Who can give me some advice on the use of blocksTrait?
one mediaElement,one proxyElement which wrapps the mediaElement,if I want to block the seekalbeTrait in the mediaElement,then I can call the blocksTrait in the proxyElement to implement it?
The definition of the blocksTrait aims to do what other?
Will somebody give me some advice?
Yes, that's exactly what blocksTraits is intended for. In fact, we've got an example integrated into the ExamplePlayer showing how to use a proxy to make something unseekable.
Usage (search for "unseekable"): http://opensource.adobe.com/svn/opensource/osmf/trunk/apps/samples/framework/ExamplePlayer /org/osmf/examples/AllExamples.as