Answers.Body: <p>In case anyone ever needs it, this worked out for me, the combination of split filter and map.</p>
  <pre><code>-filter_complex &quot;[0:1]asplit=4[1:1][1:3][1:5][1:7];[0:2]asplit=4[2:2][2:4][2:6][2:8]&quot;
  
  -map 0:v:0 -map &quot;[1:1]&quot; -map &quot;[2:2]&quot; -map &quot;[1:3]&quot; -map &quot;[2:4]&quot; -map &quot;[1:5]&quot; -map &quot;[2:6]&quot; -map &quot;[1:7]&quot; -map &quot;[2:8]&quot;
  </code></pre>
  <p>The whole command:</p>
  <pre><code>ffmpeg -y -i &lt;input_2_tracks&gt;.mxf -filter_complex \
  &quot;[0:1]asplit=4[1:1][1:3][1:5][1:7];[0:2]asplit=4[2:2][2:4][2:6][2:8]&quot; \
  -map 0:v:0 -map &quot;[1:1]&quot; -map &quot;[2:2]&quot; -map &quot;[1:3]&quot; -map &quot;[2:4]&quot; -map &quot;[1:5]&quot; \
  -map &quot;[2:6]&quot; -map &quot;[1:7]&quot; -map &quot;[2:8]&quot; \
  -c:v copy -c:a pcm_s24le -ar 48000 &lt;output_8_tracks&gt;.mxf
  </code></pre>
  <p>This will take input with any number of tracks and copy the first two tracks into the eight tracks in the output file. The <code>asplit</code> arguments <code>[1:1][1:3]</code> etc. may be named arbitrarily.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-07-05T14:30:00.563Z
Answers.LastActivityDate: 2023-09-24T16:35:34.243Z
Answers.LastEditDate: 2023-09-24T16:35:34.243Z
Answers.UserDisplayName: igor
Body: <p>I have a 2 audio track mxf file and need to clone the video but create 8 audio tracks. The tracks 1 and 2 should be copied into 3 and 4, 5 and 6 and 7 and 8. Some files that I'm dealing with are 4 track files with the silence in 3 and 4, and some are genuine 2 track mxf's with a mono audio in each one. Not wearing my ffmpeg boots for quite some time, any ideas how to achieve this? Thanks!</p>
  
Tags: <ffmpeg><audio>
Title: ffmpeg - Copy the first 2 tracks of audio to new 6 tracks so all 8 tracks contains audio from the first 2
UserDisplayName: igor
ThreadText: # ffmpeg - Copy the first 2 tracks of audio to new 6 tracks so all 8 tracks contains audio from the first 2
  
  (Asked by: username_0 on 2023-07-03)
  
  I have a 2 audio track mxf file and need to clone the video but create 8 audio tracks. The tracks 1 and 2 should be copied into 3 and 4, 5 and 6 and 7 and 8. Some files that I'm dealing with are 4 track files with the silence in 3 and 4, and some are genuine 2 track mxf's with a mono audio in each one. Not wearing my ffmpeg boots for quite some time, any ideas how to achieve this? Thanks!
  
  **Tags:** ffmpeg, audio
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_0 on 2023-07-05. Score: 0 | Accepted answer
  
  In case anyone ever needs it, this worked out for me, the combination of split filter and map.
  
  ```
  -filter_complex "[0:1]asplit=4[1:1][1:3][1:5][1:7];[0:2]asplit=4[2:2][2:4][2:6][2:8]"
  
  -map 0:v:0 -map "[1:1]" -map "[2:2]" -map "[1:3]" -map "[2:4]" -map "[1:5]" -map "[2:6]" -map "[1:7]" -map "[2:8]"
  
  ```
  
  The whole command:
  
  ```
  ffmpeg -y -i <input_2_tracks>.mxf -filter_complex \
  "[0:1]asplit=4[1:1][1:3][1:5][1:7];[0:2]asplit=4[2:2][2:4][2:6][2:8]" \
  -map 0:v:0 -map "[1:1]" -map "[2:2]" -map "[1:3]" -map "[2:4]" -map "[1:5]" \
  -map "[2:6]" -map "[1:7]" -map "[2:8]" \
  -c:v copy -c:a pcm_s24le -ar 48000 <output_8_tracks>.mxf
  
  ```
  
  This will take input with any number of tracks and copy the first two tracks into the eight tracks in the output file. The `asplit` arguments `[1:1][1:3]` etc. may be named arbitrarily.
  
  
  ---
  
  