fix: Ausgabedateinamen vereinheitlichen – Titel ohne Unterstriche

safe_output_stem und get_pvd_filename nutzten unterschiedliche Logik,
sodass MP4 und MOV-Dateien inkonsistente Titel hatten. Neue gemeinsame
Funktion extract_title stellt sicher, dass alle drei Ausgabedateien
denselben Titel ohne Unterstriche verwenden.

README und CLAUDE.md aktualisiert.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,110 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What This Project Does
+
+Amazon PVD Mezzanine Encoder — a Windows tool that creates Amazon-compatible mezzanine files from video sources (ProRes, Blu-ray, DVD, etc.). Produces three output files:
+1. `*_PVD.mp4` — H.264 with German stereo AAC audio
+2. `*_DEU_AUDIO_PCM.mov` — All German audio tracks as uncompressed PCM
+3. `*_OV_AUDIO_PCM.mov` — All non-German audio tracks as uncompressed PCM (if present)
+
+## Running
+
+```powershell
+# Drag-and-drop or batch launcher (recommended for end users)
+.\create_mezzanine.bat "D:\path\to\video.mov"
+
+# Direct Python
+python .\pvd_mezzanine.py "D:\path\to\video.mov"
+
+# CLI-only mode (no GUI)
+python .\pvd_mezzanine.py --cli "D:\path\to\video.mov"
+```
+
+No build step. Pure Python 3.10+ with no third-party dependencies. Requires FFmpeg/FFprobe (auto-detected from PATH, `C:\Tools\FFMPEG`, `C:\Software`, or configured in `config.ini`).
+
+## Architecture
+
+All logic lives in `pvd_mezzanine.py`. The data flows in one direction:
+
+```
+User Input → config.ini → FFprobe (probe_metadata) → Analysis (analyze_video / build_audio_roles) → JobPlan (build_plan) → FFmpeg commands → run_plan → Output files
+```
+
+### Key Dataclasses
+
+**`AudioRole`** — One audio track: stream index, language, channels, codec. `is_german` checks `{DEU, GER}`. `effective_channels` prefers filename-token over FFprobe-detected channels.
+
+**`VideoProfile`** — Video analysis result: resolution, FPS, SD/HD, NTSC/PAL, interlacing, colorspace metadata, conversion flags.
+
+**`JobPlan`** — Complete encoding spec: input/output paths, selected audio roles for MP4 and MOVs, video profile, generated FFmpeg command strings.
+
+### Module Sections (by line range)
+
+| Lines | Responsibility |
+|-------|----------------|
+| 27–180 | Config loading (`config.ini`), FFmpeg path detection, output directory resolution |
+| 301–431 | `probe_metadata()`, `analyze_video()`, `build_audio_roles()`, `parse_audio_tokens()` |
+| 449–625 | `build_plan()` orchestration, `build_pvd_mp4_command()`, `build_audio_mov_command()`, `build_video_filters()` |
+| 628–691 | `run_command()` (subprocess streaming), `run_plan()`, `run_cli()` |
+| 693–871 | `MezzanineApp` — Tkinter GUI with threaded encoding |
+| 873–935 | `main()`, `run_ui()`, `run_no_tk_fallback()`, `choose_input_with_powershell()` |
+
+### Audio Detection Logic
+
+Filename tokens take priority over FFprobe stream metadata. Format: 3-letter language code + channel spec — e.g., `Film_DEU51_ENG20.mov` → Stream 0 = German 5.1, Stream 1 = English 2.0. Token order maps to stream order.
+
+MP4 audio selection: prefer German stereo → any German track (FFmpeg downmixes) → error if none found.
+
+### Video Processing Rules
+
+- SD (height ≤ 576): 8M bitrate, H.264 level 3.1
+- HD (height > 576): 30M bitrate, H.264 level 4.1
+- NTSC: height ≤ 480 and FPS ≥ 29
+- Colorspace filter only applied when source has complete metadata (primaries + transfer + space); otherwise skipped to prevent FFmpeg abort
+- Deinterlace (`bwdif`) applied if interlaced source detected
+- Forced subtitles burned if `_forced.srt` exists next to the input file
+
+### UI Fallback Chain
+
+1. Tkinter GUI (full interface with progress log)
+2. PowerShell native file dialog + console output (if Tkinter unavailable)
+3. CLI mode with `--cli` flag or file argument
+
+### Output Naming
+
+Title is derived from: Blu-ray folder name (4 levels above `BDMV`) → filename stem with audio tokens stripped → `UNKNOWN_TITLE`.
+
+```
+Titel_DEU20_PVD.mp4
+Titel_DEU_AUDIO_PCM.mov
+Titel_OV_AUDIO_PCM.mov
+```
+
+## Configuration
+
+`config.ini` is auto-created on first run. Key settings:
+
+```ini
+[ffmpeg]
+search_dirs = C:\Tools\FFMPEG, C:\Software
+
+[output]
+preferred_dirs = F:\VOD, H:\VOD   # first existing dir is used
+
+[video]
+hd_bitrate = 30M
+sd_bitrate = 8M
+preset = slow
+tune = film
+
+[audio]
+mp4_bitrate = 256k
+pcm_codec = pcm_s24le
+sample_rate = 48000
+```
+
+## Language
+
+Code comments, UI strings, and log messages are in German — maintain this convention when adding new messages or comments.