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In fact the question is the other way round:

I shoot a HD video with my Nikon-D7000, and along the way things happen, such as I change zoom, focal length, light levels change such that the D7000 adjusts its sensitivity during the recording...

Is all this data available for reading somewhere, and if yes how?

I could not find the information on regular websites (Nikon's, www.imaging-resource.com, general google search).

I tried exiftool, but it seems to only show general metadata that is true for the overall video recording.

So is this data recorded somewhere, and can I read it on my Linux system?

Any answer or hint appreciated.

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Can't answer your question, but I've done some analysis of Canon MOV files and have concluded that they do not store real time changes to EXIF metadata, they store a single EXIF block similar to what goes into a RAW or JPEG file. –  Miguel Jan 6 '12 at 4:52
    
Thanks Miguel, sounds like I might be out of luck, as it seems to me that since they already use exif, it would be the best vehicle for that sort of data. –  asoundmove Jan 6 '12 at 5:08
    
Again, not the answer you are looking for, but for Canon shooters the Magic Lantern open source firmware has a "movie logging" option. This writes a .LOG file alongside the .MOV that includes lens and exposure changes throughout the movie with timestamps. Pretty cool. –  Miguel Jan 7 '12 at 20:03
    
@Miguel, wow, I wish I had something like this for my Nikon! –  asoundmove Jan 8 '12 at 15:17
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1 Answer

up vote 4 down vote accepted

No. Standard video formats do not work like that and the D7000 is no exception to this. Conceivably it can be done but I am sure it is not on anyone's priority list. I worked for 9 years on video processing and rendering software and there are more important problems to solve. Indexing and managing that data would also become a problem. When working on functions that process video from a series of still images, it makes it vastly simpler to assume the metadata of the first frame applies to all subsequent ones.

Obviously I understand why it would be desirable but this is the same on all cameras. GPS is another perfect example. On cameras with built-in GPS, only the location of at the time video recording starts is recorded while you may be shooting from a moving vehicle and cover some ground while recording.

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H.264 standard allows inclusion per-frame metadata and it's used for in video streams of security cameras. But I agree with Itai in that it's probably not one of the top wanted features. –  che Jan 6 '12 at 10:44
    
Interesting. I've worked on video for TV and Films, so I didn't know about the use in security cameras. What per-frame data do the use? –  Itai Jan 6 '12 at 17:19
    
You mean what's in the payload? Things like motion detection info, relay input states, tampering detection and so on. –  che Jan 6 '12 at 21:34
    
@Itai, thanks. Not the answer I wished to have read, but informative and to the point. –  asoundmove Jan 7 '12 at 3:21
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