[opendtv] Re: [oldvtrs] So Much for HDTV]
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 20 Aug 2008 20:53:28 -0400
Craig Birkmaier wrote:
> You start the second stream and let the buffer fill, then do
> the cross-fade in the receiver. Fades are easier - just a byte
> to tell the receiver to fade the current stream doww before
> switching to the new stream.
Tom Barry wrote:
> I think what Bert was saying was to increasingly filter to
> lower effective (blurred) resolution during the cross-fade
> process. And that seems like a good idea to me. The detail
> is obscured anyway and motion comp doesn't work well
> there so you might as well just blur instead of block.
That's what I was proposing, but Craig instead wants to send full strength
digital signals to the receiver, along with instructions for the receiver to do
the fade. I guess, after the decoder. E.g., if you assume the decoder outputs
a Y Pb Pr analog signal to the monitor, then the Y of that signal can be
smoothly reduced at the receiver, avoiding the macroblocking problem? So, just
send that "fade Y to 0" instruction to the receiver.
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?
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.
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.
Bert
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