After a lot of research, the best approach I could find was by splitting the problem in two steps:
- Create a method to mix all the audio files you need using filters and then, export an output file using the format WAV (audio_mixer source code <https://github.com/xtingray/audio_mixer/>). - Create a method that transcodes the WAV file generated in the previous step, into a MP4 file (AAC transcoding example <https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/transcode_aac.c> ). PS: I am aware that including the transcoding process as a filter would be a very fancy solution, but I couldn't find any reference of how to do it.
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