Hey sorry for being a first-poster but I don't know anything about FFmpeg.

What I have is a file that contains 5 audio streams that I want to replace. Doing this in Subler it works perfectly; I just open the file, delete the audio streams and insert my own ones, Subler automatically keeps the rest of the file (e.g. meta data) and I can export. Unfortunately I couldn't achieve this behavior with FFmpeg yet. What I tried is

Code:
ffmpeg -i file1.mp4 -i audio.mp4 -vcodec copy -acodec copy -map 0:0 -map 1:0 -map_metadata 0 next2.mp4
But then I get a video file with 2 (instead of 5) audio streams, it just drops the other ones that I did not replace. Also, the meta data gets lost on the way and I can't play the track as an audio file anymore (only video players will open it then), which is something that was possible with the original file before.

Any ideas?

Thanks a lot
Alex