[Jericho Achas]

Figured it out. I am using Vegas Pro 13 and I think this would help though it works for me. First I rendered my 1080×720 pixels video to mp4 and I can see the black bars on the preview so I canceled the process, and then I rendered it again but this time I checked the Adjust frame rate box on the render options, then I started rendering. On the preview, it doesn’t show black bars yet I’m not really sure what that ‘adjust frame rate’ do so I still canceled the process. Finally, I rendered it normally without checking the ‘Adjust frame rate’ box then I started rendering, it’s not showing black bars and oh it works! no more black bars without stretching the image! It worked on me, I hope yours too. 🙂