(10) 2. What is the benefit of VBR versus CBR encoding?
VBR encoding provides better picture quality at a lower average data rate because scenes of higher visual complexity (action scenes, fast fades, or pans) can use a higher data rate than scenes with low visual complexity (a tripod mounted shot of a person speaking). In a CBR encode, the data rate never varies. Consequently scenes with high visual complexity suffer in quality, while scenes with low visual complexity have a higher data rate than needed to maintain a good image.