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Free Video
‘Phone Calls’
Presented to SIR Area 2 CAT
by
Barry Brown & Derek Southern
16 January 2014
How many people?• 1:1 you have several free choices
– FaceTime
– Skype
• 1:1, 1:2 or more; free choices
– TeamView/TeamMeeting (up to 25)
– Google+ Hangouts (up to 10)
At Home, or Mobile
• Windows
• Mac
• iPhone
• Android
• Other
Software
• Browser based - cloud
• Installed on your computer
Usability
• Must be easy to set up
• Must be easy to use
• If more than 1:1 you need
management controls eg scheduling
• Multi-OS is an advantage
• Support – documentation
• Video plus call-in audio
Webcam factors
#1: Image sensor
• CCD
– For high quality video
– Lower video noise
– More expensive than
CMOS
Webcam factors -2• Definition
– 320x240 pixels OK for Skype
– 640x480 pixels OK for small
video clip for uploading to
YouTube
– 1920x1080 pixels is the highest
definition
– 1080p or 720p?
Webcam factors -3• Sensitivity of image sensor – low
sensitivity degrades video quality dramatically
• Microphone – noise cancelling is useful
• Autofocus – tracks and focuses on the face (look for OFF switch)
• 360° rotation or fixed
• For video: how many FPS? High quality usually needs >30fps
Webcam lens• Glass or plastic
– Plastic lens sufficient for video
chatting
– Glass lens for high quality
output, up to broadcast quality
– Glass lenses are more
expensive
TeamMeeting
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