[mythtv-users] HDHomeRun and jumpy video

Meatwad meatwad.get.the.honeys at gmail.com
Sat Sep 15 01:03:55 UTC 2007

Rich West wrote:
> 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...

I've used the Silver Sensor (Zenith sells it in the states) from that 
distance to downtown Chicago. Lots of scatter through trees and all 
sorts of multipath in the analog realm from buildings and tranin 
tressles. Not a problem at all.


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