Samsung UD6400 Video Streaming Question

My first post to this forum so please go easy on me.....
I just purchased the Samsung UD6400 series LCD/LED TV. I have AT&T Uverse, a Sony Blu Ray and XBOX 360, all connected to the TV via HDMI. With this TV [which is bad-***, BTW - amazing picture quality and functionality] one can stream video files directly from another hardware device such as a PC without having to use a "conduit" such as an Xbox, PS3, etc....
So, on my PC I have a number of video files. However, when I access these files via the TV, either, a) a number of files are not visible; and, b) those that are visible cannot be played. As far as the latter issue is concerned, the files are your basic AVI, MPEG types and appear tyo meet the TV's requirements re: their bitrates and framerates. The eManual which comes with the TV is useless and, therefore, I am at a loss to understand why the files won't play/are not recognized.
Can anyone help? Many thanks.

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(NT) Install this
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Besides the software.

It's well discussed that only a narrow list of encodings will play without issue. That list must be some 1% of the content I've seen people download.

However you write basic AVI. That's a real confuser since AVI is not an encoding but a CONTAINER of encoded content. There is no such thing.

I know, I know. Why should everyone have to become an expert at video encoding.

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