Audio language tag not respected after opening video

[jardenblack26]

Hello,

I use Avidemux for remuxing Matroska videos to an MP4 container. My Matroska videos always contain an AAC audio stream and an AVC video stream, and I like the MP4 container for compatibility reasons.
When I open a Matroska video in Avidemux of which the audio stream is language-tagged to English, I always have to go to the Audio Tracks Configuration" panel and set the language tag back from "unknown" to "English".
Could you please change this behaviour, so that the language tag is properly recognized?
Some of my videos have a single audio stream that is in another language, so having the language set correctly would be nice for me, even though my videos usually contain only a single audio stream.

Kind regards.

[eumagga0x2a]

When I open a Matroska video in Avidemux of which the audio stream is language-tagged to English, I always have to go to the Audio Tracks Configuration" panel and set the language tag back from "unknown" to "English".

In case of MKV: works for me using a build compiled from the git master.

On the other hand, the Mp4 demuxer doesn't extract language metadata, so a MKV with a correctly language-tagged audio track remuxed by Avidemux to MP4 will result in a correctly language-tagged MP4, but when loaded in Avidemux, it will always show "Unknown".