1libv4lconvert is not safe for using one convert instance as returned by 2v4lconvert_create from multiple threads, if you want to use one v4lconvert 3instance from multiple threads you must provide your own locking and make 4sure no simultaneous calls are made. 5 6libv4l1 and libv4l2 are safe for multithread use *under* *the* *following* 7*conditions* : 8 9* when using v4lx_fd_open, do not make any v4lx_ calls to the passed fd until 10 v4lx_fd_open has completed 11 12* all v4lx_ calls must be completed before calling v4lx_close 13