Potential fix for code scanning alert no. 2: Uncontrolled command line

[cwlacewe]

Potential fix for https://github.com/IntelLabs/Video-Curation-Sample/security/code-scanning/2

To fix this without changing intended functionality, enforce strict filename validation in video/utils.py and ensure ffprobe treats the input as a positional argument, not an option, in video/info.py.

Best concrete fix:

1. Repair and harden validate_video_name in video/utils.py:
   • Ensure path separators are rejected with an actual raise.
   • Reject names starting with . (already intended).
   • Reject names starting with - to prevent option injection.
   • Keep allowlist regex.
   • Remove duplicated unreachable raise.
2. Add -- before the input path in ffprobe command construction in video/info.py so option parsing is explicitly terminated before the user-influenced path.

Files/regions to change:

• video/utils.py: validate_video_name function block.
• video/info.py: cmd list in _get_info.

No new imports or dependencies are required.

Suggested fixes powered by Copilot Autofix. Review carefully before merging.