refactor: update translation script to support generic audio stream U…

[thorwebdev]

…RLs instead of YouTube-specific extraction

[gemini-code-assist]

Code Review

This pull request refactors the real-time translation CLI tool to stream and translate generic remote audio URLs instead of being restricted to YouTube videos. It removes the dependency on yt_dlp and updates the command-line arguments, making the --url parameter optional with a default sample audio file. Feedback suggests wrapping the ffmpeg subprocess execution in a try-except block to gracefully handle cases where ffmpeg is not installed on the user's system, preventing a cryptic crash.

[gemini-code-assist]

If ffmpeg is not installed on the user's system, asyncio.create_subprocess_exec will raise a FileNotFoundError (or OSError), which will propagate and crash the application with a cryptic error message.

To improve the user experience, consider wrapping the subprocess creation in a try-except block and raising a more descriptive RuntimeError that guides the user to install ffmpeg.

For example:

try:
    process = await asyncio.create_subprocess_exec(
        'ffmpeg',
        '-i', url,
        '-f', 's16le',
        '-acodec', 'pcm_s16le',
        '-ar', str(SEND_SAMPLE_RATE),
        '-ac', str(CHANNELS),
        '-',
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.DEVNULL
    )
except OSError as e:
    raise RuntimeError(
        f"Failed to start ffmpeg ({e}). Please ensure ffmpeg is installed and available in your PATH."
    )