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Why is freeview hd 1080i - smo

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SuperUser reader Avirk is curious about the designations he sees on HDTVs and their content as well as how it applies to computer screens. He writes:. I have seen many times resolution of p and I know that mean pixels but sometime I also seen option on the HDTV is i. So I want to know the exact difference between them and is i video quality available for the laptop too? I some Googled and got there are some time P rather than p is there any difference between them too or they represent the same?

SuperUser contributor Rsp goes into great detail explaining the differences between p, i, and when one is preferable over the other. I see a range of problems in the answers and comments here even in some highly-voted answers that provide otherwise very good information that span from minor deficiencies that need explanation to some serious inaccuracies, so I think that some clarification is needed.

The question is specifically: What is the difference between p and i? Some of the information presented below is adapted from my answer to Interlacing on a computer monitor but is rewritten to strictly stick to the subject of the difference between p and i. It is not true that i has a lower vertical resolution than p.

Welcome to the Digital Spy forums. Forums Recent Rules My Activity. Hey there! Sign In Register. I thought HD was broadcast in p. All HD broadcasts are transmitted in i. Either x or x All freeview HD channels use x Ideally the first generation HD should have been P - this has similar vertical resolution to I both has only 1.

But it sounds a lot better to have whatever so the Marketing folk got their way. So there are very few P facilities Yet The p mode is claimed to look better on sports. Me, I;m not convinced. As you have to standards convert there is no need to operate HD interlaced for conpatbality.

In any case why use a compression system in orignation when you haveto compress in any case to get to the viewer,,, it is just silly!! Hi all, Thanks for your replies. They were very interesting. BTW anyone who has not seen digital photos displayed by the same method on a Panasonic TV needs to try it - you get a semi 3D effect at a phenomenal definition.

Of course it does, no one disputes proper p50 can provide superb pictures. Thats a hell of a long way from your 2 x p25 posting, if it's a genuine 50fps x recording. It's still a little off the quality of blu-ray p24 with it's near double the bandwidth it can manage. What is pretty damning and amazing is your assertion if you have a P50 camcorder that it needs no more bitrate than the 25fps interlaced or progressive formats, if it delivers twice the video data how does that compute It takes a lot of bandwidth namely 28Mbps vbr to provide fantastic pictures.

As for still pictures you clearly do not understand mpeg compression. A frame capture of a still image is dead easy because there is no difference between the the following frames. If every frame is the same a tiny bitrate will provide perfect pictures.

Here's a lossless capture of the BBC-HD test card from a x transmission merely resized to x Here's a 12 megapixel image resampled to x image for display on a HD TV. Last edited: Jan 16, Sending the same frame twice would do absolutely nothing to reduce motion artefacts Take a HD camcorder, i x interlaced or p25 use 17Mbps vbr.

Even bluray does not support P50 or p25 either. You must log in or register to reply here. Similar threads S. Lost channel confusion.

Replies 1 Views Jun 5, Rodders Hauppauge Freeview HD recording glitches. Replies 3 Views Apr 27, tgwj As far as I know no one in the UK broadcasts in p. Only i.

Hootenanny wrote: ». DragonQ Posts: 4, Forum Member. This is received by the TV, and the deinterlacer will detect that there is no movement between the fields i. The only advantage of this is that it improves the efficiency of the encode i.


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