Abstract: A best available video stream is determined for each of multiple conference participants within a conference room including multiple cameras based on scores determined for video streams obtained from the cameras. The scores are determined based on representations of the conference participants within the video streams, for example, based on percentages of conference participant faces visible within the video streams, directions of conference participant faces relative to the cameras, directions of eye gaze of the conference participants relative to the cameras, and/or degrees to which conference participant faces are obscured within the video streams. The best available video streams are output for rendering within separate user interface tiles of conferencing software.

Abstract: Lithium difluorophosphate, a preparation method therefor, and an application thereof. Lithium hexafluorophosphate and silicon tetrachloride are utilized to generate lithium difluorotetrachloro phosphate, then lithium difluorotetrachloro phosphate reacts with lithium carbonate to obtain a mixture of lithium difluorophosphate and lithium chloride, and then the mixture is purified to obtain high-purity lithium difluorophosphate. The method has simple steps, low cost, short reaction time, and a high conversion rate.