1080p and 1080i question

[fifa500]

For some reason I haven't noticed this on my TV for a while but when I turned it on I found out that on the top left of the screen it says the resolution is 1920 x 1080i coming in from my sky box. I'm guessing this means the resolution is 1080i but can you please confirm this for me. I think the sky box is connected to the TV with a DVI cable rather than a HDMI cable which could be the reason why the resolution is 1080i rather than 1080p. I want to know if there is a difference between 1080i and 1080p because if there isn't i don't want to have to rearrange the cables behind the TV because it's such a mess and the optical cables fall out. The TV is 50 inch if that's relevant in seeing the difference between 1080i and 1080p and the TV is full HD, not HD ready, so my TV is capable of displaying in 1080p (just worth mentioning in case someone tells me that it might be displaying in 1080i because my TV is not full HD). Thanks in advance for your help.

 

[Pinhedd]

For some reason I haven't noticed this on my TV for a while but when I turned it on I found out that on the top left of the screen it says the resolution is 1920 x 1080i coming in from my sky box. I'm guessing this means the resolution is 1080i but can you please confirm this for me. I think the sky box is connected to the TV with a DVI cable rather than a HDMI cable which could be the reason why the resolution is 1080i rather than 1080p. I want to know if there is a difference between 1080i and 1080p because if there isn't i don't want to have to rearrange the cables behind the TV because it's such a mess and the optical cables fall out. The TV is 50 inch if that's relevant in seeing the difference between 1080i and 1080p and the TV is full HD, not HD ready, so my TV is capable of displaying in 1080p (just worth mentioning in case someone tells me that it might be displaying in 1080i because my TV is not full HD). Thanks in advance for your help.

Hi,

most digital broadcasts are in the form of either MPEG-2 encoded 720p or 1080i. MPEG-4 encoded 1080p is common for non-broadcast media (such as BluRay Disks) but remains rare in broadcast given that not all TVs can accept 1080p or MPEG-4 and the bandwidth consumption is quite large.

Most modern PDP/LCD displays will automatically decode, deinterlace, and frame the signal to match the displays native format (which is most likely 1920x1080 @ 60hz). If you download a 1080i video and play it on your TV through your computer the video decoding software may perform the deinterlacing (either in software or through GPU acceleration) at which point it may appear to be 1080p to the display. The only difference is which device performs the format conversion.

 

[mbreslin1954]

"1080i" means 1920x1080 "interlaced", or every other line of pixels are re-drawn every scan, whatever the scan rate is (60 Hz typically, or 60 cycles per second). 1080p is 1920x1080 progressive scan, where every single pixel of every screen is re-drawn every time the screen is refreshed (typically 60 times a second). To save bandwidth analog television only refreshed or re-drew half the screen each frame.

http://en.wikipedia.org/wiki/1080i

 

[fifa500]

So you're saying the reason it's in 1080i is because SKY themselves have chosen to display the content in 1080i?

 

[Pinhedd]

So you're saying the reason it's in 1080i is because SKY themselves have chosen to display the content in 1080i?

That's correct.

 

[fifa500]

Thanks for your answer, it was detailed and informative.

 

[Pinhedd]

Thanks for your answer, it was detailed and informative.

you're most welcome