title: Concatenate DASH audio and video to single file
body: <p>First of all, I have a folder with about 200 video and audio segments (m4v and m4a) of a video that was live streamed as DASH video. Now - without having the original file - I want to concatenate those parts to a single, playable video file.</p>
  
  <p>To mention what I already tested:</p>
  
  <ul>
  <li>concatenate via the Unix terminal command cat; unfortunately this won't help to make the video playable in any media player again</li>
  <li>using ffmpeg's merge abilities via files.txt; with the same unsuccessful result</li>
  </ul>
  
  <p>I'm definitely not an expert (otherwise I probably wouldn't ask) but the problem may be also the missing mpd and/or init file (as far as I could skim in the standard).</p>
  
  <p>Don't get me wrong: I <strong>don't</strong> want to get a bit to bit identical result of the original file. All I want to achieve is a single playable mp4 file of aforesaid video.</p>
  
  <p>I also tried to make a own mpd file, but the "stream" won't play. FYI, I tried playing it in the current VLC 3.0.0 git, since the current stable versions seems not to support DASH.
  If it helps, here the video codec:</p>
  
  <pre><code>id="live-hd_H264"
  mimeType="video/mp4"
  codecs="avc1.4d401f"
  width="396"
  height="704"
  </code></pre>
  
  <p>So, can anybody help me?</p>
  
  <p>Kind regards!</p>