Re: Change Pixel Aspect Ratio Once Already Started?

You need to be sure your sequence setting matches

the frame size and aspect ratio of your source media.

To create a sequence that matches your footage, try this:

Once you have created a properly configured sequence,

you can copy (Ctrl+C) then paste (Ctrl+V) your already edited

clips into the newly created sequence.

Also:

Changing a Sequence to Match a Clip

http://www.video2brain.com/en/lessons/changing-a-sequence-to-match-a-c lip

Create a sequence

http://help.adobe.com/en_US/premierepro/cs/using/WS3E67AF4C-B2A2-4f04- 90B4-F8CCFB74B144.html#WSd79b3ca3b623cac941d41a681247d1f35a4-7fff

What's the best export format or codec?

http://www.video2brain.com/en/lessons/whats-the-best-export-format-or- codec