[mythtv-users] Software encoders question

[Harry Devine]

Harry Devine wrote:
> Brad DerManouelian wrote:
>   
>> On Jul 3, 2008, at 1:15 PM, Harry Devine wrote:
>>
>>   
>>     
>>> I'd like to know what the difference is between the Default, LiveTV,
>>> High Quality, and Low Quality software decoders is in Myth 0.21 (under
>>> Utilities/Setup->Setup->TV Settings->Recording Profiles->Software
>>> Encoders (v4l based).  I recorded the minisode of "Rescue Me" the  
>>> other
>>> night on FX and when I try to play it back, it looks like crap.  I  
>>> don't
>>> know how else to explain it except that the video is extremely jumpy  
>>> and
>>> choppy, and the audio is very staticy.
>>>
>>> Any recording that I make using the analog portion of my pcHD5500 card
>>> does this.  FWIW, I use the Default profile for everything.  And all  
>>> of
>>> the recordings that I make using the Digital (DVB) portion of that  
>>> card
>>> or my Firewire capture playback fine.
>>>
>>> Any ideas on what I can look at to figure out how to clean this up?
>>>     
>>>       
>> Try recording outside of Myth and see what your video looks like. If  
>> that looks like crap, you know you don't need to look at any Myth  
>> settings to fix it. At that point it would be something in the driver.  
>> a simple cat /dev/video > tempfile would work. Play it back with  
>> mplayer and see your results.
>>
>> If that looks ok, modify your default settings (since that's what you  
>> said you use to record) and kick up the bitrates until you see  
>> acceptable results.
>>
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>>   
>>     
> When I try that, I get "cat: /dev/video: Input/output error".  I've also 
> noticed that when I try to tune a channel on the analog portion, I get 
> the exact same situation.  Tuning to an analog station using TVTime 
> (which I know used to work) tunes the channel for about 1 second then 
> switches to a blue background with "No Signal" on it.  I did a "tail -f 
> /var/log/messages" and saw the following in there for the analog tunes 
> (cx88 is the driver for my pcHD5500 card if I remember correctly):
>
> Jul  4 20:25:26 HJDMyth kernel: cx88[0]/0: [ffff810032c2ae00/3] timeout 
> - dma=0x 0c7ac000
> Jul  4 20:25:26 HJDMyth kernel: cx88[0]/0: [ffff810032c2a000/4] timeout 
> - dma=0x 21d12000
> Jul  4 20:25:26 HJDMyth kernel: cx88[0]/0: [ffff810032c2a200/0] timeout 
> - dma=0x 23226000
> Jul  4 20:25:26 HJDMyth kernel: cx88[0]/0: [ffff810032c2a600/1] timeout 
> - dma=0x 2335c000
> Jul  4 20:25:26 HJDMyth kernel: cx88[0]/0: [ffff810032c2aa00/2] timeout 
> - dma=0x 22d5e000
>
>
> I'm starting to think that this is a driver issue, but which one?  The 
> v4l one?  How do I find what I have and if there's an update for it?
>
> Thanks for the help!
> Harry
>
>
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>   
OK, so I've gotten side-tracked for a few weeks on this, but now I've 
decided to give it another shot.  Any ideas on this?  I tried the steps 
again this evening with the same results listed above.  I can't figure 
out what could be going on here.  I know that before I upgraded my box 
from FC6 to F8, this worked, so I'm assuming that its a kernel issue.  
I'm running kernel 2.6.24.5-85.fc8 if that helps.

Anyone?
Harry