Some users want the Youtube autoplay option since autoplay is already available for some sites (such as Soundcloud).
There is no short-cut but an easy tweak is available if you want Youtube autoplay.
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Instructions:
Copy the video url from the address bar:
Here is an example Youtube video url:
http://www.youtube.com/watch?v=1SuXOnBmDm8
Paste the url in a post using the html editor.
Now look out for this part in the url
watch?
delete it completely.
Here is how the video url looks after watch? is deleted:
http://www.youtube.com/v=1SuXOnBmDm8
Now add a / after v and also delete the =
This is how the example url looks after these modifications:
http://www.youtube.com/v/1SuXOnBmDm8
The first part of your job is finished.
Now copy the following code and paste it using the html editor:
[gigya src="PASTE-MODIFIED-URL" flashvars="autoplay=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"]
See the part that says PASTE-MODIFIED-URL in the above code?
Delete it completely. Copy the modified url and paste it in its place.
This is how the code looks after the change:
[gigya src="http://www.youtube.com/v/1SuXOnBmDm8" flashvars="autoplay=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"]
You can see a working example in a free wordpress.com blog here:
How to enable Youtube autoplay in a wordpress.com blog