I’ve been asked to delete some duplicate recordings from DMU Library’s Off Air Recording service. We record duplicates because some recordings can be affected by:
- atmospheric conditions
- other programmes that can run on, e.g. golf
- mistakes in the electronic programme guide
The report I’ve been given has 54 programmes in it. Which, almost logically (thinks Phil), will free up space for 54 programmes. Programmes, typically, can be 15, 30, 60, 90, 120 minutes and 60 minutes represents, typically, 4GB. All recordings contain the original MPEG-TS MPG, the programme metadata, the high quality H.264 MP4 and the compromised quality H.264 MP4.
The duplicates deletion will only free up 54 programmes worth. I’ve done some digging about to create some statistics around the usage of the service. Teenage Caveman is a very popular film (maybe David Cameron would like the British film industry to make lots of films like this one.) Many recordings have not been watched more than 5 times. Does this mean that they are not being advocated by academics to students? Many have never been watched. That does that mean we should delete programmes that have never been watched? No, because some were only recently recorded. The oldest recording in the top 10 viewed programmes was recorded May 2010 and has been watched 38 times in ~19 months. Was it advocated to students or do users come across the recording via the library’s catalogue?
This short investigation shows that a significant amount of storage could be freed up on the server. It could inform policy surrounding the service or, simply, add to the debate about what to do with the service.