Editing Digital video (section)

====Constant bit rate versus variable bit rate====
BPP represents the ''average'' bits per pixel. There are compression algorithms that keep the BPP almost constant throughout the entire duration of the video. In this case, we also get video output with a [[constant bitrate]] (CBR). This CBR video is suitable for real-time, non-buffered, fixed bandwidth video streaming (e.g. in videoconferencing). Since not all frames can be compressed at the same level, because quality is more severely impacted for scenes of high complexity, some algorithms try to constantly adjust the BPP. They keep the BPP high while compressing complex scenes and low for less demanding scenes.<ref>{{Cite book |last=Weise |first=Marcus |url=https://www.worldcat.org/oclc/1295602475 |title=How video works |date=2013 |others=Diana Weynand |isbn=978-1-136-06982-6 |edition=2nd |location=New York |oclc=1295602475}}</ref> This way, it provides the best quality at the smallest average bit rate (and the smallest file size, accordingly). This method produces a [[variable bitrate]] because it tracks the variations of the BPP.