HDTV ,data rates,filesizes,videos,and lots of headaches...
 

OK ... iv been trying to figur this out for months ...i want to know just how big is an un-compressed 2hr long 1080 HD video??? iv herd everything from 50GB to a whoping 1.8 TERABYTES.

how large is a 2hr 1080 HD video???

how large is a un-compressed 2hr normal 480 video???


and what is the data rate for both?? eg MB/s ,Mb/s, kb/s ? what?

and what are the stats on these things after theyv been compressed losslessley??

and how much can you compress a video befor you see artifacts/compression scars in it??.....i can see artifacts in dvds and in sattelite tv...

i want to know ONCE AND 4 ALL?!?!?!?!?

Well that's the point. You can fit 2hrs of video on a 4.7 GB disk or a 8.5 GB disk depending on the bit rate set for video & audio format & bit rate. You can fit up to about 4 hrs on a 4.7 GB disk (but not such great quality!) Certainly the earlier (& still many now) dvd's use very low video bit rates such as around 4 Mbps. Whereas the dvd format allows up to 9.8 Mbps inclusive of video & audio. But many players on the market cannot play above 9 or 9.5 Mbps.

So in many ways it depend upon what quality setting the video is set at. For standard video a setting of about 8 for video gives a size of about 55 MB/minute, whereas a setting of about 4 Mbps is about 35 MB/min depending upon the particular video in question (yes this can vary!)

For HD ... well there's more than one HD format. But for the one you mentioned, I don't know! lol :D Never had the experience to date. The uncompressed size is about 20 times the size of standard video roughly AFAIK.

i dont so much cair about the compression. the big thing a want to know is what is the size of a 2hr long 1080 HD video without any compression AT ALL ,like raw un-compressed video.

i know dvd is compressed at ether 40:1 or 20:1 (cant remember wich) but i think HD is 4x larger than standard 480.

i got the 1.8 TB idia from this problem i thout up : 32 bits per pixel, 32 bits x 1080x1920 pixels=2073600pixels. 32 x 2073600=66355200 bits per frame . 66355200 devided by 8 = 8294400 bytes per frame(8.2944MB). about 8.5MB per frame x 30 frames per second =about 250MB/s . 250MB/s x 60 seconds=15000 MB/minut (15GB/minut) .15GB/minut x 120 minuts =1800GB (1.8 TB) for a 2 hr movie!!! is my equashion right??

Artifacts in DVD videos are possible but then it's probably badly mastered (bad encoder software or bad settings) just like Audio CDs that can sound great or crappy depending on the production.

Uncompressed digital video is hardly used anywhere. Not even DV - used by digital cameras - is uncompressed:
http://en.wikipedia.org/wiki/DV

If people want uncompressed video, they usually go for analog
formats on film. Most of these have still a higher resolution than HDTV but it's difficult to compare due to the different properties of the media.

Your calculation is about right but a pixel uses only 24 or 16 bits. Video data is almost never stored in RGB format but
YUV (or more correct: YCbCr http://en.wikipedia.org/wiki/YCbCr) - luminance, blue chroma, red chroma. Most uncompressed but reduced video formats use 4 luminance values per 2 blue and 2 red chroma values (called 4:2:2). That's how the 16 bit per pixel are calculated. It's very different from RGB 16-bit formats which would allow only 65536 colors.