FFmpeg is not installed on this system.

FFmpeg is required for video conversion.
All video encoding will fail without FFmpeg.
Your resolution options are listed below.

1. Install FFmpeg  
2. Get a host that has FFmpeg pre-installed & fully functional  
3. Hire a professional to install FFmpeg  
4. Encode with ClipBucket Desktop Uploader  
5. Encode via videnc.com Video Encoding Service  
6. Encode via Hey!Watch Video Encoding Service