Fix -Frames negative range calculation to extract last N frames correctly (off-by-one error), add validation to reject invalid '-%' and '-0' formats with exit code 1, change '%' alone to extract single last frame instead of range, remove duplicate last frame from PNG sequence concat list, update Get-LastFrame.ps1 and Get-Frame.ps1 to clamp out-of-range frame indices instead of erroring and improve error messages with inline stderr output, add -y flag and -- separator to ffprobe calls, replace deprecated

skill/Create-Scenes.md

@@ -31,14 +31,14 @@ Refer to [Clone-Video.ps1](Clone-Video.md) for a full description of the encodin
 Example scene list for a video with two hard cuts at frames 30 and 60:
 
 ```text
-Index StartFrame EndFrame Frames StartTime EndTime Suffix
------ ---------- -------- ------ --------- ------- ------
-    1          0       29     30      0.00    0.97 -Scene-01
-    2         30       59     30      1.00    1.97 -Scene-02
-    3         60       89     30      2.00    2.97 -Scene-03
+Index StartFrame EndFrame Frames StartTime EndTime TotalTime Suffix
+----- ---------- -------- ------ --------- ------- --------- ------
+    1          0       29     30      0.00    0.97      1.00 -Scene-01
+    2         30       59     30      1.00    1.97      1.00 -Scene-02
+    3         60       89     30      2.00    2.97      1.00 -Scene-03
 ```
 
-`StartTime` and `EndTime` are in seconds, computed as frame index divided by frame rate.
+`StartTime` and `EndTime` are in seconds, computed as frame index divided by frame rate. `EndTime` is the time of the last frame of the scene, so it is one frame before the next scene starts. `TotalTime` is the scene's duration in seconds: `Frames` divided by frame rate.
 
 ## Scene Threshold