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+libv4lconvert is not safe for using one convert instance as returned by
+v4lconvert_create from multiple threads, if you want to use one v4lconvert
+instance from multiple threads you must provide your own locking and make
+sure no simultanious calls are made.
+
+libv4l1 and libv4l2 are safe for multithread use *under* *the* *following*
+*conditions* :
+
+* when using v4lx_fd_open, do not make any v4lx_ calls to the passed fd until
+ v4lx_fd_open has completed
+
+* all v4lx_ calls must be completed before calling v4lx_close