MP4 Aspect Ratio Adjustment for Facebook

I need an existing MP4 video modified to fit two new aspect ratios: 9:16 and 1:1. The purpose of these modifications is to prepare the video for a social media post on Facebook.

Ideal Skills:
- Video Editing
- Familiarity with Facebook Video Standards
- Understanding of Aspect Ratio Implications on Video Quality and Composition

Please note, the edited video should maintain its visual and audio quality post-edit.