There are complaints and a statement from Google over the fact that Google removed the search filter "Playable on Google" on Google Video. The complaints can be seen in this Google Web Search Help thread.
Less than a year ago, we captured a picture of Google Video that showed the "Playable on Google" option. It basically allows you to filter videos to only display videos that can be viewed directly in Google Video, as opposed to going to the video's web site. Here is a picture of what the link looked like:
Now, it is no longer there and will not come back any time soon.
Sara H. from Google said:
We appreciate your thoughts on the old "Playable on Google" feature.
We have no plans to restore it at this time, but your feedback means a lot to us and we will keep it in mind as we develop new features for Google Video Search.
So there you have it - it is gone.
Forum discussion at Google Web Search Help.