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Mystery solved, thanks so much.</div>
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-Abrar</div>
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<div><span style="font-family: "Yu Gothic", 游ゴシック, YuGothic, sans-serif; font-size: 15px;">ーーーーーーーーー</span></div>
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<span lang="JA" style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; color:rgb(32,31,30)"><span style="font-family:"Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif;font-size:15px;text-align:start;background-color:rgb(255, 255, 255);display:inline !important"><span style="font-family:"Yu Gothic", 游ゴシック, YuGothic, sans-serif;font-size:14.6667px;text-align:left;background-color:rgb(255, 255, 255);display:inline !important">アブラル・ザヒン<span style="background-color:rgb(255, 255, 255);display:inline !important">・</span><span style="background-color:rgb(255, 255, 255);display:inline !important">シャハリアル<span> </span></span></span></span><span style="font-family: "Yu Gothic", 游ゴシック, YuGothic, sans-serif; font-size: 15px; text-align: start; background-color: rgb(255, 255, 255); display: inline !important;">
(Abrar Zahin Shahriar</span><span style="font-family: "Yu Gothic", 游ゴシック, YuGothic, sans-serif; font-size: 15px; text-align: start; background-color: rgb(255, 255, 255); display: inline !important;">)</span><br style="font-family:"Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif;font-size:15px;text-align:start;background-color:rgb(255, 255, 255)">
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Nirbheek Chauhan <nirbheek.chauhan@gmail.com><br>
<b>Sent:</b> Tuesday, May 24, 2022 3:46 PM<br>
<b>To:</b> Discussion of the development of and with GStreamer <gstreamer-devel@lists.freedesktop.org><br>
<b>Cc:</b> Abrar Shahriar <abrar.shahriar@hiperdyne.com><br>
<b>Subject:</b> Re: audiolatency Plugin Values Shows High Values In Certain Cases</font>
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<div>Hi Abrar,</div>
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<div>With autoaudiosrc and autoaudiosink, the pipeline will automatically plug appropriate elements with default configuration. For instance on my system this is what it looks like:</div>
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<div>$ gst-launch-1.0 autoaudiosrc ! audiolatency print-latency=true ! autoaudiosink<br>
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<div>[...]<br>
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<div>last latency: 7ms, running average: 7ms<br>
last latency: 190ms, running average: 99ms<br>
last latency: 178ms, running average: 125ms<br>
last latency: 195ms, running average: 143ms<br>
last latency: 172ms, running average: 149ms<br>
last latency: 194ms, running average: 186ms<br>
last latency: 195ms, running average: 187ms<br>
last latency: 188ms, running average: 189ms<br>
last latency: 190ms, running average: 188ms<br>
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<div>If we directly use the elements auto-plugged by autoaudiosrc / autoaudiosink, we get the same latency:</div>
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<div>$ gst-launch-1.0 pulsesrc ! audiolatency print-latency=true ! pulsesink </div>
<div>[...]<br>
last latency: 191ms, running average: 191ms<br>
last latency: 189ms, running average: 190ms<br>
last latency: 204ms, running average: 195ms<br>
last latency: 190ms, running average: 194ms<br>
last latency: 182ms, running average: 191ms<br>
last latency: 180ms, running average: 189ms<br>
last latency: 176ms, running average: 186ms</div>
<div><br>
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<div>But if we tweak the appropriate properties, the latency goes down:</div>
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<div>$ gst-launch-1.0 pulsesrc buffer-time=20000 latency-time=10000 ! audiolatency print-latency=true ! pulsesink buffer-time=20000 latency-time=10000<br>
last latency: 14ms, running average: 14ms<br>
last latency: 60ms, running average: 37ms<br>
last latency: 58ms, running average: 44ms<br>
last latency: 58ms, running average: 48ms<br>
last latency: 52ms, running average: 48ms<br>
last latency: 52ms, running average: 56ms</div>
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<div>buffer-time and latency-time control parameters for the audio ringbuffer. buffer-time is the total size of the ringbuffer (max-latency) and latency-time is the size of each read / write to that ringbuffer (min-latency). The lowest possible values depend
on the audio hardware, audio drivers, sound server, real-time priority of the app, available CPU, etc.</div>
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<div>You will get the lowest latency with pipewire or JACK on Linux, wasapi2 or ASIO on Windows, and CoreAudio (osxaudiosrc / sink) on macOS.</div>
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<div>With wasapi, wasapi2, and jack you can set low-latency=true to ask the element to auto-configure to a low latency value.<br>
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<div>Cheers,</div>
<div>Nirbheek<br>
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<div dir="ltr" class="x_gmail_attr">On Mon, May 23, 2022 at 3:30 PM Abrar Shahriar via gstreamer-devel <<a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a>> wrote:<br>
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Hi,</div>
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I have been using audiolatency with some custom Gst apps, it usually shows 40-50ms, but when using the sample cmd line pipeline (
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<pre style="background:rgba(0,0,0,0) none repeat scroll 0% 0%; border:0px none; margin:0px">gst<span>-</span>launch<span>-</span><span style="color:rgb(85,87,83)">1.0</span> <span>-</span>v autoaudiosrc <span>!</span> audiolatency print<span>-</span>latency<span>=</span><span style="color:rgb(78,154,6)">true</span> <span>!</span> autoaudiosink</pre>
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), it shows around 200-300ms.<br>
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I made a custom app mirroring the sample pipeline, this app also shows 200-300ms. </div>
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There is usually a big jump after the first print like so-</div>
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last latency: 44ms, running average: 44ms
<div>last latency: 1025ms, running average: 535ms</div>
<div>last latency: 175ms, running average: 415ms</div>
<div>last latency: 215ms, running average: 365ms</div>
<div>last latency: 173ms, running average: 326ms</div>
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<div><span style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; font-size:12pt; color:rgb(0,0,0)">What is the mechanism behind this? Is there a way to constantly get 40-50ms?</span><br>
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<div><font face="Yu Gothic, 游ゴシック, YuGothic, sans-serif" color="#201f1e"><span style="font-size:14.6667px">-Abrar</span></font></div>
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<div><span style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; font-size:15px">ーーーーーーーーー</span></div>
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<span lang="JA" style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; color:rgb(32,31,30)"><span style="font-size:15px; text-align:start; background-color:rgb(255,255,255); display:inline"><span style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; font-size:14.6667px; text-align:left; background-color:rgb(255,255,255); display:inline">アブラル・ザヒン<span style="background-color:rgb(255,255,255); display:inline">・</span><span style="background-color:rgb(255,255,255); display:inline">シャハリアル<span> </span></span></span></span><span style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; font-size:15px; text-align:start; background-color:rgb(255,255,255); display:inline">
(Abrar Zahin Shahriar</span><span style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; font-size:15px; text-align:start; background-color:rgb(255,255,255); display:inline">)</span><br style="font-size:15px; text-align:start; background-color:rgb(255,255,255)">
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<span style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; font-size:15px; text-align:start; background-color:rgb(255,255,255); display:inline">ハイパーダイン株式会社</span><br style="font-size:15px; text-align:start; background-color:rgb(255,255,255)">
<span style="font-family:"Yu Gothic",游ゴシック,YuGothic,sans-serif; font-size:15px; text-align:start; background-color:rgb(255,255,255); display:inline">〒108－0014 東京都港区芝5丁目9－12 3階</span><br>
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