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The goal of Netflix’s Master-level Atmos QC is to ensure that all technical specifications are met and any and all errors/ inconsistencies are flagged and addressed.  

General Overview

  • Our expectation, unless otherwise specified, is a full linear review of source deliverable Atmos mix in a unity environment with a theatrical or home entertainment Atmos setup.
  • Must be reviewed in an at minimum  7.1.2 setup.
  • Atmos files do not need adhere to the Netflix True Peak measurement spec.  
  • Limiting for mixes will be done on consumer decode side.
  • Please continue to measure True Peak and mark as an FYI only.
  • Atmos should still adhere to the Netflix LKFS measurement spec and should be noted as an issue if it does not.
  • All Atmos should be conformed to a proxy, which should also be conformed to the final A/V deliverable - Netflix or third-party vendor will supply proxy
  • Atmos should be derived from the original language Printmaster Mix.  It should be a full mix and also contain all object based information.
    • In some cases, it may actually be the source for the 5.1 and 2.0 mixes.
  • Atmos should include ALL elements included in the original 5.1 and 2.0 PM mixes:
    • All dialogue in the original language of the production
    • All music, production sound, sound effects and foley
    • Any treatments applied to the PM mix
    • Correct placement of individual objects in relation to the on screen action

Technical Guidelines

Atmos Mix
Container BWAV ADM
Codec Uncompressed Linear PCM
Bit Rate Highest Possible (CBR)
Bit Depth 24 bit
Sampling Frequency 48 KHz
Track/ Channel Bed Config - 7.1.2
  1. Left
  2. Right
  3. Center
  4. LFE
  5. Left Surround
  6. Right Surround
  7. Left Rear Surround
  8. Right Rear Surround
  9. Left Top Overhead
  10. Right Top Overhead

 

Possible Sound Deliverables

Print Masters

Atmos Printmaster:

Full mixed in at least an Atmos 7.1.2 environment.  Total number of channels should not exceed 128. Total number of audio objects should not exceed an additional 116.

 

Filename Convention

Production materials should have “human readable” filenames - avoid using proprietary catalogue IDs.

Filename convention:

[Project_Title]_[Season#Episode#]_[AssetType]_[Soundfield]_[#Channels]_[SampleRate]_[BitDepth]_
[ChannelMapping]_[Date]

Item

Naming

Example

Project Title

project_title

chefs_table

Season # / Episode #

s[season ##]e[episode ##] or r[reel ##]

s01e01, s01e02 or r01, r02

Asset Type

asset type

PM, ME

Soundfield Type

soundfield type

Atmos

Bed Type

Bed type

7.1.2

No. of Channels

Single or Multiple LCR, 5.0, 5.1, 7.1 or 7.1.2 bed(s)

10ch - 128ch

Sample Rate

[##]k

48k

Bit Depth

[##]b

24b

Channel/ Track Mapping

channel/track designation

matrixed

Date

ddmmyyyy

24072018

12ch Bed plus Objects Atmos Example:

chefs_table_PM_Atmos_712_115ch_48k_24b_matrixed_24072018.bwav

Gear Requirements

  • Mac Pro/Windows PC with minimum 32GB of RAM and 500GB internal storage - additional RAM and storage recommended for optimum playback.
  • Most recent version of Avid Pro Tools.
  • Dolby Atmos Renderer and Dolby Atmos Monitor in Dolby Atmos Production Suite
  • Audio Hardware interface (Thunderbolt or USB) with at least 10 outputs.
  • Recommended multiple TB external hard disk with Thunderbolt interface
  • Dual monitor or dual connection with KVM switch to a single monitor
    • One for Pro Tools
    • One for Video playback
  • Minimum 7.1.2 speaker arrangement
  • Atmos Monitor Controller - Examples:

Atmos Tiering

Two-Pass

Files to be Provided:

  • Video Proxy + (2.0 Audio)
  • Atmos Printmaster audio

Process:

Full linear review of Atmos Printmaster for both technical and content consistency. All errors should be flagged individually. NO examples or blanket durations should be used.

Both passes should evaluate the timing of effects, dialogue, audio fidelity, spatial arrangement of objects and the accuracy of their placement in relation to the on screen action.

Technical issues include, but NOT limited to:

  • Channel Mis-map
  • Clipping/ Distortion
  • Drop-out
  • Hiss
  • Crackle
  • Mono audio
  • Tick/Pop
  • Hit
  • Scratch
  • Missing sound effects
  • Netflix Ident sync/ mix down
  • Object placement in relation to on screen action

The following should be spot compared  against the Primary A/V Proxy and flagged when Inconsistent:

  • Sound effects
  • Music
  • Levels
  • Treatment/Effect
  • Panning/Phasing

One-Pass

Files to be Provided:

  • Video Proxy + (2.0 Audio)
  • Atmos Printmaster audio

Process:

One-pass applies to fix checks/ replacements for previously QCed files.  It includes verifying all issues in the previous QC Report and any additional content changes in an issue by issue spot check.

Once spot check is complete, it is a full linear review of Atmos Printmaster for both technical and content consistency. All errors should be flagged individually. NO examples or blanket durations should be used.

The full linear pass should evaluate the timing of effects, dialogue, audio fidelity, spatial arrangement of objects and the accuracy of their placement in relation to the on screen action.

Technical issues include, but NOT limited to:

  • Channel Mis-map
  • Clipping/ Distortion
  • Drop-out
  • Hiss
  • Crackle
  • Mono audio
  • Tick/Pop
  • Hit
  • Scratch
  • Missing sound effects
  • Netflix Ident sync/ mix down
  • Object placement in relation to on screen action

The following should be spot compared  against the Primary A/V Proxy and flagged when Inconsistent:

  • Sound effects
  • Music
  • Levels
  • Treatment/Effect
  • Panning/Phasing

Reporting

*** Please see our Guide to the Asset QC Ecosystem for additional details ***

“Location” for Atmos Audio issues:

The “location” of an issue within an audio asset should include the mix being analyzed and the Track/Channel name or number. Examples include, but not limited to:

  • Center
  • Right Top Overhead
  • Object in Left Rear Surround
  • 3,7,8, etc.

Measuring LKFS and True Peak:

*** Please See Netflix Branded Content QC Overview Specifications for additional details ***

  • Atmos files must adhere to Netflix LKFS measurement spec.
  • Atmos does not need to adhere to the Netflix True Peak measurement spec. This should still be included as an FYI. 
  • Measure the default 5.1 Re-Render via Dolby Media Meter, Nugen LM Correct or Baton Auto QC.

 

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