[opendtv] Re: 625 video quality is good enough....
- From: "Alan Roberts" <roberts.mugswell@xxxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 19 Oct 2004 00:06:21 +0100
Who says that Europe will use MPEG2? The EBU hasn't decided yet, it could be
MPEG2 or 4, or WM, or H264, or Dirac, or .....
That's the benefit of waiting a little, new solutions pop up to solve what
you hadn't realised might be problems. We should get away from dealing with
legacy problems and think about the future.
----- Original Message -----
From: "Doug McDonald" <mcdonald@xxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Monday, October 18, 2004 11:58 PM
Subject: [opendtv] Re: 625 video quality is good enough....
> Al
> > Also, I should point out that part of the argument in Europe over
> > *transmission* formats, is that material shot in 1080/50i would be
converted
> > to 720/50p for *transmission*. That strikes me as daft since much of the
> > 1080 programme production in Europe is in 1080/25psf, so we'd be
> > downconverting to 720p ,then frame repeating it. Hardly an efficient use
of
> > bitrate.
>
> This is done all the time in the US, sending 24p material out as
> 720@60p or 1080@60i. There is no bitrate problem because the
> repeated frames do not contain new material (that is, they are
> not motion interpolated at the station and the interpolated
> frames sent.) Because they do not contain new material,
> they consume almost no bits.
>
> THE killer problem as seen by broadcasters for actual
> 24(or 30 or 25) p material is that current studio productions
> at stations (we do have such things at vast numbers of US
> station, you know) as well as local ads are all provided as
> 480i. Everything is converted to the "greatest common denominator"
> before combining and transmission.
>
>
> Doug McDonald
>
>
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