We can add additional/alternate language tracks or director’s commentaries to your DVD or Blu-ray project. DVDs and Blu-rays can only play 1 audio track at a time meaning they cannot mix 2 or more tracks together on playback. Each track must be self-contained and mixed accordingly. If the feature audio is to be included with the commentary then they must be mixed together into 1 track before submitting for authoring. Audio length must match program length to retain sync or a countdown and sync mark must be provided. Audio should be 16 bit 48k. We can accept higher bitrates if desired.