title: Convert YouTube M4a DASH to regular M4a with Hex Editor
body: <p>Using various browser extensions allows download of YouTube content as audio M4a format.</p>
  
  <p>However, according to this post</p>
  
  <p><a href="https://superuser.com/questions/837067/convert-youtube-dash-audio-youtube-dl-to-m4a-aac-dl/837076#837076">https://superuser.com/questions/837067/convert-youtube-dash-audio-youtube-dl-to-m4a-aac-dl/837076#837076</a></p>
  
  <p>the M4a codec is DASH, which is not widely recognized / built-in (yet) to players such as VLC.</p>
  
  <p>Reading into the meaning of <code>container</code>, the above post seems to suggest that if one could change bytes 8 to 11 from DASH to MP4 then the file would immediately be playable..?</p>
  
  <p>I tried this with a hex editor, but the file was not rendered playable in VLC.</p>
  
  <p>Am I missing something basic (for example, deleting byte 11 - I made it 00?), or is there a lot more to it?</p>
  
  <p>PS - I was able to convert the file using Foobar2000 1.37beta and the MP3 convert ability, but a hex editor would be faster for my purposes.</p>