MkvToMp4 program produces a video with no audio

[synnchan]

I'm creating a new thread cause I got a new problem.

I'm trying to convert an .mkv file into .mp4 and while the output video plays perfectly, there's no audio.

Here is the original video's info: https://forum.videohelp.com/images/imgfiles/98H2voy.png

Here is a video showing exactly what I did: https://www.youtube.com/watch?v=NXVARkaH_7I

As you can see, the original .mkv file plays audio, but the output .mp4 doesn't. How can I fix it so I can have audio on the .mp4 as well?

[poisondeathray]

Not possible to mux PCM wav into MP4 container using open source muxers. You would have to convert to audio to a compatible format such as AAC

[synnchan]

How can I convert to AAC? Can MKVToolNix do it?

[poisondeathray]

How can I convert to AAC? Can MKVToolNix do it?

mkvtoolnix cannot convert, only mux

I thought mkvtomp4 had option to convert the audio ? If not you could use something like avidemux or ffmpeg (or some gui for ffmpeg like xmediarecode, ffqueue)

[synnchan]

I've just tried avidemux and it works. But I'd still like to know how to convert the audio with mkvtomp4. I don't see an option for that there, but I may be missing something.

[poisondeathray]

But I'd still like to know how to convert the audio with mkvtomp4. I don't see an option for that there, but I may be missing something.

I've actually never used it.

In the screenshots , audio tab, do you have AAC checkmarked for "enable" ?
http://forum.doom9.org/showthread.php?t=163050

Or maybe you have to select a preset ?

[synnchan]

In the screenshots , audio tab, do you have AAC checkmarked for "enable" ?

Yes, I have it enabled.

So... I uploaded two videos to a forum - they're exactly the same video, just encoded differently. One of them worked, the other didn't. Here's the info about them:
https://forum.videohelp.com/images/imgfiles/kLbcUih.png

The left one worked, the right one failed. Can anyone tell me what made the right one fail to play?