Where's the Dolby 5.1 TVNZ?

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546 posts

Ultimate Geek
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Reply # 495510 19-Jul-2011 23:37

richms:
hdinsider:
Back on topic though... Who knows when TVNZ are going to flick the AC3 switch? They've got the "upmixed" surround happening for non-Dolby content in house already. Yes, that's right, stereo content will be made into surround!

You say that like it is a good thing?

Not my cup of meat either!

Have heard it though and it doesn't sound too bad. Better than a home amp does it, that's for real.

Hope the advertisers like it, or there'll be many tears and furrowed brows!

don't mess with me.... i'm the hd insider....

ilovemusic

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Reply # 495511 19-Jul-2011 23:44

hdinsider:
grolschie: re: 2.35:1 ratio, black bars, etc

This is worth reading:
http://www.highdefdigest.com/news/show/764

This article is great, thanks, sums it all up really well!
Who would have thought that "The Godfather" was shot 16:9 (well approximately)?

I don't mind black bars, but as long as I don't miss the action, I'm happy with the frame being filled.

The Godfather was actually shot full frame, 1.33:1.

It was then matted to 1.85/1.78:1 for cinema/home video.

http://www.thegodfathertrilogy.com/widescreen.html

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ilovemusic

1150 posts

Uber Geek
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Reply # 495518 19-Jul-2011 23:51

grolschie: My preference would be switching between DD 2.0 for stereo content and DD 5.1 for surround material. That way home theatre users can decide whether to apply Dolby Pro Logic, DTS Neo 6, etc, or not.

Agreed.

A lot of 2 channel material has surround information encoded out of phase (L-R) that can be recovered with matrix decoding but is out of reach when forced 5.1 is used.

tehconz

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Geek
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Reply # 496445 21-Jul-2011 21:56

5.1 on DTT is on the way, it will never be on DTH, pics look bad enough already :). This was supposed to be completed some months ago but engineering resources ended up being diverted elsewhere. It is now finally being worked on, though I'm not actively involved in the project so I don't know how long its expected to take. Hopefully within the next month or so, definitely before RWC.

The dolby track will be 5.1 all the time, with a pseudo 5.1 generated from 2 channel material when real 5.1 is not available. The audio processor will use pro logic etc if present in source to generate the 5.1. Of course you can also switch back to AAC 2.0 which will still have the existing matrix encoding. It is likely there will be minimal compression and leveling in the 5.1 stream, with metadata instructing the decoder how to handle dynamic range etc depending on the user's speaker setup (home theatre, TV speakers, 2ch mixdown).

I hope TV3 does go HD for news, TVNZ certainly isn't going to jump first considering the costs involved in upgrading the studio and edit facilities. TV3's financial picture is not looking that good at the moment so it would be a pretty gutsy move on their part.

ilovemusic

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Reply # 496740 22-Jul-2011 14:34

That all appears good.

Hopefully TVNZ will broadcast DD at a level similar to TV3's.

Thanks Mr tehconz !

lchiu7

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Reply # 496784 22-Jul-2011 15:50

ilovemusic: That all appears good.

Hopefully TVNZ will broadcast DD at a level similar to TV3's.

Thanks Mr tehconz !

Actually hopefully better and broadcast all shows available in DD5.1 format in DD5.1. TV3 broadcasts some shows available in DD5.1 not even in HD (House for example).

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old3eyes

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Reply # 496813 22-Jul-2011 16:36

lchiu7:
ilovemusic: That all appears good.

Hopefully TVNZ will broadcast DD at a level similar to TV3's.

Thanks Mr tehconz !

Actually hopefully better and broadcast all shows available in DD5.1 format in DD5.1. TV3 broadcasts some shows available in DD5.1 not even in HD (House for example).

Your assuming that SD shows have DD 5.1 soundtracks..

Regards,

Old3eyes

hdinsider

546 posts

Ultimate Geek
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Reply # 496817 22-Jul-2011 16:44

old3eyes:
lchiu7:
ilovemusic: That all appears good.

Hopefully TVNZ will broadcast DD at a level similar to TV3's.

Thanks Mr tehconz !

Actually hopefully better and broadcast all shows available in DD5.1 format in DD5.1. TV3 broadcasts some shows available in DD5.1 not even in HD (House for example).

Your assuming that SD shows have DD 5.1 soundtracks..

You're right old3eyes! - House has never been DD5.1 on TV3, no SD shows on TV3 have ever been 5.1

don't mess with me.... i'm the hd insider....

lchiu7

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Reply # 496819 22-Jul-2011 16:45

No HD shows have 5.1 usually.

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mm1352000

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Reply # 496851 22-Jul-2011 17:41

tehconz: 5.1 on DTT is on the way, it will never be on DTH, pics look bad enough already :). This was supposed to be completed some months ago but engineering resources ended up being diverted elsewhere. It is now finally being worked on, though I'm not actively involved in the project so I don't know how long its expected to take. Hopefully within the next month or so, definitely before RWC.

The dolby track will be 5.1 all the time, with a pseudo 5.1 generated from 2 channel material when real 5.1 is not available. The audio processor will use pro logic etc if present in source to generate the 5.1. Of course you can also switch back to AAC 2.0 which will still have the existing matrix encoding. It is likely there will be minimal compression and leveling in the 5.1 stream, with metadata instructing the decoder how to handle dynamic range etc depending on the user's speaker setup (home theatre, TV speakers, 2ch mixdown).

I hope TV3 does go HD for news, TVNZ certainly isn't going to jump first considering the costs involved in upgrading the studio and edit facilities. TV3's financial picture is not looking that good at the moment so it would be a pretty gutsy move on their part.

Thanks for the comment tehconz!
I note that you're not actively involved in the project, however since you seem to have a reasonable knowledge of the technical details:
1. I assume that DD5.1 tracks will be added to TV One *and* TV 2 (and *not* U and TVNZ 7).
2. Do you have any idea how TVNZ plan to organise/prioritise their channel/audio/video bitrate allocations? Last time I looked, I got the impression that there wasn't too much space available on TVNZ's mux - not enough to squash in *2* 400 kbps anyway - so I'm wondering where the bits will be "stolen" from to make the DD available.

mm

tehconz

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Reply # 496884 22-Jul-2011 18:46

Yes, DD will only be on 1 & 2. They will be 384k each. The DTT mux is fully utilized so the bandwidth will be "stolen" from across the board according to each channel's stat mux weighting.

Bandwidth across the mux is dynamically allocated to each channel depending on the amount of motion and complexity in the image at any given time. Adding the DD5.1 will slightly reduce the overall bandwidth pool, but won't be taken from any particular channel's allocation.

mm1352000

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Reply # 496896 22-Jul-2011 19:17

Thanks again tehconz - your comments are much appreciated!

fatjulio

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Master Geek

Reply # 509678 21-Aug-2011 20:01

Are we there yet...

hdinsider

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Reply # 509679 21-Aug-2011 20:05

No Dolby on One or 2 yet... not long till the rugby... tick tick tick...

don't mess with me.... i'm the hd insider....

tehconz

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Geek
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Reply # 509697 21-Aug-2011 20:51

I have it on good authority that this will be done in time for RWC. There have been some problems with the synthesized 5.1 generation so that will be disabled to start with. It will be the same as TV3's 2ch in 5.1 stream. This unfortunately means you loose ProLogic decoding on 2ch material, but apparently switching to a 2.0 dolby stream and back all the time causes issues with some consumer decoders.

Fingers crossed for 5.1 activation around end of August. No guarantees, just what I'm hearing around the building.

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