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Forums Blackmagic Design DeckLink Extreme Questions/Problems

  • DeckLink Extreme Questions/Problems

  • Patrick McLoad

    August 1, 2005 at 11:39 pm

    I use DeckLink Extreme to capture BetaSP YUV into FCP5 on a G5 2.7 dualie. I have latest Tiger upgrade, latest DeckLink driver, and latest FCP version. (I do not have QTPro installed yet.) I can hear no audio at all from the deck (XLR), but FCP captures and plays audio just fine. As far as I know all of the audio preferences are set correctly, including those in system preferences…still no joy.

    Now, the second issue. I use an HDLink box (I think thats what it’s called) to feed a Standard Def. signal to a 20″ HD Cinema Display for reference purposes. I use the SDI output BNC to the input on the box. However, the 4:3 signal is stretched to I assume, a 16:9 ratio. Can someone tell me how to get a 4:3 signal on one of these screens? Is my screen-setup choice incorrect?

    Many thanks for your time and advice.

    P Mc
    Houston

  • David Roth Weiss

    August 2, 2005 at 4:11 am

    [Patrick McLoad] “I use DeckLink Extreme to capture BetaSP YUV into FCP5 on a G5 2.7 dualie. I have latest Tiger upgrade, latest DeckLink driver, and latest FCP version. (I do not have QTPro installed yet.) I can hear no audio at all from the deck (XLR), but FCP captures and plays audio just fine. As far as I know all of the audio preferences are set correctly, including those in system preferences…still no joy.”

    Patrick,

    The good news is it works. I know cuz I’m doing pretty much exactly what you want to be doing with my new Extreme card and my BetaSP deck, and its all zipping along quite nicely with great audio and great picture. The bad news is, I’m patched through a Mackie Mixer and I’m not exactly remembering just now exactly how I hooked that up. If you still haven’t figured it al out by tomorrow I’ll see if I can be more helpful.

    DRW

  • Patrick McLoad

    August 2, 2005 at 12:54 pm

    David: Thanks for the response. Yes, I am sending the audio output of my card (XLR) to a Soundcraft mixer which goes through a Crown D75 amp to JBL Studio monitors. I just wish I knew where the trouble is.

    P

  • Peter Reventlow

    August 2, 2005 at 8:55 pm

    I think you’re having the same problem as I mailed BlackMagic about a year ago. I’m using a Decklink extreme card in a G5 dual 2 gHz – OSX 10.3.9, QT 6.5.2 and 4.8 decklink drivers.

    In my situation I don’t have sound out of neither decklink XLR or spdif when I’m capturing, as long as I have selected “Black Video output to Deck in capture” enabled. Disenabling it brings back audio.

    HTH
    Peter

  • Patrick McLoad

    August 2, 2005 at 10:10 pm

    Peter: VERY Interesting, and many thanks for the reply!!!! That actually fixed the problem and I can now hear the audio while in log and capture in FCP (as well as see the video in the monitor). You are a genius!! I would have never ever ever ever found that!

    I also learned another trick (sort of). If I want to hear audio from the deck as well as see video on the monitor while NOT in FCP log & capture, I have to open the SOUND panel in SYSTEM SETTINGS and leave it open (minimized down into the application dock). The minute I quit system settings, it all goes away.

    So at least I now have a workable system, and again, my thanks to you.

    I still need to find a solution to the output. Seems my only two output choices is SD 16:9 letterbox and 16:9 anamorphic. Sure wish there was a 3rd choice for 4:3.

    Patrick McLoad
    Houston

    I hope the BMD folks take note of this fix!

  • David Roth Weiss

    August 2, 2005 at 10:53 pm

    Patrick,

    Should you ever try to use Soundtrack Pro you will encounter the same issue. Make certain to set Input Audio to something othet than Deckilnk in its Prefs too or you’ll be stuck. I spent the entire morning woking on that silly issue myself, and it was Peter’s message to you that cleared it up for me.

    DRW

  • Patrick McLoad

    August 2, 2005 at 10:57 pm

    Great tip…thanks!

    P

  • Luke Maslen

    August 4, 2005 at 5:45 am

    Hi Peter,

    Thanks for your post and this is correct behavior if you are using the DeckLink card to generate a sync signal for the deck during capture. Please check the technical note How to sync a deck with a DeckLink card and specifically note the section named “Audio monitoring issues”. You will note further down in the technical note, it mentions the following.

    If you wish to monitor audio while capturing video from a deck, then you will need to use a blackburst generator to keep your video in sync. Disable the option “Black Video Output to Deck in Capture” and make sure you choose the “auto” or “external” reference setting on your deck.

    BTW, we recommend Mac OS X 10.3.8 but not Mac OS X 10.3.9 for use with Final Cut Pro HD 4.5 and DeckLink 4.8 drivers. Hopefully you won’t have any issues but, if you do, consider reverting to Mac OS X 10.3.8.

    Regards,

    Luke Maslen
    Blackmagic Design

  • Luke Maslen

    August 4, 2005 at 6:02 am

    Hi Patrick,

    [Patrick McLoad] “VERY Interesting, and many thanks for the reply!!!! That actually fixed the problem and I can now hear the audio while in log and capture in FCP (as well as see the video in the monitor). You are a genius!! I would have never ever ever ever found that!”

    This is normal behavior if you are using the DeckLink card to generate a sync signal for the deck during capture. Please check the technical note How to sync a deck with a DeckLink card and specifically note the section named “Audio monitoring issues”. You will note further down in the technical note, it mentions the following.

    If you wish to monitor audio while capturing video from a deck, then you will need to use a blackburst generator to keep your video in sync. Disable the option “Black Video Output to Deck in Capture” and make sure you choose the “auto” or “external” reference setting on your deck.

    The DeckLink PDF manual also briefly covers this point but the technical note is more informative.

    [Patrick McLoad] “I still need to find a solution to the output. Seems my only two output choices is SD 16:9 letterbox and 16:9 anamorphic. Sure wish there was a 3rd choice for 4:3.”

    HDTV uses square pixels for display as does your computer monitor. SDTV uses rectangular pixels for display which is different to your computer monitor.

    HDLink is primarily designed for display of HDTV. It uses square pixels and maps them perfectly, pixel for pixel, on to the screen.

    HDLink can also be used for SDTV monitoring but there are some technicalities related to the fact that HDLink is displaying square pixels whereas standard definition uses rectangular pixels and that is why your circles may display egg-shaped.

    Here’s some more in-depth information. HDLink is doing what it is supposed to do, ie displaying pixel for pixel on screen as LCD monitors use square pixels. The NTSC frame size of 720 x 486, and the PAL frame size of 720 x 576, are not in the 4:3 format and so the image appears to be somewhat squashed when displayed on screen, particularly with NTSC material. Accordingly, there are two things we are doing to help standard definition users:
    1. The latest HDLink Utility posted on the Support page of our web site includes stretching to display a 16:9 anamorphic standard definition correctly. The use of stretching means that pixel for pixel mapping is no longer possible, as that is the nature of LCD displays, but the result still looks very good.
    2. We are currently investigating the possibility of adding a 4:3 mode to force standard definition to be displayed in the 4:3 aspect ratio as this would solve your problem. As with 16:9, this involves the use of stretching and so cannot be true pixel for pixel mapping. I cannot guarantee this feature will be added to the HDLink but it is something we would like to do if we can.

    Different kinds of technology are designed for different purposes. LCD monitors provide perfect pixel for pixel display of HDTV but stretching and scaling is required to display SDTV at either 16:9 or 4:3 aspect ratios. We’ve received a lot of requests for 16:9 SD and that is now implemented in the driver update on our web site. We’ve received very few requests for 4:3 mode in HDLink and this probably means that most HDLink owners are using it for HDTV. There are a number of new features we would like to add to HDLink and we will investigate adding 4:3 SD over the coming few months as part of any feature upgrade.

    If you want to do some testing, open any bitmap paint program, other than Photoshop CS, and then draw a circle. Now drag it out on to the LCD monitor attached to HDLink and it will remain circular as both the computer monitor, and your LCD monitor, are displaying square pixels. However, if you have a conventional SDI monitor, or a card or adapter which provides analog monitoring, you will find the circle becomes an ellipse when you drag it on to the broadcast monitor.

    For this very reason, Photoshop CS gives you some extra options when creating a new document. Specifically, it enables you to choose between square pixels and pixels appropriate for NTSC or PAL.

    By selecting options for NTSC or PAL, you can guarantee that a circle drawn in Photoshop CS will indeed appear as a circle on your broadcast monitor. Launch Photoshop CS and choose to create a new document. Select a NTSC or PAL preset. As you can see from the following screenshot, the Pixel Aspect Ration is set to something other than “square”.

    When you are working in Photoshop CS, the circle on your monitor will output as a circle on your broadcast monitor. However if you go to the View menu and disable the “Photoshop Pixel Aspect Ratio Correction” option, the circle will appear on your computer monitor as an ellipse.

    Regards,

    Luke Maslen
    Blackmagic Design

  • Peter Reventlow

    August 4, 2005 at 7:15 am

    Thanks for your response Luke.

    The funny thing about the audio monitor issue is that I mailed BMD techsupport last september because I could not monitor audio when I captured using black out. Shane wrote back and told me that they would have a fix for it within a week or two. I’ve been waiting ever since… Now it seems that the issue has changed status from bug to feature 😉
    I will, however, still urge you to make it possible to monitor audio during capture with black out selected. It kind of ruins the simplicity about the DeckLink Extreme setup that I love, because I have to either patch cables or use an audiomixer to be able to monitor during capture.

    Regards form an otherwise very happy customer,

    Peter

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