[opendtv] Re: (S) DTV adaptors available for less than 50 euros in France
- From: Gary Hughes <ghughesml@xxxxxxxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 16 Sep 2005 10:02:59 -0400
At 07:17 PM 9/15/2005 -0400, Manfredi, Albert E wrote:
>When I go through and look individually at each
>improvement of AVC over MPEG-2, I see incremental
>improvements, e.g. in the entropy coding, compared
>with MPEG-2. And there's the deblocking filter for
>error concealment. But the bulk of the improvements
>are techniques gunning for better predictions. And
>the only reason to do better predicting is to
>increase GOP. I asked before: what else would that
>be for?
Better prediction makes for more efficient compression
which make a noticeable difference in environments that
are already bandwidth challenged, even with comparable
GOP lengths. As you would expect, finer grained motion
compensation pays off with the 352x480 and 528x480 formats
commonly used in on demand application today.
>I'm with Donald Koeleman on this. Take a look and
>see if you can find evidence of vast improvement
>in compression, except as relates to prediction.
>
>My SWAG is that at equal GOP lengths, AVC might
>save at best maybe 20 to 25 percent compared with
>MPEG-2. Pure SWAG, I admit up front.
I posted my observations in my reply to Donald's note.
>Others have mentioned this too, by the way. They
>tend to get shouted down.
If you mean hitting the magic 50% reduction without
very long GOPs, then yes, I agree, that message gets
lost amongst the trumpeting and foot stamping.
gary
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Gary Hughes ghughes@xxxxxxxxxxxxxxxxxx
Stargate Video Systems Digital Television & Multimedia Systems
978 250 0024 (cell: 978 457 3393)
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