[mythtv-users] HDHomeRun and jumpy video

Rich West Rich.West at wesmo.com
Fri Sep 14 16:11:27 UTC 2007

Brian Wood wrote:
> Rich West wrote:
>> Dan Ritter wrote:
>>> On Thu, Sep 13, 2007 at 10:48:18PM -0400, Rich West wrote:
>>>> I've got a new HDHomeRun and a mediocre antenna set up which is showing 
>>>> excellent signal quality on the major stations in the area.  However, 
>>>> when those stations are viewed via mythtv, the video looks great except 
>>>> for the fact that it seems to stutter about once a second.  One station 
>>>> has the audio delayed by about a second, as well...
>>>> Viewing through VLC is a little better, but not a whole lot....
>>>> Before I go digging further, and possibly buying a better antenna, would 
>>>> an antenna cause the stutter, or is this possibly a limitation of the 
>>>> backend and/or frontend? (viewing via VLC is, obviously, direct to the 
>>>> HDHR, whereas via mythtv it's going through the backend).
>>> What's your hardware on the frontend? Have you had perfect HD
>>> playback before?
>> This is my first foray in to HD on this box other than playing DVD's or
>> DivX/MPEG-4 HD video.
>> The FE's have AMD64 3000+'s, 512MB RAM, local IDE drive, nVidia GeForce
>> 6200.  The machines have always been rather bored.  Even when I was
>> pushing HD during my tests last night, the machines were still bored...
> Are you using nVidia's drivers? HD with the generic nv driver is
> problematical.
>> I guess I'll hit up RadioShack or something for a decent powered antenna
>> vs the tiny thing I picked up at HomeDepot and give it another shot this
>> evening.
> Funny thing about digital TV: You either have it or you don't (sometimes
> known as the "cliff" threshold).
> If you have sufficient signal to watch it's unlikely a powered antenna
> will help. Also remember than amplifiers amplify the noise as well as
> the signal :-)

Definitely using the nvidia drivers.

Yup.. the advantage/disadvantage of being binary (1 on, 0 off). :)

The antenna I picked up is this little powered antenna that is about
3.5" x 7" x 1/2".  It's ever so slightly bow shaped with a long (3ft)
extendable antenna off of the back of it.  When I bought it, I figured I
was only picking it up for testing/proof of concept.  Antennaweb shows
all of the stations to be ~21miles from my house at 277Degrees (almost
due-west).  I'm betting I probably need something a little more serious
than this thing...


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