Digital Measurement SEI Audio File
From Engineering Client Portal
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 |
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.