http:^^www.cs.cornell.edu^info^projects^zeno^projects^opme^index.html

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Date: Sunday, 01-Dec-96 19:13:11 GMT
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<html><head><title>Optimal Parallel MPEG Encoding : A Parallel MPEG Encoder in Rivl</title></head><body BGCOLOR="#BBBBBB"><table><tr>  <td> <!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><img src="http://www.cs.cornell.edu/Info/Projects/zeno/images/logo-small.gif"></td>  <td> <h2>Optimal Parallel MPEG Encoding</h2></td></table><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><img src="http://www.cs.cornell.edu/Info/Projects/zeno/images/alum.gif"><p><H2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><IMG SRC="http://www.cs.cornell.edu/Info/Projects/zeno/images/ping.gif">...And just what is this madness???</H2>In the beginning in a lab deep in the heart of Upson Hall, there werevideo tapes of classroom lectures.  These tapes were on the shelfcollecting dust bunnies.  What were we to do about this?  Well, BrianSmith decided that he wanted his lectures put online for his studentsto view and thus began using <!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><ahref="http://simon.cs.cornell.edu/Info/Projects/zeno/Projects/Rivl.html">RIVL</a>to compress his videos.  He soon realized that compressing everylecture would take an inordinate amount of time.  He calculated thatif we could use every machine in the computer science department, itwould not take nearly as long to perform this task.  We decided itwould be fun to help Brian out with his problem, so we came up with an<!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><a href="http://www.cs.cornell.edu/Info/Projects/zeno/Projects/OPME/abstract.html">abstract</a> to solve hisproblem.  We all agreed that it was a good place to start.  After sometime (and a lot of labor) we came up with some code and a <!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><ahref="http://www.cs.cornell.edu/Info/Projects/zeno/Projects/OPME/opme.report.html">paper</a>based on our work which more closely resembles a collection of notesthan a coherent piece of work.  So, we kept working.  We have nowarrived at another version of our code.  This version works muchbetter than before; it is better, stronger, and faster.  And to thisend, we have written <!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><ahref="http://www.cs.cornell.edu/Info/Projects/zeno/Projects/OPME/tech_paper.html">another technical paper</a>to describe exactly what we did and why we did it.<p><H2><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><IMG SRC="http://www.cs.cornell.edu/Info/Projects/zeno/images/ping.gif">...and what do we learn from this?</H2>Lots!  We now know the intimate details of how TCL, DP, and RIVL workand why performance suffers when certain things are done.  Masteringthe black art of TCL programming actually took the smallest amount oftime in comparison to the rest of code.  Squeezing the mostperformance out of a single-threaded, event-driven environment given adistributed architecture turned out to be the most time consuming anddifficult part of the project.  RPC facilities built into DP allowedus to easily perform necessary communication between machines todistribute work requests.  The combination of the above scriptingenvironments helped us to acheive our goals of delivering reliable,portable, high performance MPEG encoding.<p><H2><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><IMG SRC="http://www.cs.cornell.edu/Info/Projects/zeno/images/ping.gif">...and how does it tie in withMultimedia Systems?</H2>Very well!  The ability to rapidly compress video using all availablemachines makes many new types of video processing possible.  It allowsanimators and movie editors to view their videos more often, thusshortening development time.  Because our version of parallel MPEGencoding is an integral part of RIVL, it is extremely easy to use.<p><H2><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><IMG SRC="http://www.cs.cornell.edu/Info/Projects/zeno/images/ping.gif">...and how do we measure success?</H2>If we are able to compress a large video without becoming old andgray, we will have succeeded.<H2><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><IMG SRC="http://www.cs.cornell.edu/Info/Projects/zeno/images/ping.gif">...and <i>finally</i>, how are we progressing?</H2>We are finished with the coding state of the project.  Currently, weare working writing a technical report for the project.  Hopefully wecan pull the main ideas together better than we did earlier.  Some ofthings that could be done to make this project better are:<ol><li>Make the worker process into a daemon process.<li>Add in support for IP Multi-cast.</ol><br><hr><br><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><img src="http://www.cs.cornell.edu/Info/Projects/zeno/images/alum.gif"><h2>People Working on Optimal Parallel MPEG Encoder</h3><h3>Faculty</h3><ul><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><img src="http://www.cs.cornell.edu/Info/Projects/zeno/images/greyball.gif"> <!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><a href="http://www.cs.cornell.edu/Info/Faculty/Brian_Smith.html"> Brian Smith</a> <br><br></ul><h3>M.Eng Students</h3><ul>  <!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><img src="http://www.cs.cornell.edu/Info/Projects/zeno/images/yellowball.gif">  <!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><a href ="http://www.cs.cornell.edu/Info/People/spdawson/home.html">Scott Dawson</a>  <br><br>  <!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><img src="http://www.cs.cornell.edu/Info/Projects/zeno/images/yellowball.gif">  <!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><a href ="http://www.cs.cornell.edu/Info/People/wwlee/index.html">William Lee</a>  <br><br>  <!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><img src="http://www.cs.cornell.edu/Info/Projects/zeno/images/yellowball.gif">  <!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><a href ="http://www.cs.cornell.edu/Info/People/jmm/index.html">Jeff Moore</a>  <br><br></ul><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><img src="http://www.cs.cornell.edu/Info/Projects/zeno/images/alum.gif"><br><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><a href ="http://www.cs.cornell.edu/Info/Projects/zeno/Welcome.html"><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><img src ="http://www.cs.cornell.edu/Info/Projects/zeno/images/home.gif"></a><!IMG SRC="/cgi-bin/bsmith/nph-count?width=5&link=/Projects/zeno/OPME">Visitors since April 25th, 1996<!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><IMG SRC="http://counter.digits.com/bin/web_counter?-d&6&mulvaOPME"ALIGN=absmiddle WIDTH=90 HEIGHT=20 BORDER=0></html>

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