how do you read that code?
A DTS timecode is 20 bits long, with a "Marker" between each frame. There are two types of frames. A Serial Number frame, and a Frame ID/reel ID frame. On trailers, because each trailer has a unique serial number, the frames alternate evenly. On a feature print where there is only 1 serial number across multiple reels, the Serial Number Frame is only present every 16th frame.
Frames are read backward from right to left.
Serial Number frames are just the SN of the trailer/feature - the first 4 bits always 0 0 0 0. For example if you cut off zeros at the beginning of a serial number frame, you may get something like 10100010, which is binary for 162.
Then there is a combo Reel ID/Frame ID. The first 4 bits are the reel ID. All trailers are Reel 14. In a feature film, these would change with every reel. So reel 1 would be 0001, Reel 2 is 0010, and so on. There is no Reel 0, and the highest is Reel 15. Since DTS choose 14 for trailers, if there is ever a film with 14 reels, they skip 14 and use 15 instead. Films with more than 14 reels would have to use a 2nd serial number, and another set of discs.
The next 16 bits are the Frame Count. DTS uses 30 frames per second. Each one has the number of the frame measured from the beginning of the feature reel.
Hope that makes sense. It took me a while to figure out that a 1 is always a short dark spot and a short light spot together, and a 0 is either a long dark spot or a long light spot, depending on what is around it.
There is a picture of how the Reel & Frame ID portion of this works on the following website:
http://daryl.dostech.ca/blog/2007/06/08/
The above picture has the image "reversed" from the way I normally thread it up and read it (reel ID would be first)but you get the idea of how to count it out.
[This message has been edited by muviebuf (edited August 02, 2008).]
[This message has been edited by muviebuf (edited August 02, 2008).]
[This message has been edited by muviebuf (edited August 02, 2008).]
[This message has been edited by muviebuf (edited August 02, 2008).]