Hey Andy,I just looked at your post quickly and noticed that you didn't seem to limit the bit rate on any of those clips. By limiting the bit rate you can get very similar results at much much lower bit rates. For example - take your smallest clip. You compressed it using 3ivx at 160 X 120 pixels, 15fps but the bit rate is 420kbits/sec - about 8X too big to progressive download over a dialup modem.
Here's a video that I did last year as a test to see what what videoblogging would look like on dialup. I used 3ivx, 160 X 120 pixels, 8fps and I limited the bit rate to something like 33 kbits/sec. The result is my 45 sec video comes in at 271K (
48.77kbits/sec) while your 5 sec video comes in at 285K (420.28kbits/sec).I think the idea of doing a compression matrix with a single test clip at set bit rates is a great idea. I'd love to help put one together using mpeg4, 3ivx,
h.264, windows media 9, and Flash 8 - using single and double pass where available.-VerdiOn 4/25/06, Andy Carvin
[EMAIL PROTECTED] wrote:Hi everyone,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 aviformat, 30 frames per second, 640x480 pixels, 16 bit stereo. I thenproduced seven compressed versions of it, including ones that utilizevarying frame rates, screen sizes, compression codecs, and audio
compression.The most compressed version I created is 97% smaller thanthe original avi video, and is potentially quite suitable for videoblogging in low-bandwidth situations around the world. Some examples:
Original uncompressed video (10 megs):http://www.andycarvin.com/video/demo-nocompression.aviSignificant compression (1.8 megs, 82% reduction):
http://www.andycarvin.com/video/demo-3ivx.movExtreme compression (292 bits, 97% reduction):
http://www.andycarvin.com/video/demo-3ivx8bit160.movHere's a chart featuring all of the videos and their settings:http://www.andycarvin.com/compressiontable.html
Hope this is useful,andyAndy Carvinacarvin (at) edc . organdycarvin (at) yahoo . comhttp://www.digitaldivide.net
http://www.andycarvin.com--Yahoo! Groups Links* To visit your group on the web, go to:
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* Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/-- Me:
http://michaelverdi.comRD: http://evilvlog.comLearn to videoblog: http://freevlog.orgLearn to videoblog in person:
http://node101.org
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