The VideoLAN Forums

I'm using VLC for Android on a Fire TV. Also I used AVI and MKV files that have two audio channels and subtitles included in the same file. (So there is no extra SRT-File).

While it works on the PC version it does not seem to be possible to change audio track and subtitle options in the Android version on the Fire TV. Is there any possibility?

Yes, with the button on the left of 'Play/Pause'

This is exactly my issue. The "button on the left of 'Play/Pause' simply rewinds 10 seconds. There appears to be no way to change the audio track of VLC android 3.3.4. Is there any other version where this feature works?

It changed in the meantime.
Use the lower left button:

To get the tracks listing: