US 7,613,381 B2 · Video data processing method and video data processing apparatus

Abstract

I-frames are extracted from a normal play stream in an extract section (12), coding parameters and control parameters, such as VBV delay, related to a decoder buffer are modified for trick play in an I-frame picture data conversion processor (15), repeat pictures that display the same image content as the I-frames are generated and added following the I-frames in a repeat picture adder (16), and the transfer rate is controlled in a picture data size controller (17). This solves the problem that when trick play is executed between a server and a terminal on a network, if only I-frames are used the necessary network bandwidth may increase, a buffer may fail in the decoder that reproduces the trick play stream, and the reproduced video image may be disrupted.

Claims10

Dependent claims

A video data processing method that generates a trick play stream with an altered reproducing speed and reproducing direction from a video stream coded using frame-to-frame prediction, comprising:

a step of selectively extracting intra-frame coded pictures from the video stream, conforming to the speed and direction of the trick play stream to be reproduced;
an analysis step of analyzing a coding parameter of the extracted intra-frame coded pictures;
a modification step of modifying the coding parameter according to said speed and direction;
and
a generating step of generating the trick play stream by generating repeat pictures displaying content identical to the extracted intra-frame coded pictures and adding the repeat pictures following the intra-frame coded pictures with the modified coding parameter, the intra-frame coded pictures with the modified coding parameter being selected in their order of data transfer according to said reproducing speed and reproducing direction.

2 more elements

A video data processing apparatus that generates a trick play stream with an altered reproducing speed and reproducing direction from a video stream coded using frame-to-frame prediction, comprising:

means for selectively extracting intra-frame coded pictures from the video stream, conforming to the speed and direction of the trick play stream to be reproduced;
analysis means for analyzing a coding parameter of the extracted intra-frame coded pictures;
modification means for modifying the coding parameter according to said speed and direction;
and
generating means for generating the trick play stream by generating repeat pictures displaying content identical to the extracted intra-frame coded pictures and adding the repeat pictures following the intra-frame coded pictures with the modified coding parameter, the intra-frame coded pictures with the modified coding parameter being selected in their order of data transfer according to said reproducing speed and reproducing direction.

2 more elements

Dependencies are inferred from the claim text.

Video data processing method and video data processing apparatus

Life of this patent

Video data processing method and video data processing apparatus

Life of this patent

Abstract

Claims10