Streaming from Decklink Duo 2

General
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1

Hello CasparCG-Community,

I am relatively new to the streaming topic, so I honestly do not know how to realize the following setup:

I have a Blackmagic Decklink Duo 2 Card installed in my PC and want to stream the SDI-Input (1080p30) via my computer over the network to another PC. Audio transmission is not required.

I have already tried to modify the config-file, but I always get a black screen. The config-file currently reads:

 <?xml version="1.0" encoding="utf-8" standalone="yes"?>
<configuration>
	<paths>
		<media-path>C:\CasparCG Server\Server\media\</media-path>
		<log-path>C:\CasparCG Server\Server\log\</log-path>
		<data-path>C:\CasparCG Server\Server\data\</data-path>
		<template-path>C:\CasparCG Server\Server\template\</template-path>
		<thumbnails-path>C:\CasparCG Server\Server\thumbnails\</thumbnails-path>
	</paths>
	<thumbnails>
		<video-mode>1080p3000</video-mode>
	</thumbnails>
	<channels>
		<channel>
			<video-mode>1080p3000</video-mode>
			<consumers>
				<decklink>
					<device>1</device>
				</decklink>
			</consumers>
		</channel>
	</channels>
	<controllers>
		<tcp>
			<port>5250</port>
			<protocol>AMCP</protocol>
		</tcp>
	</controllers>
</configuration>

The Decklink Cards Output is configured in the way the images I attached show. Connector Mapping is SDI 1 & SDI 2.

With Blackmagic’s Media Express software, the stream will show just fine. I just can’t figure out how to display the stream using CasparCG Server/Client.

Does anybody know how to do this? I’d really appreciate any help!

Lorenz

decklink1
decklink1622×972 32.6 KB

2

The way you configured gives you one output via SDI. To be able to stream you would need to add a streaming output, either from the config or via a command. You should find posts about this using the search function in the top right corner of this page.

3

I have now managed to get an image on the server side of my setup. My config file looks like this:

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<configuration>
  <paths>
    <media-path>media/</media-path>
    <log-path>log/</log-path>
    <data-path>data/</data-path>
    <template-path>template/</template-path>
    <thumbnails-path>thumbnails\</thumbnails-path>
  </paths>
  <thumbnails>
    <video-mode>1080p3000</video-mode>
  </thumbnails>
  <channels>
    <channel>
      <video-mode>1080p3000</video-mode>
      <consumers>
        <screen>
          <device>1</device>
          <name>test</name>
        </screen>
        <stream>
          <path>udp://@224.5.5.0:5004</path>
          <args>-vcodec libx264 -tune zerolatency -preset ultrafast -crf 25 -format mpegts -vf scale=1920:1080</args>
        </stream>
      </consumers>
    </channel>
  </channels>
  <osc>
    <default-port>5250</default-port>
  </osc>
  <controllers>
    <tcp>
      <port>5250</port>
      <protocol>AMCP</protocol>
    </tcp>
  </controllers>
</configuration>

Now I can start the stream with the following command in the console of the server:

PLAY 1-1 DECKLINK 2 FORMAT 1080p3000

(the SDI Input on the card comes through port 3)

Unfortunately, I can’t get the stream to work in VLC using udp://@224.5.5.0:5004 (broadcast IP of the network). Any ideas what I am doing wrong?

Many thanks in advance,

Lorenz

4

Addendum:

  • It doesn’t work by leaving out the “@” after the udp:// part of the url.

  • VLC recognizes, somehow, that there is a stream (clock on the lower left is running), but there is only the VLC logo where the video should be.