Hi needhelp338!

Is there a way to embedd a video (mpeg, wmv etc) in a post so that when people open a post, the video plays automatically ?

Although - theoretically - it would be possible to embed video by means of the <object> tag (search for 'Object'), it rarely works satisfactory (you simply cannot assume a user will have the player/codec installed).

Or how about a flash video, swf or flv file, will the video play automatically if we put the html codes in the post ?

Flash is evil...
Further reading

I would like to put videos in a post, but I want the video to play automatically when people open the post.

For me this would trigger my shortening reaction (I would never expect this in a forum).

Any advice would be appreciated.

You may modify the code...
... and primarily the database structure (you have a lot of space and traffic handy?)
Hint: BLOB (MEDIUMBLOB = 16 MB / entry)