Video encoding method, video encoder, and personal video recorder

A video encoder comprising:

• a prediction unit for performing motion compensation of an input MPEG-2 video signal using reference picture information of a decoded MPEG-2 video signal and a motion vector of the reference picture, and outputting the motion-compensated video signal;
• a transform unit for transforming the motion-compensated video signal received from the prediction unit using an orthogonal-basis function, and quantizing the transform-resultant value;
• and
• an entropy coding unit for entropy-coding a video signal received from the transform unit.

A Personal Video Recorder (PVR) comprising:

• a first video decoder for decoding an input MPEG-2 video signal, calculating reference picture information of the MPEG-2 video signal and a motion vector of a reference picture, and outputting the calculated result;
• a first video encoder for encoding the decoded MPEG-2 video signal into a H.264 video signal using the motion vector and the reference picture information generated from the first video decoder;
• and
• a storage unit for storing the H.264 video signal generated from the first video encoder.

A video encoding method comprising the steps of:

• decoding a first video signal;
• storing reference picture information of a reference picture acquired from the first video signal and a motion vector of a macroblock associated with the reference picture;
• and
• encoding the decoded first video signal into a second video signal using the stored reference picture information and the stored motion vector.