is using a best-effort algorithm to maintain a low bandwidth when transmitting video. You can adjust the video quality between 1 and 100%, and the number of transmitted images per second in the Video Codecs section of the preferences. It will permit  to dynamically adjust the video bandwidth and the number of transmitted images per second during a call while trying to respect the requested video bandwidth.Notice that the algorithm is a best-effort algorithm, which means that if you are giving too high values for the minimum video quality and frames per seconds to transmit, it will be impossible to respect the requested video bandwidth. However, if the video bandwidth permits to transmit with a better quality, or faster than the requested values, then  will dynamically increase them so that the quality and the framerate are always the best possible.Choosing a higher framerate and a lower quality will have the same result in terms of video bandwidth than choosing a higher quality with a lower framerate. It depends if you prefer using your bandwidth to transmit more lower quality images or fewer big quality images.
