Video framedropping strategy based on grading mechanism

A video framedropping strategy based on a grading mechanism is disclosed. A technology field relates to the multimedia audio and video playing field. A video framedropping strategy during an audio and video synchronization process is disclosed. A purpose of the invention is to provide a framedropping strategy which preferentially guarantee the audio and video synchronization and aims at smoothly and fluently playing the video. A scheme comprises the following steps: according to human sense sensitivity, setting three level thresholds; during playing the video, assuming a time stamp of a current video output frame to be T, a synchronous clock to be S and then acquiring that video output time delay D=T-S; after acquiring the time delay D from a video output terminal, notifying a video decoder; determining whether the frame is dropped or not when a video decoding unit decodes next frame data. By using a one level, a two level and a three level threshold of the invention, smooth and synchronous playing of the vid