Koush's AllCast app allows sending of pictures, videos and music from an Android device to your TV. It works on Apple TV, Chromecast, Roku and Xbox One. Now, developer Koush has come up with another version of AllCast for the Amazon Kindle Fire TV, so it mutes the TV audio and streams it to the smartphone. That will give private viewing experience with your smartphone as the headphone, which is great when one watches films during the night without disturbing the other family members who are sleeping. Or one can quietly play some games on the Fire TV and hears the sounds on the phone so that others are not distracted.

Making use of mobile devices as wireless headphones is not a new concept. It has been used by Roku boxes which remotes have headphone ports for private viewing. Xbox One uses the same concept with a stereo headset adapter.

The upcoming separate version of the AllCast app will be for Fire TV. Unfortunately, it will not work on Chromecast, because unlike the Fire TV, it does not support advanced parsing of video and audio.

It will be available on Amazon's App Store, but not in Google Play. Those who own Fire TV can check out the new app. For those who do not own one yet, it can be purchased from Amazon for $99; and also buy a controller which may cost $40.

The Amazon Fire TV was released early April and comes with a gaming courtesy similar to smartphones. It includes a Snapdragon 1.7GHz 300 Krait processor and Adreno 320 chips to video stream in house video service like NetFlix.