Audio works but I cant see video

Audio works but I cant see video
I am running the latest Plex server on Windows 7 PC
I can access Plex server from my apple TV
Plex Shows my Films avi, mkv etc
When I try to run films - all films - on Apple TV I hear the audio but no video.

Using VLC through my Apple TV All films work fine for Audio and Video.

What can be the problem?
Thanks in advance

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