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Each line of the frame cache file is like the following:
/frames/E13/LHO/frames/hoftMon_H1/H-H1_DMT_C00_L2-9246,H,H1_DMT_C00_L2,1,16
1240664820 6231 {924600000 924646720 924646784 924647472 924647712
924700000}
The description is as follows:
1.1) Directory path of files 1.2) Site 1.3) Type 1.4) Number of frames
in the files (assumed to be 1) 1.5) Duration of the frame files.
2) UNIX timestamp for directory modification time.
3) Number of files that that match the above pattern in the
directory.
4) List of time range or segments [start, stop)
We store the cache for each site and frameType combination as a
dictionary where the keys are (directory, duration) tuples and the values
are segment lists.
Since the cache file is already coalesced we do not have to call the
coalesce method on the segment lists.
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