Changes around underlying process killing

[carlreid]

Description

I don't believe the underlying FFMPEG process is being stopped correctly, causing some stream counting to go out of whack.

Issues (Fixed or Closed)

• Fixes #(issue number)
• Related to #(issue number)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Testing Instructions

• Steps to reproduce/test the changes
• Expected behavior

Visual Changes

• Screenshots/videos attached

Dependencies

• New dependencies added
• System requirements changed

Checklist

• I have followed the Conventional Commits naming convention
• My branch is up to date with the main branch (rebased)
• My code follows the style guidelines and existing patterns of this project
• I have performed a self-review of my own code
• I have commented complex logic
• I have added tests (if applicable)
• All tests are passing
• I have updated documentation as needed