feat: use python module

[azman0101]

This pull request refactors the YouTube transcript and comments retrieval logic to use the yt-dlp Python module directly, instead of invoking the command-line tool via subprocess. This change simplifies the code, improves error handling, and makes the application easier to test and maintain.

Migration to direct yt-dlp Python API:

• Replaced all uses of subprocess calls to the yt-dlp command-line tool with direct calls to the yt-dlp Python module (YoutubeDL), removing the run_yt_dlp helper and related subprocess logic. [1] [2] [3]
• Updated the fetch_comments and fetch_transcript functions to use YoutubeDL.extract_info with appropriate options for extracting comments and subtitles, improving code clarity and error handling. [1] [2]

Documentation and UI updates:

• Updated documentation and user instructions to clarify that the Python yt-dlp module is used internally, not the standalone command-line tool. [1] [2]

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
app.py	26% smaller
README.md	Unsupported file format
requirements.txt	Unsupported file format

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