Talks I've given. Many more at https://speakerdeck.com/captn3m0
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h6{color:currentColor}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]{display:block!important;padding:0!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#p>svg>foreignObject>section[data-marpit-advanced-background=content],div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1">
<h1>everything i learned about streaming video in linux</h1>
<p>-nemo</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2">
<h1>demo</h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3">
<h1>let's talk about X11</h1>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>+-------------------------+
|<span class="hljs-string"> input devices </span>|
|<span class="hljs-string"> keyboard </span>|<span class="hljs-string"> mouse </span>|
+-------^---+-^-----------+
|<span class="hljs-string"> </span>|
|<span class="hljs-string"> </span>|<span class="hljs-string"> +------------------------+
+-v-----v-------+--------&gt;+ </span>|
|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|
|<span class="hljs-string"> X Server +--------&gt;+ </span>|
|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|
+--+---------+--+--------&gt;+ Screen |<span class="hljs-string">
^ ^ </span>|<span class="hljs-string"> </span>|
|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|
|<span class="hljs-string"> </span>|<span class="hljs-string"> +------------------------+
v v
+-------+---+ +--+-------+
</span>|<span class="hljs-string"> browser </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|
|<span class="hljs-string"> X client </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> xterm </span>|
|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|
+-----------+ +----------+
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4">
<h1>x11 - displays and screens</h1>
<ul>
<li>
<p>You &quot;select&quot; a display with the <code>:$DISPLAY:SCREEN</code> syntax.</p>
</li>
<li>
<p>So the first screen on your main display server would be :0.0</p>
</li>
<li>
<p>You can set the display an application launches with DISPLAY environment variable</p>
</li>
</ul>
<p><code>export DISPLAY=:0.1 leafpad</code></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5">
<h1>Xvfb</h1>
<blockquote>
<p>Xvfb or X virtual framebuffer is a display server implementing the X11 display server protocol. In contrast to other display servers, Xvfb performs all graphical operations in virtual memory without showing any screen output.</p>
</blockquote>
<blockquote>
<p>However, no output is shown. This virtual server does not require the computer it is running on to have any kind of graphics adapter, a screen or any input device.</p>
</blockquote>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6">
<h1><code>xwd</code></h1>
<blockquote>
<p>xwd - dump an image of an X window</p>
</blockquote>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>xwd -root <span class="hljs-built_in">image</span>.xwd
<span class="hljs-built_in">convert</span> <span class="hljs-built_in">image</span>.xwd <span class="hljs-built_in">image</span>.png
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7">
<h1><code>ffmpeg</code></h1>
<p>can &quot;grab&quot; X11 windows</p>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>ffmpeg -f x11grab -framerate <span class="hljs-number">10</span> -<span class="hljs-string">i :</span><span class="hljs-number">1.0</span> \
-vaapi_device <span class="hljs-regexp">/dev/</span>dri/renderD128 \
-vf <span class="hljs-string">'format=nv12,hwupload,scale_vaapi=w=854:h=480'</span> \
-<span class="hljs-string">c:</span>v h264_vaapi -<span class="hljs-string">qp:</span>v <span class="hljs-number">26</span> -bf <span class="hljs-number">0</span> -tune zerolatency -f mpegts \
<span class="hljs-symbol"> udp:</span><span class="hljs-comment">//localhost:12345</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8">
<h1>video devices</h1>
<ul>
<li><code>/dev/video*</code></li>
</ul>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">v4l2-ctl</span> <span class="hljs-string">--device /dev/video2 --all</span>
<span class="hljs-attr">Driver</span> <span class="hljs-string">Info:</span>
<span class="hljs-attr">Driver</span> <span class="hljs-string">name : uvcvideo</span>
<span class="hljs-attr">Card</span> <span class="hljs-string">type : HD Pro Webcam C920</span>
<span class="hljs-attr">Bus</span> <span class="hljs-string">info : usb-0000:00:14.0-4</span>
<span class="hljs-attr">Driver</span> <span class="hljs-string">version : 5.7.9</span>
<span class="hljs-attr">Capabilities</span> : <span class="hljs-string">0x84a00001</span>
<span class="hljs-attr">Video</span> <span class="hljs-string">Capture</span>
<span class="hljs-attr">Metadata</span> <span class="hljs-string">Capture</span>
<span class="hljs-attr">Streaming</span>
<span class="hljs-attr">Extended</span> <span class="hljs-string">Pix Format</span>
<span class="hljs-attr">Device</span> <span class="hljs-string">Capabilities</span>
<span class="hljs-attr">Device</span> <span class="hljs-string">Caps : 0x04a00000</span>
<span class="hljs-attr">Metadata</span> <span class="hljs-string">Capture</span>
<span class="hljs-attr">Streaming</span>
<span class="hljs-attr">Extended</span> <span class="hljs-string">Pix Format</span>
<span class="hljs-attr">Priority</span>: <span class="hljs-string">2</span>
<span class="hljs-attr">Format</span> <span class="hljs-string">Metadata Capture:</span>
<span class="hljs-attr">Sample</span> <span class="hljs-string">Format : 'UVCH' (UVC Payload Header Metadata)</span>
<span class="hljs-attr">Buffer</span> <span class="hljs-string">Size : 1024</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9">
<h1>v4l2loopback</h1>
<blockquote>
<p>v4l2loopback - a kernel module to create V4L2 loopback devices</p>
</blockquote>
<blockquote>
<p>this module allows you to create &quot;virtual video devices&quot; normal (v4l2) applications will read these devices as if they were ordinary video devices, but the video will not be read from e.g. a capture card but instead it is generated by another application. this allows you for instance to apply some nifty video effects on your Skype video... it also allows some more serious things (e.g. I've been using it to add streaming capabilities to an application by the means of hooking GStreamer into the loopback devices).</p>
</blockquote>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10">
<h1>create new webcams!</h1>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>modprobe v4l2loopback <span class="hljs-attribute">devices</span>=4
</span></span></foreignObject></svg></code></pre>
<p><code>/dev/video3,4,5,6,7</code></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11">
<h1>ffmpeg can &quot;write&quot; to v4l</h1>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-attr">ffmpeg</span> <span class="hljs-string">-f x11grab \
-framerate 4 \
-s 854x480 \
-i :1.0 \
-pix_fmt yuv420p \
-f v4l2 /dev/video3</span>
</span></span></foreignObject></svg></code></pre>
<p><code>ffmpeg -pix_fmts</code></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12">
<h1>aside: MJPEG over HTTP</h1>
<p><code>ffmpeg -i ... -f mjpg -o file.jpg</code></p>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-attribute">Content-Type</span>: multipart/x-mixed-replace; boundary="JPGBoundary"
<span class="livecodeserver"><span class="hljs-comment">--JPGBoundary</span>
Content-Type: image/jpeg
&lt;jpeg <span class="hljs-keyword">bytes</span>&gt;
<span class="hljs-comment">--JPGBoundary</span>
Content-Type: image/jpeg
&lt;jpeg <span class="hljs-keyword">bytes</span>&gt;
<span class="hljs-comment">--JPGBoundary</span>
... <span class="hljs-keyword">and</span> so <span class="hljs-keyword">on</span> ...
<span class="hljs-comment">--JPGBoundary--</span>
</span></span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13">
<h1>MJPEG streaming is simple</h1>
<ul>
<li><code>mjpeg-server</code> (uses <code>ffmpeg -f mjpg</code>)</li>
<li><code>ustreamer</code> (only supports <code>/dev/video*</code>)</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14">
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>+---------------------+ +---------------------------+
|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|
|<span class="hljs-string"> Xvfb Virtual +------&gt; </span>|<span class="hljs-string"> ffmpeg -f x11grab </span>|
+---------+-----------+ |<span class="hljs-string"> -o /de^/video3 </span>|
^ +---------------------------+
+------+----------+ |<span class="hljs-string">
</span>|<span class="hljs-string"> X Server +&lt;---+ +---------+-----------+
+---+-------------+ </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> /dev/video3 </span>|
^ |<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|<span class="hljs-string">-???-&gt;USTREAMER-&gt;Viewers ???
+---+---+ </span>|<span class="hljs-string"> +-------+-------------+
</span>|<span class="hljs-string"> baba </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|
|<span class="hljs-string"> is </span>|<span class="hljs-string"> +-----+---------+ </span>|<span class="hljs-string"> +-----------+
</span>|<span class="hljs-string"> you </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> +--&gt;+ Zoom </span>|
|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> xdotool </span>|<span class="hljs-string"> </span>|<span class="hljs-string"> </span>|
+-------+ +---------------+ +-----------+
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15">
<h1>security</h1>
<p>YOLO!</p>
<p>Pitch: RFCs We Love!</p>
</section>
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