Blue-ray PDF

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What is Blue-ray?

Blu-ray, also commonly known as Blu-ray Disc, is a next-generation optical disc format.  This format was developed to enable the recording, rewriting and playback of high-definition video (HD), in addition to storing large amounts of data.  The Blu-ray name is derived from the blue-violet laser used to read and write data to and from the disc.  The letter “e” was intentionally left off so the term “Blu-ray” so the term could be registered as a trademark.

What video codecs will Blu-ray support?

Blu-ray discs support MPEG-2 - enhanced for HD, also used for playback ofDVDs and HDTV recordings; MPEG-4 AVC - part of the MPEG-4 standard also known as H.264 (High Profile and Main Profile); SMPTE VC-1 - standard based on Microsoft's Windows Media Video (WMV) technology.

How much video can you fit on a Blu-ray disc ?

The Blu-ray optical disc format stores up to 25GB on a single-layer disc (BD-25) and up to 50GB (BD-50) on a dual-layer disc; translating to approximately 9 hours of high-definition (HD) video on a 50GB disc and 23 hours of standard-definition (SD) video on a 50GB disc.

What audio codecs will Blu-ray support?

  • Blu-ray audio codec: Linear PCM (LPCM) - up to 8 channels of uncompressed audio. (mandatory)
  • Blu-ray audio codec: Linear PCM (LPCM) - up to 8 channels of uncompressed audio. (mandatory)
  • Blu-ray audio codec: Dolby Digital (DD) - format used forDVDs, 5.1-channel surround sound. (mandatory)
  • Blu-ray audio codec: Dolby Digital Plus (DD+) - extension of Dolby Digital, 7.1-channel surround sound. (optional)
  • Blu-ray audio codec: Dolby TrueHD - lossless encoding of up to 8 channels of audio. (optional)
  • Blu-ray audio codec: DTS Digital Surround - format used forDVDs, 5.1-channel surround sound. (mandatory)
  • Blu-ray audio codec: DTS-HD High Resolution Audio - extension of DTS, 7.1-channel surround sound. (optional)
  • Blu-ray audio codec: DTS-HD Master Audio - lossless encoding of up to 8 channels of audio. (optional)

 

Parameters
Blu-ray
DVD
Storage capacity 25GB (single-layer) 4.7GB (single-layer)
50GB (dual-layer) 8.5GB (dual-layer)
Laser wavelength 405nm (blue laser) 650nm (red laser)
Numerical aperture (NA) 0.85 0.6
Disc diameter 120mm 120mm
Disc thickness 1.2mm 1.2mm
Protection layer 0.1mm 0.6mm
Hard coating Yes No
Track pitch 0.32µm 0.74µm
Data transfer rate (data) 36.0Mbps (1x) 11.08Mbps (1x)
Data transfer rate (video/audio) 54.0Mbps (1.5x) 10.08Mbps (<1x)
Video resolution (max) 1920×1080 (1080p) 720×480/720×576 (480i/576i)
Video bit rate (max) 40.0Mbps 9.8Mbps
Video codecs MPEG-2 MPEG-2
MPEG-4 AVC -
SMPTE VC-1 -
Audio codecs Linear PCM Linear PCM
Dolby Digital Dolby Digital
Dolby Digital Plus DTS Digital Surround
Dolby TrueHD -
DTS Digital Surround -
DTS-HD -
Interactivity BD-J DVD-Video
 
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