<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Exchange Server"> <style></style> </head> <body> <meta content="text/html; charset=UTF-8"> <style type="text/css" style="">  </style> <div dir="ltr"> <div id="x_divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Arial,Helvetica,sans-serif"> <p>Hello, <span style="color:rgb(33,33,33); font-size:13.3333px">Antoine</span></p> <p><span style="color:rgb(33,33,33); font-size:13.3333px"><br> </span></p> <p><span style="color:rgb(33,33,33); font-size:13.3333px">I am using subtitles inside of matroska for the same task.</span></p> <p><span style="color:rgb(33,33,33); font-size:13.3333px"><br> </span></p> <p><span style="color:rgb(33,33,33); font-size:13.3333px">Mikl</span></p> </div> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> gstreamer-devel <gstreamer-devel-bounces@lists.freedesktop.org> on behalf of Antoine Martin <antoine@nagafix.co.uk><br> <b>Sent:</b> Wednesday, February 15, 2017 12:11:10 PM<br> <b>To:</b> gstreamer-devel@lists.freedesktop.org<br> <b>Subject:</b> absolute buffer timestamp from src element</font> <div> </div> </div> </div> <font size="2"><span style="font-size:10pt;"> <div class="PlainText">Hi,<br> <br> I have a simple pipeline that looks like this:<br> pulsesrc ! queue ! opusenc ! oggmux ! appsink<br> I would like to capture the absolute unix timestamp of the buffers as<br> they get captured by pulsesrc.<br> I can get the "timestamp" property of the buffers, but this starts at zero..<br> <br> I need this timestamp in a format that I can reconcile with external<br> data that will captured around the same time, but not through gstreamer.<br> <br> I guess we could use the pipeline latency to retroactively calculate the<br> actual absolute timestamp, but I could never figure out how to get the<br> pipeline latency using the python bindings:<br> <a href="http://gstreamer-devel.966125.n4.nabble.com/latency-queries-tt4676750.html#none">http://gstreamer-devel.966125.n4.nabble.com/latency-queries-tt4676750.html#none</a><br> <br> The only other solution I can think of would be to write a filter that<br> adds a property or keeps track of the delta between the buffer timestamp<br> and a point of reference. (would this property be preserved through the<br> encoder and muxer?)<br> <br> Is there a better way?<br> <br> Thank<br> Antoine<br> _______________________________________________<br> gstreamer-devel mailing list<br> gstreamer-devel@lists.freedesktop.org<br> <a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a><br> </div> </span></font> </body> </html>