Hello,

I try to create a HLS from an MP4 video input file as well as 1-n audio tracks (AAC) by calling this command

```
mp4hls --output-dir=/tmp/123 [type=audio,+label=audio,+language_name=eins,+language=eins]audio-1.mp4 dev_sample_video_1280x720_1mb.mp4
```

The file `master.m3u8` that is being generated from this command contains an "Audio" section that contains an unspecified language name "Unknown" and language "und". How can this be? I did not specify this audio & language. Where does it come from?

```
# Audio
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="eins",LANGUAGE="eins",AUTOSELECT=YES,DEFAULT=YES,URI="audio/aac/eins/stream.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="Unknown",LANGUAGE="und",AUTOSELECT=YES,URI="audio/aac/und/stream.m3u8"
```

For other video files that I used, I see additional audio channels like "Ger" and "Eng" that I did not specify as well. I don't know where this comes from and wonder why these information are being added automatically by mp4hls.

Has anyone an idea what the problem could be?


HLS with multiple audio channels: mp4hls creates additional "random" audio channels. Why is that?
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : HLS with multiple audio channels: mp4hls creates additional "random" audio channels. Why is that?
Issue date:

--- start body ---
Hello,

I try to create a HLS from an MP4 video input file as well as 1-n audio tracks (AAC) by calling this command

```
mp4hls --output-dir=/tmp/123 [type=audio,+label=audio,+language_name=eins,+language=eins]audio-1.mp4 dev_sample_video_1280x720_1mb.mp4
```

The file `master.m3u8` that is being generated from this command contains an "Audio" section that contains an unspecified language name "Unknown" and language "und". How can this be? I did not specify this audio & language. Where does it come from?

```
# Audio
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="eins",LANGUAGE="eins",AUTOSELECT=YES,DEFAULT=YES,URI="audio/aac/eins/stream.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="Unknown",LANGUAGE="und",AUTOSELECT=YES,URI="audio/aac/und/stream.m3u8"
```

For other video files that I used, I see additional audio channels like "Ger" and "Eng" that I did not specify as well. I don't know where this comes from and wonder why these information are being added automatically by mp4hls.

Has anyone an idea what the problem could be?


--- end body ---
