Hi! I'm creating an audio transcription site. I'm stuck on the most important part of the website. the site needs to charge per minute of the audio to be transcribed. when the client uploads the mp3 file in the file uploader, it needs to look at how long the file is, and instantly add that charge to the cart. I'm charging $1.00 per minute, so if the audio file is 10 minutes, $10 should pop into the cart. there are other websites that do this. http://www.rev.com is one of the few. if anybody could at least point me in the direction of a plugin or script to make this happen, it would be greatly appreciated!! I'm completely lost!
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