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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Evaluating the Effectiveness of Automatic PVR ManagementKetan Mayer-PatelWesley Miaw
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Personal Video Recorders• Time-shifted viewing• Show archiving• Hundreds of hours worth of storage• “TV Guide” integration• Recommendations
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
PVR Recommendation
• Pros:♦ Total awareness♦ Learned viewing preferences
• Cons:♦ Inaccurate
PVR: Total awareness + Errorvs.
Human: Limited awareness + No error
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Simulation
• 180 days• PVR capacity: 100 half-hour
shows• Each half hour, save show of
highest utility.• Delete programs of lowest utility
as necessary.• End of day, compute total utility
and delete consumed shows.• First week ignored.
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
PVR Model
• Number of Channels• Viewer Consumption Rate• Content Utility Distribution
[0,1]• Utility Decay Rate• Selection Policy (Automatic or
Manual)
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
The Tradeoff
• 200 channels• 8 half-hour shows
viewed each day
• CUD gaussian z=10• 0.975 decay factor
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Channels
• X channels• 8 half-hour shows
viewed each day
• CUD gaussian z=10• 0.975 decay factor
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Consumption Rate
• 200 channels• X half-hour shows
viewed each day
• CUD gaussian z=10• 0.975 decay factor
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Content Utility Distribution
• 200 channels• 8 half-hour shows
viewed each day
• CUD gaussian z=X• 0.975 decay factor
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Decay Rate
• 200 channels• 8 half-hour shows
viewed each day
• CUD gaussian z=10• X decay factor
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Conclusion
• Margin of error has very little effect on automatic policy performance.
• Even if the automatic policy has very small error, a human with sufficiently high awareness will beat it.
• The automatic policy is useful to very unaware or very picky people.
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Looking Ahead
• Available content is overwhelming♦ Hundreds of channels♦ Thousands of program hours each day
• Broadcast is necessary♦ Video requires ~1GB/hour
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Recommendation Silliness• “I recorded an episode of Oprah…it
started recording all kinds of BET and hip-hop shows.” – Rapunzel
• “I taped a few Spanish-language soccer games…a year later stuff in Spanish is constantly being suggested to me.” – Matt
http://www.pvrblog.com/pvr/2003/07/pvrs_and_the_ga.html
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The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Resources
• http://www.wesman.net/~wesley/presentations/pvr.ppt
• http://www.wesman.net/~wesley/papers/pvr.pdf