[AudioI] Issues with Audio Injector Stereo and various versions of Raspberry Pi

[Matt]

Great!

Can OpenOB allow people to use a smart speaker to listen to an audio 
stream from the Pi running the Audio Injector sound card ?

On 26/2/21 2:28 pm, Terry O'Connor wrote:
> Hi Matt
>
> Yep removing the Pulse Audio package fixed the issue.  All of the Stereo Sound Cards are working on Pi 4 platform.
>
> The Zero Sound Card was giving similar problems as  well and now all is good and working.  The big challenge was to make sure this was all working with OpenOB and open source stereo audio over IP link package.
>
> Audio Injector is a preferred sound device for using with OpenOB when run on the Pi.
>
>
> Regards
>
> Terry O'Connor
>
>> On 26 Feb 2021, at 11:43 am, Matt <matt at audioinjector.net> wrote:
>>
>> I'm having a go at this. I can see that RaspbianOS has a new default alsa setup - they do tend to get very creative with audio in a non-robust fashion! When I look at alsamixer, I can see that they have setup an arbitrary sound card as the default - that will not work for us.
>>
>> I start alsamixer from the command line, select the audio injector card by pressing "F6" and using the arrow keys.
>>
>> I then enable the "Output Mixer HiFi" setting.
>>
>> I then play and can hear the audio through the headphones.
>>
>> Does this help you at all ?
>>
>>
>> Another way to do this is to use amixer like so :
>>
>> amixer -Dhw:0 sset 'Output Mixer HiFi' on
>>
>>
>> Here is how I replicated this problem I saw ...
>>
>> I have a Pi 4, with the latest "Raspberry Pi OS with desktop" v5.4, Jan 11th 2021.
>>
>> Wrote to an sdcard. created an empty file /boot/ssh.
>>
>> Copy my key to the pi : ssh-copy-id pi at raspberrypi.local
>> ssh to the pi : ssh pi at raspberrypi.local
>>
>> Following the manual setup method from here :
>>
>> https://github.com/Audio-Injector/stereo-and-zero
>>
>> I didn't run rpi-update as it is a recent os.
>>
>> Rebooted.
>>
>> Installed sox :
>>
>> sudo apt install libsox-fmt-all sox
>>
>> Got an audio file and converted it to wav :
>>
>> wget https://ogg.jamendo.com/download/track/206407/ogg1/ -O audio.ogg
>>
>> sox audio.ogg audio.wav
>>
>> alsamixer # chose the non default soundcard and enabled the "output mixer hifi" control.
>>
>> aplay audio.wav
>>
>> now it works !
>>
>> On 26/2/21 10:31 am, Terry O'Connor via People wrote:
>>> Hi guys
>>>
>>> I am have some serious issues with 3 stereo sound cards.  Now all 3 cards work when connected to a Raspberry Pi model 2B, no problems.
>>>
>>> However, when i attempt to use the same cards on a Raspberry 3B+ or a Raspberry Pi 4 or Pi 400 only one of the cards work. One of the cards is not event recognised when I issue the play -l command.  The second card is recognised and I can get audio to passthrough from input to output but audacity does not see any audio input when I have selected the stereo card as the input device.
>>>
>>> There is obviously something different between the Pi2 and the Pi 3B+ and Pi4 as it is only the hardware that is different.
>>>
>>> Any ideas as to why I am seeing the behaviour.  It is important that I get some resolution on this as I am with a group that is looking at using these cards with the Pi4 for a community radio OB unit project.
>>>
>>>
>>> Regards
>>>
>>>
>>> Terry O'Connor
>>>
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