How different is a HD broadcast of movie differ from the video quality on the bluray?

[Amazing808s]

Sorry if this has been asked a bunch of times.

But I would like to know. How different is the video quality/audio quality different from, let's say, a HD broadcast of a movie on HBO, for example, then the video quality of the same movie on a bluray?

I like to know this for some time now. Does anybody know? Does the HBO, for example, lower the video/audio quality? is it the same as in the bluray release?

[Steel Panther]

Originally Posted by Amazing808s

Sorry if this has been asked a bunch of times.

But I would like to know. How different is the video quality/audio quality different from, let's say, a HD broadcast of a movie on HBO, for example, then the video quality of the same movie on a bluray?

I like to know this for some time now. Does anybody know? Does the HBO, for example, lower the video/audio quality? is it the same as in the bluray release?

TV channels that broadcast in HD are 720p or 1080i. Blu Ray is 1080p.

i = interlaced
p = progressive

Now for the technical part.

1080i and 1080p are both High Definition display formats for HDTVs. 1080i and 1080p signals actually contain the same information. Both 1080i and 1080p represent a 1920x1080 pixel resolution (1,920 pixels across the screen by 1,080 pixels down the screen). The difference between 1080i and 1080p is in the way the signal is sent from a source component or displayed on an HDTV screen.

In 1080i each frame of video is sent or displayed in alternative fields. The fields in 1080i are composed of 540 (half of 1080) rows of pixels or lines of pixels running from the top to the bottom of the screen, with the odd fields displayed first and the even fields displayed second. Together, both fields create a full frame, made up of all 1,080 pixel rows or lines, every 30th of a second.

In 1080p, each frame of video is sent or displayed progressively. This means that both the odd and even fields (all 1,080 pixel rows or pixel lines) that make up the full frame are displayed together. This results in a smoother looking image, with less motion artifacts and jagged edges.

So, technically, 720p is better than 1080i. There is a massive difference between 1080p and 1080i. Watch a movie on TV in 1080i, and watch the same Blu. It's night and day.

[Suntory_Times]

Beyond the more evident above, tv broadcasts are compartivly horribly compressed and have significantly more artifacts (and in my opinion look closer to a dvd then a blu-ray, though dvd's where I live are 560p, so this may be different if you live in America).

[Anthony P]

plus I don't think any cable/sat company offers anything beyond 5.1 DD. While most BDs are lossless (DTS MA mostly) and some are 7.1.

[Steel Panther]

Originally Posted by Anthony P

plus I don't think any cable/sat company offers anything beyond 5.1 DD. While most BDs are lossless (DTS MA mostly) and some are 7.1.

I suppose I probably should've answered the Audio portion of his question too... =P

[Amazing808s]

Thank you all for the responses! I really appericate it.