Decoding apparatus for encoded video signals

A decoding apparatus that decodes an encoded video signal including a frame ID for uniquely identifying a frame in encoded information of the frame and decodes an encoded video signal capable of displaying a secondary video synchronously with a primary video, comprising:

• 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 frame ID information by which the display auxiliary information is applied;
• a frame ID analyzing part that analyzes the frame ID of a frame included in the encoded video signal;
• a comparing part that compares the applied frame ID information with the frame ID of the frame;
• 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.

A decoding apparatus comprising:

• a first input part to which a first encoded video signal is inputted;
• a second input part to which a second encoded video signal is inputted;
• a first decoding part that decodes the first encoded video signal;
• a second decoding part that decodes the second encoded video signal;
• an output part that outputs video signals decoded by the first and the second decoding parts to display them in a display part;
• and
• a control part that controls information about a display position and/or a display size for the display part, of the video signal decoded by the second decoding part,
• wherein the control part performs control so that the video signal decoded by the second decoding part is displayed synchronously with the video signal decoded by the first decoding part.