Playback Issues with Decklink

General
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1

Hello Caspar Community,
we are working for the last months on our casparcg playback server and we are now having problems with playback through our Decklink Duo Card.

Playback through HDMI / Display Port is runnning flawless. But we got constant audio droputs/glitches and video-glitches on playback through the Decklink Duo 2.

I really like CasparCG and spent so much time to understand all the settings. But I have really no clue, what might be the issue here. Could you guys perhaps help us out here?

First some hardware specs: We are using a HP Z2 Workstation with:

  • Intel® Core™ i7-9700 CPU
  • 16 GB Ram
  • NVIDIA Quadro P2200

This is the Diag Window without playback:

casparcg
casparcg1681Ă—1049 246 KB

And this is our configuration file.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <paths>
        <media-path>C:\Users\MoreCoreStudio\OneDrive - MoreCore UG (haftungsbeschränkt)\Desktop\CasparMedia\</media-path>
        <log-path>log\</log-path>
        <data-path>data\</data-path>
        <template-path>C:\Users\MoreCoreStudio\OneDrive - MoreCore UG (haftungsbeschränkt)\Desktop\CasparTemplates\</template-path>
    </paths>
    <html>
    <enable-gpu>true</enable-gpu>
    </html>
    <channels>
      <channel>
        <video-mode>720p3000</video-mode>
        <consumers>
          <screen>
            <device>1</device>
            <aspect-ratio>16:9</aspect-ratio>
            <stretch>fill</stretch>
            <windowed>false</windowed>
            <key-only>false</key-only>
            <vsync>false</vsync>
            <borderless>true</borderless>
            <interactive>true</interactive>
            <always-on-top>true</always-on-top>
          </screen>
        </consumers>
    </channel>
        <channel>
        <video-mode>1080p3000</video-mode>
        <consumers>
           <decklink>
            <device>1</device>
               <key-device>2</key-device>
               <embedded-audio>true</embedded-audio>
               <latency>normal</latency>
               <keyer>external</keyer>
               <key-only>false</key-only>
               <buffer-depth>3</buffer-depth>
           </decklink>
           <system-audio>
               <channel-layout>stereo</channel-layout>
               <latency>0</latency>
           </system-audio>
        </consumers>
    </channel>

    <channel>
    <video-mode>1080p3000</video-mode>
        <consumers>
          <decklink>
            <device>2</device>
              <embedded-audio>true</embedded-audio>
              <latency>normal</latency>
              <keyer>external</keyer>
              <buffer-depth>4</buffer-depth>
            </decklink>
            <system-audio>
                <channel-layout>stereo</channel-layout>
                <latency>0</latency>
            </system-audio>
          </consumers>
        </channel>
      </channels>
    <controllers>
        <tcp>
            <port>5250</port>
            <protocol>AMCP</protocol>
        </tcp>
    </controllers>
    <amcp>
        <media-server>
            <host>localhost</host>
            <port>8000</port>
        </media-server>
        <diagnostics>
          <graphs>true</graphs>
        </diagnostics>
    </amcp>
</configuration>

Do you guys have an idea what we can do to solve the glitches and dropouts?

Best wishes,
Mike

2

Hi
If its possible try to install DUO to a differenr PCI lane If you have a second PCI for GPU try first on this one.
In my case my problem solved.
And I dont know How this Sytem -Audio work together with embedded audio I think system Audio is to use system audio card.
Also DUO doesnt need to have a seperate tag for KEY you can enable from Blackmagic DesktopVideo just pair the output ex. SDI1&SDI2

1 Like
3

Hey Tsipas,
i will check out your ideas immediately. Regarding system audio and embedded audio. We need both, because the SDI Sound is directly connected to our atem mini extreme iso (for recording) and the system audio is routed to our xr18 mixer for in-room-monitoring.

will try out your other both hints!
thanks a lot!

4

well, changing the pci lane worked for us, too!

thank you very much!

5

Had similar issues with exactly same hardware. Found an alternative solution to this issue at the time: disable all power save related settings in BIOS. Also disabled integrated audio devices and internal GPU (not sure i necessary).

Under “Built-in Device Options”:

  • Runtime Power Management: Disable
  • Extended Idle Power States: Disable
  • S4/S5 Maximum Power Savings: Disalbe
  • PCI Express Power Management: Disable
1 Like