Moodle media player not appearing?

Check the following points:

1. Multimedia plugin filter should be enabled under Site Administration > Plugins > Filter > Manage Filters > Multimedia plugins.
2. Then it should be enabled in course and activity as well.
3. The order of the filter under the Site Administration > Plugins > Filters > Manage filters should be correct.

To check the example refer the link  http://moodle.org/mod/forum/discuss.php?d=194684