[opendtv] Re: (S) DTV adaptors available for less than 50 euros in France
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 16 Sep 2005 10:53:20 -0400
At 2:57 PM -0400 9/15/05, Manfredi, Albert E wrote:
>The goal is mostly to reduce the I frames as much as
>possible. The next goal is to reduce the P frames as
>much as possible. P frames are computed with I frames
>and motion vectors. B frames are interpolated between
>either I and P or P and P frames. So having accurate
>motion vectors affects B frames too, although only
>secondarily.
Huh?
B frames are NOT interpolated. They are no different than P frames
EXCEPT that the motion vectors are referenced to two frames - before
(I) and after (P) - rather than only to the I frame that occurs
before the P frames. As with P frames, the prediction is subtracted
from the ACTUAL frame and the differences are encoded using the
frequency domain transform. The better the prediction, the smaller
the differences that must be encoded.
>
>If you *can't* increase the GOP compared to what it was
>with MPEG-2, then you will seriously reduce the
>compression advantages of AVC.
Only in your imagination Bert.
Regards
Craig
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