One of my vlog viewers asked me for an explanation of various quicktime
compression techniques. I've just published my response:
http://www.andycarvin.com/archives/2006/04/andys_video_blogging.html
In this demonstration, I start with a 10 megabyte video shot in avi
format, 30 frames per second, 640x480 pixels, 16 bit stereo. I then
produced seven compressed versions of it, including ones that utilize
varying frame rates, screen sizes, compression codecs, and audio
compression. The most compressed version I created is 97% smaller than
the original avi video, and is potentially quite suitable for video
blogging in low-bandwidth situations around the world. Some examples:
Original uncompressed video (10 megs):
http://www.andycarvin.com/video/demo-nocompression.avi
Significant compression (1.8 megs, 82% reduction):
http://www.andycarvin.com/video/demo-3ivx.mov
Extreme compression (292 bits, 97% reduction):
http://www.andycarvin.com/video/demo-3ivx8bit160.mov
Here's a chart featuring all of the videos and their settings:
http://www.andycarvin.com/compressiontable.html
Hope this is useful,
andy
--
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Andy Carvin
acarvin (at) edc . org
andycarvin (at) yahoo . com
http://www.digitaldivide.net
http://www.andycarvin.com
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