DVD & Blu-ray Authoring

DVD & Blu-ray Authoring

DVD & Blu-ray Authoring

In 1997 digital video & audio technology entered people's homes around the world in the form of DVD, (Digital Versatile Discs), forever changing the home entertainment industry.

A decade later, another revolution is under way with the introduction and ever-expanding uptake of High Definition video & high-resolution audio playback in the form of Blu-ray discs. Apart from the much improved visual and audio experience, Blu-ray technology is rapidly growing in popularity because it also offers enhanced interactivity with the Internet. The live Internet connection allows Blu-ray to offer a host of additional features compared to DVDs.

DVD and Blu-ray authoring is the terminology used to describe the creation of DVDs & Blu-ray discs for use in DVD & Blu-ray players. The name "Blu-ray" is derived from the fact that a blue laser (not red) reads the discs.

Before the actual authoring process takes place the video & audio is encoded and compressed so that the images and all other information intended for the disc can fit onto a DVD or Blu-ray, and then be enjoyed as a movie. Although a dual layer DVD offers 8.5 GB of capacity, without the video data being "compressed" a standard definition movie would never fit onto a disc. For DVDs the program is encoded in an MPEG-2 format, while for Blu-rays, MPEG-4 is the most commonly used video compression codec.

Although Blu-ray discs offer up to 50 GB of space, M-PEG 4 compression for the Hi Def video is used to manipulate what would amount to a Terabyte of uncompressed video. For the audio compression on a DVD, either Dolby Digital or DTS in up to 5.1 channels of discrete surround sound is used. For Blu-ray, high-resolution sound is used with Dolby True HD or DTS Master audio in up to 7.1 channels of surround sound being the most popular choices.

While the video & audio encoding process is under way, supplied or created artwork is generated to form the interactive menu screens necessary for navigational control of the movie. On Blu-ray discs these menus are also available in pop-up' form, which display over the video program while it continues to play.

Once all video & audio assets are created, the industry standard high-end software "Scenarist" is used to author or program' the disc. Once completed, the final disc is played for a thorough quality control (QC) assessment before being mastered for DVD replication or Blu-ray replication.

The future of this exciting home entertainment technology continues to evolve with the arrival of cinema quality 3D video for Blu-ray discs.

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