title: Is it possible to split frame accurate an AAC file using FFmpeg?
body: <p>What I did:</p>
  
  <pre><code># create source material
  ffmpeg -y -i some.file -c:a libfdk_aac -profile:a aac_he -b:a 128k -ar 44100 source.m4a
  
  # split into two parts 
  ffmpeg -y -ss 00:00:00 -i source.m4a -to 6 -c copy part1.m4a
  ffmpeg -y -ss 00:00:06 -i source.m4a -c copy part2.m4a
  
  # re-encode only the first part with the same setting as source file
  fmpeg -y -i part1.m4a -c:a libfdk_aac -profile:a aac_he -b:a 128k -ar 44100 part1reencoded.m4a
  
  # create file list to be concatenated
  echo 'ffconcat version 1.0
  file part1reencoded.m4a
  file part2.m4a' &gt; my.list
  
  # finally concatenate both parts
  ffmpeg -y -f concat -safe 0 -i my.list -c copy parts.m4a
  
  # play the result
  ffplay parts.m4a
  </code></pre>
  
  <p>Unfortunately, the result file has noises at <code>00:00:06</code>.</p>
  
  <p>Is it possible to split frame accurate an AAC file using FFmpeg?</p>