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<p class="MsoNormal">Dear community,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m afraid I’m stuck with some artifacts I have to be able to explain and maybe even control.
<o:p></o:p></p>
<p class="MsoNormal">I appreciate every small hint in a good direction either towards a paper or to the right existing reference.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">While experimenting with video streaming over TCP in equilibrium situations, I found several artifacts.<o:p></o:p></p>
<p class="MsoNormal">The environment was as follows. 3 video streaming servers (Windows XP) based on TCP were streaming to 3 receivers
<o:p></o:p></p>
<p class="MsoNormal">in a local network over a bottleneck node.<o:p></o:p></p>
<p class="MsoNormal">Variations on the this setup were {wireless | wired}, {receiver Linux| receiver WinXP}, distance from
<o:p></o:p></p>
<p class="MsoNormal">base station (in wireless), number of network nodes in between, inclusion/exclusion of a token bucket filter
<br>
node for bandwidth limitation.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In all the experiments, I permutated the receivers, and run each permutation for 20 to 50 times.
<o:p></o:p></p>
<p class="MsoNormal">The streamed video sequence was 6 Mbit/s and 560 seconds long.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The artifacts I achieved were: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>In sum, the bitrates achieved were not fair (as in ‘close to equal’)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>The bit rate ratios stayed stable most of the time.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Sometimes ratios switch, turning the best performer into the worst performer.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:18.0pt"><o:p> </o:p></p>
<p class="MsoNormal">I wonder if these phenomena are known and studied or not even worth the effort thinking of it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you very much for your time and consideration and I’m looking forward to hearing from you.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Yours sincerely, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Matthias Krause<o:p></o:p></p>
<p class="MsoNormal">Philips Research<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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