[mythtv-users] Sudden audio problem

Mike Carron jmcarron at starstream.net
Mon Mar 3 00:37:53 UTC 2014

On 3/1/2014 9:07 AM, Hika van den Hoven wrote:
> Hoi Mike,
> Saturday, March 1, 2014, 5:48:46 PM, you wrote:
> 	Ok, I tried it this morning after everything had been off for at 
> least 12 hours, the sound came on properly and lasted about 30 
> minutes. When it died, the settings still pointed to ALSA:hdmi card 0 
> and a speaker test was successful. I exited the FE and checked 
> alsamixer which showed the correct settings and was not muted. I 
> restarted the FE and the sound was correct and lasted for about 20 
> minutes. When it went out I checked the settings, still ALSA:HDMI card 
> 0, speaker test was still successful, and after exiting the FE, 
> alsamixer showed the sound was not muted. This time when I restarted 
> the FE, there was no sound.
> I'm beginning to suspect a hardware issue, especially since an 
> identical AD-03 in a different room but connecting to the same BE has 
> delivered proper sound with no problems.
> mike
> On 2/28/2014 10:38 PM, Jean-Yves Avenard wrote:
> On Saturday, March 1, 2014, Mike Carron <jmcarron at starstream.net 
> <mailto:jmcarron at starstream.net>> wrote:
> After several months of normal operation, one FE (a Zotac ZBOX AD-03 
> with Mythbuntu 12.04 0.25/fixes) suddenly dropped sound completely 
> while watching live tv. Checking the log produced 4 errors together at 
> the time when the sound was dropped:
> ALSA: Setting hardware audio buffer size to 128
> ALSA: Error opening /proc/asound/card0/pcm3p/suub0/prealloc: 
> Permission denied.
> ALSA: Try to manually increase audio buffer with: echo 128 | sudo tee 
> /proc/asound/card0/pcm3p/sub0/prealloc
> ALSA: Unable to sufficiently increase ALSA hardware buffer size - 
> underruns are likely
> I can restart the FE and the same scenario will repeat, some amount of 
> time with completely normal sound followed by silence. Those 4 items 
> will be in the log at the exact time the sound fails.
> If someone is familiar with this situation and can offer suggestions 
> that would be great.
> Those messages are harmless. You can ignore them.
> Make sure the audio device didn't change in the settings, and that 
> it's not muted using the alsa-mixer utility
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> It can also be an issue on your backend. Check if old recordings, you 
> know to contain sound, produce sound.
> Also you can check if the files that failed to produce sound, do 
> contain sound by playing them in another context.
> If not the problem is probably either with your hardware (the encoder 
> of your card) or with your encoding profile
> or the encoding software.
> Tot mails,
>   Hika mailto:hikavdh at gmail.com
I picked a recording where the sound went quiet, bookmarked the spot and 
resumed play on another identical machine, perfect sound. Neither the 
profile nor the software has changed. I've been looking for an excuse to 
use a machine with Nvidia  instead of ATI graphics anyway.;-)


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