[opendtv] Re: [oldvtrs] So Much for HDTV]
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 21 Aug 2008 10:06:27 -0400
At 8:53 PM -0400 8/20/08, Albert Manfredi wrote:
I agree with his comment that these fades are
easier than fading from one scene to another.
I'm not sure how you send two full scenes and
expect the cross fade to be done in the analog
domain, without overtaxing the digital channel
in the process. So you end up with macroblocking
anyway?
No.
We are talking only about a small number of
simultaneous frames - typically 5 to 30. so we
are talking about one or two GOPs. The major
impact is the need for two decoders, which is not
a big deal anymore and adds all kinds of useful
capabilities to the TV (e.g. Picture-in-picture).
The extra overhead can easily be accommodated in
the stat mux. In essence it is simply a case of
"pre-rolling" the next stream."
I'm guessing here. It does seem that this
particular trick, i.e. fading scenes, hasn't
been fully figured out in DTV, to me.
There are a number of encoders that have special
firmware to deal with fades. I am not aware of
any that can deal effectively with crossfades.
The problems with "swoop logos" are notorious -
lots of detailed moving information over a
transition form one stream to another. This too
could be done in the receiver, since the swooping
graphic is typically just a still image that
moves - my Mac does this when opening up
applications that have been suspended and put on
the task bar.
Or maybe we'll be trained into thinking that
"fading" means "gradually decompose the image
into an artistic mosaic." In other words, it's a
feature.
bah humBUG
It's time to move to real digital television
where the intelligence is at the edges of the
networks instead of assuming that there is no
intelligent life in the audience.
Regards
Craig
Bert
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