The problem we are having is the compatibility seems random on mobile devices.
Some iOS Air devices do not play the videos while others do, we have 3 iOS Air devices and 2 of them do not display the videos only audio. About 50% of Android do not display video or audio.
Some of the device browsers play the videos and some do not. For example on Android some devices with Dolphin browser display the video fine but not in the native browser or Chrome even after install the android flash plugin.
We are using JWPlayer 5 as JWPlayer 6 appears even less compatible in our tests.