Args:
    file_path: Path to the media file

Returns:
    JSON string with media metadata including duration, resolution,
    codecs, bitrate, and stream information

Args:
    file_path: Path to the input media file
    output_format: Target format (e.g., mp4, mkv, webm, mp3, wav)
    scale: Optional resolution scale (e.g., "1280:720", "1920:-1" for auto height)
    video_codec: Optional video codec (e.g., libx264, libx265, libvpx-vp9)
    audio_codec: Optional audio codec (e.g., aac, mp3, opus)

Returns:
    Path to the converted file

Args:
    file_path: Path to the input video file
    quality: Compression quality level - "low" (smallest file), "medium", or "high" (best quality)
    scale: Optional resolution scale (e.g., "1280:720", "1920:-1" for auto height)
    preset: Encoding speed preset - faster presets = larger files, slower = smaller files

Returns:
    Path to the compressed file

Args:
    file_path: Path to the input video file
    start_time: Start time (e.g., "00:01:30" or "90" for 90 seconds)
    end_time: End time (e.g., "00:02:00"). Mutually exclusive with duration.
    duration: Duration of the clip (e.g., "30" for 30 seconds). Mutually exclusive with end_time.

Returns:
    Path to the trimmed file

Args:
    file_path: Path to the input video file
    audio_format: Output audio format (mp3, aac, wav, flac, ogg, opus)
    bitrate: Audio bitrate (e.g., "128k", "192k", "320k"). If not specified, uses format default.

Returns:
    Path to the extracted audio file

Args:
    file_paths: List of paths to video files to merge (in order)
    output_path: Optional output file path. If not specified, saves to default output directory.

Returns:
    Path to the merged file

Args:
    file_path: Path to the input video file
    interval: Extract one frame every N seconds (e.g., 1.0 for one frame per second)
    count: Total number of frames to extract (evenly distributed). Mutually exclusive with interval.
    format: Output image format (jpg, png, bmp)

Returns:
    Path to the directory containing extracted frames

Args:
    file_path: Path to the input video file
    subtitle_path: Path to the subtitle file (SRT, ASS, VTT)
    style: Subtitle style - "outline" (default), "shadow", "background", or "glow"
    font_size: Font size for subtitles (default: 24)
    output_path: Optional output file path. If not specified, saves to default output directory.

Returns:
    Path to the output video with subtitles