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

Kevin Kuphal kkuphal at gmail.com
Thu Feb 7 19:39:40 UTC 2008

On Feb 7, 2008 1:05 PM, aaron <memoryguy at gmail.com> wrote:

> On 2/7/08, Mark Hutchinson <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

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