I have created a project in PP CS4, importing an MP4 clip from a Flip video camera. The dimension of the image is 1280 x 720. When I open the export dialog the dimensions are 1080 x 720, which is not 16:9. Changing the settings manually to be the same as the source, the encoder gives me an error.
I am using H.264 and have selected 16:9 widescreen for pixel aspect ratio. The output setting I am given is 720 x 480, which is not 16:9. When I unlink the dimensions to enter 1280 x 720, I get an error and the file won't render.
What am I missing?