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Posted by Larry Johnson on 10/05/48 11:42
Movies shot on 35mm film begin with a native frame resolution of 4096x3072 -
known as a 4K image. This image is cropped to the letterbox frame you see on
the screen, whether in the theater or on your television. The original frame
resolution for your video is 720x480 if it is NTSC. That's quite a bit
smaller than the original frame of a Hollywood movie. To make it more clear,
if 4096x3072 were a football field 720x480 would be a postage stamp.
The next thing Hollywood DVD production houses have that we don't is a very
sophisticated routine of hardware and software encoding techniques. Using
this hardware and software they perform multi-pass encodes scene by scene.
Unlike the multi-pass we can do, which is normally 2-pass, Hollywood
production houses can perform a greater number of passes on their material
in order to ensure an even higher quality end result.
No matter how hard you try, given the differences in resolution between
their original frame and yours, you will never match the quality of a
production run DVD. When you stated that your video looked better when you
limited the DVD to less time you are correct. With less video time you can
perform higher quality encoding which takes up the same space as more video
with lesser quality video.
In the future, as HD and HDV become more mainstream for the consumer and
prosumer, the quality of our DVD's will become better. This will be mainly
because of the larger frame resolution, which yields more picture
information as is true with Hollywood movies - more picture information
equals higher quality. Even if HD and HDV video is downsampled to fit on a
normal DVD at 720x480 the resultant video will naturally look better than
video derived from a standard definition camcorder.
--
Larry Johnson
Digital Video Solutions
webmaster@digitalvideosolutions.com
http://www.digitalvideosolutions.com
877-227-6281 Toll Free Sales Assistance
386-672-1941 Customer Service
386-672-1907 Technical Support
386-676-1515 Fax
"Everyguy" <everyguy@Nospam.com> wrote in message
news:GmWRf.1766$HW2.420@newsread3.news.pas.earthlink.net...
>I notice that if I limit DVD's of home video to 1 hour, the quality is
> considerably cleaner. The graininess that shows up in certain areas at
> times
> in the longer DVD - basically go away. Some people might not even notice
> the
> difference but I do.
>
> So why is it a commercial DVD can contain a complete movie plus whiz bang
> graphics and "extras" and still look very sharp, even on a computer
> monitor
> which I find generally has fuzzier resolution than a TV? Or even one of
> these "squeezed" DVD's on a CD with a full length movie can still look
> very
> good, with obviously far less data?
>
> Is it that the master they're working from is so much sharper it can take
> more degradation, or the process they use to compress the video, or...?
>
>
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