[opendtv] Re: Interlace Artifacts
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 11 Jan 2005 22:50:43 -0500
At 3:12 PM -0800 1/11/05, Ron Economos wrote:
>480p@60 uses the same bitrate or less as 480i@30? That would be a very
>magical MPEG-2 encoder.
>
>Ron
I can point you to many tests done in the '90s that proved this
exactly. But there is one caveat. Most of the tests used source with
equal information content then measured the SNR at the output of the
decoder. Thus, comparing an SDTV source with the same source
deinterlaced and coded as 480P the 480P signal would have a higher
SNR than the 480i encoding.
As a 480P signal can carry more information, it is possible that you
may need more bits to encode the source with the same SNR as the
information content increases. I beleive that NHK was covering live
sports in Japan with native 480P cameras with an emission encoded
bitrate of about 8 Mbps. This compares with about 6-8 Mbps for 480i
source, but the 480P was of significantly higher quality.
Regards
Craig
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