Some live streaming apps, such as Netflix, Amazon Instant Video, HBO Go, and most sports/TV apps, either use their custom protocol or prevents connections that are not originating from an iOS device. Some of the service providers behind these apps also prevent an Apple TV to consume content over AirPlay.
We are looking into ways of implementing support for this in future versions of AirServer, but in the meantime, you should be able to stream content over mirroring in some cases.
If you receive error code 12643 or -12936, it is because the app is using an unsupported type of live-streaming encryption. Some Windows users may see a “Direct Show cannot play this video” message in this case.