KR20070096406A - Method for controlling trick play of digital multimedia file - Google Patents

Abstract

A method for controlling trick play of a digital multimedia file is provided to overlap a subtitle image on a video image played at double or quadruple play speed. A method for controlling trick play of a digital multimedia file includes a step of storing a time stamp of a video by synchronously playing an audio, the video, and a subtitle(S11), and a step of performing trick play by connecting video data with subtitle data mutually by searching the stored time stamp of the video when trick play of the digital multimedia file is requested(S16,S17,S18). The time stamp of the video is stored in a non-volatile memory with an ID(identification) of the digital multimedia file.

Description

Variable speed playback control method of digital multimedia file {Method for controlling trick play of digital multimedia file}

1 illustrates a configuration of a digital multimedia apparatus to which the present invention is applied.

2 illustrates an embodiment in which a video time stamp of a Divix file to which the present invention is applied is stored and managed in a memory.

3 is a flowchart illustrating a method for controlling shift reproduction of a digital multimedia file according to the present invention;

4 illustrates an embodiment in which a video and a subtitle of a DivX file to which the present invention is applied are shifted and reproduced.

※ Explanation of code for main part of drawing

10: optical disc 11: optical pickup

12: VDP system 13: hard disk

14: HDR system 15: decoder

16: microcomputer 17: OSD generation unit

18: memory

The present invention relates to a variable playback control method of a digital multimedia file. For example, when performing a trick play operation on a digital multimedia file such as a Divix file, the video data and the subtitle data are interconnected. The present invention relates to a variable speed reproduction control method of a digital multimedia file for shift speed reproduction.

Recently, various types of digital multimedia files have been widely used and used. For example, the DIVX file distributed through the Internet is an MPEG-4 codec developed exclusively for streaming by Microsoft. (Codec) is a file created so that it can be used freely. It refers to a video file that has been manipulated and modified by MPEG-4, which was developed in 1999 by Microsoft in order to provide real-time voice, video, and animation on the Internet.

On the other hand, such a Divix file is composed of an audio and video file (A / V File) and a subtitle file (Subtitle File), for example, the subtitle file is edited into subtitle files of various languages And, in the case of playing a DivX file stored in a storage such as an optical disk or a hard disk in a digital multimedia device, the subtitle file included in the DivX file is selectively read and downloaded to a memory.

Subtitle files of the subtitle data are interconnected with audio and video data of the audio and video data by interplaying and reproducing the subtitle file downloaded to the memory while reading and playing the audio and video files configured in the Divix file in real time. To be displayed.

However, in the case of performing a play play of the DivX file, for example, when performing a play speed change operation such as 2 times speed or 4 times speed, the video data recorded in the audio and video files is applied. Since the video is intermittently searched and reproduced at double speed, subtitle data recorded in a file different from the video data cannot be synchronized and reproduced, so that the subtitle video of the subtitle is superimposed and displayed on the video image to be shifted and reproduced. There is a problem that cannot be done.

Therefore, the present invention was created to solve the above problems, and for example, before performing a play play operation on a digital multimedia file such as a DivX file (DIVX), a time stamp of video data. (Time Stamp) is stored in advance in a nonvolatile memory in the device, and then synchronized with a time stamp of subtitle data recorded in a file different from audio and video data, so that the video data and subtitle data can be shifted and reproduced together. An object of the present invention is to provide a method of controlling reproduction of a digital multimedia file.

In order to achieve the above object, the variable playback control method of a digital multimedia file according to the present invention may be performed by synchronizing audio, video, and subtitles while playing a digital multimedia file. Storing in the device; And performing a shift playback operation by retrieving the time stamp of the video stored in the device by interlocking the video data and the subtitle data when the shift playback operation of the digital multimedia file is requested. Features,

In addition, the digital multimedia file is a DivX (DIVX) file consisting of an audio and video file and a subtitle file, and the time stamp of the video is stored in a nonvolatile memory together with the ID of the digital multimedia file. When the playback of the multimedia file is requested, the method further comprises the step of scanning the time stamp of the video at a high speed for a predetermined time, and pre-stored in the non-volatile memory,

In addition, if the time stamp of the video is stored in the nonvolatile memory together with the ID of the digital multimedia file to be reproduced, the operation of rapidly scanning the time stamp of the video for a predetermined time is omitted.

Hereinafter, a preferred embodiment of a method for controlling shift reproduction of a digital multimedia file according to the present invention will be described in detail with reference to the accompanying drawings.

First, the variable playback control method of the digital multimedia file according to the present invention can be applied to various types of digital multimedia devices. For example, as shown in FIG. 1, the digital multimedia device includes an optical disc 10. , Optical pickup 11, VDP (Video Disc Play) system 12, hard disk 13, HDR (HDD Record) system, decoder 15, microcomputer 16, OSD generator 17, and Memory 18 and the like.

On the other hand, the microcomputer 16, in response to the user's request, the operation of the OS generating unit 17, the file list (File List) to enable the user to selectively play any desired digital multimedia file (File List) The menu screen of the output is displayed as an OS video capable of a user interface.

When an arbitrary digital multimedia file is selected and designated through the menu screen of the OS video, the microcomputer 16 operates and controls the VDP system 12 or the HDR system 14 so that the user desires digital. Select and play a multimedia file.

For example, when a user selects a first Divix file (DVIX File # 1) recorded on the optical disc 10 and requests a playback operation, the microcomputer 16 controls the VDP system 12. And a series of subs which read the subtitle file among the audio and video files (A / V file) and the subtitle file included in the first DivX file and store them in the memory 18. The title file download operation is performed.

In addition, in the microcomputer 16, as shown in FIG. 2, the VDP system 12 is operated to control the time stamp of the video recorded in the audio and video files (Video / Time Stamp). For example, a presentation time stamp (PTS), which determines a playback time of video data, is scanned at a high speed for a predetermined time and stored in the memory 18.

On the other hand, the video time stamp is stored in association with a unique ID (DVIX File # 1_ID) that can identify the first Divix file, for example, the memory 18, such as a flash (Flash) memory, etc. Volatile memory is used, and the microcomputer 16 determines that the ID of the DivX file requested to be reproduced by the user is a DivX file that has been played before, if already stored in the memory 18.

As described above, the playback operation is immediately performed while a series of operations of scanning and storing a time stamp of a video at a high speed for a predetermined time is omitted. In this case, the VDP system 12 performs the audio operation. And the audio and video data recorded in the video file and the subtitle data recorded in the subtitle file are linked based on respective time stamps so that the subtitle characters of the subtitle data are combined with the audio and video data of the audio and video data. Correlate with and display playback.

In addition, the microcomputer 16 controls the VDP system 12 when the user requests a trickle play such as 2x speed or 4x speed while performing the normal playback operation as described above. In this case, the variable speed reproduction operation of the double speed is performed. In this case, in the VDP system 12, video data (for example, an I-picture) recorded in the audio and video file is arranged at predetermined intervals corresponding to the double speed. Search.

The subtitle data synchronized with the video data is searched and reproduced. In this case, the subtitle data is searched and read based on a time stamp of a video previously stored in the memory 18, and thus the searched and reproduced in real time. Video data and subtitle data recorded in other files can be interconnected and reproduced, which will be described in more detail as follows.

3 is a flowchart illustrating a method for controlling shift reproduction of a digital multimedia file according to the present invention. For example, as described above with reference to FIG. 2, an audio and video file (A / V file) and a sub serve are described. If a playback mode is set for a DivX file composed of a title file (Subtitle File) (S10), the microcomputer 16 operates the VDP system 12 to read the subtitle file, and then reads the memory. A series of subtitle file download operations to be stored in 18 are performed (S11).

Then, the ID (ID) of the DivX file is searched and confirmed. For example, the ID (DVIX File # 1_ID) of the first DivX file requested for reproduction by the user is not stored in the memory 18. Otherwise, after determining that it is the first play (1st Play) (S12), the time stamp of the video data recorded in the audio and video file of the first DivX file is scanned at a high speed for a predetermined time (S13), and the memory 18 In this case, the time stamp of the video is stored together with the ID of the first DivX file (S14).

On the other hand, after storing the time stamp of the video for a predetermined time as described above, the microcomputer 16 operates the VDP system 12 to control audio and video data of the first DivX file and subtitle data. A general playback operation for performing cooperative playback is performed, and the time stamp of the video read by the normal playback operation is continuously accumulated and stored in the memory 18 (S15).

When the user requests a shift regeneration operation such as double speed or quadruple speed (S16) while performing the normal regeneration operation as described above (S16), the microcomputer 16 operates to control the VDP system 12. The video data recorded in the audio and video files (eg, I-pictures) is searched and reproduced at predetermined intervals corresponding to the corresponding double speed. In the VDP system 12, the memory 18 is stored in the memory 18. The time stamp of the pre-stored video is retrieved (S17), and the video data to be searched and reproduced in real time and the subtitle data recorded in another file are interconnected and reproduced (S18).

For example, as shown in FIG. 4, the VDP system 12 sequentially synchronizes audio and video data recorded in the audio and video files and subtitle data recorded in the subtitle file. If a variable speed playback operation such as 2x speed or 4x speed is performed while the normal play operation is performed, the video data (eg, I-picture) is jumped at a predetermined interval corresponding to the corresponding speed speed. ) Intermittently.

Then, the time stamp of the video stored in advance in the memory 18 is searched, and the subtitle data associated with the intermittently searched video data is quickly searched and read, thereby intermittently searching the video data and the video data. By synchronizing the subtitle data to be synchronized with each other, the caption image is superimposed on the video image to be shifted and reproduced.

On the other hand, in the microcomputer 16, if the shift reproduction operation is stopped in response to the user's request (S19), the shift reproduction operation is stopped as described above, and then the corresponding operation requested by the user is performed (S20). .

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

In the variable speed reproduction control method of the digital multimedia file according to the present invention as described above, for example, when performing a reproduction operation of a digital multimedia file, such as a Divix file, while synchronizing audio, video, and subtitles, After a time stamp of the video is stored in a nonvolatile memory in the device, and a request for a trick play operation such as 2 times or 4 times speed is requested, a time stamp of the video stored in the nonvolatile memory is requested. And by performing the shift playback operation by linking the time stamps of the subtitles, it is possible to perform the shift playback by synchronizing the subtitle data recorded in the file different from the video data with the video data. Efficiently superimpose subtitles of subtitles on video images that are shifted and reproduced at 4x speed, etc. It can be very useful inventions that allow.

Claims (5)

A step of storing a time stamp of the video in the device while playing the audio, video, and subtitle in synchronization with the digital multimedia file; And And performing a shift playback operation by retrieving a time stamp of the video stored in the device by interlocking the video data and the subtitle data when the shift playback operation of the digital multimedia file is requested. A variable playback control method of a digital multimedia file. The method of claim 1, And the digital multimedia file is a DivX (DIVX) file consisting of an audio and video file and a subtitle file. The method of claim 1, And the time stamp of the video is stored in a nonvolatile memory along with the ID of the digital multimedia file. The method of claim 1, When the digital multimedia file is requested to play, the method further comprises the step of scanning the time stamp of the video at a high speed for a predetermined time, and pre-stored in the non-volatile memory. The method of claim 4, wherein If the time stamp of the video is stored in the nonvolatile memory together with the ID of the digital multimedia file to be reproduced, the variable speed reproduction of the digital multimedia file is omitted. Control method.

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