AirParrot is a software developed to stream video to apple tv and also music from windows device. You can stream any video format using the software. iTunes is another way of playing videos from Windows to Apple TV.
You cannot directly plug your hard drive into the Apple TV and stream video to apple tv. Instead, you can import the movie from the hard drive to the iTunes library and watch it on Apple TV through Home Sharing.
Apple does not support the DVD format. However, you can stream videos from it using suitable software or application. The step-by-step instructions for streaming DVD on Apple TV are given below.
VLC is an important and useful playback tool that supports any video format. The tool lets you access the media files in connected local directories. You can stream VLC using the Remote Playback feature.
VLC may sometimes crash while streaming videos using it on Apple TV. The video may buffer, stop suddenly, or may not stream at all. The solutions to these issues are given here.
Apple TV proves to be a great entertainment solution, but is limited by the number of formats it can play. However, several apps can play these formats; one of them is VLC. It is supported by several operating systems.