Decoding apparatus for encoded video signals

摘要

The present invention is a decoding apparatus for decoding an encoded video signal capable of displaying a secondary video synchronously with a primary video. The decoding apparatus includes: an auxiliary information analyzing part that analyzes auxiliary information including display auxiliary information about a display position and/or a display size of the secondary video, and applied time information by which the display auxiliary information is applied; a reference time counter that indicates a reference time at which a video is decoded and displayed; a comparing part that compares the applied time information with the reference time counter; a display screen forming part that uses a primary video and a secondary video to form a display screen; and a control part that controls the display screen forming part, wherein the control part controls the display position and/or the display size of the secondary video by affording a command to the display screen forming part using the display auxiliary information, based on an output result of the comparing part.

主权项

1. An information reproducing method which reproduces information based on an encoded video signal of a primary video, an encoded video signal of a secondary video, and auxiliary information which includes display auxiliary information about a display position of the secondary video and applied start time information which indicates a start timing at which the display auxiliary information is applied, the method comprising the steps of:
decoding the encoded video signal of the primary video read out from a recording medium, and the encoded video signal of the secondary video read out from a local storage; extracting the display auxiliary information and the applied start time information from the auxiliary information, the auxiliary information being read out from the local storage; and outputting the secondary video based on the applied start time information and reference time information at which the primary video is reproduced, while outputting the primary video, wherein: the secondary video is output while being superimposed on the primary video; when the applied start time information matches the reference time information, application of the display auxiliary information is started, and the display position of the decoded secondary video is controlled based on the display auxiliary information; the encoded video signal of the secondary video and the auxiliary information are downloaded via a network to the local storage; no auxiliary information is included in a stream of the encoded video signal of the secondary video in the local storage; and control of the display position is implemented by a processor which executes software programs, and a part of the auxiliary information is provided to the processor as a command of a JAVA language.