The invention relates to a MPEG video decode method, especially decoding the input stream at 44.1 kHz sample frequency, wherein said method comprises: checking the first synchronous word of input stream, and decoding the report head except from the synchronous word; via said decoding, calculating out the accumulated frame length (AFL); if the frame length has been calculated, checking next synchronous word, and checking the report head information, judging if there is mistake; if there is not mistake, calculating the frame length, to decode the frame. |