How do you decompress a zlib'd string located in a file with  php ?

I need to dynamically write a password string into a movie file.....
It appears that in QuickTime movie API, all sprite variables/values are zlib'd inside the movie file

So I need to:
find the string
decompress a zlib'd string inside a file.
change its value => password=new_password
recompress the new value
write the zlib'd string back to the file

I'm sure if I can decompress the string, then it will not be too hard to do the rest :)

many thanks
g

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