This is a chromium specific bug and can be seen on Windows 7 and above after enabling H/W video decoding. The compositor code in the function CCVideoLayerImpl::appendQuads is supposed to ensure that the videos are unflipped for windows. It never executes due to an incorrect #ifdef.
Created attachment 149374 [details] Initial patch
Comment on attachment 149374 [details] Initial patch R=me
Comment on attachment 149374 [details] Initial patch Clearing flags on attachment: 149374 Committed r121214: <http://trac.webkit.org/changeset/121214>
All reviewed patches have been landed. Closing bug.