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How can i access cinemadng frame rate using the dng sdk?

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I'm trying to figure out the right way to access the CinemaDNG frame rate using the DNG SDK --- preferably without having to hack up the DNG SDK, since that would have to be redone each time the DNG SDK changes. It looks like all the code has little loops for scanning tag directories, and when something unknown is found, it is dropped silently with no callback, so that there is no way to process out-of-scope tags such as those for CinemaDNG without replicating the original code.

 

On initial study it looks like the Cinema DNG tags, as produced by Blackmagic cameras, are DNG TIFF-like data, not as XMP-only data as the CinemaDNG 1.1 standard seems to suggest (Annex A). I suspect this is because the odds of a separate XMP file being carried around that matches the DNG images is low. Not apparent that they can be retrieved from either place.

 

So I'm wondering what the nominal Cinema DNG overlay onto the DNG SDK is. This is low-hanging fruit.

 

If the entire XMP library was to fall out of DNG and Cinema DNG, the world would be a much simpler place. Too many answers for too little problem. It's taken about a week to get the DNG SDK library to compile on Linux, with Windows still in progress and Mac to go. (cmake another non-helpful thing.... too much that does too little --- that doesn't match my build environment). KISS!


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