I want to edit a video in MainConcept AVC/AAC Internet HD 1080p format to .MP4 format, using the Sony Vegas Pro software. When I click Render, the rendering process begins and after 10 seconds this error message appears: "An error occurred while creating the media file. The cause of the error has not been be determined.
Click on "Render As"
Select a rendering template for "Main Concept AVC/AAC" (in your case the Internet 1080 HD)
Click on "Customize"
Under "Variable Bit Rate", you shall have the "Encoding Mode" section. Click on the scroll bar, and select "Render using CPU only."