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                <ol class="chapter"><li class="chapter-item expanded affix "><a href="../intro.html">Introduction</a></li><li class="chapter-item expanded "><a href="../tools/index.html"><strong aria-hidden="true">1.</strong> Tools</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../tools/zsh.html"><strong aria-hidden="true">1.1.</strong> zsh</a></li><li class="chapter-item expanded "><a href="../tools/bash.html"><strong aria-hidden="true">1.2.</strong> bash</a></li><li class="chapter-item expanded "><a href="../tools/fish.html"><strong aria-hidden="true">1.3.</strong> fish</a></li><li class="chapter-item expanded "><a href="../tools/tmux.html"><strong aria-hidden="true">1.4.</strong> tmux</a></li><li class="chapter-item expanded "><a href="../tools/git.html"><strong aria-hidden="true">1.5.</strong> git</a></li><li class="chapter-item expanded "><a href="../tools/awk.html"><strong aria-hidden="true">1.6.</strong> awk</a></li><li class="chapter-item expanded 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strace</a></li><li class="chapter-item expanded "><a href="../trace_profile/ltrace.html"><strong aria-hidden="true">3.3.</strong> ltrace</a></li><li class="chapter-item expanded "><a href="../trace_profile/perf.html"><strong aria-hidden="true">3.4.</strong> perf</a></li><li class="chapter-item expanded "><a href="../trace_profile/oprofile.html"><strong aria-hidden="true">3.5.</strong> OProfile</a></li><li class="chapter-item expanded "><a href="../trace_profile/callgrind.html"><strong aria-hidden="true">3.6.</strong> callgrind</a></li></ol></li><li class="chapter-item expanded "><a href="../binary/index.html"><strong aria-hidden="true">4.</strong> Binary</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../binary/od.html"><strong aria-hidden="true">4.1.</strong> od</a></li><li class="chapter-item expanded "><a href="../binary/xxd.html"><strong aria-hidden="true">4.2.</strong> xxd</a></li><li class="chapter-item expanded "><a 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                        <h1 id="ffmpeg-1"><a class="header" href="#ffmpeg-1">ffmpeg (1)</a></h1>
<h2 id="screen-capture-specific-window-x11"><a class="header" href="#screen-capture-specific-window-x11">screen capture specific window (x11)</a></h2>
<p>Following snippet allows to select a window which is then captured.</p>
<pre><code class="language-bash">#!/bin/bash

echo "Click on window to record .."
# Extract window size and x,y offset.
video_args=$(xwininfo \
    | awk '/Absolute upper-left X:/ { xoff = $4 }
           /Absolute upper-left Y:/ { yoff=$4 }
           /Width:/ { if ($2 % 2 == 1) { width=$2-1; } else { width=$2; } }
           /Height:/ { if ($2 % 2 == 1) { height=$2-1; } else { height=$2; } }
           END { printf "-video_size %dx%d -i :0.0+%d,%d", width, height, xoff, yoff  }')

ffmpeg -framerate 25 -f x11grab $video_args -pix_fmt yuv420p $@ output.mp4
</code></pre>
<blockquote>
<p>Use <code>yuv420p</code> pixel format if video is played on the web
(<a href="https://stackoverflow.com/questions/32829514/which-pixel-format-for-web-mp4-video">ref</a>)</p>
</blockquote>
<p>The input <code>-i 0,0+xoff,yoff</code> means to capture <code>$DISPLAY=0.0</code> starting at the
coordinate <code>(xoff, yoff)</code>, which is the left-upper corner, and the size of the
capture is defined by the <code>-video_size</code> argument.</p>

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