fix: enhance 2-pass x265 encoding to copy compatible HEVC video below specified bitrate limit

README.md

@@ -223,7 +223,7 @@ OCR failures are logged as **warnings** without stopping the pipeline.
 
 Performs 2-pass libx265 encoding using VBV parameters from `args.variables`.
 
-- **Video**: bound-1080p Lanczos scaling (no letterbox, even dimensions)
+- **Video**: HEVC already within 1080p and strictly below 3000 kbps is copied; all other video is bound-1080p Lanczos scaled and x265-encoded (no letterbox, even dimensions)
 - **Audio**: Opus re-encode with per-track indexed bitrate (ITA default, ENG secondary)
 - **Subtitles**: stripped (`-sn`)
 - **Chapters**: preserved (`-map_chapters 0`)
@@ -233,6 +233,7 @@ Performs 2-pass libx265 encoding using VBV parameters from `args.variables`.
 |---|---|---|
 | `x265Preset` | `slow` | x265 preset (`ultrafast` … `veryslow`). Slower = better quality. |
 | `outputContainer` | `mkv` | Output file extension |
+| `copyHevcBelowKbps` | `3000` | Copy compatible HEVC video below this bitrate instead of re-encoding it. `0` disables copying. |
 
 **Outputs**: `1` → transcode complete