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School of Computing Science Simon Fraser University

School of Computing Science Simon Fraser University. Power Consumption of Google Android’s Video Decoder Mathieu Spénard. Outline. Goal How the experiment was conducted Experiment results Challenges and Difficulties Conclusion. Goal.

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School of Computing Science Simon Fraser University

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  1. School of Computing ScienceSimon Fraser University Power Consumption of Google Android’s Video Decoder Mathieu Spénard

  2. Outline • Goal • How the experimentwasconducted • Experimentresults • Challenges and Difficulties • Conclusion

  3. Goal • Understand how a videodecoder consumes power within a cell phone, whenrenderin H.264/AVC encodedvideos • Experimentdone on a real phone, not a chip • Understand how variousprocessesinvolved in a phone impacts the overall power consumption of rendering a video

  4. Tools Used • Power Tutor [1], whichallowsmeasuring power on the phone using a software with a 5% accuracy for the HTC G1, HTC G2 and Nexus One • Ffmpeg [2] to encode videos • City, Crew and Foremanvideosequences [3] • Linda File Manager [4], a free file management system thatallows for quicklynavigating files within an Android phone

  5. Experiment • Encoded City, Crew and Foremanusingffmpeg • 30fps • CIF • Bitratesfrom 100kbps to 3000kpbs • Noted the mean Y-PSNR • Transfer the files to a Google Nexus One phone • Set it to plane mode (no 3G antenna/WiFi) • Start PowerTutor • Using Linda Manager, navigate and start an encodedvideo • Whenitis over, stop PowerTutor, save the log and renameitsoitiseasy to retrieve • Repeat for all encodedvideos

  6. Results

  7. Results

  8. Results

  9. Results • Videodecodercouldn’tplayvideosencodedat 2000, 2250 and 2500 kbps, and alsofrom 4000 to 5000 kbps • Couldn’t stop the Compassprocess. Consumes verylittle power, but couldadd to the operating system overhead

  10. Challenges and Difficulties • Was not parsing the right data at the beginning • PowerTutoris slow • PowerTutor has a toocoarsegranularity • Not a lot of precision for the OLED screen power consumptionbecause of an unrooted phone (brightnessonly)

  11. Conclusion • Bitrate and mean Y-PSNR do have an impact on the power consumption of a H.264/AVC videodecoder • System overhead consumes more power thandecoding • Screen consumes most of power; does not leave a lot of room for improvement • A studyusing a 3D videodecodercouldgive a differentdecoder/screen power consumption

  12. References • [1] “PowerTutor,” http://ziyang.eecs.umich.edu/projects/powertutor/ • [2] “FFmpeg.” [Online]. Available: http://www.ffmpeg.org/ • [3] “Video Library and Tools - NSL.” [Online]. Available: http://nsl.cs.sfu.ca/wiki/index.php/Video_Library_and_Tools • [4] “Linda File Manager.” [Online].Available: http://www.androlib.com/android.application.com/lindaandny-lindamanager-jpBj.aspx

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