Mastering

Mastering is the final technical preparation step that converts an approved edit and grade into the deliverable formats required by each distribution platform — theatrical DCP, streaming HDR and SDR, broadcast IMF, Blu-ray, social media versions, archival. It is distinct from grading (creative color work) and finishing (effects compositing, titles), focusing on format conformance, metadata, quality control and version management. A typical mastering session generates multiple parallel deliverables from a single source master: a 4K UHD Dolby Vision IMF for Netflix, an HDR10 4K Blu-ray ISO, a Rec.709 SDR HD for broadcast, a stereo and 5.1 mix for SDR and an Atmos mix for HDR. Each deliverable has strict specifications — Netflix's NP3 spec, Apple TV+'s technical guidelines, EBU R 128 for broadcast loudness, DCI for theatrical — that govern color space, bit depth, codec, container, audio levels, subtitle timing and metadata. Mastering engineers use tools like Colorfront Transkoder, Telestream Vantage, Marquise Mist, MTI Cortex and AWS MediaConvert to encode and validate. Quality control (QC) is mandatory: both automated (Vidchecker, Baton) and human review of every frame and every audio channel. The mastering deliverable is what the rights holder archives — a single master should serve all future distributions, which is why archive formats like IMF App 2e or ACES MXF/DCDM are preferred. Reference: Netflix Encoding Specifications, DPP technical delivery standards, SMPTE ST 2067 (IMF).