Original, uncompressed recorded master — archive and reference for all distributions and formats. Stored like precious materials under controlled conditions.
Master Tape
You've made the final editing decision, the color correction is spot on, the sound is mixed — now it's time for the master tape. This isn't just a copy, but the original data carrier in the highest quality, from which all further versions — DCP, streaming, TV, Blu-ray — are derived. Here you store uncompressed or minimally compressed data, usually in ProRes 422 HQ, DPX sequences, or even uncompressed 10-bit material. The master tape is your insurance policy against future formats and technical requirements that you don't know about today.
In practice, this means: you archive the master tape with physical redundancy — at least two independent copies, spatially separated, ideally in LTO format (Linear Tape-Open) or on long-term stable HDDs. A damaged or lost master tape is a catastrophe. You can't simply re-master from the ProRes export for Netflix if a new format is required in five years. Quality losses accumulate. On set or during editing, people don't think much about it — it's a post-production matter, the domain of the DI suite or the online editor. But there, it becomes the core asset: without a solid master tape, there are no certified cinema DCPs, no archive-worthy long-term assets.
Typical workflow: You render out of Premiere or Resolve, hand over uncompressed video with embedded timecode and finalized audio to the mastering department. They create the master tape according to DCI standards or in-house archive standards. Metadata, technical specifications, and version numbers are documented. No shortcuts, no compromises. Some productions outsource the master tape to specialized archives or film archives — this is invaluable for documentaries or future restorations. Do not confuse this with the mastering process itself, which refers to quality control and final optimization. The master tape is the result, not the activity.
The most common mess: Someone saves the master tape on an external SSD in the office but doesn't pass it on. Only during archiving does one realize that no redundant system exists. Or — even worse — the original editing sessions are deleted, and only MP4 proxies remain. Then you're trapped if you need an adjustment later. The master tape must be treated as the final reference and backup for all future deliverables.