perceptual video metrics, a new vocabulary for qoe
TRANSCRIPT
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Perceptual Video Metrics, a new vocabulary for QoE
Jeremy BenningtonCheetah Technologies
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Video Quality Management
Quality of Service
Quality of Experience
Perceptual Quality Monitoring
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What is a Mean Opinion Score (V-Factor)?
V-FACTOR
4 – Perceptible 3 – Slightly Annoying2 – Annoying
5 – Imperceptible
1 – Very Annoying 1 – Very Annoying
5 – Imperceptible 4 – Perceptible 3 – Slightly Annoying2 – Annoying
V-FACTOR
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V-Factor MOS shows a significant change in quality over 12hours Issue with the encoding from the programmer
V-Factor MOS shows a significant change in quality over 3hours Issue with the program (like an old movie)
Gradual degradations of visual quality must be trended over a longer period before alarming
Only monitoring using perceptual metrics can identify these events
Real World Case StudiesGradual Degradations
12 Hours 3 Hours
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Sudden drops in quality are common and un-related to MPEG-TS or VCL These events should be alarms for operations These events (when seen at the ingest) should be used to screen trouble
tickets & truck rolls
Real World Case StudiesSudden Degradation
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Quality TrendsWeek over Week with threshold violations
Consistent week-over-week average quality Events are easy to find with a threshold violation Useful in determining problematic programs and reducing trouble tickets
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Quality Trends Week over Week with periodic trend
Consistent week-over-week periodic quality Events are hard to find with a threshold violation Correlation and moving average are easiest ways to find errors Pattern caused by different programming from midnight to 6am
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Quality Trends East versus West Feeds
Consistent east-to-west periodic quality Correlation is useful for determining errors in East feed Could be used to catch errors before they hit the west
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Junk in, junk out If what your receive is poor quality only perceptual quality
tools will “see” it...and your customers Poor quality passes thru the system to all the viewers Perceptual quality monitoring identifies content issues to
compliment QoE/QoS
Perceptual Quality Monitoring is essential to both traditional video delivery and newer streaming techniques
“So What”
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Working with Programmers Scorecards: Provide each a ranking of their channel(s)
weekly & monthly Identify periodic quality issues: paid programming, shows,
remotes
Empowering Operations Is the issue the programmer or in “our” network? Is the issue the encoding or distribution? Is the issue visible to the subscriber? How often does this happen?
Reducing Cost CSRs: We are aware of the problem CSRs: This is typical for this time of day CSRs & Operations: Reduction in trouble tickets
“So What”
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Perceptual Quality Monitoring (PQM) Models the human eye to find visual artifacts Identifies baseline quality & trends; and alerts at ingest &
encode Replaces manual methods of video monitoring at the
Headend
End to End Video Management QoS to determine network fidelity
QoE to estimate QoS and MPEG impacts on subscribers
PQM to objectively determine video quality
QoS, QoE and PQM correlation achieves:
• Prioritization of issues based on impact
• Faster time-to-fix and isolation of issues
• Reduction in costs & increases customer satisfaction
Summary