Hello,
I am having issues with Decklink 12.0 and Caspar 2.07.
When I start up caspar it gives me a
“[2021-07-09 07:42:26.630] [8844] [info] Sent message to 192.168.56.101: 501 PLAY FAILED\r\n
[2021-07-09 07:42:27.606] [7436] [info] Client 192.168.56.101 was disconnected”
error. But when I “add one screen” I can see my video playing fine.
The decklink will output video properly through its own software as well.
Any advice?
Thanks!
Please share your complete config. With that less info we can´t help. 
Here is my config:
Decklink does communicate with Casapar now. But the HDMI output flashes the screen on and off.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<paths>
<media-path>media\</media-path>
<log-path>media\log\</log-path>
<data-path>data\</data-path>
<template-path>templates\</template-path>
<thumbnails-path>thumbnails\</thumbnails-path>
</paths>
<channels>
<channel>
<video-mode>1080i5994</video-mode>
<consumers>
<decklink>
<device>1</device>
<key-only>false [true|false]</key-only>
<buffer-depth>3</buffer-depth>
</decklink>
</consumers>
</channel>
</channels>
<controllers>
<tcp>
<port>5250</port>
<protocol>AMCP</protocol>
</tcp>
</controllers>
</configuration>
<!--
<log-level> trace [trace|debug|info|warning|error]</log-level>
<channel-grid> false [true|false]</channel-grid>
<mixer>
<blend-modes> false [true|false]</blend-modes>
<straight-alpha> false [true|false]</straight-alpha>
<chroma-key> false [true|false]</chroma-key>
<mipmapping_default_on>false [true|false]</mipmapping_default_on>
</mixer>
<auto-deinterlace>true [true|false]</auto-deinterlace>
<auto-transcode> true [true|false]</auto-transcode>
<pipeline-tokens> 2 [1..] </pipeline-tokens>
<template-hosts>
<template-host>
<video-mode/>
<filename/>
<width/>
<height/>
</template-host>
</template-hosts>
<flash>
<buffer-depth>auto [auto|1..]</buffer-depth>
</flash>
<thumbnails>
<generate-thumbnails>true [true|false]</generate-thumbnails>
<width>256</width>
<height>144</height>
<video-grid>2</video-grid>
<scan-interval-millis>5000</scan-interval-millis>
<generate-delay-millis>2000</generate-delay-millis>
<video-mode>720p2500</video-mode>
<mipmap>false</mipmap>
</thumbnails>
<channels>
<channel>
<video-mode> PAL [PAL|NTSC|576p2500|720p2398|720p2400|720p2500|720p5000|720p2997|720p5994|720p3000|720p6000|1080p2398|1080p2400|1080i5000|1080i5994|1080i6000|1080p2500|1080p2997|1080p3000|1080p5000|1080p5994|1080p6000|1556p2398|1556p2400|1556p2500|dci1080p2398|dci1080p2400|dci1080p2500|2160p2398|2160p2400|2160p2500|2160p2997|2160p3000|dci2160p2398|dci2160p2400|dci2160p2500] </video-mode>
<channel-layout>stereo [mono|stereo|dts|dolbye|dolbydigital|smpte|passthru]</channel-layout>
<straight-alpha-output>false [true|false]</straight-alpha-output>
<consumers>
<decklink>
<device>[1..]</device>
<key-device>device + 1 [1..]</key-device>
<embedded-audio>false [true|false]</embedded-audio>
<channel-layout>stereo [mono|stereo|dts|dolbye|dolbydigital|smpte|passthru]</channel-layout>
<latency>normal [normal|low|default]</latency>
<keyer>external [external|external_separate_device|internal|default]</keyer>
<key-only>false [true|false]</key-only>
<buffer-depth>3 [1..]</buffer-depth>
<custom-allocator>true [true|false]</custom-allocator>
</decklink>
<bluefish>
<device>[1..]</device>
<embedded-audio>false [true|false]</embedded-audio>
<channel-layout>stereo [mono|stereo|dts|dolbye|dolbydigital|smpte|passthru]</channel-layout>
<key-only>false [true|false]</key-only>
</bluefish>
<system-audio></system-audio>
<screen>
<device>[0..]</device>
<aspect-ratio>default [default|4:3|16:9]</aspect-ratio>
<stretch>fill [none|fill|uniform|uniform_to_fill]</stretch>
<windowed>false [true|false]</windowed>
<key-only>false [true|false]</key-only>
<auto-deinterlace>true [true|false]</auto-deinterlace>
<vsync>false [true|false]</vsync>
<name>[Screen Consumer]</name>
<borderless>false [true|false]</borderless>
</screen>
<newtek-ivga>
<channel-layout>stereo [mono|stereo|dts|dolbye|dolbydigital|smpte|passthru]</channel-layout>
<provide-sync>true [true|false]</provide-sync>
</newtek-ivga>
<file>
<path></path>
<vcodec>libx264 [libx264|qtrle]</vcodec>
<separate-key>false [true|false]</separate-key>
</file>
<stream>
<path></path>
<args></args>
</stream>
</consumers>
</channel>
</channels>
<osc>
<default-port>6250</default-port>
<predefined-clients>
<predefined-client>
<address>127.0.0.1</address>
<port>5253</port>
</predefined-client>
</predefined-clients>
</osc>
<audio>
<channel-layouts>
<channel-layout>
<name>mono</name>
<type>1.0</type>
<num-channels>1</num-channels>
<channels>C</channels>
</channel-layout>
<channel-layout>
<name>stereo</name>
<type>2.0</type>
<num-channels>2</num-channels>
<channels>L R</channels>
</channel-layout>
<channel-layout>
<name>dts</name>
<type>5.1</type>
<num-channels>6</num-channels>
<channels>C L R Ls Rs LFE</channels>
</channel-layout>
<channel-layout>
<name>dolbye</name>
<type>5.1+stereomix</type>
<num-channels>8</num-channels>
<channels>L R C LFE Ls Rs Lmix Rmix</channels>
</channel-layout>
<channel-layout>
<name>dolbydigital</name>
<type>5.1</type>
<num-channels>6</num-channels>
<channels>L C R Ls Rs LFE</channels>
</channel-layout>
<channel-layout>
<name>smpte</name>
<type>5.1</type>
<num-channels>6</num-channels>
<channels>L R C LFE Ls Rs</channels>
</channel-layout>
<channel-layout>
<name>passthru</name>
<type>16ch</type>
<num-channels>16</num-channels>
<channels />
</channel-layout>
</channel-layouts>
<mix-configs>
<mix-config>
<from>1.0</from>
<to>2.0</to>
<mix>add</mix>
<mappings>
<mapping>C L 1.0</mapping>
<mapping>C R 1.0</mapping>
</mappings>
</mix-config>
<mix-config>
<from>1.0</from>
<to>5.1</to>
<mix>add</mix>
<mappings>
<mapping>C L 1.0</mapping>
<mapping>C R 1.0</mapping>
</mappings>
</mix-config>
<mix-config>
<from>1.0</from>
<to>5.1+stereomix</to>
<mix>add</mix>
<mappings>
<mapping>C L 1.0</mapping>
<mapping>C R 1.0</mapping>
<mapping>C Lmix 1.0</mapping>
<mapping>C Rmix 1.0</mapping>
</mappings>
</mix-config>
<mix-config>
<from>2.0</from>
<to>1.0</to>
<mix>add</mix>
<mappings>
<mapping>L C 1.0</mapping>
<mapping>R C 1.0</mapping>
</mappings>
</mix-config>
<mix-config>
<from>2.0</from>
<to>5.1</to>
<mix>add</mix>
<mappings>
<mapping>L L 1.0</mapping>
<mapping>R R 1.0</mapping>
</mappings>
</mix-config>
<mix-config>
<from>2.0</from>
<to>5.1+stereomix</to>
<mix>add</mix>
<mappings>
<mapping>L L 1.0</mapping>
<mapping>R R 1.0</mapping>
<mapping>L Lmix 1.0</mapping>
<mapping>R Rmix 1.0</mapping>
</mappings>
</mix-config>
<mix-config>
<from>5.1</from>
<to>1.0</to>
<mix>average</mix>
<mappings>
<mapping>L C 1.0</mapping>
<mapping>R C 1.0</mapping>
<mapping>C C 0.707</mapping>
<mapping>Ls C 0.707</mapping>
<mapping>Rs C 0.707</mapping>
</mappings>
</mix-config>
<mix-config>
<from>5.1</from>
<to>2.0</to>
<mix>average</mix>
<mappings>
<mapping>L L 1.0</mapping>
<mapping>R R 1.0</mapping>
<mapping>C L 0.707</mapping>
<mapping>C R 0.707</mapping>
<mapping>Ls L 0.707</mapping>
<mapping>Rs R 0.707</mapping>
</mappings>
</mix-config>
<mix-config>
<from>5.1</from>
<to>5.1+stereomix</to>
<mix>average</mix>
<mappings>
<mapping>L L 1.0</mapping>
<mapping>R R 1.0</mapping>
<mapping>C C 1.0</mapping>
<mapping>Ls Ls 1.0</mapping>
<mapping>Rs Rs 1.0</mapping>
<mapping>LFE LFE 1.0</mapping>
<mapping>L Lmix 1.0</mapping>
<mapping>R Rmix 1.0</mapping>
<mapping>C Lmix 0.707</mapping>
<mapping>C Rmix 0.707</mapping>
<mapping>Ls Lmix 0.707</mapping>
<mapping>Rs Rmix 0.707</mapping>
</mappings>
</mix-config>
<mix-config>
<from>5.1+stereomix</from>
<to>1.0</to>
<mix>add</mix>
<mappings>
<mapping>Lmix C 1.0</mapping>
<mapping>Rmix C 1.0</mapping>
</mappings>
</mix-config>
<mix-config>
<from>5.1+stereomix</from>
<to>2.0</to>
<mix>add</mix>
<mappings>
<mapping>Lmix L 1.0</mapping>
<mapping>Rmix R 1.0</mapping>
</mappings>
</mix-config>
<mix-config>
<from>5.1+stereomix</from>
<to>5.1</to>
<mix>add</mix>
<mappings>
<mapping>L L 1.0</mapping>
<mapping>R R 1.0</mapping>
<mapping>C C 1.0</mapping>
<mapping>Ls Ls 1.0</mapping>
<mapping>Rs Rs 1.0</mapping>
<mapping>LFE LFE 1.0</mapping>
</mappings>
</mix-config>
</mix-configs>
</audio>
-->
I swapped my card out for one I had lying around with older firmware on it and HDMI does now work
<key-only>false [true|false]</key-only>
You have this in your config. Won´t work…
Change it to:
<key-only>false</key-only>
And then we´ll see if it works 
Make sure your devices/monitors are capable of 1080i5994 on the SDI input.