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<li class="nav-item nav-item-this"><a href="">UDP file options</a></li>
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<section id="udp-file-options">
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<h1>UDP file options<a class="headerlink" href="#udp-file-options" title="Permalink to this headline">¶</a></h1>
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<p>UDP file is of the form:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>udp://<ip>:<port>[?<option>[&<option>]...]
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</pre></div>
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</div>
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<p>Here is the list of supported options:</p>
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<dl class="field-list simple">
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<dt class="field-odd">buffer_size=<size_in_bytes></dt>
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<dd class="field-odd"><p>UDP maximum receive buffer size in bytes. Note that although it can be set
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to any value, the actual value is capped by maximum allowed size defined by
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the underlying operating system. On linux, the maximum size allowed can be
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retrieved using <cite>sysctl net.core.rmem_max</cite> and configured using
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<cite>sysctl -w net.core.rmem_max=<size_in_bytes></cite>.</p>
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</dd>
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<dt class="field-even">interface=<addr></dt>
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<dd class="field-even"><p>Multicast group interface address. Only the packets sent to this address are
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received. Default to “0.0.0.0” if not specified.</p>
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</dd>
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<dt class="field-odd">reuse=0|1</dt>
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<dd class="field-odd"><p>Allow or disallow reusing UDP sockets.</p>
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</dd>
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<dt class="field-even">source=<addr></dt>
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<dd class="field-even"><p>Multicast source ip address. Only the packets sent from this source address
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are received. Enables Source Specific Multicast (SSM) if set.</p>
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</dd>
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<dt class="field-odd">timeout=<microseconds></dt>
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<dd class="field-odd"><p>UDP timeout in microseconds.</p>
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</dd>
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</dl>
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<p>Example:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>udp://224.1.2.30:88?interface=10.11.12.13&reuse=1
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</pre></div>
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</div>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>UDP is by definition unreliable. There could be packets dropped.</p>
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<p>UDP packets do not get lost magically. There are things you can do to
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minimize the packet loss. A common cause of packet loss is buffer overrun,
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either in send buffer or receive buffer.</p>
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<p>On Linux, you can check UDP errors by monitoring the output from
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<cite>netstat -suna</cite> command.</p>
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<p>If there is an increase in <cite>send buffer errors</cite> from the <cite>netstat</cite> output,
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then try increasing <cite>buffer_size</cite> in
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[FFmpeg](<a class="reference external" href="https://ffmpeg.org/ffmpeg-protocols.html#udp">https://ffmpeg.org/ffmpeg-protocols.html#udp</a>).</p>
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<p>If there is an increase in <cite>receive buffer errors</cite>, then try increasing
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<cite>buffer_size</cite> in UDP options (See above) or increasing <cite>–io_cache_size</cite>.
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<cite>buffer_size</cite> in UDP options defines the UDP buffer size of the underlying
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system while <cite>io_cache_size</cite> defines the size of the internal circular
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buffer managed by <cite>Shaka Packager</cite>.</p>
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