Hi, You may be able to use ffmpeg (the program not the library) via pipe as described in the "writing section" here: http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/ They use Python but it should work with C++ as well, I assume. And using the program should be possible even for non-GPL software. Best, Michael.