Merge audio into video witch has a sound #2
Description
Hello, thank you for such a good example to work with media files. I've also read your article from here https://sisik.eu/blog/android/media/mix-audio-into-video
I'm trying to implement something to merge audio file into video witch already has a sound, and when I add a new track to the video file, after merge only new audio starts playing and video original sound not playing at all.
For example, this application can do that functionality, and you can slow a new music sound, and after the merge, in the final mp4 file, you can here video original sound and an audio sound.
https://play.google.com/store/apps/details?id=com.andromania.audiovideomixer
I think, to implement this, I must firstly merge video sound and music files, and only after that merge the result with a video file.
Could you help me to implement this functionality?