Basically, my research and knowledge of these two open source programs consists of what I've found on their websites. After trying to put in my own words what they meant, I figured I would just highlight (copy and paste) the most important points 2 me. I don't think I could explain it any better than the guys who developed it can so I've tried doing my best to find the main objectives of each software.
HAP Codec
http://vdmx.vidvox.net/blog/hap
http://vdmx.vidvox.net/tutorials/using-the-hap-video-codec
"A new video codec designed for digital video artists and Mac VJs with the goal of achieving higher performance video playback in OpenGL-based applications”
Hap has the lowest data-rate and reasonable image quality
Hap Alpha has similar image quality to Hap, and supports an Alpha channel.
Hap Q has improved image quality, at the expense of larger file sizes.
http://syphon.v002.info/
“An open source Mac OS X technology that allows applications to share- full frame rate video or stills – with one another in real time.”
· Hardware accelartion on the GPU
· Alpha-channels
· Ever-growing number of Syphon-enabled applications
· A simple SDK so syphon can be added to just about any application
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