The file the box wroteA recorder writes to its own container, and a generic player often cannot read it. Re-encoding it, or filming the screen, alters the pixels, the timing and the frame references. We export the native file and a copy that plays anywhere.
The recorder's clockThis settles more claims than anything else on the disk. Recorder clocks drift, get set wrong at installation, and are often never put right for British Summer Time. A recording marked 02:10 may not have happened at 02:10. We measure the offset against a reference at acquisition and state it.
Continuity, written downAn exhibit reference, MD5 and SHA-256 at both ends, a dated log of every handover, and notes made at the time. Anything derived from the master gets its own reference.
What did not readA report that skips the gaps is no use to an adjuster. Footage written over is gone. Encrypted footage without the key is gone. Footage never recorded cannot be produced. We say which applies, and where pictures survive without their timings.