Answers.Body: <p>If you run <code>ffmpeg -layouts</code>, you will see that stereo indicates the presence of two channels, one assigned as Front Left and the other as Front Right. If you use <code>-ac 2</code> in your encode, ffmpeg will create a stereo layout output by default. FFmpeg does not display the individual channel assignments in the readout of the file.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-12-12T19:52:32.473Z
Answers.LastActivityDate: 2016-12-12T19:52:32.473Z
Answers.UserDisplayName: Gyan
Body: <p>I have an unusual problem that I hope someone can help me solve.
  I have 45 video files that I'm batch encoding as MP4.
  Some of those files have their audio channel position set to Front L R and others have have it set to Front C.
  However, the distribution system which these videos are sent to (and which I have no control over) does some re-processing of these videos.
  All the videos that have their Channel Position set to Front C are coming back with distorted audio. </p>
  
  <p>My question is:</p>
  
  <p>Does anyone know how to encode a video with ffmpeg and force the audio channel positions to be Front L R?
  (I have carefully studied this page (<a href="https://trac.ffmpeg.org/wiki/AudioChannelManipulation#monostereo" rel="nofollow noreferrer">https://trac.ffmpeg.org/wiki/AudioChannelManipulation#monostereo</a>) but it was not obvious what the solution might be)</p>
  
  <p>Thank you!</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-12-12T18:54:18.533Z
Comments.Text: The encoder will set stereo layout when you encode with `-ac 2` as shown in the wiki you linked to.
Comments.UserDisplayName: Gyan
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-12-12T19:40:32.303Z
Comments.Text: @Mulvya Thank you, I tried your suggestion. After encoding ffmpeg reported the following for the audio information: "Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)" It's not clear to me how to read this. Does LC mean "Left Channel"?
Comments.UserDisplayName: d13
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-12-12T19:49:28.013Z
Comments.Text: No. LC means Low Complexity and refers to the audio bitstream profile.
Comments.UserDisplayName: Gyan
Tags: <ffmpeg><audio><encoding>
Title: Mono to Stereo using FFMPEG
UserDisplayName: d13
ThreadText: # Mono to Stereo using FFMPEG
  
  (Asked by: username_0 on 2016-12-12)
  
  I have an unusual problem that I hope someone can help me solve.
  I have 45 video files that I'm batch encoding as MP4.
  Some of those files have their audio channel position set to Front L R and others have have it set to Front C.
  However, the distribution system which these videos are sent to (and which I have no control over) does some re-processing of these videos.
  All the videos that have their Channel Position set to Front C are coming back with distorted audio.
  
  My question is:
  
  Does anyone know how to encode a video with ffmpeg and force the audio channel positions to be Front L R?
  (I have carefully studied this page (<https://trac.ffmpeg.org/wiki/AudioChannelManipulation#monostereo>) but it was not obvious what the solution might be)
  
  Thank you!
  
  **Tags:** ffmpeg, audio, encoding
  
  > **Comments:**
  > **username_1**: The encoder will set stereo layout when you encode with `-ac 2` as shown in the wiki you linked to.  
  > **username_0**: @Mulvya Thank you, I tried your suggestion. After encoding ffmpeg reported the following for the audio information: "Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)" It's not clear to me how to read this. Does LC mean "Left Channel"?  
  > **username_1**: No. LC means Low Complexity and refers to the audio bitstream profile.  
  
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  ## 1 answers
  
  ### Answer by username_1 on 2016-12-12. Score: 7 | Accepted answer
  
  If you run `ffmpeg -layouts`, you will see that stereo indicates the presence of two channels, one assigned as Front Left and the other as Front Right. If you use `-ac 2` in your encode, ffmpeg will create a stereo layout output by default. FFmpeg does not display the individual channel assignments in the readout of the file.
  
  
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