[mythtv-users] ivtv0 warning: encoder VBI: Couldn't find start of buffer within the first 256 bytes

[David Kramer]

matt stone wrote:
> On 8/9/07, David Kramer <david at thekramers.net> wrote:
>> I get this message hundreds of times all throughout /var/log/messages:
>>
>>   kernel: ivtv0 warning: encoder VBI: Couldn't find start of buffer
>> within the first 256 bytes
>>
>> I also get:
>>
>> kernel: ivtv0: All encoder VBI stream buffers are full. Dropping data.
>> kernel: ivtv0: Cause: the application is not reading fast enough.
>>
>> Is my CPU simply too slow?
>> Is the hard drive too slow?
>> Is there's some buffer that's too small that I can tweak?
>>
> <Snipped>
>> ivtv0: Autodetected Hauppauge card (cx23415 based)
>> ivtv0: Unreasonably low latency timer, setting to 64 (was 32)
> 
> You might want to read the wiki article on adjusting pci latency
> http://www.mythtv.org/wiki/index.php/PCI_Latency


Excellent!  Google didn't find this page.  I probably put in too much of 
the error message in quotes.

The author does warn about setting it so high that it can't write to the 
hard drive, so I might start out with a lower number than his 176, but 
this sounds like what I need.  Thanks.