why does my hd tv picture break up
Why is my TV picture freezing or blocking? Posted March 25, 2013 -
There are a variety of causes for picture breakup (blocky picture) on Freeview. Weve listed them below from most to least likely, to help you identify the issue quickly and effectively. The TV picture freezing or breaking up in this way is most commonly caused by a weak signal. This might be because there is limited or intermittent,Por your cable connections may be faulty (see below). If you have good coverage or have previously had good reception, try retuning your digital box or TV to reload channels. Certain weather conditions can also affect the signal, especially high pressure and snow. Check the condition of cabling and connections. Damaged or loose aerial plugs can cause problems. Try disconnecting aerial amplifiers or splitters which can sometimes lead to equipment getting overloaded or too little signal. If your TV set is close to other electronic devices (such as refrigerators and boilers), they can cause interference. If you are still having problems, contact either the Confederation of Aerial Industries (CAI) or Get Me Digital who can give you details of one or more members who operate in your area and guarantee their work: Find an approved CAI installer atP Find a digital professional atP A local installer will understand the circumstances and local geography in your area and suggest the best option for you.
Related content: A common complaint I get via e-mail or in comments on other articles involves a picture that breaks up into what look like little blocks. Often, people incorrectly refer to these as "pixels," or blame their TV settings. In fact, this artifact is in the source, and unfortunately, there's not much you can do about it. All video you see is compressed. This is to say, the image you see has been manipulated to take up less space, at the expense of absolute quality. For the most part, this compression is relatively good. Uncompressed HD signals are massive, and I think we'd all agree the picture quality of Blu-ray is quite lovely. However, most of us get the majority of our HD video from sources other than Blu-ray, and that's where the problem starts. All other sources, be they streaming or HD channels on cable/satellite, have much less bandwidth than Blu-ray. As in, they're not able to handle the massive HD video files that Blu-ray can. So the data is compressed even further. As the compression increases, there's more possibility of artifacts. Quality is not the first goal of high compression. Smallness is. So as long as you get something, that's what counts. Sadly, for many, this highly compressed image is all they know of HD. Comparing "real" HD from Blu-ray, and the soft, compressed, artifact-laden "HD" from most streaming services and cable/satellite providers is like comparing DVD to HD. I go into this in more detail in ". " The blocky artifact you see above (and in the images below) is called.
It's an artifact that happens when the video codec (encoder/decoder, like MPEG) sorta "runs home to mama. " It can't handle the amount of information being thrown at it, at the chosen bit rate, and the result is blocks in the image. Why blocks? It's a result of how the image is compressed in the codec. Here's a close-up of the macroblocking from the same source as the image at the top. Macroblocking close up. Here's a different program, so you can get a better idea of a more subtle variation. Notice instead of a smooth image, there are lots of little blocks. Click on the image to enlargify. You'll most commonly see macroblocking in fast motion, or when there's a lot going on in the image. The confetti at the end of the Superbowl was a macroblocking mess. Shots of the ocean are another problem, as there are a lot of individual things moving in the shot (like the wave tops). Not every source will have macroblocking. Blu-ray Disc video, as mentioned, isn't likely to have it unless it's an artistic part of the content. may have it, depending on how much bandwidth your local channel devotes to its main HD signal.
Many stations squeeze their HD channel (compressing it further) to fit other channels of digital standard-definition content. Cable and satellite broadcast have this issue a lot. Many cable providers highly compress their HD signals, resulting in an image far inferior to Blu-ray or over-the-air TV, with lots of macroblocking and. Bottom line Because this is a source issue, there's not much you can do about it. Reducing the sharpness control on your TV can help minimize the ugliness (and it's probably not a bad time to ). Your best bet is to just use the highest-quality source you can, whenever possible. If your current cable or satellite provider has a lot of macroblocking or other compression artifacts, it's possible switching to the other type of TV might result in a better image. or it might not. A Google search of "Is Kabletown better than DirecISH TV" or whatever your providers are will certainly turn up a lot of opinions. Some might even be helpful. Got a question for Geoff? First, check out, and more. Still have a question? He won't tell you what TV to buy, but he might use your letter in a future article. You can also send him a message on Twitter or.
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