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Posted by Jim S on 01/08/07 07:40
"Jim S" <Jim S@jimsplace.com> wrote in message
news:45a1e3ad$1@clear.net.nz...
>
> "Dave Martindale" <davem@cs.ubc.ca> wrote in message
> news:ensm33$qbr$1@swain.cs.ubc.ca...
>> Rick Merrill <rick0.merrill@NOSPAM.gmail.com> writes:
>>
>>>Better, get a camcorder with a hard drive to record DV25 files then you
>>>can edit it without waiting for ingest time.
>>
>> That's a great idea, but do any such camcorders exist? All the hard
>> drive camcorder's I've looked at record MPEG, and boast about the long
>> recording times they are capable of (at very low quality). Nobody seems
>> to provide DV25 recording for quality, even as an option.
>>
>> Dave
>
> Have you studied the new AVCHD format, see for example:
>
> http://www.camcorderinfo.com/content/Sony-and-Panasonic-Announce-Blu-Ray-High-Definition-Camcorder-Format.htm
>
> It says here that:
>
> "The increased 18Mbps bit rate of the AVCHD format will likely impress
> prosumer users who have been disappointed with the quality of DVD video.
> At more than double the current 8.5Mbps rate, the new bit rate is very
> close to tape-based standard definition, and it is likely that AVCHD video
> will be of a much higher quality than existing DVD camcorders.
>
> The Sony HDR-SR1 is an example of a hard drive camcorder that uses the
> AVCHD format. This format is also used on tape and DVD camcorders, see
> here:
>
> http://www.sony.co.uk/view/ShowProductCategory.action?site=odw_en_GB&category=CAM+High+Definition+Handycam
>
> and here:
>
> http://www.avchd-info.org/
>
> So because the AVCHD format is said to have a bit rate that is "very close
> to tape based standard definition", doesn't this improve the appeal of
> hard drive and DVD camcorders that record in this format?
>
> Cheers, Jim
A correction to the above post, the AVCHD format is used only on Sony's new
30gig hard drive camcorder (HDR-SR1) and on its DVD camcorder (HDR-UX1) and
it uses MPEG-4 AVC/H.264 video compression (see
http://en.wikipedia.org/wiki/AVCHD).
On Sony's Mini DV tape camcorder in the new series (HDR-HC3) MPEG-2
compression is used.
The hard drive model (SR-1) can record 4 hours of video at the highest
resolution of 15 Mbps. The DVD model (UX-1) can record for 27 minutes at
12Mbps on DVD+R DL discs.
The ability of the SR-1 to record for 4 hours at 15Mbps on its hard drive is
a pretty good feature (saves changing tapes after 1 hour). And 15 Mbps is
apparently "very close to tape based standard definition. So hard drive
camcorders have taken a step forward with the introduction of AVCHD.
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