Xilisoft Apple TV Video Converter is a video conversion tool. It can be used to convert several video and audio formats to formats that are supported by the AppleTV. The input formats accepted are AVI, MPEG, WMV, RM, RMVB, MOV, MKV, and 3GP. And this application can convert those to MP4 (H.264), MOV, and FLV.
As I have come to expect from Xilisoft products, the user interface is very well-designed, and a nice color scheme is used. It has excellent input format support and GPU acceleration, if you have the necessary hardware. Also, you can add as many files as you want to the user interface and convert them to different profiles in one operation. There are eleven conversion profiles, all of which convert files to formats that are easily playable by the AppleTV and most other Apple products, as well as other mobile phones.
I used a 720p MKV file to test the application and converted it to the AppleTV HD profile, which converts files to H.264 in a 1280x720 resolution. The whole process took a little over 2 minutes, which is OK for such a big file. I had no problems with the video at all.