Am 16.11.2011 14:48, schrieb Eduardo Oliva: > Hello, I have a py script that reads for all "m2ts" video files and convert > them to "mpeg" using ffmpeg with command line. > > What I want to do is: > > I need my script to run 2 separated threads, and then when the first has > finished, starts the next one....but no more than 2 threads. > I know that Semaphores would help with that. > But the problem here is to know when the thread has finished its job, to > release the semaphore and start another thread.
I suggest a slight different approach: use a queue [1] and create two worker threads that consume the queue. You don't need multiprocessing because you are already using multiple processes here (one Python and two ffmpeg processes). Christian [1] http://docs.python.org/library/queue.html -- http://mail.python.org/mailman/listinfo/python-list
