diff --git a/write_metadata.py b/write_metadata.py
new file mode 100755
index 0000000..d4650b4
--- /dev/null
+++ b/write_metadata.py
@@ -0,0 +1,159 @@
+#!/usr/bin/env python3
+import argparse
+import json
+import os
+import subprocess
+import sys
+
+def read_metadata_json(json_file):
+    """
+    Read metadata from a JSON file.
+
+    Args:
+        json_file (str): Path to the JSON file
+
+    Returns:
+        dict: Metadata information
+    """
+    try:
+        with open(json_file, 'r', encoding='utf-8') as f:
+            metadata = json.load(f)
+        return metadata
+    except Exception as e:
+        print(f"❌ Error reading JSON file: {str(e)}")
+        return None
+
+def write_metadata_to_video(metadata, input_file, output_file=None):
+    """
+    Write metadata to a video file using mkvmerge.
+
+    Args:
+        metadata (dict): Metadata information
+        input_file (str): Path to the input video file
+        output_file (str, optional): Path to the output video file
+
+    Returns:
+        bool: True if successful, False otherwise
+    """
+    if not os.path.isfile(input_file):
+        print(f"❌ Input file not found: {input_file}")
+        return False
+
+    if not output_file:
+        # Create a temporary output file
+        base_name, ext = os.path.splitext(input_file)
+        output_file = f"{base_name}_modified{ext}"
+
+    # Start building the mkvmerge command
+    cmd = ["mkvmerge", "-o", output_file]
+
+    # Add global metadata (title)
+    if "title" in metadata:
+        cmd.extend(["--title", metadata["title"]])
+
+    # Process audio tracks
+    for i, track in enumerate(metadata.get("audio_tracks", [])):
+        track_id = i + 1  # mkvmerge track IDs start from 0 for video, 1 for first audio
+
+        # Set language
+        if "language" in track:
+            cmd.extend([f"--language", f"{track_id}:{track['language']}"])
+
+        # Set title/name
+        if "name" in track and track["name"]:
+            cmd.extend([f"--track-name", f"{track_id}:{track['name']}"])
+
+        # Set disposition flags
+        flags = track.get("flags", {})
+
+        if flags.get("default", False):
+            cmd.extend([f"--default-track", f"{track_id}:yes"])
+        else:
+            cmd.extend([f"--default-track", f"{track_id}:no"])
+
+        if flags.get("forced", False):
+            cmd.extend([f"--forced-track", f"{track_id}:yes"])
+        else:
+            cmd.extend([f"--forced-track", f"{track_id}:no"])
+
+        if flags.get("original", False):
+            cmd.extend([f"--original-flag", f"{track_id}:yes"])
+        else:
+            cmd.extend([f"--original-flag", f"{track_id}:no"])
+
+    # Process subtitle tracks
+    for i, track in enumerate(metadata.get("subtitle_tracks", [])):
+        # Calculate track ID (assuming all audio tracks come before subtitle tracks)
+        track_id = len(metadata.get("audio_tracks", [])) + i + 1
+
+        # Set language
+        if "language" in track:
+            cmd.extend([f"--language", f"{track_id}:{track['language']}"])
+
+        # Set title/name
+        if "name" in track and track["name"]:
+            cmd.extend([f"--track-name", f"{track_id}:{track['name']}"])
+
+        # Set disposition flags
+        flags = track.get("flags", {})
+
+        if flags.get("default", False):
+            cmd.extend([f"--default-track", f"{track_id}:yes"])
+        else:
+            cmd.extend([f"--default-track", f"{track_id}:no"])
+
+        if flags.get("forced", False):
+            cmd.extend([f"--forced-track", f"{track_id}:yes"])
+        else:
+            cmd.extend([f"--forced-track", f"{track_id}:no"])
+
+    # Add input file
+    cmd.append(input_file)
+
+    # Execute the mkvmerge command
+    print(f"🔄 Writing metadata to {os.path.basename(output_file)}")
+    print(f"Command: {' '.join(cmd)}")
+
+    try:
+        result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
+        if result.returncode != 0:
+            print(f"❌ Error writing metadata: {result.stderr}")
+            return False
+
+        print(f"✅ Metadata written to {output_file}")
+        return True
+    except Exception as e:
+        print(f"❌ Error executing mkvmerge: {str(e)}")
+        return False
+
+def main():
+    parser = argparse.ArgumentParser(description="Write metadata from JSON to video file.")
+    parser.add_argument("json_file", help="Path to input JSON metadata file")
+    parser.add_argument("video_file", help="Path to input video file")
+    parser.add_argument("-o", "--output", help="Path to output video file")
+    args = parser.parse_args()
+
+    json_file = args.json_file
+    video_file = args.video_file
+    output_file = args.output
+
+    if not os.path.isfile(json_file):
+        print(f"❌ JSON file not found: {json_file}")
+        sys.exit(1)
+
+    if not os.path.isfile(video_file):
+        print(f"❌ Video file not found: {video_file}")
+        sys.exit(1)
+
+    # Read metadata from JSON
+    metadata = read_metadata_json(json_file)
+    if not metadata:
+        sys.exit(1)
+
+    # Write metadata to video
+    success = write_metadata_to_video(metadata, video_file, output_file)
+    if not success:
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()