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<title>Re: [Live-devel] Streaming with Sensoray 2250 encoded data</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ross,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Don’t worry about answering my last
email, I was able to get the live code working with my encoder. It works great,
I appreciate all the work you have done on this project. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>On another note, to you and everyone else
that might see this email, does anyone have any tips for optimizing latency when
streaming live video through this library? Now that I have my encoder working,
I am getting video on the client machine which is only delayed about 1-1.5
seconds from real time. Any suggestions for optimizing it a little more? I am
streaming to the client wirelessly, but I have already tried it over a wired
LAN, same delay results. Thanks to anyone who can help.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-<st1:country-region w:st="on"><st1:place
w:st="on">Jordan</st1:place></st1:country-region><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
live-devel-bounces@ns.live555.com [mailto:live-devel-bounces@ns.live555.com] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Ross Finlayson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, July 17, 2007 12:12
PM<br>
<b><span style='font-weight:bold'>To:</span></b> LIVE555 Streaming Media -
development & use<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Live-devel]
Streaming with Sensoray 2250 encoded data</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am trying to stream video from a platform that has a
Sensoray 2250 encoder installed on it. I have already verified that all of the
hardware works and that data produced from it can be streamed using the live
library by doing the following:</span></font><o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite cite>
<p class=MsoNormal><font size=2 face=Symbol><span style='font-size:10.0pt;
font-family:Symbol'>·</span></font><font size=1><span style='font-size:7.5pt'> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Created a
process that grabs MPEG2 frames from the encoder and dumps them to a named pipe</span></font><o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite cite>
<p class=MsoNormal><font size=2 face=Symbol><span style='font-size:10.0pt;
font-family:Symbol'>·</span></font><font size=1><span style='font-size:7.5pt'> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Modified
testMPEG1or2VideoStreamer to look at this pipe for data, and stream it to a
specified IP address</span></font><o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite cite>
<p class=MsoNormal><font size=2 face=Symbol><span style='font-size:10.0pt;
font-family:Symbol'>·</span></font><font size=1><span style='font-size:7.5pt'> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Works fine,
except that, as you can image, there is some major delay in the video which I
cannot have due to the nature of what this video stream is being used for.</span></font><o:p></o:p></p>
</blockquote>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>You can probably eliminate most of this delay by reducing the maximum
buffering used by your pipe. (I don't know how you would do this, but
there should be a way.)<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>This method - piping encoded data directly to the (modified)
"testMPEG1or2VideoStreamer" is *by far* the easiest way to get what
you want. I recommend sticking with this approach if you can.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite cite>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font><o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite cite>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I decided to move on and write a FramedSource subclass that
encapsulates my encoder, and deliver this object directly to a
MPEG1or2VideoRTPSink.</span></font><o:p></o:p></p>
</blockquote>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>You should insert a "MPEG1or2VideoStreamDiscreteFramer" in
front of your "MPEG1or2VideoRTPSink".<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite cite>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The thing that is very odd is that it seems like my
implementation of doGetNextFrame() is never executed</span></font><o:p></o:p></p>
</blockquote>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>You should first make sure that you can walk before you try to
run. I suggest that you begin by trying to write your encoded data to a
file rather than streaming it over a network. I.e., start by using a
"FileSink" instead of a "MPEG1or2VideoRTPSink". Once
you have shown that you can successfully write your encoded data into a file
(and test that the data is correct by trying to play the file in a media
player), then it would make sense to move to streaming.<o:p></o:p></span></font></p>
</div>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><x-sigsep>-- <o:p></o:p></span></font></pre>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
</x-sigsep>Ross Finlayson<br>
Live Networks, Inc.<br>
http://www.live555.com/<o:p></o:p></span></font></p>
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