Update Frames parameter documentation across Clone-Video.md, Create-Clip.md, Get-FramesRange.md and SKILL.md to clarify range validation behavior (start-end format rejects reversed ranges and out-of-bounds ends with exit code 1, single positive numbers clamp to last frame instead of erroring), add encoder/filter prerequisites table to SKILL.md listing libx264/libx265/libvpx-vp9/libopus/libmp3lame/libaom-av1/libwebp requirements per script with task-specific check guidance using ffmpeg -encoders,

skill/Clone-Video.md

@@ -43,8 +43,8 @@ The output container is chosen from the `-Target` extension (`.mp4`, `.webm`, or
 - **`-StartFrame`** (optional): 0-based frame index to start cloning from (default: 0). Mutually exclusive with `-Frames`.
 - **`-EndFrame`** (optional): 0-based frame index to end cloning at, use -1 for end (default: -1). Mutually exclusive with `-Frames`.
 - **`-Frames`** (optional): 0-based frame range to clone. Mutually exclusive with `-StartFrame`, `-EndFrame`, and `-Sequence`. Supported formats:
-    - `start-end`: Clone frames from `start` to `end` (e.g., `"100-500"`)
-    - `positive_number`: Clone frames from 0 to that number (e.g., `"50"`)
+    - `start-end`: Clone frames from `start` to `end` (e.g., `"100-500"`). Both ends must lie inside the video, and `start` must not be greater than `end`. Otherwise the script stops with exit code `1`.
+    - `positive_number`: Clone frames from 0 to that number (e.g., `"50"`). A single number past the last frame is clamped to the last frame (`"150"` on a 100-frame video gives frames 0 to 99).
     - `-N`: Clone the last N frames (e.g., `"-10"` clones frames 90 to 99 of a 100-frame video; `"-1"` clones the last frame only)
     - `%`: The last frame index. Alone (`"%"`) it selects only the last frame. In a range (e.g., `"10-%"`) it is the end of the range
     - `-%` is not supported and is rejected with exit code `1`