Very occasionally, VLC is unable to convert the sound for a movie.
However - it is much more common that your device is just configured to stop sound coming from VLC Streamer!
Please check these
- Make sure your device is not set to mute.
- On some iPads and iPhones, you have a switch at the top right of the device (called the 'ringer switch'). This can control mute/sound. Try flipping it.
- When you swipe up from the bottom of the screen, you can see the 'mission control' settings for your device. On some devices, there is a mute option there (It looks like an alarm bell). Make sure that isn't enabled.
- Make sure you turn the volume up using the volume keys on the side.