Also, the CODEC used by your Videos seems to be incompatible. Kindly re-encode your video using
Handbrake
. It's a free tool.
While using Handbrake to encode your videos :
Kindly use the default Profile but remember to Check the small Web optimized box from the Handbrake Tool. It ensures the metadata of your video is written at the start, so Flash can swiftly see its duration and dimensions.