Digital Measurement SEI Audio File

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The Nielsen SEI server-to-server solution (Digital Measurement SEI Content Viewing) needs audio files for each watermarked source that requires crediting.

Audio Compression Type	Tested ideal Compression Rate
AC3 Stereo	192 Kbps or higher
AC3 5.1	384 Kbps or higher
Enhanced AC3	192 Kbps
MPEG2 audio	192 Kbps or higher
AAC with ADTS headers

• If source audio is stereo, include both Left and Right channels
• If source audio is 5.1, take L + .707C into Left and R + .707C into Right and deliver stereo
• Audio sampling rate should be 32kHz, 44.1kHz or 48kHz

S3 Bucket and Prefix Naming Convention

DTVRAudio_<partnerid>_<AssetId>_<UTCStart>_<UTCEnd>

Name	Description
partnerid	Abbreviation provided by Nielsen for each provider or publisher
AssetId	in-house assetId
UTCStart	time in 32-bit unsigned int UTC in seconds from first second of audio captured
UTCEnd	time in 32-bit unsigned int UTC in seconds from first second of audio captured

• Files should be placed in S3 buckets in a mutually agreed upon folder structure.
• 15 minutes of audio does not have to align with hour boundary. For example for broadcast from 1 AM to 2 AM, 4 audio files each with 15 minutes of audio from 1:00 AM to 1:15 AM, 1:15 AM until 1:30 AM, 1:30 AM until 1:45 AM and 1:45 AM until 2:00 AM, but if the encoder turns on at 1:07, deliver through 1:22, etc. The preference is hourly bound but not required.
• If difficult to achieve exactly 15m increments, err towards shorter. I.e. 10m instead of 20m
• Avoid small, fragmented audio files. Watermark decoding algorithms require runway. Too short of a file will result in lost audio codes
• If file times/audio overlap, ingestion will overwrite the portion of the older file
• Precision is important for UTC start/end file naming convention. Use UTC timestamp of Server time/encoder
• The file should not be encrypted.
• One copy per stream only.

Audio Asset Metadata

S3 Bucket and Prefix Naming Convention

DTVRAssetMetaData_<partnerid>_<AssetId>_<UTCStart>_<UTCEnd>

Name	Description
partnerid	Abbreviation provided by Nielsen for each provider or publisher
AssetId	in-house assetId
UTCStart	time in 32-bit unsigned int UTC in seconds from first second of audio captured
UTCEnd	time in 32-bit unsigned int UTC in seconds from first second of audio captured

Header Record

Parameter	Description	Mandatory	Specified by	Format
appid	Nielsen-provided server application identifier	Yes	Nielsen	Example: A487421B-XXXX-YYYY-8343-E3BBB66E44F2
creationtime	File creation time	Yes	Client	Format: Unix timestamp in 32-bit unsigned int in seconds Example: 1577858505
assetid	In-house id used for a video asset	Yes	Client	Format: alphanumeric Example: VID123456789
recordcount	# of records in body of file	Yes	Client	Format: numeric

Body

Parameter	Description	Mandatory	Specified by	Format
audiofilename	Audio file name	Yes	Client	Example: aacFile1.aac
referencestart	Start of in-house reference time for the audio file	Yes	Client	Format: Unix timestamp in 32-bit unsigned int in seconds For VOD, parameter should reflect offset from the start of the asset For Livestream, parameter should reflect in-house time
referenceend	End pf in-house reference point for the audio file	Yes	Client	Format: Unix timestamp in 32-bit unsigned int in seconds For VOD, parameter should reflect offset from the start of the asset For Livestream, parameter should reflect in-house time

SLA

The files must be delivered into the proper S3 bucket within 2 hours of the broadcast. For example files from 1:00 AM to 1:15 AM must be delivered before 3:00 AM.