KR19980039218A - Fast forward and fast rewind method of video pump - Google Patents

Abstract

The present invention relates to a method for processing fast playback and reverse playback of a video pump, comprising: a first step of generating an index of a sequence header for fast and reverse playback from an original file; A second step of receiving, a third step of calculating a movement criterion using the fast playback and reverse playback times received in the second step, and whether the request received in the second step is a fast playback or a reverse playback. A fourth step of checking, a fifth step of searching for a start position for performing fast or reverse play as a result of the fourth step, and a sixth step of starting simple play at the position found in the fifth step.

The present invention realizes fast playback and reverse playback using only original files, which can be realized by a simple processing method, and is economical since a separate disk area is not required.

Description

How to Fast Forward and Fast Rewind a Video Pump.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fast fonvard and fast rewind method of a video pump, and a conventional method for producing visual effects such as fast playback and reverse playback constitutes a separate file. In other words, two files are required for fast playback and reverse playback in addition to the original files.

In the case of a movie of about 2 hours, for example, in addition to the 8Gbyte original file disk area, an additional disk area of 40-50% is required for fast and reverse playback, which requires a considerable amount of disk area.

In the present invention, in order to minimize the consumption of the disk area as described above, during fast playback and reverse playback, the index is generated by searching for a sequence header existing in the MPEG-2 transport stream in advance, The present invention provides a method of effecting fast, reverse playback by skipping a predetermined section based on the index and performing normal playback.

1 is a configuration diagram of a video pump,

2 is a flowchart of a method of fast playback and reverse playback according to an embodiment of the present invention;

3 is a flowchart illustrating a sequence header index generation process according to an embodiment of the present invention.

According to an embodiment of the present invention, a method of fast playing and reverse playing of a video pump includes a first step of generating an index of a sequence header for fast playing and reverse playing from an original file, and a second receiving fast play and reverse playing request from a client. And a third step of calculating a moving criterion using the fast playback and reverse playback times received in the second step; and a fourth step of checking whether the request received in the second step is fast playback or reverse playback. And a fifth step of searching for a start position for performing fast or reverse playback as a result of the fourth step, and a sixth step of starting simple playback at the position found in the fifth step.

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

1 is a configuration diagram of a video pump, FIG. 2 is a flowchart of a fast playback and reverse playback processing method according to an embodiment of the present invention, and FIG. 3 is a flowchart of a sequence header index generation process according to an embodiment of the present invention.

Referring to FIG. 1, a video pump is connected to a client 16 by an ATM network 15, which stores a MPEG-2 transport stream and a disk 14 in association with the disk 14. Disk input / output processing unit 13 for input / output processing, a system control device 12 for outputting a control signal, and an ATM network connection processing unit 11 for managing a connection with the ATM network.

The operation of the video pump having the above configuration is started at the request of the client 16, and the disk input / output device 13 is stored in the disk 14 under the control of the system control device 12. After reading the two transport streams and delivering them to the ATM network access processing unit 11, the ATM network access processing unit 11 transmits the MPEG-2 transport stream to the client 16 via the ATM network 15.

Referring to Figure 2, it can be seen that the fast regeneration and reverse regeneration processing method in the disk pump according to an embodiment of the present invention.

First, a sequence header index for fast and reverse playback is generated 20 from an original file, a fast and reverse playback request is received from a client 30, and the fast and reverse playback time requested by the client is used. The movement offset is calculated (40).

At this time, the offset is calculated to move by 864,800 bytes per second according to the received playback time, and if you want to move 10 seconds, the offset value is 8,648,000.

When the offset is calculated as described above, a file pointer to start normal play is found, and first, whether the request received from the client is fast play or reverse play (50). Search for a pointer greater than 'current position + offset' in the sequence header index (60), and if it is reverse play, search (70) for a pointer less than 'current position + offset' in the sequence header index, and then perform the step (60 or Simple playback starts at the pointer position retrieved at 70) (80).

When the simple play is started after the start position is searched as described above, a result of moving by the required time can be achieved, thereby achieving the effect of fast play or reverse play.

Referring to FIG. 3, the steps of generating 20 a sequence header index for fast reproduction and reverse reproduction from an original file will be described in detail.

To create a sequence header index from the original file, first open the original file, initialize the pointer value to '0' (21), read one byte from the original file, and read a byte of 4 bytes to check the sequence header. The pointer is stored in the buffer, and the value of the pointer is increased by 1 every byte (22). When the size of the 4-byte buffer reaches 4, the content is examined 23 to determine whether the sequence header is a value (00 00 01B8) (24). If the result of the check (24) indicates that the value of the buffer content is the sequence header value (0x 00 00 01 B8), the start position (Pointer-4) is registered in the sequence header index (26), and the buffer is cleared for the next sequence header search. (Clear) and continue reading the next byte (22).

If the value of the buffer contents is not the sequence header value (0x 00 00 01 B8), the first byte of the buffer is removed and the second, third, and fourth bytes are moved to the first, second, and third bytes. Leave the last byte blank (25), then continue reading the next byte from the file (22).

By performing the fast and reverse play of the disk pump using the above method, it is possible to process only the original file (file for PLAY) without adding a separate disk for the fast play and reverse play process when providing the on-demand movie service.

Conventional disc pump fast play and reverse play techniques require separate disk areas for fast play and reverse play, and thus require additional disk areas, and require complicated processing. When the playback method is used, fast playback and reverse playback can be realized using only the original file, which can be realized by a simple processing method, and it is economical because a separate disk area is not required.

An object of the present invention is to provide a method for minimizing the use of a disk generated by generating and processing files for fast reproduction and reverse reproduction, respectively, in order to produce a visual effect in a video pump for processing an on-demand movie.

Claims (3)

A fast playback and reverse playback method of a video pump, comprising: a first step of generating an index of a sequence header for fast and reverse playback from an original file, a second step of receiving a fast and reverse playback request from a client; A third step of calculating a movement criterion using the fast playback and the reverse playback time received in the second step, a fourth step of checking whether the request received in the second step is a fast play or a reverse play; A fourth step of searching for a start position for performing fast playback or reverse playback, and a sixth step for starting simple playback at the position searched in the fifth step. Fast Forward and Fast Rewind Method. The method of claim 1, wherein the first step comprises opening an original file, initializing a pointer value to '0', and reading a byte from the original file and storing it in a four-byte buffer. The twelfth step of increasing the value of the pointer by '1', the thirteenth step of checking the contents when the size of the 4-byte buffer becomes four, and the contents checked in the thirteenth step is '00 00 01 B8 'If the 14th step of checking whether the check result and the result of the 14th step is not '00 00 01 B8', the first byte of the buffer is removed, and the 2nd, 3rd and 4th bytes are 1, 2, 3 A fifteenth step of moving to the first byte and a sixteenth step of registering a 'pointer-4' value in the sequence header index array and clearing the buffer if the result of the fourteenth step is '00 00 01 B8 ' Fast forward and reverse playback of a video pump, characterized in that ast Rewind) method. The method of claim 1, wherein the fifth step searches for a pointer larger than the 'current position + offset' in the sequence header index in the case of fast playback, and a pointer smaller than the 'current position + offset' in the sequence header index in the reverse playback. Fast Forward and Fast Rewind methods of a video pump characterized by searching.