IScriptEnvironment::AddFunction

[kassandro]

There is a problem with the function IScriptEnvironment::AddFunction in Avisynth 2.52 and probably in earlier versions. When I call this function with IScriptEnvironment::AddFunction(myfilter, myoptions, ...), then Avisynth doesn´t copy the string myoptions. Instead it only saves the pointer of the string. Thus, if the string myoptions is changed after the function call, the string in Avisynth gets changed as well. This is certainly not intended. The situation is even worse, if myoptions was only allocated in temporary memory. Then Avisynth may even crash. Probably the same applies to the string myfilter, but I haven´t checked it.

[Bidoche]

Avisynth is a dummy for string memory management, it don't really handle it.
What it does is allocate large blocks of memory and copy char * into these with the IScriptEnvironment method SaveString (or something like that).

Just use that before and it will be fine.