All output audio tracks marked as 'default' when including multiple input audio selectors

Question

I'm trying to create video files with audio tracks for multiple languages. My input is a video file with an English track, then separate audio files for each additional language. I followed [this AWS blog post](https://aws.amazon.com/blogs/media/processing-multilingual-track-content-using-aws-elemental-mediaconvert/) with instructions on how to do this, but the output created when I follow the instructions has every audio stream marked as 'default'. When I play the file on iOS, all audio tracks play simultaneously.

When I use ffmpeg to change the dispositions of the audio tracks (I changed all the non-english tracks from 'default' to 'dub') this works correctly.

How can I get MediaConvert to produce an output with properly annotated audio tracks?

This is the ffprobe output for my output file from MediaConvert:
```
  Metadata:
    major_brand     : M4V
    minor_version   : 1
    compatible_brands: isomavc1mp42
    creation_time   : 2024-04-11T20:10:07.000000Z
  Duration: 00:05:34.71, start: 0.000000, bitrate: 5642 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 5243 kb/s, 24 fps, 24 tbr, 24k tbn (default)
    Metadata:
      creation_time   : 2024-04-11T20:10:07.000000Z
      handler_name    : ETI ISO Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : Elemental H.264
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 2024-04-11T20:10:07.000000Z
      handler_name    : ETI ISO Audio Media Handler
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](fra): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 2024-04-11T20:10:07.000000Z
      handler_name    : ETI ISO Audio Media Handler
      vendor_id       : [0][0][0][0]
  Stream #0:3[0x4](ger): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 2024-04-11T20:10:07.000000Z
      handler_name    : ETI ISO Audio Media Handler
      vendor_id       : [0][0][0][0]
  Stream #0:4[0x5](spa): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 2024-04-11T20:10:07.000000Z
      handler_name    : ETI ISO Audio Media Handler
      vendor_id       : [0][0][0][0]
```

Answer

Under the Advanced dropdown in your audio output encoding settings change your Audio type control from "Follow input" to "Use configured" the set the Audio type accordingly (The following are defined in ISO-IEC 13818-1: 0 = Undefined, 1 = Clean Effects, 2 = Hearing Impaired, 3 = Visually Impaired Commentary, 4-255 = Reserved.).
Your output audios are marked as (default) because you are using  the Audio type control to Follow input

Answer

Hello,

From your note, I understand the output created has every audio stream marked as 'default'. You need to know how you can get MediaConvert to produce an output with properly annotated audio tracks.

You can follow the below steps to produce properly annotated audio tracks :

(i) Insert Language code–embedded audio tracks in the Input

(ii) Add them as **Audio selectors** in the Job input, specifying the *Selector type* as *Language code*.
![Enter image description here](/media/postImages/original/IMHT8sZytxS6GlPIQhsZ8CxA)

(iii) Reference the created Audio Selectors in the corresponding **Output settings** > **Encoding settings** .
![Enter image description here](/media/postImages/original/IM9tamepGBSN6eePM_f2b_tg)

All output audio tracks marked as 'default' when including multiple input audio selectors

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