Answers.Body: <p>Some media players simply start playing the first audio stream (track). For them you may simply change the order of audio streams.</p>
  
  <p>For example, suppose you have 1 video stream and 3 audio streams in your input file, and you want to move the 3rd audio stream to be the first of audio streams.</p>
  
  <p>Use</p>
  
  <pre><code>ffmpeg -i input.mp4 -map 0:v -map 0:a:2 -map 0:a:0 -map 0:a:1 -c copy output.mp4 
  </code></pre>
  
  <p>so <code>-map 0:a:2</code> places the 3rd audio stream (stream numbers begin with <code>0</code>, so <code>2</code> is the 3rd one) in front of all others audio streams (<code>-map 0:a:0 -map 0:a:1</code>).  </p>
  
  <hr>
  
  <p><em>Note:</em></p>
  
  <ul>
  <li><code>0:v</code> means <em>all</em> <strong>v</strong>ideo streams in the input file <code>0</code> (input files are numbered from <code>0</code>)</li>
  <li><code>0:a:2</code> means: input file <code>0</code>, <strong>a</strong>udio stream number <code>2</code></li>
  <li><code>0:a:0</code> means: input file <code>0</code>, <strong>a</strong>udio stream number <code>0</code></li>
  <li><code>0:a:1</code> means: input file <code>0</code>, <strong>a</strong>udio stream number <code>1</code></li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-08T17:05:16.610Z
Answers.Text: Thank you for your explanation!
Answers.UserDisplayName: Артур Гудиев
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-08T16:36:45.613Z
Answers.LastActivityDate: 2020-01-08T16:46:06.427Z
Answers.LastEditDate: 2020-01-08T16:46:06.427Z
Answers.UserDisplayName: MarianD
Answers.Body: <p>I found the following solution in Avidemux. (prveious answers are not always working)</p>
  <ol>
  <li>Open video in Avidemux</li>
  <li>In "Audio -> Select track" choose only one track you need</li>
  <li>In "output format" select "mp4 muxer"</li>
  <li>Save the file using "File -> Save as"</li>
  </ol>
  <p>There is also a disadvantage in this method. It removes all other tracks but it's good enough for some cases.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-11-05T09:41:27.400Z
Answers.LastActivityDate: 2020-11-05T09:41:27.400Z
Answers.UserDisplayName: Артур Гудиев
Answers.Body: <p>Use <a href="https://ffmpeg.org/" rel="nofollow noreferrer">FFmpeg</a>:</p>
  
  <pre><code>ffmpeg -i input.mp4 -map 0 -c copy -disposition:a:0 0 -disposition:a:1 default output.mp4
  </code></pre>
  
  <p>Audio tracks (streams) are numbered from <code>0</code>. </p>
  
  <p>Supposing the input video has 2 audio streams, and the default audio stream is <code>0</code>, we need to </p>
  
  <ul>
  <li><em>remove</em> the “default” disposition from it (by setting it to 0: <code>-disposition:a:0 0</code>) and  </li>
  <li><em>set it</em> to the audio stream <code>1</code> (by setting it to “default”: <code>-disposition:a:1 default</code>).</li>
  </ul>
  
  <p>In general, <em>remove</em> the “default” disposition from all audio streams except one, and <em>set it</em> for it.</p>
  
  <hr>
  
  <p><em>Note:</em></p>
  
  <p>Not all media players honor default audio stream — for example Media Player Classic don't honor it (but you may set the preference by the language of audio streams), while VLC Media Player and FFplay do.</p>
  
  <hr>
  
  <p><em>Proof (note the location of the “(default)” tag):</em></p>
  
  <pre><code>ffprobe -hide_banner input.mp4
  </code></pre>
  
  <p>gives (among others)</p>
  
  <pre><code>Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s (default)
  Metadata:
    handler_name    : SoundHandler
  Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 74 kb/s
  Metadata:
    handler_name    : SoundHandler
  </code></pre>
  
  <p>while</p>
  
  <pre><code>ffprobe -hide_banner output.mp4
  </code></pre>
  
  <p>gives</p>
  
  <pre><code>Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s
  Metadata:
    handler_name    : SoundHandler
  Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 74 kb/s (default)
  Metadata:
    handler_name    : SoundHandler
  </code></pre>
  
  <p>The numbering here numbers <em>all</em> tracks, so <code>#0:0</code> (omitted from the FFprobe outputs) is the first (video) track, and <code>#0:1</code> and <code>#0:2</code> are audio tracks.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-08T07:48:43.157Z
Answers.Text: I tried it with different variants (from 1 to 4) but it does't work for me. Unfortunately. Default audio track stays the same.
Answers.UserDisplayName: Артур Гудиев
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-08T15:16:37.480Z
Answers.Text: I edited my answer — you also need to remove the “default” disposition from all other audio tracks.
Answers.UserDisplayName: MarianD
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-08T15:36:10.013Z
Answers.Text: Note that not all media players honor the “default” disposition — some of them simply start playing the first audio stream.
Answers.UserDisplayName: MarianD
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-08T16:57:23.937Z
Answers.Text: Thank you so much! I use VLC player. And the edited answer helped me!
Answers.UserDisplayName: Артур Гудиев
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-04-07T12:45:53.600Z
Answers.Text: combining this (changing default) and MarianD's answer (changing order) works great...now it'll probably work on any player
Answers.UserDisplayName: Peter
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-07T22:35:17.010Z
Answers.LastActivityDate: 2020-01-08T16:08:31.160Z
Answers.LastEditDate: 2020-01-08T16:08:31.160Z
Answers.UserDisplayName: MarianD
Body: <p>I often download mp4 videos with multiple audio tracks. 
  Is it any way or some tools with explanation to change default audio track ?</p>
  
Tags: <audio>
Title: Change default audio track in mp4 video
UserDisplayName: Артур Гудиев
ThreadText: # Change default audio track in mp4 video
  
  (Asked by: username_0 on 2020-01-07)
  
  I often download mp4 videos with multiple audio tracks.
  Is it any way or some tools with explanation to change default audio track ?
  
  **Tags:** audio
  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_1 on 2020-01-07. Score: 3 | Accepted answer
  
  Use [FFmpeg](https://ffmpeg.org/):
  
  ```
  ffmpeg -i input.mp4 -map 0 -c copy -disposition:a:0 0 -disposition:a:1 default output.mp4
  
  ```
  
  Audio tracks (streams) are numbered from `0`.
  
  Supposing the input video has 2 audio streams, and the default audio stream is `0`, we need to
  
  * *remove* the “default” disposition from it (by setting it to 0: `-disposition:a:0 0`) and
  * *set it* to the audio stream `1` (by setting it to “default”: `-disposition:a:1 default`).
  
  In general, *remove* the “default” disposition from all audio streams except one, and *set it* for it.
  
  ---
  
  *Note:*
  
  Not all media players honor default audio stream — for example Media Player Classic don't honor it (but you may set the preference by the language of audio streams), while VLC Media Player and FFplay do.
  
  ---
  
  *Proof (note the location of the “(default)” tag):*
  
  ```
  ffprobe -hide_banner input.mp4
  
  ```
  
  gives (among others)
  
  ```
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s (default)
  Metadata:
    handler_name    : SoundHandler
  Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 74 kb/s
  Metadata:
    handler_name    : SoundHandler
  
  ```
  
  while
  
  ```
  ffprobe -hide_banner output.mp4
  
  ```
  
  gives
  
  ```
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s
  Metadata:
    handler_name    : SoundHandler
  Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 74 kb/s (default)
  Metadata:
    handler_name    : SoundHandler
  
  ```
  
  The numbering here numbers *all* tracks, so `#0:0` (omitted from the FFprobe outputs) is the first (video) track, and `#0:1` and `#0:2` are audio tracks.
  
  > **Comments:**
  > **username_0**: I tried it with different variants (from 1 to 4) but it does't work for me. Unfortunately. Default audio track stays the same.  
  > **username_1**: I edited my answer — you also need to remove the “default” disposition from all other audio tracks.  
  > **username_1**: Note that not all media players honor the “default” disposition — some of them simply start playing the first audio stream.  
  > **username_0**: Thank you so much! I use VLC player. And the edited answer helped me!  
  > **username_2**: combining this (changing default) and username_1's answer (changing order) works great...now it'll probably work on any player  
  
  ---
  
  ### Answer by username_1 on 2020-01-08. Score: 2
  
  Some media players simply start playing the first audio stream (track). For them you may simply change the order of audio streams.
  
  For example, suppose you have 1 video stream and 3 audio streams in your input file, and you want to move the 3rd audio stream to be the first of audio streams.
  
  Use
  
  ```
  ffmpeg -i input.mp4 -map 0:v -map 0:a:2 -map 0:a:0 -map 0:a:1 -c copy output.mp4 
  
  ```
  
  so `-map 0:a:2` places the 3rd audio stream (stream numbers begin with `0`, so `2` is the 3rd one) in front of all others audio streams (`-map 0:a:0 -map 0:a:1`).
  
  ---
  
  *Note:*
  
  * `0:v` means *all* **v**ideo streams in the input file `0` (input files are numbered from `0`)
  * `0:a:2` means: input file `0`, **a**udio stream number `2`
  * `0:a:0` means: input file `0`, **a**udio stream number `0`
  * `0:a:1` means: input file `0`, **a**udio stream number `1`
  
  > **Comments:**
  > **username_0**: Thank you for your explanation!  
  
  ---
  
  ### Answer by username_0 on 2020-11-05. Score: 0
  
  I found the following solution in Avidemux. (prveious answers are not always working)
  
  1. Open video in Avidemux
  2. In "Audio -> Select track" choose only one track you need
  3. In "output format" select "mp4 muxer"
  4. Save the file using "File -> Save as"
  
  There is also a disadvantage in this method. It removes all other tracks but it's good enough for some cases.
  
  
  ---
  
  