Different audio devices for different channels

[realwarlok]

Description

Ability to select different audio outputs (device and out) for each channel.
It is very important to use different channels to output for example SFX and PLAYOUT.

For now only system audio workling and its not flexible at all.

Solution suggestion

No response

[dedicatedbroadcastsolutions]

Can you please elaborate more about the setup you want to do this with? Channel audio is normally embedded with the SDI outputs on a decklink card for most applications. This will give you separate audio outputs dedicated to each channel. If you run SFX and PLAYOUT on separate channels, they would each have separate audio on their respective SDI outputs. You can then create a third channel with the correct routing and outputs to accomplish the overlay or do that with external gear. Are you using the screen consumer and HDMI outputs?

[realwarlok]

@dedicatedbroadcastsolutions

Here is scheme in attachment.

If we using SDI embedded audio -- we need to use de-embedders for each layer, instead of one multichannel soundcard.

[premultiply]

The thing is that the audio of a SDI channel is always sync-locked to the its video.

If you use "external" output devices they all have their own clock reference (if not synced somehow externally). Screen consumer is the worst as it nearly always has its own free-running clock and also unlocked framerate.

[dedicatedbroadcastsolutions]

For this setup you will need to apply the correct delay in your sound mastering desk, but you probably can do that already with any digital desk. Maintaining audio sync requires a reference that is consistent and doesn't drift. Preventing drift is easier in external hardware solutions unless you have some sort of sync clock between the soundcard word clock and decklink output. Because of that I would recommend accomplishing this external to CasparCG unless you have the appropriate master clock hardware. I have successfully run digital mixing consoles without tying word clock to the video clock though and haven't experienced significant drift in an event production environment.

You have several options here.

1. Set up an SDI de-embedder for each output and route to sound mixing. (used teranex mini SDI to HDMI or SDI to Audio work great for analog or AES de-embed)
2. Get an SDI de-embedder card for your sound mastering desk
3. Use a D21m SDI de-embedder to MADI converter using the Studer Remote Rack system (I have the hardware available for sale for this if you are interested)
4. Upgrade to a model of ATEM that has MADI direct outputs such as the 4 M/E or above. This gives the sound desk the first two channels from all inputs of the ATEM.
5. Set up a Midi control surface near the sound console to give your sound engineer control the internal ATEM sound mixer.
6. Fund a developer to add a soundcard output device that allows you to pick the sound card output for each channel. System audio requires you to set the device in your OS which won't accommodate separate channels like you require.

If you are looking for a paid solution I can help connect you with what you need for any of these options unless another developer volunteers to help with this feature.