Method for encoding video information and method for decoding video information, and apparatus using same

A method for encoding video information, the method comprising:

• deriving prediction information from information of a neighboring block, wherein the neighboring block is one of spatial neighboring blocks and a temporal neighboring block;
• determining whether information of the current coding unit is the same as the prediction information;
• and
• encoding a prediction flag of the current coding unit based on the result of determination;
• wherein the information of the current coding unit includes information on a motion vector of the current coding unit and information on a prediction direction of the current coding unit,
• wherein the prediction information includes prediction information on a motion vector and prediction information on a prediction direction,
• wherein, when the prediction flag indicates the information of the current coding unit is the same as prediction information derived from information of the temporal neighboring block, a first reference index and a second reference index are determined to be a predetermined constant value based on whether two lists of reference frames are corresponded to the current coding unit,
• wherein the current coding unit is decoded based on a first frame and a second frame,
• wherein the first frame is determined by the first reference index and a first list of reference frames,
• wherein the second frame is determined by the second reference index and a second list of reference frames, and
• wherein the predetermined constant value is set before decoding the video information.

A non-transitory recording medium storing a bitstream generated by a method for encoding video information, the method comprising:

• deriving prediction information from information of a neighboring block, wherein the neighboring block is one of spatial neighboring blocks and a temporal neighboring block;
• determining whether information of the current coding unit is the same as the prediction information;
• and
• encoding a prediction flag of the current coding unit based on the result of determination;
• wherein the information of the current coding unit includes information on a motion vector of the current coding unit and information on a prediction direction of the current coding unit,
• wherein the prediction information includes prediction information on a motion vector and prediction information on a prediction direction,
• wherein, when the prediction flag indicates the information of the current coding unit is the same as prediction information derived from information of the temporal neighboring block, a first reference index and a second reference index are determined to be a predetermined constant value based on whether two lists of reference frames are corresponded to the current coding unit,
• wherein the current coding unit is decoded based on a first frame and a second frame,
• wherein the first frame is determined by the first reference index and a first list of reference frames,
• wherein the second frame is determined by the second reference index and a second list of reference frames, and
• wherein the predetermined constant value is set before decoding the video information.