I have these files:
video.mkv(with no sound)
And I want to simultaneously play
audio_en.mp3 and simultaneously seek in those files (move forward and backward) while playing.
Even better would be playing and seeking at the same time in multiple audio files.
The reason I want to do this is obvious, large files and many different audio tracks. That's why I don't want to concatenate vid and audio1, vid and audio2...