Is there any opeensource library available for php that we can use to encode mp3 without paying fee. I will be using mp3 encoding on my website. If not can you tell me how much fee we have to pay for recording ten minutes sound clip.
Legally, no, mp3 is patent encumbered so you have to pay to use it. That's not to say that libraries don't exist, just look at the long list of products that exist to rip a CD into mp3 encoded files. However, if you are putting it on a public website, you really should do this the proper way.