What we're working on right now is stream WRITE ability, in order to be able to record OSG-rendered video to any libavcodec supported writable stream.
The frame-centeric osg ReaderWriter Plugin architecture doesn't have exactly the proper API for writing multiple images to a single stream-file, as it considers each frame to be a unique file. But we've found a sensible way to overload the normal usage without adding any jarring new API calls. I could probably look into other improvements while we're in there if anyone wanted them bad enough to put up some funding.
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