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+# AAC to E-AC-3 Converter
+
+Converts AAC 5.1/7.1 audio tracks to E-AC-3 while preserving all other streams (video, subtitles, metadata).
+
+## Requirements
+
+- Python 3.6+
+- FFmpeg with E-AC-3 support
+
+## Usage
+
+```bash
+# Preview conversions (recommended first step)
+python aac2eac.py /path/to/media --dry-run
+
+# Convert to new files (original.eac.mkv)
+python aac2eac.py /path/to/media
+
+# Overwrite original files (creates temporary backups)
+python aac2eac.py /path/to/media --overwrite
+
+# Custom FFmpeg path
+python aac2eac.py /path/to/media --ffmpeg /usr/local/bin/ffmpeg
+```
+
+## Options
+
+- `path` - Directory containing .mkv/.mp4 files (searches recursively)
+- `--dry-run` - Show what would be converted without making changes
+- `--overwrite` - Replace original files instead of creating new ones
+- `--ffmpeg` - Path to FFmpeg binary (default: `ffmpeg`)
+
+## What it does
+
+- Scans directory for .mkv and .mp4 files
+- Identifies AAC audio tracks with 6 channels (5.1) or 8 channels (7.1)
+- Converts those tracks to E-AC-3:
+  - 5.1 → 640 kbps
+  - 7.1 → 1024 kbps
+- Copies all other streams unchanged (video, subtitles, other audio)
+- Preserves all metadata
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diff --git a/main.py b/aac2eac.py
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