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Evaluating the Effectiveness of Automatic PVR Management

Evaluating the Effectiveness of Automatic PVR Management. Ketan Mayer-Patel Wesley Miaw. Personal Video Recorders. Time-shifted viewing Show archiving Hundreds of hours worth of storage “TV Guide” integration Recommendations. PVR Recommendation. Pros: Total awareness

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Evaluating the Effectiveness of Automatic PVR Management

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  1. Evaluating the Effectiveness of Automatic PVR Management Ketan Mayer-Patel Wesley Miaw

  2. Personal Video Recorders • Time-shifted viewing • Show archiving • Hundreds of hours worth of storage • “TV Guide” integration • Recommendations

  3. PVR Recommendation • Pros: • Total awareness • Learned viewing preferences • Cons: • Inaccurate PVR: Total awareness + Error vs. Human: Limited awareness + No error

  4. 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.

  5. PVR Model • Number of Channels • Viewer Consumption Rate • Content Utility Distribution [0,1] • Utility Decay Rate • Selection Policy (Automatic or Manual)

  6. The Tradeoff • 200 channels • 8 half-hour shows viewed each day • CUD gaussian z=10 • 0.975 decay factor

  7. Channels • X channels • 8 half-hour shows viewed each day • CUD gaussian z=10 • 0.975 decay factor

  8. Consumption Rate • 200 channels • X half-hour shows viewed each day • CUD gaussian z=10 • 0.975 decay factor

  9. Content Utility Distribution • 200 channels • 8 half-hour shows viewed each day • CUD gaussian z=X • 0.975 decay factor

  10. Decay Rate • 200 channels • 8 half-hour shows viewed each day • CUD gaussian z=10 • X decay factor

  11. 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.

  12. Looking Ahead • Available content is overwhelming • Hundreds of channels • Thousands of program hours each day • Broadcast is necessary • Video requires ~1GB/hour

  13. 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

  14. Resources • http://www.wesman.net/~wesley/presentations/pvr.ppt • http://www.wesman.net/~wesley/papers/pvr.pdf • wesley@wesman.net

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