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PythonEval() is a special C++ filter that takes a python function as its argument and returns nothing. it's somewhat similar to std.LoadPlugin() or std.SetMaxCPU() in terms of functionality (an infrastructure function rather than an actual filter that applies some processing to a video clip). its implementation should be something similar to #4274, basically it retrieves the warning messages by calling the foreign python function and sends all retrieved messages to stderr thru vsapi->logMessage()
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