You can embed your stereo sound mix in one or more selected video files without re-rendering them. This is not only safer, but also quicker.
Prerequisite
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Your project contains one or more video events and you have arranged and mixed the audio to a stereo output bus.
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The video files are compressed using the H.264 codec in the .mp4 or .mov container format.
Procedure
Result
The original video files are copied to the specified location, and an audio mixdown of the selected stereo output bus is embedded into the files.
If you trimmed the lengths of the video events in your project, the resulting video files are longer than the video events in the project. As a result, they contain silent portions.
The resulting video files are MP4 files. The embedded audio is compressed using an AAC LC encoder with 192 kbps at a constant bit rate.