home  exhibition  quizzes  tour 
  basics  protocol mechanisms  internet  lans  applications  
  video in internet
bit rate | frames per second | frame motion | fades vs. cuts | interlace removal |
 
search  
glossary  
projects  
sitemap  
contact  
Frame Motion

It is the percentage of the pixels that change from one frame to another. This change can result from moving persons or objects, camera or post-production effects. The greater the motion within a video clip, the more information the encoder has to compress.

The following example allows you to choose between two videos with different kinds of content: video no.1 shows static "talking heads" situations, whereas the video no.2 shows scenes of a live concert.

The video no.1 is relatively still resulting in a very good compression. Comparing the two bitrates of the video no.1, you cannot see a noticeable difference between 600 and 200 KBit/s. By choosing the low bitrate you can save two thirds of the bandwidth!
no.1 200 Kbit no.1 600 KBit
figure: 200 KBit/s figure: 600 KBit/s

The video no.2 is harder to encode (the people are moving quickly and the camera is zooming), as there is much pixel change from frame to frame. It needs more bandwidth and the one with higher bitrate looks better.
no.2 200 Kbit no.2 600 KBit
figure: 200 KBit/s figure: 600 KBit/s

Please select one of the given choices and press the Open button. But be careful, for each selection a new window will be opened. If you want to compare the different possibilities, move the windows until you can compare them.