Head Slate Labs

Software for production and post-production studios.

We build tools for the stages where a mistake costs the most: delivery, conform and paperwork. The first one is Masterproof.

Masterproof Pilot programme

Check the master before the broadcaster does.

Masterproof automatically checks commercial and promo files against broadcaster and platform technical specifications. Instead of a rejection from QC, you get a report with the exact cause and timecode before the file leaves the studio.

Batch summary report4 files · 3 packs
FilePackResult
spot_A_30s_TVN.mxfTVN MediaPASS
spot_A_30s_TVP.mxfTVPFAILTrue peak −0.4 dBTP (max −1.0)
spot_B_15s.mxfTVN MediaPASS WITH NOTESShort-term loudness −17.2 LUFS
spot_B_15s.mxfTVPFAILDuration 15 s + 3 frames
promo_C_20s.mp4YouTubePASS WITH NOTESInterlaced — deinterlace before upload
Illustration of the report layout, not client data.

Broadcaster spec packs

TVP, TVN Media, Polsat and YouTube to start. Every value cites the broadcaster’s document and its verification date.

A whole batch at once

Dozens of spots in a queue. The summary report shows which files pass and which go back for a fix.

One measurement, many broadcasters

The same spot evaluated against several specifications without analysing the file again.

Loudness per EBU R128

Integrated loudness, true peak and, for short-form content, maximum short-term loudness (EBU R128 s1).

Picture and structure

Codec, bitrate, interlace and field order, AFD, signal range, black, freeze, silence, frame-accurate duration.

Reports with your logo

PDF and HTML with event thumbnails, a loudness graph and the file’s SHA-256 checksum.

How it works

Three steps at the editor’s desk.

  1. Point to files or a folder

    On a local drive or Box Drive. A watch folder checks new files on its own.

  2. Pick the broadcasters

    One or several: Masterproof evaluates the file against each specification from the same measurement.

  3. Get the reports

    A batch summary and per-file reports, ready to send to your client.

Packs to start with
  • TVP (Poland) — HD commercialspublic specification
  • TVN Media (Poland) — HD commercialspublic specification
  • Polsat (Poland) — HD commercialsin preparation
  • YouTube — upload recommendations (SDR)public recommendations
  • EBU R128 and R128 s1 — loudnessEBU standard
  • EBU R103 — video signal rangeEBU standard

Your media stays in the studio.

Masterproof runs locally on a Windows workstation (macOS in preparation). Analysis never sends files or any part of them over the network, which matters for pre-air material.

Every report states which version of a specification the file was checked against and where each threshold comes from. Masterproof helps catch problems before delivery; it does not replace the broadcaster’s own QC or a certified photosensitive epilepsy (PSE) test.

Join the pilot programme.

We are looking for a few studios that regularly deliver commercials and promos to broadcasters. The pilot is free — in return we ask for feedback and examples of files rejected in QC.

Get in touch [email protected]

More tools for post-production are on the way.