Change NCNN_GPU_ID=-1 handling in Clone-Image.ps1 to omit upscayl-bin -g flag instead of passing -1 (which the tested build rejects), update documentation across Clone-Image.md, SKILL.md, README.md and index.md to clarify -1 means CPU for rife-ncnn-vulkan but default device for upscayl-bin, wrap Get-SrtContent calls in Create-FullSubtitle.ps1 with @() array operator to ensure Count property exists when parsing returns single entry, fix Get-FramesRange.ps1 output directory resolution to use Resolve-Path before

README.md

@@ -32,7 +32,7 @@ This environment variable must be set for both `rife-ncnn-vulkan` and `upscayl-b
 The value stored in **NCNN_GPU_ID** will be either:
 
 - **`0`** — use the first Vulkan-capable GPU (device index 0). If you have multiple GPUs, they'd be `0`, `1`, `2`, etc.
-- **`-1`** — use CPU only (no Vulkan GPU is available).
+- **`-1`** — use CPU only for `rife-ncnn-vulkan` (no Vulkan GPU is available). `upscayl-bin` rejects `-g -1` on the tested build, so the scripts omit its `-g` flag for `-1`, and it then uses its default device.
 
 These map directly to the `-g` flag values accepted by both `rife-ncnn-vulkan` and `upscayl-bin`:
 
@@ -41,7 +41,7 @@ These map directly to the `-g` flag values accepted by both `rife-ncnn-vulkan` a
 | `0` | First GPU |
 | `1` | Second GPU |
 | `2` | Third GPU |
-| `-1` | CPU |
+| `-1` | CPU for `rife-ncnn-vulkan`; no `-g` flag for `upscayl-bin` (its default device) |
 
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