[opendtv] Re: HP and Philips to Begin Licensing Video Content Protection System to Manufacturers after Gaining FCC Approval
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 5 Aug 2004 17:52:49 -0400
Terry,
Once Mr. MPEG gets his hands on video, there are things much worse than NTSC
source material that can affect the final product.
Things like lowering the horizontal pixel resolution, and lowering the
allocated bitrate to the point of encoder starvation.
Further, DVDs look much better because A) they use 24 fps progressively
scanned source material, not interlace, and B) the compression is NON real
time, so an operator can make tweaks to the compression decisions made by
the encoder to reduce noticeable artifacts in difficult scenes and scene
transitions.
I agree that NTSC composite material suffers compared to ITU601 SDI video,
but both look horrible after being fed through the DirecTV meat grinder.
Cheers,
John Shutt
----- Original Message -----
From: <tjharvey@xxxxxxx>
> Trouble is that hardly anyone has considered broadcasting true SD. Current
DVDs are better than most broadcast television because it is fully component
video sampled to ITU R601. Most of the stuff touted as "SD" quality is
merely NTSC quality.
>
> To define the quality difference, consider this:
>
> NTSC
>
> Luma bandwidth: to 3 MHz (if your lucky).
> Chroma bandwidth: 500kHz
>
> SD
>
> Luma bandwidth: to 5.5 MHz
> Chroma bandwidth: to 2.75 MHz
>
> Also consider the NTSC artifact garbage and the loss of diagonal luma
resolution through comb filter decoders, much of the so called "SD" you sees
today is really awful.
>
> Maybe we can learn from our European counterparts who abandoned composite
PAL in the studio years ago.
>
> Cheers,
>
> Terry Harvey
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