I see a lot of them posting Youtube/vimeo videos not in the correct format, please go through this link and post it so that it shows up. use Preview option copiously to see if your video is showing at all
http://www.rcindia.org/electric-planes/for-the-5th-sweepstakes-first-model-k-k-iyer/msg177067/#msg177067 (http://www.rcindia.org/electric-planes/for-the-5th-sweepstakes-first-model-k-k-iyer/msg177067/#msg177067)
Seem like embedding of video was getting messed up due to this.
https://support.google.com/youtube/answer/6098135?p=yt_devicesupport&hl=en&rd=1
Moved to a different embedding software... seems like all Youtube links are supported natively, including shortened "youtu.be" ones.
Great information post. thanks