Youtube Captcha - Help

We are opening youtubes URL with our server IP using curl, and when entering the captcha, it doesn't do anything, what do we have to POST the captcha to?

Check the headers. Either use Livehttp headers for Firefox or use the network tab on Chrome's Developer tools.

Then check exactly what is being called when the captcha is delivered...
- Have you included cookies?
- Are you using an appropriate useragent?
- Does it need an additional header such as an ajax based call? (e.g. "XMLHttpRequest").