# Channel\_layout / Mixing / Mapping / 16ch out of 2 **URL:** \ **Category:** General\ **Created:** [May 19, 2022, 11:33am UTC](https://casparcgforum.org/t/channel-layout-mixing-mapping-16ch-out-of-2/4877 "2022-05-19T11:33:03Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Ingo](https://casparcgforum.org/user_avatar/casparcgforum.org/ingo/32/1419_2.png) [@Ingo](https://casparcgforum.org/u/Ingo)\ **Post date:** [May 19, 2022, 11:33am UTC](https://casparcgforum.org/t/channel-layout-mixing-mapping-16ch-out-of-2/4877/1 "2022-05-19T11:33:03Z")
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 branch I thought I could manage that via the mixer in the config file. So I established a channel\_layout “dubbed” which I call everytime I play a (audio- or video-)file that contains only two audio channels: > LOADBG 1-9 “CASTLES720” FORMAT 1080i5000 CHANNEL\_LAYOUT “dubbed” LOOP MIX 12 > PLAY 1-9 The entry in the config file section is as follows: ```auto ``` So I thought whenever I call then channel\_layout “dubbed” the mixer gets the two available channels and maps them to all 16 channels. Unfortunately I have absolutely no audio on any channel when I call this channel\_layout. All muted. Can anyone lead me to the right track here. I think I don’t get the idea of audio mixing and mapping right here. Thanks. Ingo Here’s my complete config file: ```auto D:/CasparCG/_media/ D:/CasparCG/_log/ D:/CasparCG/_data/ D:/CasparCG/_templates/ D:/CasparCG/_thumbnails/ info auto auto 0 true true 256 144 2 5000 2000 1080i5000 true false 1080i5000 16ch false 5 true 16ch normal default false 3 1080i5000 16ch false 6 true 16ch normal default false 3 1080i5000 16ch false 7 true 16ch normal default false 3 1080i5000 16ch false 8 true 16ch normal default false 3 5250 AMCP 3250 LOG 127.0.0.1 8000 6250
127.0.0.1
6250 ``` ---
**Author:** ![frozen](https://casparcgforum.org/letter_avatar_proxy/v4/letter/f/9fc29f/32.png) [@frozen](https://casparcgforum.org/u/frozen)\ **Post date:** [May 20, 2022, 10:50am UTC](https://casparcgforum.org/t/channel-layout-mixing-mapping-16ch-out-of-2/4877/2 "2022-05-20T10:50:12Z")
Hi, I haven’t tested this but you might need to put some channel order on your 16ch layout ```auto ``` and then in your mix config from multi to 16ch, `` Not tested so sorry if that is a waste of time. I think if you added a channel-order of just FL FR to 16ch you would lose the ability to playout true 16ch content, so you will need only 2 channel content to be mapped to the 0…15 order. I hope that works for you and again sorry if it doesn’t. ---
**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, 11:56am UTC](https://casparcgforum.org/t/channel-layout-mixing-mapping-16ch-out-of-2/4877/3 "2022-05-20T11:56:54Z")
Hi frozen, Thanks for your suggestion. Unfortunately it doesn’t work that way. Ingo ---
**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, 12:34pm UTC](https://casparcgforum.org/t/channel-layout-mixing-mapping-16ch-out-of-2/4877/4 "2022-05-20T12:34:15Z")
Hello, Thanks for the help. 😀 Thanks to vimlesh I could solve the issue by configuring as follows: ```auto D:/CasparCG/_media/ D:/CasparCG/_log/ D:/CasparCG/_data/ D:/CasparCG/_templates/ D:/CasparCG/_thumbnails/ info auto auto 0 true true 256 144 2 5000 2000 1080i5000 true false 1080i5000 16audio false 5 true 16audio normal default false 3 1080i5000 16audio false 6 true 16audio normal default false 3 1080i5000 16audio false 7 true 16audio normal default false 3 1080i5000 16audio false 8 true 16audio normal default false 3 5250 AMCP 3250 LOG 127.0.0.1 8000 6250
127.0.0.1
6250 ``` Cheers Ingo