Posted by Rick Merrill on 07/14/07 22:58

Frank wrote:
> 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

I'll have to check my manual again! But it is currently giving me a
full hour on a 15 minute DVD, and to do that it must both change the
rate AND reduce the resolution to 352x480.

>
> 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.
>

I recognized that, but as most conversations do many veer off from the
original context.

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