors
_, num_keyframes = get_keyframe_idxs(cond)
latent_count = latent_length - num_keyframes
frame_idx = frame_idx if frame_idx >= 0 else max((latent_count - 1) * 8 + 1 + frame_idx, 0)
frame_idx = frame_idx if frame_idx >= 0 else max((latent_count - 1) * time_scale_factor + 1 + frame_idx, 0)
if guide_length > 1:
frame_idx = frame_idx // time_scale_factor * time_scale_factor # frame index must be divisible by 8
latent_idx = (frame_idx + time_scale_factor - 1) // time_scale_factor
@ -191,7 +193,7 @@ class LTXVAddGuide:
_, _, latent_length, latent_height, latent_width = latent_image.shape
image, t = self.encode(vae, latent_width, latent_height, image, scale_factors)
frame_idx, latent_idx = self.get_latent_index(positive, latent_length, frame_idx, scale_factors)
frame_idx, latent_idx = self.get_latent_index(positive, latent_length, len(image), frame_idx, scale_factors)
assert latent_idx + t.shape[2] <= latent_length, "Conditioning frames exceed the length of the latent sequence."
num_prefix_frames = min(self._num_prefix_frames, t.shape[2])