Add audio stream to MP4 from a different source.

[baglio]

Hello everybody,

I'm conducing a little experiment. I have a high resolution MP4 (h264) movie in english (AC3 6 Ch.), and the same movie in a lower resolution and different video codec but with the audio stream in my native language (Italian, also AC3 6Ch.).

What I'd like to do is to mux the higher resolution MP4 with the italian audio.
Now, I obtained the audio stream by demuxing the second file, but when I try to mux it with the first, something wrong happens: although the process seems to be done, the file isn't playable if the audio stream is set on the one I've just muxed in from the second file, while english audio stream works fine.

I hope someone could help me figuring out what I'm doing wrong.

Thank you, and sorry for my particular english.

[Baldrick]

What do you mux with? Mymp4boxgui?

[baglio]

What do you mux with? Mymp4boxgui?

I do it with Subler.