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Posted by Frank on 07/14/07 17:57
On Sat, 14 Jul 2007 13:30:14 -0400, in 'rec.video.production',
in article <Re: Canon XM1 Grainy video>,
Mike Kujbida <kXuXjXfXaXm@xplornet.com> wrote:
>Rick Merrill wrote:
>> Martin Heffels wrote:
>>> On Fri, 13 Jul 2007 14:32:20 -0700, Harvey <harvey_twyman@yahoo.com>
>>> wrote:
>>>
>>>> Don't Use Long Play (LP) on DV Tapes - the picture quality will also
>>>> degrade.
>>>
>>> Gawd. How long will this myth stay alive? Die, die, DIE!!!
>>> IT IS WRONG. Only analogue video looses quality at LP, not digital.
>>>
>>> -m-
>>
>> So many caveats, so little time: LP on DVD camcorders is "digital" yet
>> it looses quality because the resolution is halved.
>
>
>Wrong!! It's the bitrate that gets lowered, not the resolution.
>For example, here they are for the Sony DCRDVD108.
>
>Movie Quality:
>SD HQ (Average: 9Mbps): VBR;
>SD SP (Average: 6Mbps);
>SD LP (Average: 3Mbps): VBR
>
>Mike
Not to be argumentative, but the original statement was related to LP
mode DV tape recording, so the "caveat" about DVDs wasn't really
relevant. I mean, if we're going to take the expression "LP" so
literally, then for the sake of completeness, let's throw in LP
phonograph records as well. :)
Secondly, there are standalone DVD recorders that in the very long
recording time modes lower not only the bitrate but also the frame
size, no longer producing (in the NTSC version) 720 by 480 frames, but
frame sizes more commonly associated with MPEG-1 VCD.
--
Frank, Independent Consultant, New York, NY
[Please remove 'nojunkmail.' from address to reply via e-mail.]
Read Frank's thoughts on HDV at http://www.humanvalues.net/hdv/
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