The same evening can produce two entirely different objects, and confusing them is the most common and most consequential error in this part of the work. An archive is evidence. A broadcast is a programme. They want opposite things from the same cameras.
What an archive is for
An archival recording exists so that somebody in the future can establish what happened. A revival director needs to see the blocking. A rights holder may need to see that the terms were honoured. A dispute about who did what needs a record that was not shaped by anyone with an interest in the answer.
That purpose sets the requirements. Complete, from before the first entrance to after the last call, including the scene changes and the interval boundaries. Continuous and in real time, so durations mean something. Wide, because the whole stage is the subject. And unedited, because every edit is an assertion that something was not worth keeping.
What a broadcast is for
A programme exists for people who were not there and are not obliged to stay. It is shaped: cut for attention, paced, with applause shortened or removed, with the sound mixed for a domestic room rather than for a hall, and with picture graded so that shots match.
Its technical targets come from delivery specifications rather than from preservation. Programme loudness is normalised to a defined measurement, published by international broadcasting and standards bodies, so that a viewer does not adjust the volume between programmes. That normalisation deliberately reduces dynamic range, which is correct for the purpose and destructive as a record of what a hall sounded like.
Neither substitutes for the other
The broadcast edit is an unusable archive. It is incomplete, it is one interpretation, its durations are wrong and its dynamics are compressed. A revival built from it reproduces a television director's reading of a production.
The archive is an unusable programme. It is long, wide, quiet and undirected. Productions that budget for one and expect it to serve as the other end up with a document that fails both jobs.
The archive's real requirements are boring
Format matters less than people expect and integrity matters more. Preservation practice favours formats that are openly documented and widely implemented over whatever a camera produced, because the risk is not that a file degrades but that nothing will open it. Lossless or lightly compressed masters are kept, and viewing copies are made separately.
Fixity is the part most often skipped. A checksum recorded when the file is made, and verified periodically, is the only way to know that a file which appears to be present is actually intact. Silent corruption looks exactly like a healthy file until someone tries to play it, which is usually a decade later.
Copies follow the ordinary discipline: more than one, in more than one place, on more than one kind of medium, with at least one somewhere else entirely. The international reference model for digital preservation formalises all of this, and it is published by a standards body rather than by anyone selling storage.
A file without metadata is not an archive
The recording that cannot be identified is worth very little. What production, which performance of the run, which venue, which cast that night, which understudies, who recorded it and under what permission. Held apart from the file this information disappears; held with it, in a plain text form that does not need special software, it survives.
The cast question is not pedantry. A run of thirty performances with covers going on has thirty different casts, and an archive labelled only with the production title cannot answer the question anybody actually asks it.
Sound for an archive is not the show mix
The recording that comes off the front of house console is a mix made for a room, with reinforcement levels set against the acoustic sound present in that room. Played back through headphones, the acoustic half is missing and the balance is wrong: the reinforced elements dominate and everything unamplified is faint or absent.
An archival sound path therefore needs at least a pair in the house capturing what the room actually contained, recorded alongside the console feed rather than instead of it. The two together allow a usable document to be assembled later. The console feed alone frequently does not, and this is discovered at the point somebody tries to watch the recording.
The permission usually differs too
Licences that forbid distribution frequently allow a single archival copy held by the company and not shown publicly. That distinction, set out in the article on rights, is the reason many productions have an archive and no programme, and it means the archive should be made even when there is no possibility of release.
What we cannot verify
Preservation practice is described in published standards and in guidance from national archives and professional associations, and it evolves; the general principles here are stable but specific format recommendations are not, and we name none. Claims about the longevity of particular storage media come from their manufacturers. Loudness targets differ between delivery specifications and territories, and the applicable figure is the one in the contract with the broadcaster.
The short version
- An archive is evidence; a broadcast is a programme; they want opposite things.
- Archival means complete, continuous, wide and unedited, because durations must mean something.
- Broadcast loudness normalisation is correct for delivery and destructive as a record.
- The broadcast edit is one interpretation and a poor basis for revival.
- Fixity checks, not formats, are what actually protect a file.
- A recording that cannot say which cast performed that night answers nobody's question.