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      <base href="https://bugzilla.libav.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - concat: `Protocol not found`"
   href="https://bugzilla.libav.org/show_bug.cgi?id=1092">1092</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>concat: `Protocol not found`
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Libav
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>12
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>X86
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>---
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>utilities
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>bugzilla@libav.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>zdanevich.vitaly@ya.ru
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Error when trying to concat few ogg audio files:
`avconv -i concat:"in1.ogg|in2.ogg" -c copy out.m4a`

Also I tried the command without "

On my build and static builds from <a href="https://johnvansickle.com/libav">https://johnvansickle.com/libav</a>:
`avconv -protocols`
among others returns `concat`.

OS: Amazon Linux</pre>
        </div>
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