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Problem w/ OS X computer playback

COW Forums : Aurora Video Systems

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Jason LevineProblem w/ OS X computer playback
by on Jan 10, 2003 at 12:53:47 am

I just installed the new 5.0 driver and switched over to OS X. Seems like I've been waiting for this day forever. The ntsc video output looks good. But there is a big problem with the computer screen display (Apple cinema display 22", millions of colors) The best way I can describe it is it looks like the image is "banded" during playback. When sitting on still frames the ones that look the worst are the frames that are interlaced combination of two images (we are cutting footage that was shot on film and then transfered to video, so there is a 3:2 pulldown) It is as if the horizontal scan lines aren't evenly distributed down the frame and they bunch up at regular intervals. The problem is somewhat fixed if we switch off "display as square pixels". But this doesn't work at canvas sizes other than 50% and 100%.

Please help. I can't bear to switch back to OS 9.

Thanks
Jason


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dave fisherRe: Problem w/ OS X computer playback
by on Jan 10, 2003 at 2:47:29 pm

I have the same problem with an AVI file that I ran through After Effects to convert it it Quicktime. It has the same 'bands' on the video, and the footage is all film transfer stuff. I am going to try OS 9 to get the project out the door.

thanks
dave fisher


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Aurora SupportRe: Problem w/ OS X computer playback
by on Jan 11, 2003 at 10:29:48 pm

Thi effect you're seeing on Mac screen is due to the way Apple scales the preview window. We put an entire frame of video into memory, then point to it for FCP to put it on the screen. Final cut (in order to make the aspect ratio look correct) scales it vertically by 10%. If there is field-tear in the image due to objects being in motion, the scaling looks horrible. There are two things Apple could have done here: 1) Scale the image horizontally. This would look just like what you see when you turn off "view as square pixels". 2) They could have scaled the two fields individually, then re-interlaced.

What they chose to do however was to take over control of the DV codec and display only one field. This works great for DV, but isn't so easy to implement for any other QuickTime codec. Including ours. We will probably re-visit this in the future, and see if there's some way we can implement single field preview on the Mac.

- Mike


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Jason LevineRe: Problem w/ OS X computer playback
by on Jan 13, 2003 at 6:37:37 pm

Your post is very troubling to me. I know that it is not your fault that Apple has changed the way it writes video to the screen, but the idea that you will "probably re-visit this in the future" is simply unacceptable. How can you call the 5.0 driver a viable release when it doesn't display video properly?

The frustration you must feel with Apple is understandable. The fact that you don't see this as a problem that needs immediate attention...is not.


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David BattistellaRe: Problem w/ OS X computer playback
by on Jan 13, 2003 at 7:09:40 pm

Jason,

I am sure that you are not suggesting that Aurora techs go to apple and rewrite their code for them. I think you got an honest answer in this thread and you come back with a post that suggests that Aurora is not doing enough.

I rarely take issue with posts on this board, but I think that the problem was explained well by aurora tech. By acknowledging that they will look at it in the future they are saying that they will.

I am sure that Aurora has made apple aware of the problem. Would yo uexpect apple to release a 0.5 release to rectify the problem.

Jason, by using the aurora and FCP, yo uare on the leading edge of video technology. This stuff just was not even possible a few years ago. Especially for the cost of a system today yet everyone wants an AVID out of the box. Cards, updates to software and OS's, hardware, there is alot to keep track of and consider here. Not everyone is on the same page or moving at the same pace.

Sorry, I just don't think Aurora deserved this one.

David Battisella


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Jason LevineRe: Problem w/ OS X computer playback
by on Jan 13, 2003 at 10:47:25 pm

David,

First let me say, I love Aurora and I love FCP. I own 7 igniter cards and run a successful business that wouldn't exist without either of them. I understand the incredible opportunity that these products represent - I cut on an AVID for 8 years, so I know what the alternative costs and the astonomical bang for the buck that Igniter and FCP provide.

That being said...

I feel that we (Aurora users) have all been very patient with Aurora as they try to build a driver for OS X. I understand that the platform is completly different. And that it is a complete rewrite of the driver to work with a system that addresses hardware in a whole new way. On top of that, Apple keeps moving the target with 10.1 then 10.2, etc.

I was, and still am, willing to wait for Aurora to build a driver that works with OS X. I just don't want them to tell me that they've built a working driver, when they clearly haven't. If the video doesn't display properly - the driver doesn't work. I am more than willing to wait for all of the underlying issues to be solved - either by Apple or by Aurora.

What I mainly took issue with in Aurora's post was the idea that they would "probably" get to this in the future. Are they satisfied with the performance of the card in OS X? It seems to me that the appearance of the video on screen is either not a big issue or not even an issue at all. That sounds to me like they've given up. And I think we've all waited too long to let them do that.

Thanks,
Jason


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David BattistellaRe: Problem w/ OS X computer playback
by on Jan 13, 2003 at 11:11:05 pm



Jason.

Point taken and thatnk yo ufor the clarity. I hope you could read that I was not trying to start a war or anyting. I agree with much of what you are saying and It is a good idea for us to keep some pressure on Aurora to continue to tweak.

I get this problem too, mostly in teh Higher resolutions. Did your earlier post say that it was fine in 50 or 100 percent if you turn the square pixels off? I guess that is only halfway right.

I hope that they fix it up.

David


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Aurora SupportRe: Problem w/ OS X computer playback
by on Jan 14, 2003 at 6:03:46 am

Before you rip on our drivers for not doing what NOBODY else is doing, let's start at the beginning.

In the beginning there was QuickTime, and it was a "multi-media" standard for computer-based content. There was no specific support for hardware cards. Every manufacturer had to write drivers which would have to interact with their hardware, and handle everything from Audio sync to video frame timing.

Aurora was there. The Fuse card was our first offering, and we implemented numerous board-specific features through our drivers to make up for performance limitations of early Macs, as well as limitations in the QuickTime interface.

Igniter for OS 9 followed this philosophy also, leveraging some of the things we learned with Fuse. Over the past few of years, the QuickTime team at Apple has introduced, and improved the "Video Output Component" or "V-OUT". It was specifically designed to aid 3rd party hardware developers in implementing high-performance video playback with a simple and extensible programming architecture. Adobe Premiere 6 and up, FCP, and Recent versions of After Effects all implement this "V-OUT" technology. In FCP, it's called "External Video". In After Effects it's called "Video Preview". In Premiere, it has yet another name. Apple pushes all of their developers to implement video editing drivers using the VOUT standard.

Since our OS X driver was a complete "ground-up" rewrite, we took advantage of the latest QT advances, and Igniter supports the VOUT with two modes: One for Igniter-native Uncompressed and MJPEG formats, and one for support of "non-Igniter" formats. ADDITIONALLY, we spent weeks implementing a "Legacy" output mode for non-VOUT apps such as QT player. This is NOT a deficiency in the drivers.

Further, we're not going to appologize for doing what Apple recommends, as it makes things so much easier to implement for VOUT apps. Besides, no-one else in OS X can even output in QT player. We have almost 11,000 boards out there, of which about half are doing video preview for ProTools and other DAW apps. We implemented the "legacy apps" setting for these users. Hopefully, developers of these apps will also migrate to the "VOUT" implementation. If you want a "Player-type" app that hooks the Igniter VOUT, download "Simple-Vout" from Apple's developer site.

- Mike


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Aurora SupportRe: Problem w/ OS X computer playback
by on Jan 14, 2003 at 6:11:08 am

Sorry.. Accidentally hit send. I didn't get to the part where the VOUT component supports it's own Mac screen preview called the "echo port". Our OS 9 driver draws directly to the screen. Since this is not possible in OS X, we support it the same way that everyone else does. However, other boards show single field. We prefer to show the entire image. What we would REALLY like is for Apple to not scale it vertically.

- Mike


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Jason LevineRe: Problem w/ OS X computer playback
by on Jan 14, 2003 at 7:37:01 pm

Mike,

Thank you for taking the time for the detailed description of the current state of affairs with regard to Apple, QT, FCP and Aurora. I know the tremendous stress you guys must be under and know your job is not an easy one.

Heres a thought...Feel free to tell me I'm crazy.

Near the end of your post you said that other cards "show a single field. We prefer to show the entire image"

In OS 9 this was great. Igniter wrote directly to the screen and all was beautiful. In OS X (if I understand it correctly), Apple takes control of this function and prints to the screen in a different way (horizontal scale not vertical scale) thus making the screen image look (in my opinion) horrible.

That being the case, wouldn't it be helpful to add the option of setting the computer display to show only a single field? I, of course, appreciate how easy it is for me to suggest this, and how unbelievably hard something like this must be to implement.

Thanks,
Jason


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Aurora SupportRe: Problem w/ OS X computer playback
by on Jan 14, 2003 at 11:33:21 pm

This is exactly what our engineers are looking at. Perhaps even hooking the "field control" switch in Ignition to control what's on the Mac Screen. Like you said though, easier said than done. Right now our focus is on getting Core Audio to behave in a more sane manner so that people don't have problems with other apps not outputting audio.

Rest assured, if it can be done cleanly, our guys will do it fast. If not, it will just take more time. :)


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