Real-time MPEG video encoding method of maintaining synchronization between video and audio

A real-time MPEG video encoding method of maintaining synchronization between video and audio, comprising:

• a system performance checking procedure for estimating a performance of a system and predicting a number of frames that can be encoded per second by the system;
• a frame-type output sequence selecting procedure for selecting an frame-type output sequence for a plurality number of frames included in a group of pictures (GOP) in accordance with said number of frames that can be encoded per second with reference to a frame-type output sequence table;
• and
• a frame encoding procedure for performing an MPEG video encoding on received frames in accordance with one frame type corresponding to said frame-type output sequence.

A real-time video encoding method for null frames used in MPEG video encoding to compensate lost frames, said method comprising:

• receiving a null predictive frame;
• generating a discrete cosine transform coefficient by using a discrete cosine transformation;
• quantizing said discrete cosine transform coefficient to generate a quantized discrete cosine transform coefficient;
• and
• encoding said quantized discrete cosine transform coefficient and a null motion vector by a variable length coding so as to output said null frame.