I have found that the line seems to whether the video is embedded or
not. For example, when I go directly to youtube and click on a video
there, it starts automatically. If the youtube video is embedded in a
blog, it does not start until you click it. I think there are three
good reasons for this:

One is, as you mentioned, there is content to read, which may
influence the user's decision to watch the video. 

Second, there may be many videos on the blog, and the user does not
want them all to start at the same time.

Third, when going to YouTube the user knows that they are going to
get a video, so clicking on the link is a tacit decision to watch the
video. If I go to a blog, the user may not expect to get a video, and
it would be interruptive to have it play without a decision being
made on the user's part.

That said, I think it comes down to how important the video content
is. If it is sort of "ambient" AND it is the only video on the
page, then it probably doesn't matter if it starts automatically.
But if it contains important information, then you probably want the
user to direct the action.


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Posted from the new ixda.org
http://www.ixda.org/discuss?post=33377


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