Hi, Pompel,
Thank you for your feedback on popVideo 3.
About Import video file :
In order to import other video files, like MP4, MTS, M2V, M2T, AVC, M2TS, you would need to install the codec in your system.
After you install K-lite, these files will be compatible with popVideo 3, but they cannot be dragged into program. Please import them from Import File dialog by selecting ALL File (*.*).
About Export video file :
You can output MOV ProRes video with transparent video. Please make sure if your video editor can support this masked video (MOV ProRes) for further editing.
Or you can also export standard Windows AVI format with separate alpha video files.
Jonathan