Is it possible to use system audio as producer?

General
1

Hi,
I need to add individual audio to one channel, some from System Audio, some from line in (mixer–>computer line in), I don’t find a producer for system audio, is it possible, or any workaround for this?
This is used for live stream, all audio source are from micphones–>mixer–>computer line in
Thanks.

2

I use html with js to input audio from the computer line in ，you can try this web audio api

3

I just found that FFMpeg can handle system audio using dshow, but not sure if it is supported in CCG, need some test
I use this command , but not seeing my line in on the list
ffmpeg -list_devices true -f dshow -i dummy

4

play 1-1 dshow://audio="@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{DD1BBD40-C805-4AE1-B62D-C7F7FBE79C71}"

tested, and failed…
got errors

5

DShow sure used to work in older versions… but it may need a video device as primary input?

And something to keep in mind is that CasparCG can be pretty picky on where you put double quotes. Maybe try

play 1-1 "dshow://audio=\"@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{DD1BBD40-C805-4AE1-B62D-C7F7FBE79C71}\""

6

the reason I used device location instead of name is that my device are in Chinese which will be show as ???, seems not supported well

then I found that I can edit this name, so I tested again with English device name, it works

play 1-1 “dshow://audio=Line In (Realtek High Definition Audio)”

but I got a new problem
I add system sound output for sound monitor
I speak to the microphone, and then I hear my voice after like 1.5 seconds
Do you have any idea how to fix this delay problem

7

tested ffplay to play line in, same latency, so it’s not the problem of CCG

anyone have ideas to play system audio in CCG? thanks.

8

NDI Scan converter?

9

rrebuffo has a point, but my sugestion is just a different software OBS.
Audio in and mixed in OBS and output as a NDI