Create a file with two audio tracks?

[Johan_F]

Hello everyone,
I begin with Shotcut and I want to create a file with two audio tracks and choose between these two tracks when I open it.
I have already create a file with one video and two audio tracks in my timeline. When I export the file and I open it, both audio tracks are superposing (its an MP4 file).
(I think I have to export an MKV file but I don’t know if it will work).
Someone can help me ? Thanks.

[kinuris]

Hello.
You need a multiplexer, or an application that is capable of putting several audio streams into a single file.
Try Avidemux (multi-platform).
Export the video from Shotcut with only one audio stream, and then in Avidemux, audio, select track, load the second stream in the second place.
Greetings

[sauron]

MKVToolnix works as well.
MKVToolnix

[Johan_F]

Thanks guys I will try Avidemux another possibility is to create 2 different files with Shotcut, each one track and use MKVToolnix to assemble (I did that).