Thanks everyone for the responses! If I understand it correctly, if I installed ffmpeg on itself separately from FS, I could write a module for FS, in which I just call the ffmpeg program by running a command line. This way would it be classified as "not combine them into a larger work", thus free from license incompatibility problem? Not sure if that'll work for real-time transcoding of x264 though? Thanks very much for you opinions! Yufei -- Yufei Tao Red Embedded This E-mail and any attachments hereto are strictly confidential and intended solely for the addressee. If you are not the intended addressee please notify the sender by return and delete the message. You must not disclose, forward or copy this E-mail or attachments to any third party without the prior consent of the sender. Red Embedded Design, Company Number 06688253 Registered in England: The Waterfront, Salts Mill Rd, Saltaire, BD17 7EZ