Binary file lost using svn merge

I have two branch (let say branch A and branch B)in my svn repository I'm done with one of them, branch B I want to get changes of the other branch ,branch A. On both branch i have binary files,in a separated folder. When i try to get the new binary files of branch A, i get nothing, just tr开发者_运维问答ee conflict.

I use subclipse, merge a range of revision. The branches was created with svn 1.4. Since the repository was moved to svn 1.6.

In fact it was just a bug in the eclipse 's svn client we need to manually select the revision we want and not let eclipse do it