# Mono sound out

**URL:** <https://casparcgforum.org/t/mono-sound-out/3950>\
**Category:** General\
**Tags:** audio, client, blackmagic\
**Created:** [February 13, 2021, 10:43am UTC](https://casparcgforum.org/t/mono-sound-out/3950 "2021-02-13T10:43:18Z")\
**Posts on this page:** 14\
**Page:** 1

<div class="post-metadata">

**Author:** ![KevinM](https://casparcgforum.org/letter_avatar_proxy/v4/letter/k/85e7bf/32.png) [@KevinM](https://casparcgforum.org/u/KevinM)\
**Post date:** [February 13, 2021, 10:43am UTC](https://casparcgforum.org/t/mono-sound-out/3950/1 "2021-02-13T10:43:18Z")

</div>

Is it possible to get mono sound out of CasparCG?

the scenario is:  
Stereo sound in SDI video into Blackmagic card.  
Use track 1 only and send it on track 1 & 2 at the output of CasparCG (Blackmagic)

---

<div class="post-metadata">

**Author:** ![vimlesh1975](https://casparcgforum.org/user_avatar/casparcgforum.org/vimlesh1975/32/1608_2.png) [@vimlesh1975](https://casparcgforum.org/u/vimlesh1975)\
**Post date:** [February 14, 2021, 9:21am UTC](https://casparcgforum.org/t/mono-sound-out/3950/2 "2021-02-14T09:21:22Z")

</div>

I tried this with a file and not with decklink input but i guess it will work in simmilar way. Just replace filename with decklink 1

We need to put audio config in casparcg.config file as bellow.

 ![Untitled](https://casparcgforum.org/uploads/default/original/2X/b/bf1f19a65229b32cb223570326345e3db37a42aa.png)

Server 2.07  
Audio Config

```auto
<audio>
  <channel-layouts>
  <channel-layout>
<name>R_to_Both</name>
<type>xyz</type>
<num-channels>2</num-channels>
<channels>1 2</channels>
</channel-layout>

 <channel-layout>
<name>L_to_Both</name>
<type>xyz1</type>
<num-channels>2</num-channels>
<channels>1 2</channels>
</channel-layout>

 <channel-layout>
<name>Mix</name>
<type>xyz2</type>
<num-channels>2</num-channels>
<channels>1 2</channels>
</channel-layout>

 <channel-layout>
<name>Only_L</name>
<type>xyz3</type>
<num-channels>2</num-channels>
<channels>1 2</channels>
</channel-layout>

 <channel-layout>
<name>Only_R</name>
<type>xyz4</type>
<num-channels>2</num-channels>
<channels>1 2</channels>
</channel-layout>

 </channel-layouts>

<mix-configs>

<mix-config>
<from>xyz</from>
<to>2.0</to>
<mix>add</mix>
<mappings>
<mapping>2 L 1.0</mapping>
<mapping>2 R 1.0</mapping>
</mappings>
</mix-config>

<mix-config>
<from>xyz1</from>
<to>2.0</to>
<mix>add</mix>
<mappings>
<mapping>1 L 1.0</mapping>
<mapping>1 R 1.0</mapping>
</mappings>
</mix-config>

<mix-config>
<from>xyz2</from>
<to>2.0</to>
<mix>add</mix>
<mappings>
<mapping>1 L 0.7</mapping>
<mapping>2 R 0.7</mapping>
<mapping>1 R 0.7</mapping>
<mapping>2 L 0.7</mapping>
</mappings>
</mix-config>

<mix-config>
<from>xyz3</from>
<to>2.0</to>
<mix>add</mix>
<mappings>
<mapping>1 L 1.0</mapping>
<mapping>1 R 0.0</mapping>
</mappings>
</mix-config>

<mix-config>
<from>xyz4</from>
<to>2.0</to>
<mix>add</mix>
<mappings>
<mapping>2 L 0.0</mapping>
<mapping>2 R 1.0</mapping>
</mappings>
</mix-config>

</mix-configs>
</audio>

```

play 1-1 “filename” channel\_layout L\_to\_Both

Server 2.1  
Audio Config

```auto
<audio>
<channel-layouts>

<channel-layout name="R_to_Both" type="xyz" num-channels="2" channel-order="FL FR" />
<channel-layout name="L_to_Both" type="xyz1" num-channels="2" channel-order="FL FR" />
<channel-layout name="Mix" type="xyz2" num-channels="2" channel-order="FL FR" />
<channel-layout name="Only_L" type="xyz3" num-channels="2" channel-order="FL FR" />
<channel-layout name="Only_R" type="xyz4" num-channels="2" channel-order="FL FR" />
</channel-layouts>

<mix-configs>
<mix-config from-type="xyz" to-types="stereo" mix="FL=FR | FR=FR" />
<mix-config from-type="xyz1" to-types="stereo" mix="FL=FL | FR=FL" />	
<mix-config from-type="xyz2" to-types="stereo" mix="FL=0.7FL+0.7FR | FR=0.7FL+0.7FR" />
<mix-config from-type="xyz3" to-types="stereo" mix="FL=FL | FR=0FR" />	
<mix-config from-type="xyz4" to-types="stereo" mix="FL=0FL | FR=FR" />		
</mix-configs>

</audio>

```

play 1-1 “filename” channel\_layout L\_to\_Both

Server 2.3  
Audio Config- no audio config required.

play 1-1 “filename” af pan=stereo|c0=c0|c1=c0

---

<div class="post-metadata">

**Author:** ![KevinM](https://casparcgforum.org/letter_avatar_proxy/v4/letter/k/85e7bf/32.png) [@KevinM](https://casparcgforum.org/u/KevinM)\
**Post date:** [February 16, 2021, 4:12pm UTC](https://casparcgforum.org/t/mono-sound-out/3950/3 "2021-02-16T16:12:05Z")

</div>

Thanks!  
Do you know if it’s the same when I run CasparCG Server v2.3.0

---

<div class="post-metadata">

**Author:** ![vimlesh1975](https://casparcgforum.org/user_avatar/casparcgforum.org/vimlesh1975/32/1608_2.png) [@vimlesh1975](https://casparcgforum.org/u/vimlesh1975)\
**Post date:** [February 16, 2021, 4:17pm UTC](https://casparcgforum.org/t/mono-sound-out/3950/4 "2021-02-16T16:17:10Z")

</div>

Server 2.3  
Audio Config- no audio config required.

play 1-1 “filename” af pan=stereo|c0=c0|c1=c0

---

<div class="post-metadata">

**Author:** ![KevinM](https://casparcgforum.org/letter_avatar_proxy/v4/letter/k/85e7bf/32.png) [@KevinM](https://casparcgforum.org/u/KevinM)\
**Post date:** [February 16, 2021, 7:41pm UTC](https://casparcgforum.org/t/mono-sound-out/3950/5 "2021-02-16T19:41:11Z")

</div>

Thanks for being a big help.

This works:  
PLAY 1-10 DECKLINK DEVICE 1 FORMAT 1080i5000 af pan=stereo|c0=c0|c1=c0

Do you know if it is possible to do it on the fly, if I discover it should be mono after it is started?  
have tried with: MIXER 1-10 af pan=stereo|c0=c0|c1=c0  
as you can do with e.g. volume adjustment. But it does not work

The only way I found out is to STOP 1-10 and PLAY it again with full command.  
Thanks again for your help

---

<div class="post-metadata">

**Author:** ![Ingo](https://casparcgforum.org/user_avatar/casparcgforum.org/ingo/32/1419_2.png) [@Ingo](https://casparcgforum.org/u/Ingo)\
**Post date:** [May 3, 2022, 11:09am UTC](https://casparcgforum.org/t/mono-sound-out/3950/6 "2022-05-03T11:09:42Z")

</div>

Hi vimlesh,

I have a similar problem. Maybe you know how to help.  
I’m running server 2.1.11 NRK fork. The decklink output ist configured “16ch”.  
Is it possible to play a stereo clip on that channel and to dub the stereo to all 16 audio channels?  
I hoped

```auto
<channel-layout name="dubbed" type="xyz" num-channels="16" channel-order="FL FR FL FR FL FR FL FR FL FR FL FR FL FR FL FR FL FR" />

```

together with

```auto
<mix-config from-type="xyz" to-types="16ch" mix="FL=FL | FR=FR" />

```

will work, but it doesn’t.  
Any suggestions?

Thanks.  
Ingo

P.S.: I’m certainly calling CHANNEL\_LAYOUT “dubbed” from the client.

---

<div class="post-metadata">

**Author:** ![vimlesh1975](https://casparcgforum.org/user_avatar/casparcgforum.org/vimlesh1975/32/1608_2.png) [@vimlesh1975](https://casparcgforum.org/u/vimlesh1975)\
**Post date:** [May 20, 2022, 6:05am UTC](https://casparcgforum.org/t/mono-sound-out/3950/7 "2022-05-20T06:05:02Z")

</div>

I got a config file which works by giving command like

```auto
play 1-1 go1080p25

```

[https://drive.google.com/file/d/1QinFIKusDRJtkyAB4dcEbCO5EsWSjwaB/view?usp=sharing](https://drive.google.com/file/d/1QinFIKusDRJtkyAB4dcEbCO5EsWSjwaB/view?usp=sharing)

---

<div class="post-metadata">

**Author:** ![Ingo](https://casparcgforum.org/user_avatar/casparcgforum.org/ingo/32/1419_2.png) [@Ingo](https://casparcgforum.org/u/Ingo)\
**Post date:** [May 20, 2022, 9:06am UTC](https://casparcgforum.org/t/mono-sound-out/3950/8 "2022-05-20T09:06:33Z")

</div>

Hi vimlesh,

Thank you for sharing.  
Unfortunately that doesn’t work for me. I got a server error message when I try to send  
`play 1-1 go1080p25`

Maybe I didn’t explain it the right way. I opened another topic meanwhile with more information about my configuration and problem.  
Maybe you might like to have a look at it:

> [@Channel\_layout / Mixing / Mapping / 16ch out of 2](https://casparcgforum.org/t/channel-layout-mixing-mapping-16ch-out-of-2/4877):
>
> Hello again, after a while I’m coming back to the forum with a problem I cannot solve. Maybe my understanding of the concept of channel\_layout is wrong. What I try to achieve: I need a decklink output that always contains audio on 16 channels. The output could either be a video from an input channel that already contains 16 channels or an audio only from a wav- or aac-file. The problem is that I need to “copy” the audio tracks 1 and 2 to all 16 channels. While I’m using server 2.1.11 NRK bra…

Thanks.  
Ingo

---

<div class="post-metadata">

**Author:** ![vimlesh1975](https://casparcgforum.org/user_avatar/casparcgforum.org/vimlesh1975/32/1608_2.png) [@vimlesh1975](https://casparcgforum.org/u/vimlesh1975)\
**Post date:** [May 20, 2022, 9:39am UTC](https://casparcgforum.org/t/mono-sound-out/3950/9 "2022-05-20T09:39:39Z")

</div>

Pl give your pc on remote to me in private message. I will setup.

---

<div class="post-metadata">

**Author:** ![Ingo](https://casparcgforum.org/user_avatar/casparcgforum.org/ingo/32/1419_2.png) [@Ingo](https://casparcgforum.org/u/Ingo)\
**Post date:** [May 20, 2022, 10:35am UTC](https://casparcgforum.org/t/mono-sound-out/3950/10 "2022-05-20T10:35:00Z")

</div>

Hi vimlesh,  
That’s very kind. But I’m sorry.  
My company does not allow any remote access.  
Can’t do that.

I only can give you my config for modifications:

```auto
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <paths>
    <media-path>D:/CasparCG/_media/</media-path>
    <log-path>D:/CasparCG/_log/</log-path>
    <data-path>D:/CasparCG/_data/</data-path>
    <template-path>D:/CasparCG/_templates/</template-path>
    <thumbnail-path>D:/CasparCG/_thumbnails/</thumbnail-path>
  </paths>
  <log-level>info</log-level>
    <accelerator>auto</accelerator>
  <flash>
    <buffer-depth>auto</buffer-depth>
  </flash>
  <html>
    <remote-debugging-port>0</remote-debugging-port>
    <enable-gpu>true</enable-gpu>
  </html>
  <thumbnails>
    <generate-thumbnails>true</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>1080i5000</video-mode>
    <mipmap>true</mipmap>
  </thumbnails>
  <channel-grid>false</channel-grid>
  <channels>
    <channel>
        <video-mode>1080i5000</video-mode>
	    <channel-layout>16ch</channel-layout>
        <straight-alpha-output>false</straight-alpha-output>
	  <consumers>
             <decklink>
                <device>5</device>
                <embedded-audio>true</embedded-audio>
                <channel-layout>16ch</channel-layout>
                <latency>normal</latency>
                <keyer>default</keyer>
                <key-only>false</key-only>
                <buffer-depth>3</buffer-depth>
            </decklink>
        </consumers>		
	</channel>
	<channel>
        <video-mode>1080i5000</video-mode>
		<channel-layout>16ch</channel-layout>
        <straight-alpha-output>false</straight-alpha-output>
	  <consumers>
	           <decklink>
                <device>6</device>
                <embedded-audio>true</embedded-audio>
                <channel-layout>16ch</channel-layout>
                <latency>normal</latency>
                <keyer>default</keyer>
                <key-only>false</key-only>
                <buffer-depth>3</buffer-depth>
            </decklink>
        </consumers>		
	</channel>
	<channel>
        <video-mode>1080i5000</video-mode>
		<channel-layout>16ch</channel-layout>
        <straight-alpha-output>false</straight-alpha-output>
	  <consumers>
           <decklink>
                <device>7</device>
                <embedded-audio>true</embedded-audio>
                <channel-layout>16ch</channel-layout>
                <latency>normal</latency>
                <keyer>default</keyer>
                <key-only>false</key-only>
                <buffer-depth>3</buffer-depth>
            </decklink>
          </consumers>		
	</channel>
	<channel>
        <video-mode>1080i5000</video-mode>
		<channel-layout>16ch</channel-layout>
        <straight-alpha-output>false</straight-alpha-output>
	  <consumers>
          <decklink>
                <device>8</device>
                <embedded-audio>true</embedded-audio>
                <channel-layout>16ch</channel-layout>
                <latency>normal</latency>
                <keyer>default</keyer>
                <key-only>false</key-only>
                <buffer-depth>3</buffer-depth>
            </decklink>
         </consumers>		
	</channel>
</channels>
  <controllers>
    <tcp>
        <port>5250</port>
        <protocol>AMCP</protocol>
    </tcp>
	<tcp>
      <port>3250</port>
      <protocol>LOG</protocol>
    </tcp>
  </controllers>
  	<amcp>
        <media-server>
            <host>127.0.0.1</host>
            <port>8000</port>
        </media-server>
    </amcp>
	<osc>
		<default-port>6250</default-port>
		<predefined-clients>
			<predefined-client>
				<address>127.0.0.1</address>
				<port>6250</port>
			</predefined-client>
		</predefined-clients>
	</osc>
<audio>
  <channel-layouts>
	<channel-layout name="16ch" type="16ch" num-channels="16"/>	
	<channel-layout name="dubbed" type="multi" num-channels="16" channel-order="FL FR FL FR FL FR FL FR FL FR FL FR FL FR FL FR"/>	
  </channel-layouts>
 	<mix-configs>
		<mix-config from-type="multi" to-types="16ch" mix="FL = FL | FR = FR" />
	</mix-configs>
</audio>
</configuration>

```

Cheers

Ingo

---

<div class="post-metadata">

**Author:** ![vimlesh1975](https://casparcgforum.org/user_avatar/casparcgforum.org/vimlesh1975/32/1608_2.png) [@vimlesh1975](https://casparcgforum.org/u/vimlesh1975)\
**Post date:** [May 20, 2022, 10:43am UTC](https://casparcgforum.org/t/mono-sound-out/3950/11 "2022-05-20T10:43:20Z")

</div>

> [@Ingo](#):
>
> I got a server error message when I try to send  
> `play 1-1 go1080p25`

This will give error only when you dont have file go1080p25.  
My given config file will surely work . I have tested it on my pc.

---

<div class="post-metadata">

**Author:** ![Ingo](https://casparcgforum.org/user_avatar/casparcgforum.org/ingo/32/1419_2.png) [@Ingo](https://casparcgforum.org/u/Ingo)\
**Post date:** [May 20, 2022, 12:03pm UTC](https://casparcgforum.org/t/mono-sound-out/3950/12 "2022-05-20T12:03:25Z")

</div>

OK.  
I’m getting a step closer. I used your config and now get all channels when I check via OSC server but don’t get any real output at the blackmagic output.  
It could be that there is a flaw in my client programming. I’m using mixer commands with my client. Maybe this “undermines” the settings of the config file. I’ll have to check this next.  
Thanks very much so far. 😀

Ingo

---

<div class="post-metadata">

**Author:** ![Ingo](https://casparcgforum.org/user_avatar/casparcgforum.org/ingo/32/1419_2.png) [@Ingo](https://casparcgforum.org/u/Ingo)\
**Post date:** [May 20, 2022, 12:32pm UTC](https://casparcgforum.org/t/mono-sound-out/3950/13 "2022-05-20T12:32:17Z")

</div>

Hi vimlesh,

It works! Thanks very much!  
The problem still lied in the config. I set the channel\_layout of the output to “16ch”. That didn’t work. But setting them to “dubbed” as well works fine.  
You were a really great help! 😀

Here my working config for anyone who’s interested:

```auto
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <paths>
    <media-path>D:/CasparCG/_media/</media-path>
    <log-path>D:/CasparCG/_log/</log-path>
    <data-path>D:/CasparCG/_data/</data-path>
    <template-path>D:/CasparCG/_templates/</template-path>
    <thumbnail-path>D:/CasparCG/_thumbnails/</thumbnail-path>
  </paths>
  <log-level>info</log-level>
    <accelerator>auto</accelerator>
  <flash>
    <buffer-depth>auto</buffer-depth>
  </flash>
  <html>
    <remote-debugging-port>0</remote-debugging-port>
    <enable-gpu>true</enable-gpu>
  </html>
  <thumbnails>
    <generate-thumbnails>true</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>1080i5000</video-mode>
    <mipmap>true</mipmap>
  </thumbnails>
  <channel-grid>false</channel-grid>
  <channels>
    <channel>
        <video-mode>1080i5000</video-mode>
	    <channel-layout>16audio</channel-layout>
        <straight-alpha-output>false</straight-alpha-output>
	  <consumers>
             <decklink>
                <device>5</device>
                <embedded-audio>true</embedded-audio>
                <channel-layout>16audio</channel-layout>
                <latency>normal</latency>
                <keyer>default</keyer>
                <key-only>false</key-only>
                <buffer-depth>3</buffer-depth>
            </decklink>
        </consumers>		
	</channel>
	<channel>
        <video-mode>1080i5000</video-mode>
		<channel-layout>16audio</channel-layout>
        <straight-alpha-output>false</straight-alpha-output>
	  <consumers>
	           <decklink>
                <device>6</device>
                <embedded-audio>true</embedded-audio>
                <channel-layout>16audio</channel-layout>
                <latency>normal</latency>
                <keyer>default</keyer>
                <key-only>false</key-only>
                <buffer-depth>3</buffer-depth>
            </decklink>
        </consumers>		
	</channel>
	<channel>
        <video-mode>1080i5000</video-mode>
		<channel-layout>16audio</channel-layout>
        <straight-alpha-output>false</straight-alpha-output>
	  <consumers>
           <decklink>
                <device>7</device>
                <embedded-audio>true</embedded-audio>
                <channel-layout>16audio</channel-layout>
                <latency>normal</latency>
                <keyer>default</keyer>
                <key-only>false</key-only>
                <buffer-depth>3</buffer-depth>
            </decklink>
          </consumers>		
	</channel>
	<channel>
        <video-mode>1080i5000</video-mode>
		<channel-layout>16audio</channel-layout>
        <straight-alpha-output>false</straight-alpha-output>
	  <consumers>
          <decklink>
                <device>8</device>
                <embedded-audio>true</embedded-audio>
                <channel-layout>16audio</channel-layout>
                <latency>normal</latency>
                <keyer>default</keyer>
                <key-only>false</key-only>
                <buffer-depth>3</buffer-depth>
            </decklink>
         </consumers>		
	</channel>
</channels>
  <controllers>
    <tcp>
        <port>5250</port>
        <protocol>AMCP</protocol>
    </tcp>
	<tcp>
      <port>3250</port>
      <protocol>LOG</protocol>
    </tcp>
  </controllers>
  	<amcp>
        <media-server>
            <host>127.0.0.1</host>
            <port>8000</port>
        </media-server>
    </amcp>
	<osc>
		<default-port>6250</default-port>
		<predefined-clients>
			<predefined-client>
				<address>127.0.0.1</address>
				<port>6250</port>
			</predefined-client>
		</predefined-clients>
	</osc>
<audio>
<channel-layouts>
<channel-layout name="dubbed" type="multi" num-channels="2" channel-order="FL FR" />
<channel-layout name="16audio" type="16ch" num-channels="16" channel-order="FL FR FL FR FL FR FL FR FL FR FL FR FL FR FL FR" />
</channel-layouts>

<mix-configs>
<mix-config from-type="multi" to-types="16ch" mix="FL=FL | FR=FR" />	
</mix-configs>

</audio>
</configuration>

```

---

<div class="post-metadata">

**Author:** ![xdecodex](https://casparcgforum.org/letter_avatar_proxy/v4/letter/x/db5fbb/32.png) [@xdecodex](https://casparcgforum.org/u/xdecodex)\
**Post date:** [January 20, 2023, 7:51am UTC](https://casparcgforum.org/t/mono-sound-out/3950/14 "2023-01-20T07:51:40Z")

</div>

hi vimlesh, I’m running 2.3.2 server and plycast client, how can I make mono out on this?