2、那么這句代碼在MediaMetadataRetriever.java 中調用 getFrameAtTime(timeUs, OPTION_CLOSEST_SYNC)這句代碼： 解釋一下timeUs,和OPTION_CLOSEST_SYNC這2個變量的含義 timeUs The time position where the frame will be retrieved. * When retrieving the frame at the given time position, there is no * guarentee that the data source has a frame located at the position. * When this happens, a frame nearby will be returned. If timeUs is * negative, time position and option will ignored, and any frame * that the implementation considers as representative may be returned
