1-Click SeedVR 2.5 — Release Notes (v1.9.55b)

Everything new since v1.9.54b.

v1.9.55b — Pre-downscale crash fix, filter selection, smarter Auto Tune

Every run with Pre-downscale enabled crashed with
ValueError: Anti-alias option is only supported for bilinear and bicubic modes — the old resize call combined mode="lanczos" with
antialias=True, a combination PyTorch does not support at all.
The downscaler now uses antialiased bicubic with a [0, 1] clamp —
PyTorch's highest-quality downscale path (matches PIL's antialiased
resize), fully float32, no uint8 quantization anywhere.

A new "Downscale filter" dropdown appears in the settings panel
whenever Pre-downscale is enabled. Eight resize kernels to choose from:
- Bicubic + Anti-alias (best) — default
- Bicubic
- Bilinear + Anti-alias / Bilinear
- Area (average) / Nearest
- Lanczos and Mitchell cubic (via OpenCV, float32 CPU — torch
  has no Lanczos kernel)
New CLI argument --downscale_filter; the choice persists in settings
and presets.
Robust by design: an unknown or stale value can never crash a run — it
silently falls back to the safe default (verified by automated tests).
All kernels were self-tested on GPU/CPU for correct shape, float32 dtype,
[0, 1] range and NaN-free output at factors 2× and 3×, plus an offscreen
GUI test (default value, selection, preset restore, visibility toggle).

Starting parameters are computed from the actual target output
dimensions (VAE working-set estimate from measured decode/encode peak
memory), instead of a fixed VRAM-tier table that ignored resolution.
Example: a 12 GB card processing 1080p output now starts at
batch=81 / tile=384 / swap=16 (~7.2 GB working set) instead of tile=512,
which silently spilled into shared memory (WDDM spills raise no OOM
error, so the retry chain never fired).
Tiling now engages whenever the tile size is smaller than the output
width or height (previously only below a fixed 1024 px, which skipped
tiling for wide frames).
The log line now reads
Auto Tune: free VRAM X GB, target W×H → batch=… tile=… swap=….

Executable is now built as 1Click_SeedVR_2.5.exe (InternalName and
OriginalFilename metadata updated to match).