Chad Pearson
Forum Replies Created
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Video editing software like After Effects process the video internally, (or using the GPU on the other graphics card) and then send the final rendered frames to the playback card. The reason to use a separate playback card is either
A) you are already using both the outputs on your main graphics card (for your editor and/or other things)
B) you need to output in SDI, component or another broadcast signal (computer graphics card typically only support VGA/DVI/Displayport)
C) You need the audio embedded directly in the video signal and not played separately through your PC speakers (playing separately can cause lip sync issues since the audio/video signals are going out different paths from the computer to your monitor/speakers).
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The simplified answer is a “playback” card has no GPU and therefore no way to generate (composite) or process the frames of video as they are sent to the output. In other words it only accepts fully pre-rendered frames.
GPU’s on the other hand take multiple pieces of graphics, like bitmaps or vector based instructions (ie draw a line from point X to point Y) and composite it all together into a video frame to be sent to its output. Even just playing back a video in a window on your computer requires the video to be “shrunk” and inserted into a box with a menu and a close button. That processing is not done by the operating system, but by the GPU.
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What edition of Webex are you using? Webex took away the ability to use Blackmagic cards in the free/low-end version. Otherwise if you are on the Pro version you will need to match your incoming video signal to the format Webex is expecting because Blackmagic doesn’t do any scaling for you.
Try feeding in a standard def NTSC or PAL signal first and if that doesn’t work scale up from there.
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When you capture audio using the card are you also trying to capture video at the same time (ie through the HDMI or some other input)? Or are you just trying to use it as an audio capture device? In your Blackmagic control panel what is set for your Input Source? HDMI + Analog Audio, Composite + Analog Audio, Component + Analog Audio?
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USB and Firewire don’t have enough bandwidth to support the uncompressed video that a PCIe card puts out. Thunderbolt is really the only way to go on a Mac
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The only external thunderbolt chassis that supports PCIe cards I’ve seen is the Sonnet Echo Express line. They do appear to have updated their line to support thunderbolt 2, so they should work with your new MacPro tower.
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I have my polycom hooked up using the regular Blackmagic HDMI -> SDI converters and a $2 DVI to HDMI adapter, works great. What you are probably seeing is a colorspace issue (RGB vs YUV). Have you tried changing the Display settings on the polycom to various resolutions? I had to switch them to something else and then back again to get it to work right. Also make sure the DVI Extender is in “Video” mode and not “Extender” mode.
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I know it’s confusing, but 525i is the same thing as 720×480. The “additional lines” are used to put things like Closed Captioning and other metadata. It should work just fine.
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The Decklink Duo (and Decklink Quad) are the only Blackmagic products that will accept 2 (and 4) SDI inputs simultaneously. To record each signal you need to run the included Media Express software twice by making a copy of the executable binary and giving it a different name (ie. MediaExpress.exe and MediaExpress2.exe on PC). Each Media Express instance will allow you to choose one of the Duo’s (or Quad’s) inputs to begin recording.
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No. The Hyperdeck’s only have 1 input. The other 3 connectors are for 3G and 6G video signals that are split over multiple cables due to bandwidth limitations.