Why don't you see BD with Dolby Digital +

[Wesco]

Why don't you see the Dolby Digital + Audio format on Blu-ray Disc like with you did with HD-DVD. Anyone know why?

[kpkelley]

Originally Posted by Wesco

Why don't you see the Dolby Digital + Audio format on Blu-ray Disc like with you did with HD-DVD. Anyone know why?

Because they use TrueHD instead.

[ranma]

We got some BD with DD only.

[fettastic]

DD+ was designed specifically for HD DVD because of their limited spec. It has to do with how audio packets are delivered to the receiver, I don't remember the details.

You will never see DD+ on Blu-ray. It died with HD DVD.

[steve_dave]

Originally Posted by fettastic

DD+ was designed specifically for HD DVD because of their limited spec. It has to do with how audio packets are delivered to the receiver, I don't remember the details.

You will never see DD+ on Blu-ray. It died with HD DVD.

The PS3 was designed to support Dolby Digital Plus as were many of the first generation Blu-ray Players. It was never designed for HD DVD.

[Josh]

The DVD spec limits Dolby Digital bitrate to 448kbsp

The BD spec increases that limit to 640kbps, a bit rate that Warner believes captures most of the audible data.

The HD DVD spec keeps the DVD limit of 448kbps. So, for Warner to use the 640kbps they love without going lossless (which is variable bitrate), they needed to use Dolby Digital Plus.

For all Warner titles, bit rate for both DD on Blu-ray and DD+ on HD DVD is the same. Universal used 768kbps (I believe) DD+ on their releases, but they are using DTS-HD Master Audio lossless on Blu-ray - which is infinitely better (IMHO).

I believe there are some Blu-ray titles that use DD+, but not many.

[Alan Gordon]

Originally Posted by Josh

Universal used 768kbps (I believe) DD+ on their releases, but they are using DTS-HD Master Audio lossless on Blu-ray - which is infinitely better (IMHO).

They released one or two titles with 768kbps DD+ ("Slither" was one if I remember correctly), but the majority of Universal's DD+ soundtracks were 1.5mbps like Paramount/DreamWorks.

~Alan

[fettastic]

Originally Posted by Josh

The DVD spec limits Dolby Digital bitrate to 448kbsp

The BD spec increases that limit to 640kbps, a bit rate that Warner believes captures most of the audible data.

The HD DVD spec keeps the DVD limit of 448kbps. So, for Warner to use the 640kbps they love without going lossless (which is variable bitrate), they needed to use Dolby Digital Plus.

For all Warner titles, bit rate for both DD on Blu-ray and DD+ on HD DVD is the same. Universal used 768kbps (I believe) DD+ on their releases, but they are using DTS-HD Master Audio lossless on Blu-ray - which is infinitely better (IMHO).

I believe there are some Blu-ray titles that use DD+, but not many.

There you go. I didn't know there were any BD titles with DD+.

[Hypertrophy]

Originally Posted by Wesco

Why don't you see the Dolby Digital + Audio format on Blu-ray Disc like with you did with HD-DVD. Anyone know why?

Those consumers interested in high def video also want lossless audio formats such as DTS-MA, etc. Personally, I will not buy a blu-ray unless it has DTSMA, DOLBYTRUE, or a good PCM.

[steve_dave]

Dolby Digital Plus is an optional sound format for Blu-ray. That means that if they include DD Plus, they also have to include Dolby Digital.

For HD DVD, DD Plus was made part of the mandatory specs so that was the only track needed.

Companies like Warner only used 640kbs audio for both the DD and DD Plus tracks so including both on Blu-ray would be redundant. Paramount and Universal were the only ones who used the DD Plus max bit rate of 1.5mbs on HD DVD.

It just makes more sense to include a Dolby TrueHD track that is lossless and then a backup DD lossy track.