[mythtv-users] Watching HD streams on a SD set

Billy Macdonald billymacdonald at gmail.com
Thu Oct 4 16:58:56 UTC 2007

On 10/3/07, Enigma <enigma at thedonnerparty.com> wrote:
> I have been attempting to watch HD recordings on a standard television
> set with limited success.  The frontend in question is has onboard Intel
> 915G graphics using the i810 driver.
> Whenever I view HD content on the frontend, I see massive interlacing
> artifacts when anything is remotely moving.  Do I need to run a
> deinterlacer if I am displaying on an interlaced device?  Is there a
> resolution at which I should be running the display that will be more
> efficient for the Myth player?  I am currently running the display at
> 1024x768.  My SD tuner cards record at 720x480 and it seems to display
> fine on the set, but any HD material has herringbones whenever something
> moves.  Does anybody have any experiences or tips for displaying HD
> material on a regular set?
> Also, does anybody know if Myth supports XvMC for this device?  The wiki
> only mentions Nvidia and ATI cards but the driver documentation seems to
> indicate that the driver supports XvMC.  Has anyone successfully used this?
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I would set your playback resolution lower.  You're scaling 1920x1080
down to 1024x768 and then down to 640x480.  If you set your playback
resolution down to 640x480 it's one straight shot from 1080 to 480.
In theory you wouldn't even need deinterlacing as you only have the
resolution to display less than one field anyway.  And since the back
bars are added at the top/bottom, that 1080 resolution is actually
getting squished to about 360 lines of resolution.  I'm not sure if
the players are smart enough to figure that out or not.

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