Hello, In my project I get mpeg4 video stream from a network (proprietary protocol) and mux it into some container (say avi). Now we'd like to put a protecting "watermark" on this stream. Just to clarify: I don't mean a semi-transparent text over the video, but a digital signature of the stream, which would verify its authenticity. I know MS WMV format supports such a feature through special watermarking DMOs, but as for standard mpeg4 video streams in standard containers (avi, mp4 etc) - I haven't managed to find sufficient information. So I've got several questions: 1) Is it theoretically possible to add such a signature to mpeg4 video - either in avi or any other container? 2) Is it possible with libav* (with or without recoding the original stream)? If yes, what APIs should I look at? 3) If I already have a signature, is it possible somehow to store it along with the stream, as a metadata?
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