HD Pixelization

Started by sponger246 Mar 8, 2007 16 posts
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#1
My HD picture is great other than the random pixelization. Im watching the ACC Tournament in HD and when there is a zoomed shot on the court with players running down the floor (fast motion), the image starts to get pixelated. Its fine when its zoomed out. Any ideas on this one?

Right now Im connected with component cables. Will switching to an HDMI really make that much of a difference?

Thanks
#2
Cable, Satellite or OTA?
#3
digital cable
#5
So I take it that there is nothing I can do to fix it? Its all up to the cable service?
#6
Based on your description, yes.

If you have severe pixelation and blocking with still images or those with little motion then that would be a provider problem.

DTV compression is based on what is similar between frames therefore still images and those with little motion require little bandwidth to keep puttering along. Scene changes and lots of motion requires full bandwidth or you will get what you are describing.

Last year CBS did multicasting for March madness causing exactly that and more even over the air due to multicasting, multiple channels, which also robs bandwidth. As noted in that other thread there is a certain point of bit shaving where you are going to notice this and for multicasting that is about 2meg of bitstream and 1080I is far more senstive to that than 720P. Beyond that things start going to hell.

If you want to look into this further I suggest you find a local users group via Yahoo or the AVS forum to find out if the local is choking the signal. If not then OTA just may be your solution!
#7
Could you explain or sum up what the OTA is?
#8
Could you explain or sum up what the OTA is?

Over The Air - receiving your local stations ATSC signal via an antenna. This is the source for your cable programs and if the problem occurs there then it's not the cable company's fault. It is possible the cable company is shaving bits when they rebroadcast but chances are it's there OTA as well. You'll also notice it when watching a live musical performance with strobe lights or certain bright colors (like the red XLR at the super bowl a few years ago).
#9
The pixel issue is somewhat better now that I have a larger, more protective cable running straight from the box to the back of the digital receiver and not through a splitter. My only issue now is with the "red colors". They look fine close up but on a distance shot they look like they are moving or they are bleeding out around the objects. I have tried to play with the red/green balance but have had no luck.

Does anyone have any other suggestions?
#10
My only issue now is with the "red colors". They look fine close up but on a distance shot they look like they are moving or they are bleeding out around the objects.


That is odd considering the opposite is the typical experience. It does not make sense at all on this end...

My first thought is you don't have the STB set for an HD scan rate...
#11
Well I thought most of the pixelization was gone...not so, I was watching tonight and still anything overly fast moving has an issue, especialy with anything like strobe lights or fireworks. I have thought about a HDMI cable and whether or not it would make things better over component. What do you think?

Im going to recheck all my connections tomorrow.

Im begining to think its a wiring issue or just a crappy signal.
#12
As posted earlier in the thread... you are experiencing bit shaving/compression

It is a provider problem, not the cables.
#13
Ok, I get that. So am I right in assuming that my other tv's dont have an issue because they are not running through the digi-box?
#14
Those other TV's are HD or SD?
#15
SD
#16
So am I right in assuming that my other tv's dont have an issue because they are not running through the digi-box?


Almost... Since they are SD with no box that means they are using the old NTSC RF system. The beauty of that is you CAN'T bit shave or compress. Unfortunately it requires far more care and maintenance by the cable company to keep noise down or you get snowy pictures.

If those TV's had a box the result would be the same until you tune the digital channels, SD or HD, because only with digital can you further compress a signal and they do that all the time to conserve bandwidth providing more and more degraded channels over fewer good looking channels; quantity versus quality.