Current version of the OpenAuto Pro is 7.0
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Camera is active, no audio
#1
Hi there,

I have some audio problems.

When the rear view camera is active (manual or automatic), the sound suddenly goes away until the window is closed.

I suspect that this is the Cinch to USB adapter, because if I disconnect it from USB, the error is gone.

This has 2 audio inputs (L + R) and a video input.

Raspbian keeps showing a crossed out speaker.

How can I fix the error?

A new flashing of OAP 5 did nothing.

My hardware:

• USB sound card (Speedlink Vigo)
• Video adapter (CSL - USB High Speed Videograbber)
• USB microphone (Mikrofon iGOKU USB Mikrofon)
• Raspberry 3b+
#2
What power supply do you use? It might be USB voltage drop after camera device activation that leads to disconnection of other USB devices (e.g. sound card).
#3
The camera is directly connected to 12V, the rest of the devices are connected to an active USB hub.

The devices are somehow not disconnected because if I close the camera window, but all devices are still connected, it will work again until the camera window is opened.

As long as the video adapter is connected, my USB microphone is not recognized.

A car adapter (12V to 5V) is used.
Same error with the official Raspberry power supply (5.1V / 2.5A)
#4
I have now tried with a webcam, same problem here.

welle.io loses reception and at e.g. Android Auto, the sound becomes very distorted and slowed down.
#5
Does anyone know what the problem is?
#6
(01-18-2020, 10:43 AM)Rootinator Wrote: I have now tried with a webcam, same problem here.

welle.io loses reception and at e.g. Android Auto, the sound becomes very distorted and slowed down.

Looks like you reach the limit of PI's USB throughput. SDR dongles and webcams are bandwith killers, especially when they are connected through single USB port (e.g. via USB hub). You can try to rearrange your USB devices connections - connect SDR dongle via active hub and rest devices directly to the PI. Have you considered migration to PI4? It has USB 3.0 controller which should be more powerful.
#7
Many thanks for your response! Smile

I think you are right that the throughput of my devices is too high for the RPi 3b+.
It's just strange that the problem persists on the RPi 3b+, even if all devices are connected directly without a hub.

With an RPi 4b there are currently no problems. Not even with a USB hub.

Thanks for the information with the throughput, I did not think about this error!


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