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Am 5.12.2011 23:36, schrieb <a class="moz-txt-link-abbreviated" href="mailto:david.weber@l-3com.com:">david.weber@l-3com.com:</a>
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<p class="MsoNormal">I am attempting to write a mpeg-ts
application. Step one
would be getting an existing application working, so I can
dissect the code.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, I first took output-example (and the
latest release),
and modified the av_guess_format to:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New"">fmt
=
av_guess_format("mpegts", NULL, NULL);<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I also modify the STREAM_DURATION to be
very long (500000)
or so. I know this will be an issue, but I'm trying to get it
working.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I compile and run it, wishing to write to
the network, and
then read it locally using ffplay/vlc.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New"">[root@sl6
src]#
./output-example rtp://192.168.1.2:9778<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New"">Output
#0,
mpegts, to 'rtp://192.168.1.2:9778':<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New"">
Stream
#0.0: Video: mpeg2video, yuv420p, 352x288, q=2-31, 400 kb/s,
90k tbn, 25
tbc<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New"">
Stream
#0.1: Audio: mp2, 44100 Hz, 2 channels, s16, 64 kb/s<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier New"">[mpegts
@
0x8324020] muxrate VBR, pcr every 2 pkts, sdt every 200,
pat/pmt every 40 pkts<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I then try VLC, where I play network stream
"rtp://192.168.1.2:9778" (this is on the same machine as the
sender).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">No output. Under messages, it says "rtp
warning: too
many RTP sessions".<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, I check wireshark, and when VLC is not
running, I am
getting icmp port not open messages, and those go away when I
start VLC.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any thoughts? Something not quite set up
right in the TS options?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<br>
</div>
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<br>
Hi,<br>
<br>
the format mpegts changes are right (<span
style="font-size:8.0pt;font-family:"Courier New"">fmt
= av_guess_format("mpegts", NULL, NULL);</span>). The problem is,
that if you have the format MPEG-TS libav don't use rtp as output
method. Try to open the stream in vlc with udp://192.168.1.2:9778.
To output mpegts with rtp you have to do more than adapting the
output example, look at the mailinglist thread
<a class="moz-txt-link-freetext" href="http://libav-users.943685.n4.nabble.com/Output-mpeg-ts-to-rtp-td2234066.html">http://libav-users.943685.n4.nabble.com/Output-mpeg-ts-to-rtp-td2234066.html</a>.
<br>
<br>
Steffen<br>
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