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<p class="MsoNormal"><span style="color:#1F497D">Michael,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Please see my ‘Avi movie file has extra data – update2’ posted Mon 2/6/2017 11:35 AM.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">To do this you can go to the link below
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <a href="https://lists.freedesktop.org/archives/gstreamer-devel/">
https://lists.freedesktop.org/archives/gstreamer-devel/</a> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">and view the February 2017 archive by Author. I explain where the initial play delay is coming from.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Bill <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<b>From:</b> gstreamer-devel [mailto:gstreamer-devel-bounces@lists.freedesktop.org]
<b>On Behalf Of </b>Michael Yarochkin<br>
<b>Sent:</b> Monday, February 13, 2017 6:33 AM<br>
<b>To:</b> Gst Dev (gstreamer-devel@lists.freedesktop.org) <gstreamer-devel@lists.freedesktop.org><br>
<b>Subject:</b> Re: Avi movie file has extra data<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p><span style="font-family:"Calibri",sans-serif;color:black">Hello, William<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">I am not an expert in RTP, but will need in in future development.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Can i ask you more details? Maybe by answering you can help you self also.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">My guess of delay:<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">-</span><span style="font-family:"Calibri",sans-serif;color:#212121"> latency=6000. but not really plausible</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:#212121">-rate and clock-rate. you have it different in many places. can 48000/8000 be a reason of your "about 5 sec" delay?</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:#212121">Did you played with this parameters?</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:#212121">Mikl</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<b><span style="color:black">From:</span></b><span style="color:black"> gstreamer-devel <<a href="mailto:gstreamer-devel-bounces@lists.freedesktop.org">gstreamer-devel-bounces@lists.freedesktop.org</a>> on behalf of William Salibrici <<a href="mailto:bsalibrici@latticeinc.com">bsalibrici@latticeinc.com</a>><br>
<b>Sent:</b> Wednesday, February 1, 2017 3:35:12 PM<br>
<b>To:</b> Gst Dev (<a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a>)<br>
<b>Subject:</b> Avi movie file has extra data</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif">
<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Times New Roman",serif"> <o:p></o:p></span></p>
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<p class="MsoNormal">The following pipeline works ok and produces an avi movie file. My development machine is windows 7 and I’m using GStreamer 1.8.2 with your windows pre-built binaries.
<o:p></o:p></p>
<p class="MsoListParagraphCxSpFirst">gst-launch-1.0.exe -e <o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"><o:p> </o:p></p>
<p class="MsoListParagraphCxSpMiddle">avimux name=mux ! filesink location=C:/myfile.avi
<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle">sync=true <o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"><o:p> </o:p></p>
<p class="MsoListParagraphCxSpMiddle">rtpbin latency=6000 name=rtpbin_A <o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"><o:p> </o:p></p>
<p class="MsoListParagraphCxSpMiddle">udpsrc address="192.168.1.101" port=5018 <o:p>
</o:p></p>
<p class="MsoListParagraphCxSpMiddle">caps="application/x-rtp,media=video,payload=97,clock-rate=90000,encoding-name=VP8" !
<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"><o:p> </o:p></p>
<p class="MsoListParagraphCxSpMiddle">rtpbin_A.recv_rtp_sink_0 <o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle">rtpbin_A. ! rtpvp8depay ! avdec_vp8 output-corrupt=true ! videoconvert ! videorate ! videoscale !
<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle">capsfilter caps="video/x-raw,height=288,width=352,framerate=30/1" !
<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle">avenc_mpeg4 ! queue ! mux. <o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"><o:p> </o:p></p>
<p class="MsoListParagraphCxSpMiddle">udpsrc address="192.168.1.101" port=5020 <o:p>
</o:p></p>
<p class="MsoListParagraphCxSpMiddle">caps="application/x-rtp,media=audio,clock-rate=48000,encoding-name=OPUS,payload=96" !
<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"><o:p> </o:p></p>
<p class="MsoListParagraphCxSpMiddle">rtpbin_A.recv_rtp_sink_1 <o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle">rtpbin_A. ! rtpopusdepay ! opusdec ! audioconvert ! audiorate !
<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle">capsfilter caps="audio/x-raw,format=S16LE,rate=8000,channels=1" !
<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle">mulawenc ! queue ! mux.<o:p></o:p></p>
<p class="MsoListParagraphCxSpLast" style="margin-left:0in;mso-add-space:auto"><o:p> </o:p></p>
<p class="MsoNormal">I can use the standard Windows media player to play the resultant avi file. However, there are two problems:<o:p></o:p></p>
<p class="MsoListParagraphCxSpFirst" style="text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The avi file length is about 5 seconds longer that it should be.<o:p></o:p></p>
<p class="MsoListParagraphCxSpLast" style="text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>When I play the movie, there is about a 5 second delay in the beginning before it starts to play. The first video frame appears frozen during this initial delay.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Once the movie starts to play it is all ok. All the audio and video data is there and the audio and video are in sync.
<o:p></o:p></p>
<p class="MsoNormal">I tried changing the rtpbin latency but that did not correct the problem.
<o:p></o:p></p>
<p class="MsoNormal">Can anyone tell me what is causing this extra data in the avi file and the initial play delay, and what changes should be made to the above pipeline to eliminate it? Also, does anyone know of an open source avi file chunk viewer? I did
a quick google search but have not found anything so far. I would like to see what data is actually in the avi file.
<o:p></o:p></p>
<p class="MsoNormal">Thanks so much for your help, <o:p></o:p></p>
<p class="MsoNormal">Bill <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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