[mythtv-users] tuning two-card systems ?

[Michael J. Lynch]

Adam Felson wrote:

>>Hi,
>>    
>>
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>  
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>>I just managed to build my two-card (bttv cards!) system.  It works
>>fine I guess, when recording two channels it is 0% idle, but still
>>everything appears to get to disk just fine for now.  I've seen no
>>jerking or hiccups or artifacts.  More on that setup below. First my
>>problem...:
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>You're still misreading your cpu useage.  There's *absolutely* no way
>you're running two cards with no cpu useage.  Impossible.  Absolutely.
>When I ran two cards on an Athlon XP 3000, I typically got 30% useage
>for the card processes alone and another 25% per transcode process.  If
>I did mpeg4 encoding in real time, I got 30%/card.
>Nowadays I'm running two pvr-250s an one bttv (bt878) card.
>
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He said 0% IDLE not 100% idle.  Anyway, it's hard to believe that he's 
not getting
any jerking, hiccups, or artifacts when there is no CPU time left.

>
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>>I notice that my two bttv cards are not what you'd call exactly in
>>sync, where the tuners are concerned.  If one card gives good picture,
>>the other is just slightly off-channel so the colors are too
>>pronounced, or I get stripes and other interference.  Now what I wonder
>>is this, can one finetune channels per-card, or is the channel
>>frequency globally defined for all cards ?
>>    
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>I've never had color problems.  Perhaps you have a defective card or are
>running an old version of video4linux.
>
>You shouldn't need per/card finetuning as they're receiving the same
>signal.  Spend the $35 and replace the defective card.
>
>  
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-- 
Michael J. Lynch

What if the hokey pokey IS what it's all about -- author unknown