Can MediaConvert mix a background audio file with the main audio

Question

We have used other encoding services where this feature was available
With the main input file let say myVideo.mp4 we provided a background track and the transcoding would mix both in the resulting audio.m3u8
Is this possible with MediaConvert ? Can't find anything on this.
Right now we are premixing with ffmpeg before sending to MediaConvert
Would be neat to avoid this lambda step

Thanks
Mat

Answer

So if I add 2 audio selectors (one AAC from mp4 and one mp3 from external file) and use an audio selector group to combine them I get this error

Error message
Failed to start pipeline [Audio selector groups cannot combine audio sources that have different codecs.]

Error code
1040

Is it something possible or should I handle this with ffmpeg pre processing

Answer

You can combine multiple audio inputs, from Tracks, PID or sidecar files, into an Audio Selector. See here for some details.
https://docs.aws.amazon.com/mediaconvert/latest/ug/more-about-audio-tracks-selectors.html

Once you have the Audio Selectors defined, on each audio output select the Advanced dropdown in the AWS MediaConvert console, then enable Manual Audio Remixing. There you can create a mix table of the audio from the separate channel included in the Audio Selector. Values of 0 mean no attenuation, values of -60 represent full attenuation.
See if this provides the features your are needing.

Can MediaConvert mix a background audio file with the main audio

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