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from my webhosting company:

so is ffmpeg kind of like the GD engine that processes images on the server? if I am not mistaken, GD is a server-based application, and php has an API to it ... it is the API that I interact with in php scripts. IF so then getting ffmpeg is a process, really: 1 - download 2 - install onto server 3 - learn how to interface with it via php ... is this correct? -- thanks.

to be honest, I still don't understand ffmpeg ... if you go to the wiki it doesn't even mention php. I keep seeing people refer to 'command line' software, but I am looking for a php script that can do all the conversions.

is there a library that can convert between these filetypes: mp3, wav, ogg, webm thanks, dsdsdsdsd

aha of course ... and it worked as you said ... thanks! I have since learned that facebook apps have a app_secret that is intended to be secret, and that that is included in the $_REQUEST sent with the child_index.php ... I suppose that child_index.php will check for that ... getting ready to test it. thanks for your answer!

Christian, thanks for responding; your response is helpful. I am trying to create the scenario, so I made 2 php files, iframe__parent.php and iframe__child.php // iframe__parent.php <?php $_REQUEST[ "signed_request" ] = "blah" ; ?> ... <iframe src = "iframe__child.php"> </iframe> ... // iframe__child.php <?php print_( isset( $_REQUEST[ "signed_request" ] ) ) ; ?> // ..... returns false so although I understand that it is possible (otherwise how would facebook do it, right?), but how? thanks for your time, Shannon

I guess another way of asking this question is: If I load somebodys_url into an iframe on my_page, can I inject values into the $_REQUEST array that accompanies that request for their page? please see my first post for the explanation of why I want to know this.

I have my_app which is intended to be accessed only as a facebook canvas app, and I am looking for a solid test which my_app will perform during the loading phase to verify whether it or isn't being loaded into a facebook iframe. So one approach I am looking at is to check the $_REQUEST array. In a legitimate facebook iframe, the $_REQUEST[ "signed_request" ] is readable. But I would like to know if somehow another webpage could attempt to load my_app and send a fake 'signed_request'. - thanks, Shannon