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.


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