The videos from all of the various breakout sessions should be available soon. In the mean time, here are my notes from some of the sessions I attended.
Video- What in the World Are You Doing To My Network?
Jeff Schertz, Polycom
Foundational Concepts
- Video codecs in 2013
- RTV
- H.264 Scalable Video Coding
- Hardware acceleration
- More resolutions up to 1080p
- Multiple panorama resolutions
- Temporal Scaling - mult frame rates in single encoded stream
- UCConfig mode - look at Jeff's blog for more info
- Client can send up to 5 possible concurrent streams per video source
- Very unlikely though
- Client can receive multiple streams as well
- Views available in the Client
- Gallery view
- Speaker view
- Video Spotlight - presenter can lock view to his camera
- Compact view - Not showing any video
- Lync will selectively start/stop participant video as needed during conference if no one is viewing their stream to save on bandwidth/computing
- Smart Framing - This is basically smart cropping based on facial tracking
- Cropping - There is no square resolution in Lync, the client hides the edged for real estate
- Video is encoded and sent in full resolution
- Video Resolution - more is less - resolution goes down for each stream as more streams are shown
- Pixel depth more important than screensize
- Unique experiences
- Dual monitors
- Lync room system - span 2 monitors
- Panoramic
Doing the Math
- Don't forget about audio!!
- Include payload and RTCP payload (5-15 Kbps)
- H.262 SVC - lot more options/resolutions, much cleaner display at any resolution
- Lync Bandwidth Calculator
- Conference calls typically use less bandwidth
- Default video stream is 320x240 15Kbps
- Have to manually resize vdeo for higher resolutions
- Controlling bandwidth
- Get-CsConferencingPolicy | fl *video*
- AllowIPVideo
- EnableP2PVideo
- MaxVideoConferenceResolution
- To disable gallery view
- AllowMultiview
- EnableMultiviewJoin
- Conferences with over 75 participants switch to only display active speaker automatically
- Limiting bit rates
- Default limit 50 Mbps for sent video
- Total receive default 50 Mbps
- Must be at least 420 Kbps to support gallerey view, may get weird behavior below this
- Bit rate is measured per video source - webcam, roundtable, etc
Actual Usage
- Usage at Microsoft
- Daily 6,000 minutes peer to peer
- Daily 226,000 minutes conferencing
- 11 million minutes of video in November 2013
- Users tend to keep default resolutions
- No bandwidth or CAC policy constraints in place
Summary
- Factors for growth
- Age - Younger workers like video as they tend to have grown up with it
- Ubiquity - Video is looking better than it ever has, much more common
- Culture
- Experience - As they use it, they want to use it more
- Importance of the Video modality
- Audio is the Pinnacle
- Content is King
- Video is a love/hate relationship
No comments:
Post a Comment