Add temporal_downscale_ratio to LatentFormat (CORE-147)

[drozbay]

Symmetric counterpart to the existing LatentFormat.spacial_downscale_ratio. Default 1, overridden on video formats with their VAE temporal factor (Mochi 6, LTXV 8, HunyuanVideo / HunyuanVideo15 / Wan21 / CogVideoX 4, Cosmos1CV8x8x8 8; LTXAV and Wan22 inherit). Each value verified against the corresponding VAE's upscale_index_formula in comfy/sd.py.

Metadata-only, no behavior change. Lets code that has a model but no VAE in scope read model.model.latent_format.temporal_downscale_ratio directly, mirroring how spacial_downscale_ratio is already used at comfy/sample.py:48-49.

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• comfy/latent_formats.py

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📝 Walkthrough

Walkthrough

The change introduces a temporal_downscale_ratio class attribute to the latent format classes. A base value of 1 is defined on the LatentFormat class, and this attribute is overridden with format-specific values in seven video-capable latent format implementations. The values assigned range from 4 to 8 depending on the format, with most video formats using either 4 or 8.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a temporal_downscale_ratio attribute to LatentFormat with a reference to the issue (CORE-147).
Description check	✅ Passed	The description is directly related to the changeset, explaining the purpose, default values, and specific overrides for each video format class, as well as the verification methodology.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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