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Re: More About FastStart Quicktime MOV

On Thursday, June 26, 2003, at 04:27 PM, "J. Arthur Lee" <email@hidden> wrote:

I am looking at the options provided by the Fast Start for QTVR movie
in the Quicktime export feature. I tried two different exports with two
different compression schemes and values.
1. Sorenson Video3 at 50%
2. JPEG Photo at 50% (the default except at 50% instead of 25%
compression value)

Added "Blur" to  both. (Herein another question as this is suppose to
reduce the visibility of compression artifacts)...
both the resulting exports were large in file size than the original
file. Does such an export rely on file size to make the Fast Start, or
does the Fast Start add bits to make the movie load faster even if the
files size is larger?

Fast start by itself doesn't change the size of the movie more than an iota (or epsilon). Adding a preview track does, though.

I don't particularly like compression artifacts, so I generally set my preview quality to 65% for cubics.

When making cubics with MakeCubic, you have a lot of control over the resolution, and I usually set it between 0.5 and 1.0 pixels per degree. Unfortunately, when you export in QuickTime Player, you don't have much control at all: either 1/2 or 1/4 resolution. Unfortunately, this yields huge previews when you've got huge panoramas: a 16,000 pixel cylindrical panorama divided by 4 yields a 4,000 pixel preview, when what you want is more like 400 (or 1/40 of the full resolution). The API accommodates up to 1/32767, but only 1/2 and 1/4 are exposed in QuickTime Player.

Luckily you can create your own previews in PhotoShop and add it in QuickTime Player.

--
Ken Turkowski                    email@hidden
Engineer/Scientist   http://www.worldserver.com/turk/
Independent Consultant      Industrial Grade Software
Computer Graphics     2D     3D     Immersive Imagery
Photo-mosaicing       Panoramas       Computer Vision
Applied Mathematics  Numerical Analysis  Optimization
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