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<p class="MsoNormal">Hi can I possibly get some advice from the experts here.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are porting the live555 server to one of our embedded devices (set top box) with the intention to be able to multicast a service received via DVB-T to clients on the wifi network using rtp.<o:p></o:p></p>
<p class="MsoNormal">The target server is a Broadcom based system running linux 3.3.8 kernel.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The first step is to cross compile the test programs and verify functionality streaming a file from the devices hard drive over the wifi network.<o:p></o:p></p>
<p class="MsoNormal">Porting to mips was straight forward thanks to a well thought out configuration option on your teams side. The only change required to compile was to add -DLOCALE_NOT_USED to the configuration file.<o:p></o:p></p>
<p class="MsoNormal">I used the config.armlinux as a base to create a config.mips with the ony change required being to change the compiler to CROSS_COMPILE?= mipsel-linux-<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Using the test transport stream from the live555 website “bipbop-gear1-all.ts” I ran the program testMPEG2TransportStreamer
<o:p></o:p></p>
<p class="MsoNormal">Using a windows VLC client I could not play the file back however when I switched to an android client on a tablet (Media Plaver by video experts group) I managed to receive the stream.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Problem is that with this stream I get a significant amount of video breakup, if I switch to a higher bitrate stream I get enough breakup to no be able to run video at all.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Using a PC I did a tcpdump of the multicast and playing back this dump with a windows player I get the same breakup, so this then rules out the android client.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am now working on getting a wired ethernet port to run on this platform so that I may rule out packet loss from the wifi side.<o:p></o:p></p>
<p class="MsoNormal">If this proves to be the same then I need to look at what is happening in the live555 side.<o:p></o:p></p>
<p class="MsoNormal">Can I ask for any pointers in where may be a good place to look? Does the framework try to perform any sort of transcoding or repacking of the stream, and if so where about can I look at that?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Today I modified the code in groupsock.cpp to write output to the disk rather than to the network. When I attempt to playback this written file I get the same picture breakup so I am now confident that the losses are somewhere in the live555
framework, but I am not sure where else to look.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Anthony<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial","sans-serif";mso-fareast-language:EN-ZA">Anthony Desmarais, Team Leader:
</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#666666;mso-fareast-language:EN-ZA">Software Platforms</span><span lang="EN-US" style="mso-fareast-language:EN-ZA"><o:p></o:p></span></p>
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