KR100216512B1 - I-pictured video elementary stream file generation method of video pump - Google Patents

Abstract

The present invention provides a method for processing MPEG-4 for fast playback and reverse playback in a video pump that plays softening stored on a disc in the form of an MPEG-2 transport stream in various forms including simple play, fast play, and reverse play. The present invention relates to a method of generating a video elementary stream for fast playback and reverse playback by extracting only a still picture I-Picture from a video elementary stream. The present invention provides a method for constructing a separate file for fast playback and reverse playback. The present invention provides a method for constructing a video elementary stream having excellent image quality and visual effects. A method of extracting only a still picture and a method of constructing a video elementary stream for fast playback and reverse playback using the extracted still picture.

Description

How to create still image video elementary stream file in video pump

TECHNICAL FIELD The present invention relates to the fields of multimedia technology, video on demand, and MPEG-2 technology. In particular, the present invention relates to a simple play (play) to a plurality of clients of a movie stored on a disk in the form of an MPEG-2 transport stream, A video pump for reproducing in various forms including fast forward and fast rewind, the method of generating a still image video elementary stream file for processing fast replay called reverse playback. It is about.

In the prior art, the header search is performed for a plurality of times for the reproduction and the reverse reproduction.

Accordingly, in order to solve the above problem, the present invention generates a sequence header by generating an index array consisting of start and end when extracting an I-Picture that stores only still images. In order to shorten the time required to generate the GOP (Group Of Picture) header and the still picture header search at once.

1 is a block diagram of a video pump to which the present invention is applied.

2 is a flowchart of generating an I-Pictured video elementary stream file for fast forward and fast rewind processing of the present invention.

3 is a flowchart for generating an indexed array required for generating a still picture video elementary stream.

The still image video elementary stream file generation in the video pump of the present invention for achieving the above object is a video pump for reproducing the movie stored in the disc in the form of MPEG-2 video transport stream to a plurality of clients in various forms The first process of searching for an MPEG-2 video elementary stream file to generate an index array, the second process of generating a file for quick playback according to the contents of the searched index array, and the contents of the searched index array. According to the third step of generating a file for fast reverse playback.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a video pump.

As shown in FIG. 1, the video pump 30 processes the disk input / output device 33 under the control of the system controller 32 in processing the request of the client 20 connected to the ATM network 10. When the MPEG-2 transport stream stored in the 40 is read and transmitted to the ATM network access processing unit 31, the ATM network access processing unit 31 passes through the ATM network 10 to the client 20 MPEG-2 transport stream. Send it.

2 is a flowchart for generating a video elementary stream for fast playback and reverse playback of the present invention.

First, in order to generate a still picture video elementary stream for fast playback and reverse playback, a sequence header and a GOP header for generating a still picture video elementary stream by searching for a video elementary stream for play And an index array at the start / end of the still image (100).

In this case, a procedure for generating the sequence header, the GOP header, and the index image index array will be described in more detail with reference to FIG. 3.

First, the sequence header, the GOP header, and the start picture of the still picture are each composed of 4 bytes. The sequence header code is 00 00 01 B3, the GOP header code is 00 00 01 B8, and the still picture header code is 00 00 01 00. Has Accordingly, a 4-byte header buffer is used to retrieve the start code of each header, and the header buffer and the current position value are initialized for the position value to be input when the index array is generated (110).

Thereafter, 1 byte is read from the video elementary stream and stored in the buffer, and the value of the current position is increased by 1 (111).

Then, when the 4-byte buffer is full, the contents of 4 bytes are compared with the value of each header (112).

When the contents of the buffer are the sequence header code (00 00 01 B3) by the comparison, the start value is allocated to the current position-4 to include the sequence header value (113).

In addition, for the comparison, when the contents of the buffer are the GOP header code (00 00 01 B8), the previous position (current position-5) of the GOP header is allocated as the end value, and the new start value is assigned as the (current position -4). (114).

In addition, when the contents of the buffer are image header codes (00 00 01 00), the image type is checked to extract only still pictures (I-Picture) from I, P, and B pictures by the comparison (116).

(1: I-Picture, 2: B-Picture, 3: P-Picture).

When the picture type is a still picture (I-Pictured) by inspection of the picture type, an end value is assigned to (current position-5), and a new start value is assigned to (current position-4) (117). If it is not a still picture, in order to store only the still picture, an end value for the end of the still picture (I-Picture) is assigned to (current position-5) (118).

When the above process is completed, the assigned start and end values are registered in the index array (119), and the above process is repeated until the end of the video elementary stream file to continue generating the index array.

When generation of the index array is completed through the steps 110 to 119, the contents of the array from the beginning to the end of the array are sequentially stored in a new file according to the searched index contents to generate a fast elementary video elementary stream file ( 200).

Thereafter, according to the contents of the searched index array, the contents from the end to the beginning of the array are sequentially stored in a new file in order to generate a video elementary stream file for reverse playback (300).

The present invention is to generate a sequence header, the index array of the start / end of the header of the GOP header still picture, and to generate a video elementary stream file for fast and reverse playback using the generated array It can be applied when creating a video elementary stream file for fast playback and reverse playback.

Through the present invention as described above, it is possible to generate a video elementary stream file for fast playback and reverse playback when providing a movie service on demand in a video pump, and through this, a visual effect can be expected.

The present invention is to extract only the still picture (I-Pictured) that stores the still picture in the method for generating a file for fast playback and reverse playback respectively for a visual effect in a video pump for processing on-demand movies. There is a purpose.

Claims (9)

In a video pump for reproducing a movie stored on a disc in a MPEG-2 video transport stream to a plurality of clients in various forms, a first process of generating an index array by searching MPEG-2 video elementary stream files; And a third process of generating a file for quick playback according to the contents of the searched index array, and a third process of generating a file for fast reverse playback according to the contents of the searched index array. How to create a stream file. 2. The method of claim 1, wherein the first process uses a header buffer to retrieve a sequence header, a GOP (picture group) header, and a start code of a still picture, and includes a header buffer and a current for a position value to be input when generating an index array. A first step of initializing a value of a position, a second step of reading a predetermined data unit from the video elementary stream and storing it in the header buffer, and increasing the value of the current position by a predetermined number; A third step of comparing the filled contents with the values of the respective header codes, and a fourth step of allocating a start value to include the sequence header code values when the contents of the buffer are sequence header codes by the comparison; If the contents of the buffer is a GOP header code by the fifth step of assigning the potential value of the GOP header as the end value, and assigning a new start value by the comparison; If the content of the fur is a picture header code, a sixth step of checking a picture type to extract only a still picture that is an I picture among I pictures, B pictures, and P pictures; and assigning an end value if the picture type is a still picture. A seventh step of allocating a new start value, an eighth step of allocating an end value for the end of the still picture to store only the still picture if the picture type is not a still picture, and the assigned start and end values And a tenth step of continuing to generate the index array by repeating the above steps until the end of the video elementary stream file is registered in the index array. The method of claim 2, wherein the second step reads the data by 4 bytes and increments the current position value by one. The method of claim 2, wherein the fourth step assigns a start value to a value obtained by decreasing a value from 4 at a current position. 3. The still picture video element according to claim 2, wherein the fifth step assigns the end value to a value of 5 at a current position and a new start value to a value of 4 at a current position. How to create a stream file. 3. The still picture video element according to claim 2, wherein the seventh step assigns an end value to a value of 5 at the current position and a new start value to be assigned to a value of 4 at the current position. How to create a stream file. 3. The method of claim 2, wherein the eighth step assigns an end value to a value obtained by decreasing a five from the current position. The method of claim 1, wherein the second process stores the contents from the beginning to the end of the index array in order in a new file. The method of claim 1, wherein the third process stores the contents from the end of the index array to the beginning in reverse order in a new file.