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hzeller / gmrender-resurrect

Resource efficient UPnP/DLNA renderer, optimal for Raspberry Pi, CuBox or a general MediaServer. Fork of GMediaRenderer to add some features to make it usable.
GNU General Public License v2.0
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Strange pulsing tone #6

Open LeePorte opened 11 years ago

LeePorte commented 11 years ago

Hi,

After some more testing today, I'm noticing a strange pulsing tone in the background. This is not there until I play a track through gmrender via ALSA or Pulse over USB into my DAC. Pausing the audio stream makes it easier to hear. If I restart gmrender then it kills the tone, only for it to reappear on playing audio.

I'm not finding the same issue with Mplayer into ALSA or Pulse into the DAC.

Any thoughts?

Edit:

I've also checked gstreamer via playbin with the following command "gst-launch-1.0 playbin uri=file:///path/to/file" this was output without any issue via both ALSA and Pulseaudio.

Cheers L

hzeller commented 11 years ago

I don't know what causes this particular pulsing. What is the platform you're using (Linux distribution and architecture) and the external sound card ? I guess there are many reasons things could go wrong, but this might help drilling down to it.

LeePorte commented 11 years ago

It's a really odd one.

I'm using Raspbian (Ras Pi official OS) on ARM-HF. The sound card is a Cambridge Audio DAC Magic. It's a C-Media chipset feeding the Wolfson DACs directly.

I'll put the exact chipsets for you. I'll also try to get a recording of the pulsing.

blackbicbiro commented 11 years ago

Check that its not a crappy powersupply. I had a cheap powersupply that made alot of noise. I changed it out with a PSU that had good filtering and my pulsing went. the pulsing i got was about 50hz (funny enough the same a uk main frequency)

edit: sorry i have just assumed that you where using a raspberry pi. if not ignore me completely