[mythtv-users] HD plays fine, SD jerky video and sound?

Mark Hutchinson mark at onnow.net
Thu Feb 7 19:42:13 UTC 2008


Kevin Kuphal wrote:
>
>
> On Feb 7, 2008 1:05 PM, aaron <memoryguy at gmail.com 
> <mailto:memoryguy at gmail.com>> wrote:
>
>     On 2/7/08, Mark Hutchinson <mark at onnow.net
>     <mailto:mark at onnow.net>> wrote:
>     >
>     > Live tv from mythfrontend, HD channels are fine, SD channels are
>     very
>     > jerky with stuttering sound.
>     >
>     > I have tried many many things.  Ideas on how to diagnose this?  No
>     > really anything in the frontend or backend logs.
>     > How can SD be harder or more intensive to play than HD?
>     >
>
>     This might be way off, but if there's no Xv, Myth will need to do
>     software scaling, right? Could it be that it takes more effort to
>     scale the SD resolution (which would be something like 720x480) up to
>     1920x1080 than to (decode HD + scale to 1080) ?
>
>  
> He could probably easily test this by using the controls in Myth to 
> provide different playback resolutions depending on the content so 
> that SD is scaled to 720x480 or something closer to the capture 
> resolution and HD is presented at the native resolution.  The HDTV 
> should be able to compensate for the change.
>  
> Kevin
> ------------------------------------------------------------------------
>
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Where are these settings in mythfrontend?  Or mythtvsetup?
Thanks!


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