NAB Technology & Digital Tools 2

Question 1

Which video codec is most commonly used for OTT (over-the-top) streaming delivery due to its high compression efficiency?

Accepted Answer

H.265 (HEVC)

Answer

H.265 (HEVC) offers approximately 50% better compression than H.264 at the same quality, making it the preferred codec for bandwidth-efficient OTT delivery.

Question 2

What does the acronym SDI stand for in broadcast infrastructure?

Accepted Answer

Serial Digital Interface

Answer

SDI (Serial Digital Interface) is the professional broadcast standard for transmitting uncompressed digital video over coaxial cable.

Question 3

A broadcast engineer needs to measure loudness for compliance with CALM Act requirements. Which unit should they use?

Accepted Answer

LKFS

Answer

LKFS (Loudness, K-weighted, relative to Full Scale) is the measurement unit specified by the CALM Act and ITU-R BS.1770 for broadcast loudness normalization.

Question 4

In digital broadcasting, what is the purpose of a PCR (Program Clock Reference)?

Accepted Answer

To synchronize the decoder's clock with the encoder

Answer

The PCR is embedded in MPEG-2 transport streams so that decoders can lock their local clock to the encoder's clock, ensuring proper audio/video synchronization.

Question 5

Which technology allows a broadcaster to insert targeted ads into a live stream for individual viewers?

Accepted Answer

SCTE-35 with DAI

Answer

SCTE-35 cue markers combined with Dynamic Ad Insertion (DAI) allow broadcasters to replace linear ad breaks with personalized ads for each viewer.

(NAB) National Association of Broadcasters Certification Practice Test

(NAB) National Association of Broadcasters Certification Practice Test

NAB Technology & Digital Tools 2