[Osx-nutters] 15 for this?

[Kevin Callahan]

On Sep 13, 2006, at 9:32 AM, Roger Howard wrote:

> On Wed, September 13, 2006 8:25 am, Kevin Callahan wrote:
>>
>> On Sep 13, 2006, at 6:57 AM, Shawn Erickson wrote:
>>
>>>
>>> On Sep 12, 2006, at 11:30 AM, Kevin Callahan wrote:
>>>
>>>> $15 for this resolution?
>>>>
>>>> With iTunes 7, all videos purchased from the iTunes Store are
>>>> downloaded in near-DVD quality at a resolution of 640x480 (up to
>>>> 480, depending on the aspect ratio),
>>>
>>> Most "library" Movies are $10, new releases are $15 unless you pre-
>>> order or buy them in the first week then they are $13.
>>>
>>> <480px-Standard_video_res.svg.png>
>>>
>>> In the end you are getting near NTSC resolution (with a frame rate
>>> of 24p) with decently high-quality encoding (and of course stereo/
>>> surround) audio). Most folks won't notice much of a difference
>>> between what you get and your average DVD. It is a simple matter of
>>> balancing quality / resolution against the fact of how large the
>>> downloads would be. If you jump up to 720P then you are talking
>>> about an increase over 2x in the data rate assuming you maintain
>>> similar level of compression in the encoding.
>>>
>>> Recall that your average DVD uses MPEG-2 (which isn't as good as H.
>>> 264 at the same data rate) and it could even contain video encoded
>>> at 352x480, 704x480, or 720x480 with a similar dropping of vertical
>>> resolution to allow wide screen formats.
>
> Not only that, but given the difference in PAR (pixel aspect ratio  
> - the
> shape of pixels) between NTSC and computer video, a video encoded  
> in NTSC
> at 720x480 is effectively "only" 640x480 anyway. So nothing is lost  
> anyway
> - if they provided 720x480, it'd still only be displayed at an  
> effective
> 640x480.

this is great to know!
thanks

K