chore: remove unused imports and dead code

rename_audio.py

@@ -25,7 +25,6 @@ import shutil
 import subprocess
 import sys
 import tempfile
-import numpy as np
 
 try:
     import whisper
@@ -195,41 +194,6 @@ def get_lang_name(code: str) -> str:
     return LANG_NAMES.get(code, code.upper())
 
 
-def apply_metadata(file_path: str, stream_idx: int, lang_code_3: str,
-                   title: str, dry_run: bool = True) -> str:
-    """
-    Apply language metadata to a specific audio stream.
-    Returns the ffmpeg command (for display) or runs it.
-    """
-    # Use 3-letter ISO 639-2/B code for MKV
-    meta_key = f"metadata:s:a:{stream_idx}"
-
-    cmd = [
-        "ffmpeg", "-y",
-        "-i", file_path,
-        "-map", "0",
-        "-c", "copy",
-        f"{meta_key}:language={lang_code_3}",
-        f"{meta_key}:title={title}",
-    ]
-
-    if dry_run:
-        return " ".join(cmd)
-
-    # Write to temp file, then replace
-    base, ext = os.path.splitext(file_path)
-    tmp_out = f"{tmp_out_base}{ext}"
-    cmd.append(tmp_out)
-
-    r = subprocess.run(cmd, capture_output=True, timeout=300)
-    if r.returncode != 0:
-        print(f"  ERROR: ffmpeg metadata failed: {r.stderr.decode()[-200:]}", file=sys.stderr)
-        return ""
-
-    # Replace original
-    shutil.move(tmp_out, file_path)
-    return file_path
-
 
 def main():
     ap = argparse.ArgumentParser(description="Detect audio languages via Whisper and set MKV metadata")