[MacDV] Re: AE Stupid question...probably

[Matthew Guemple]

Yest thanks...
On Wednesday, April 30, 2003, at 01:43 AM, Mark M. Florida wrote:

> On 4/30/03 12:16 AM, "Charles Martin" <chasm at mac.com> wrote:
>
>>> From: Matthew Guemple <mo.og at verizon.net>
>>>
>>> Yeah my bad.
>>> 640X480
>>> 29.7 fps...
>>> Full/Best
>>> No compression.
>>>
>> Could it be an issue with the video card or the speed/fragmentation of
>> the hard drive?
>
> Probably not.  This is the equivalent of uncompressed video -- 27 MB  
> (that's
> megaBYTES) per second.  Although hard drives can *theoretically* push  
> that
> much data, streaming it from the hard drive and simultaneously drawing  
> 30
> frames every second to a computer screen is something that is  
> (currently)
> only able to be handled by dedicated uncompressed capture/playback  
> cards and
> video RAID disk arrays.  That's 9,216,000 pixels refreshing every  
> second
> (640x480x30).
>
> So... To address the original issue -- your computer just can't keep  
> up.  If
> you have a Dual 1.42 GHz G4 with a RAID 0 disk array, you *might* be  
> able to
> play it back... But it would probably start to stutter at some  
> point...  If
> you use another high-quality but lossy codec like MJPEG-A/B (anyone  
> know the
> difference between those?) at full quality, you will most likely not  
> notice
> any difference visually on-screen.  If your final delivery will be via
> DV/FireWire, then just save yourself some hassle down the line and  
> work in
> the DV codec at highest quality.
>
> Or... If you want the highest-quality output for broadcast purposes,  
> you can
> render a preview version either at a lower resolution or with a  
> high-quality
> lossy codec like MPEG-4 or Sorensen (or both smaller frame size and  
> with a
> lossy codec), and when it comes time to send the rendered clip to the  
> post
> house, use the "None" compression setting (the "Animation" codec is  
> also
> visually lossless -- it compresses the data instead of the image to  
> achieve
> a smaller file size).
>
> Anyway, hope all that mumbo-jumbo helps.
>
> - Mark
>
>
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________________
Matthew Guemple
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