[mythtv-users] stuttering and staggering recordings

WagnerOne wagner at wagnerone.com
Mon Feb 11 18:58:11 UTC 2008


My mythtv box is a single front/back end on a Ubuntu 7.10 system. All  
my myth packages are listed as version 0.20.2-0ubuntu10.1.

Linux tatooine 2.6.22-14-generic #1 SMP Tue Dec 18 08:02:57 UTC 2007  
i686 GNU/Linux

I'm using the motherboard audio hardware:

00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER  
(ICH5/ICH5R) AC'97 Audio Controller (rev 02)

and a single pcHDTV HD-5500 for my capture device.

At the present, I have my analog coax cable plugged into the coax  
input on the HD-5500 and am using it to record analog SD TV only.

About 1/10 of the time I record a program or view live TV, the video  
and audio streams stuttering to the point the viewing/recording is  
pointless. The video and audio stuttering seems to be in sync FWIW.

If this happens when attempting to view live TV, exiting and  
immediately going to live TV again will correct the problem. Of  
course, if it happens while recording, I just have to hope the program  
will be on again for a 2nd recording attempt.

I've spent a good deal of time troubleshooting this issue and have  
made no progress. I've researched ALSA, VFL and DVB drivers, searched  
the web for the errors I see in the system logs when this happens, and  
physically moved the HD-5500 to another PCI slot for kicks... all to  
no avail.

At this point I'm pretty convinced I have an ALSA driver issue related  
to either the on-board audio hardware or the HD-5500, a V4L/DVB driver  
problem with the HD-5500 itself or configuration issue within Mythtv.

The one thing I'll throw in here before I ask for what details I can  
provide to best troubleshoot is the output to my syslog when this  
stuttering thing happens:


1 Time(s): [174280.617511] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [174280.636123] cx88[0]: irq aud [0x1101] dn_risci1* dnf_of  
dn_sync*
1 Time(s): [177267.170212] cx88[0]: irq aud [0x201001] dn_risci1*  
dn_sync* mchg_irq
1 Time(s): [177267.170234] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170249] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170262] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170273] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170287] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170299] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170312] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170326] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170343] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177267.170352] cx88[0]/1: clearing mask
1 Time(s): [177267.236356] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*
1 Time(s): [177274.475260] cx88[0]: irq aud [0x1001] dn_risci1* dn_sync*


Thanks,
Mike


-- 
wagner at wagnerone.com
"The advantage of a bad memory is that one enjoys several times the  
same good things for the first time."-Nietzsche




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