Patent ID: 6912253

Claim:
A transcoding method for converting first coded data obtained from a plurality of frames forming a video image by means of a coding algorithms including an interframe prediction coding algorithm with motion compensation into second coded data having a different structure, the transcoding method characterized by comprising: an interframe prediction coded data re-editing step of taking a portion of frames which have had the interframe prediction coding and are included in the plurality of frames forming the video image as processing object frames, and from at least the first coded data corresponding to the processing object frames, generating the second coded data corresponding to coded data which are to be obtained when performing the interframe prediction coding on the processing object frames with reference to second reference frames which are different from first reference frames referenced in the interframe prediction coding of the processing object frames; said interframe prediction coded data re-editing step including a motion information calculating step of calculating motion information to be included in said second coded data using at least motion information contained in said processing object data.