[mythtvnz] Choppy audio on DVB-T

[Håkon Alstadheim]

I'm running myth from 
<http://ppa.launchpad.net/paul-kcbbs/ubuntu/pool/main/m/mythtv/>, and 
I'm sort of getting used to the quirks (really looking forward to 
getting this integrated into the official tree thouth). One annoyance 
I'd put high on the list is a choppiness in the audio on DVB-T 
programmes. Most of the time audio is fine, but audio drops out when 
there is little/nothing happening on the screen. 5-10 seconds befor a 
still image, audio will start breaking up. How can that be, LOW bitrate 
== audio dropout ? I'v set up the box to give highest priority to 
mplayer, could it be that lower cpu-usage in myth == higher latency for 
the little work that needs to be done ? The Cpu is ~ 70% idle during the 
time the log below was taken. I'm pretty sure nothing is messing with 
the CPU frequency or powersaving.

Audio- only broadcasts get appx. 1/3 second drop-out every 5-50 seconds. 
The recordings usually play fine in mplayer, though the same thing 
happens occasionaly there too. Here is a few seconds of the log from the 
frontend:

2009-01-10 16:04:20.719 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:21.319 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:21.959 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:22.599 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:23.280 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:23.879 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
'video_output' mean = '39999.17', std. dev. = '992.16', fps = '25.00'
2009-01-10 16:04:24.519 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:25.200 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:25.799 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:26.479 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:27.079 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:27.719 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
'video_output' mean = '39997.81', std. dev. = '419.86', fps = '25.00'
2009-01-10 16:04:28.359 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:28.999 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:29.639 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:30.319 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:30.961 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:31.559 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:32.239 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
'video_output' mean = '40005.10', std. dev. = '351.62', fps = '25.00'
2009-01-10 16:04:32.879 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:33.478 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:34.199 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:34.759 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!
2009-01-10 16:04:35.399 NVP::AddAudioData():p1: Audio buffer overflow, 
audio data lost!


-- 
Håkon Alstadheim
47 35 39 38