Gebruiker:Andries/Vergelijking tussen optische diskformaten

In 2006, the release of two next-generation optical disc formats attempted to improve upon and eventually replace the DVD standard. The two formats, HD DVD and Blu-ray Disc, are currently in a format war. This article compares their respective technologies, business alliances, hardware support, and sales.

There are two other high-definition optical disc formats : the multi-layered red-laser Versatile Multilayer Disc and a Chinese variant of HD DVD known as CH-DVD. Deze hebben in het februari 2008 (nog) geen aanwezigheid in Nederland of België.

Technische details

A Tabel Vergelijking tssen Hoge-defintion opticsche mediaformaten
Inclusief DVD ter vergelijking
Mandatory codecs must be supported by the player. Each disc must use one or more of the mandatory codecs.

			Blu-ray Disc	HD DVD	DVD
Laser wavelength			405 nm (blue-violet laser)		650 nm (red laser)
Numerical aperture			0.85	0.65	0.6
Storage capacity (single side)		per layer/maximum	25/50 GB [a]	15/30 GB [a]	4.7/8.5 GB
Maximum bitrate	Raw data transfer		53.95 Mbit/s	36.55 Mbit/s	11.08 Mbit/s
	Audio+Video+Subtitles		48.0 Mbit/s	30.24 Mbit/s	10.08 Mbit/s
	Video		40.0 Mbit/s	29.4 Mbit/s	9.8 Mbit/s
Mandatory video codecs			H.264/MPEG-4 AVC / VC-1 / MPEG-2		MPEG-1 / MPEG-2
Audio codecs	lossy	Dolby Digital	Mandatory @ 640 Kbit/s	Mandatory @ 448 Kbit/s	Mandatory @ 448 Kbit/s
		DTS	Mandatory @ 1.5 Mbit/s		Optional @ 1.5 Mbit/s
		Dolby Digital Plus [d]	Optional @ 1.7 Mbit/s	Mandatory @ 3.0 Mbit/s	N/A
		DTS-HD High Resolution	Optional @ 6.0 Mbit/s	Optional @ 3.0 Mbit/s	N/A
	lossless	Linear PCM	Mandatory
		Dolby TrueHD	Optional	Mandatory [b]	N/A
		DTS-HD Master Audio	Optional		N/A
Secondary video decoder (PiP)			Mandatory for Bonus View players [c]	Mandatory	N/A
Secondary audio decoder			Mandatory for Bonus View players [c]	Mandatory	Optional
Interactivity			BDMV and Blu-ray Disc Java	Standard Content and Advanced Content	Rudimentary
Internet support			Mandatory for BD-Live players	Mandatory	N/A
Video resolution (maximum)			1920×1080		720×480 (NTSC), 720×576 (PAL)
Frame rates			24/25/30p, 50/60i	24/25/30p, 50/60i	50/60i [e]
Digital Rights Management			AACS-128bit / BD+ / ROM-Mark	AACS-128bit	CSS 40-bit
Region codes			3 Regions [f]	Region free	6 Regions
Hardcoating of disc			Mandatory	Optional

• a These maximum storage capacities apply to currently released media as of February 2008. The DVD Forum has approved a triple-layer version of HD-DVD that would have a capacity of up to 51 GB, and Hitachi has proposed a modified Blu-Ray version that would support a capacity of up to 100 GB. Both format modifications are intended to maintain compatibility with existing players, requiring no more than a firmware upgrade. However, neither has yet been mass-produced or released.
• b All HD DVD players are required to decode the two primary channels (left and right) of any Dolby TrueHD track, however every HD DVD player released thus far decodes 5.1 channels of TrueHD.
• c On November 1 2007 Secondary video and audio decoder became mandatory for new Blu-ray Disc players when the Bonus View requirement came into effect. However players introduced to the market before this date can continue to be sold without Bonus View.
• d There are some differences in the implementation of Dolby Digital Plus (DD+) on the two formats. On Blu-ray Disc, DD+ can only be used to extend a primary Dolby Digital (DD) 5.1 audiotrack. In this method 640 Kbit/s is allocated to the primary DD 5.1 audiotrack (which is independently playable on players that do not support DD+), and up to 1 Mbit/s is allocated for the DD+ extension. The DD+ extension is used to replace the rear channels of the DD track with higher fidelity versions, along with adding additional channels for 6.1/7.1 audiotracks. On HD DVD, DD+ is used to encode all channels (up to 7.1), and no legacy DD track is required since all HD DVD players are required to decode DD+.
• e On PAL DVDs, 24 frame per second content is stored as 48 interlaced fields and gets replayed 4% faster, this process can be reversed to retrieve the original 24 frame per second content. On NTSC DVDs, 24 frame per second content is stored as 60 interlaced fields per second using a process called 3:2 pulldown, which if done properly can also be reversed.
• f As of December 2007, about 68% of Blu-ray discs are region-free and 32% use region codes.

Typ	Wellenlänge in nm / Durchmesser des Laserspots in µm / Numerische Apertur	Grafische Darstellung des Laserspots	Schnittzeichnung der Strahlgeometrie
CD	780 / 2,1 / 0,45	100px	300px
DVD	650 / 1,3 / 0,6	100px	300px
Blu-ray	400 / 0,6 / 0,85	100px	300px