Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. |
|
|
Thread Tools | Search this Thread | Display Modes |
21st April 2009, 15:24 | #1 | Link |
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,771
|
NAB news: Silverlight 1080p24 playback and taste of new VC-1
I've got my big blog post up about what's happening with Silverlight at NAB:
http://on10.net/blogs/benwagg/NAB-Da...VC-1-and-more/ A few things of particular notice:
I thought the latter might whet folks appitite. It's a new 2-pass mode tuned for Smooth Streaming's multiple bitrate approach, so it offers the aligned Closed GOPs we need for seamless bitrate switching. And it offers a big improvement for 2-pass CBR in VC-1 in general due to a bunch of rate control and other improvements. We've got a number of partners working on incorporating it into their products. Here's a taste of it with Big Buck Bunny at 1920x1080 24 fps @ 4 Mbps. http://silverlight.services.live.com...ming/video.wmv There will be a lot more info about it in coming months. I can show some other samples here at NAB; they're also demoing at the Inlet booth. |
21st April 2009, 19:45 | #2 | Link |
Derek Prestegard IRL
Join Date: Nov 2003
Location: Los Angeles
Posts: 5,989
|
Looks pretty good, Ben!
Almost flawless, except for some pretty bad banding in the fades. Quite good for 1080p24 at 4mbps CBR. I didn't think VC-1 was capable of this. Still - you have to admit, Big Buck Bunny is pretty darned compressible I wonder how things would look at ~6mbps for a live action movie. x264's CBR surprises me with its visual quality, but its VBV model seems to choke at higher bitrates when you ask for CBR. -Derek
__________________
These are all my personal statements, not those of my employer :) Last edited by Blue_MiSfit; 21st April 2009 at 19:52. |
22nd April 2009, 00:10 | #3 | Link | |||
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,771
|
Quote:
We get a little hit by the Smooth Streaming requirement, as we're doing Closed GOPs every 2-ish seconds in order to provide easy switching points. Quote:
Quote:
|
|||
22nd April 2009, 03:54 | #4 | Link | ||
Derek Prestegard IRL
Join Date: Nov 2003
Location: Los Angeles
Posts: 5,989
|
Quote:
Quote:
Thanks for posting info in doom9 as always! -Derek
__________________
These are all my personal statements, not those of my employer :) |
||
24th April 2009, 08:44 | #5 | Link |
Registered User
Join Date: May 2008
Posts: 1,840
|
benwaggoner: As you work for microsoft could you inquire about their decoder having the ability to decode all interlaced VC-1 streams?
I posted a sample here Also as VC-1 directshow playback is very iffy on even current hardware do you know if they are planning on multithreaded decoding in the near future? |
24th April 2009, 13:08 | #6 | Link |
Doom9ing since 2001
Join Date: Oct 2001
Location: Seattle, WA, USA
Posts: 2,002
|
Speaking of x264... At our Microsoft booth at NAB we were also showing a 720p24 H.264 version of "Big Buck Bunny" (to demonstrate Silverlight 3's support for H.264/AAC/MP4). I encoded it using x264, of course.
|
24th April 2009, 16:35 | #8 | Link | ||
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,771
|
Quote:
Quote:
|
||
24th April 2009, 17:34 | #10 | Link | |
Registered User
Join Date: May 2008
Posts: 1,840
|
Quote:
While WMVideo decodes more than the only other free directshow decoder I know of, libavcodec from ffdshow. It still doesn't handle what has to be 30-40 retail BD streams reported so far. Hopefully you can help out as I don't see anyone else working on an alternative decoder. I don't know how to contact libavcodec devs outside of ffdshow thread/bug tracker where it's already been posted for months with no reply other than libavcodec doesn't decode interlaced streams, which wasn't helpful. I've also tried contacting microsoft a few months ago without any reply. Where do you see multithreaded VC-1 decoders? Last edited by turbojet; 24th April 2009 at 17:38. |
|
26th April 2009, 20:26 | #11 | Link | |||
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,771
|
Quote:
Quote:
Quote:
It's possible that the Win 7 software VC-1 decoder may also be multithreaded - haven't tried it myself on a machine that wouldn't have defaulted to the GPU. |
|||
27th April 2009, 21:39 | #12 | Link | |||
Registered User
Join Date: May 2008
Posts: 1,840
|
Quote:
Quote:
Quote:
If you want to see how widspread the problem is a large majority of these 50 bug reports can be narrowed down to lack of a VC-1 directshow decoder that can decode all interlaced streams. Last edited by turbojet; 27th April 2009 at 21:45. |
|||
28th April 2009, 01:29 | #13 | Link | |||
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,771
|
Quote:
And WMP 11 definitely supports DXVA. I use it all the time. Quote:
Win 7 has gotten a huge amount of media performance tuning as part of the general adoption of MediaFoundation. However, since that has lots of OS dependencies you shouldn't expect much of that to get backported to older versions of Windows. Quote:
|
|||
28th April 2009, 05:31 | #14 | Link | |
Registered User
Join Date: Nov 2005
Posts: 583
|
Quote:
1. WMVideo decoder only offer up to VC1_IDCT DXVA decoding (mode A,B and C). So DXVA does not work with ATI GPU that only support VC1_VLD (mode D). You can us DXVA Checker to determine the capabilities of GPU and decoders. http://bluesky23.hp.infoseek.co.jp/i...ml#DXVAChecker 2. So far I have not had any success getting WMVideo decoder to work with interlaced contents. Thanks and best regards. |
|
28th April 2009, 05:36 | #15 | Link |
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,771
|
@mariner,
Right. I'm not familiar with the backstory, but Mode D isn't ever going to be supported for XP/Vista AFAIK. ATI was informed about that ages ago, so it's really up to them to enable A, B, or C. My machines that do interlaced playback all have NVidia cards... |
28th April 2009, 07:56 | #19 | Link |
Registered User
Join Date: Dec 2007
Posts: 639
|
|
28th April 2009, 15:22 | #20 | Link | |||
Registered User
Join Date: May 2008
Posts: 1,840
|
Quote:
Quote:
Quote:
|
|||
Tags |
silverlight, vc-1 |
|
|