JPH09266562A - Mpeg file pseudo editing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the display of an edited dynamic image by successively reproducing respective MPEG files just by a regenerative length from a reproduction starting position according to the index of a virtual MPEG file. SOLUTION: A virtual MPEG reproducing device 103 successively refers to the respective entries of an index 107 composed of an arrayed list from the top and repeats the reproducing processing of a real MPEG file 109 just by the number of entries. First of all, an initial value '1' is substituted for a parameter (i) showing a reference line of a list and the number of lines in the list is defined as (n). Next, a file name file1 of the real MPEG file 109 described in the i-th line, reproduction starting position from1 t and reproduction ending position to1 are read out of the list of the index 107. Afterwards, instruction is given to an MPEG decoder 108 to reproduce the partial dynamic images of the real MPEG file 109 file1 from the reproduction starting position from1 to the reproduction ending position to1 onto a display device 110, and these images are successively continuously reproduced while adding '1' to (i).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an MPEG file pseudo-editing system for pseudo-editing an MPEG file, and in particular, it deletes useless moving image parts and encodes other moving image files. The present invention relates to a technique effectively applied to an MPEG file pseudo-editing system that inserts / overwrites in an arbitrary part and artificially generates and edits a shaped new moving image.

[0002]

2. Description of the Related Art At present, the MPEG format has become a standard for moving picture formats on computers, and moving pictures on computers are generally represented by sequentially displaying "frames" of still images on a screen. .

In the MPEG format, in order to enable random access, each frame is added with a "time stamp" indicating the time at which the frame should be reproduced.

Further, in the MPEG format, in order to improve the compression efficiency of a moving image, it can be realized only by compressing information within a frame.
Three types of frames are used: a frame, a P frame that represents the current screen as a difference value from the previous screen, and a B frame that represents the current screen as a difference value from previous and subsequent screens.

In particular, in the B frame, the front and rear screens must be decoded first, and the decoding process must be performed based on the two screens. Therefore, the arrangement of each frame on the display and the arrangement on the file. Are generally not in agreement.

For this reason, in order to edit the MPEG file itself, it is necessary to re-attach the time stamps to the entire file in order to allow random access to the edited file.

As described above, it has been difficult to realize the editing of the MPEG file itself because the internal structure of the MPEG file is complicated.
It was done by using a product called "VIDEO CLIP MPEG" of EC company.

[0008]

In the above products, when the MPEG file to be edited for setting the time stamp appropriately is read, the internal analysis is performed, but this takes a lot of time. ing.

Further, it takes time to generate a new edited file, and there is no problem when handling a file having a moving image length of several minutes, but the size of the file to be edited is large. However, there is a problem that it takes a long time to edit in proportion to, and it cannot be practically used for the purpose of editing a large moving image of several ten minutes to several hours which is generally performed using a video tape or the like.

An object of the present invention is to provide a technique capable of editing an MPEG file in a short time.

[0011]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

In this MPEG file pseudo editing system, a virtual MPEG file is generated and simulated in place of directly performing editing such as deletion or insertion of a partial moving image in the MPEG format file on the MPEG file. Partial virtual images in which the MPEG files are partially taken out are arranged in the order of reproduction, and indexes of the virtual MPEG files for storing information on the take-out positions of the respective partial moving images,
Based on the position information of the partial moving image of the index, the M
A means for extracting and displaying the partial moving image from the PEG file and a means for rewriting the position information of the partial moving image in the index and performing editing such as deletion and insertion of the virtual MPEG moving image are provided.

[0013]

1 is a diagram showing the configuration of an MPEG file pseudo-editing system according to an embodiment of the present invention.

The MPEG pseudo-editing system 100 of this embodiment shown in FIG. 1 has an actual MPEG file 109.
(Hereinafter, referred to as a real MPEG file) is used to generate a virtually edited MPEG file (hereinafter referred to as a virtual MPEG file) that the user wants to play, and the created virtual MPEG file is played back. By doing so, the MPEG file is pseudo-edited without directly editing the actual MPEG file 109.

As shown in FIG. 1, the MPEG of the present embodiment.
The pseudo-editing system 100 receives input from the user,
A command input device 101 for inputting an edit command for the virtual MPEG file, such as deletion of a specified section of the virtual MPEG file, insertion of the real MPEG file 109 into the virtual MPEG file, and overwriting, and a command input from the command input device 101 will be described later. Virtual M
PEG playback device 103 and virtual MPEG deletion device 104
, A command device 102 that calls the virtual MPEG insertion device 105 and the virtual MPEG overwrite device 106, an index 107 that stores the structure of the virtual MPEG file, and the file name of the real MPEG file 109 to be played and its playback start Position, playback end position index 1
07, a virtual MPEG playback device 103 for playing back the MPEG decoder described later, and a virtual MPEG deletion device for appropriately rewriting the desk 107 according to a virtual MPEG editing command input by the user to edit the virtual MPEG file. 104, virtual MPEG
Insertion device 105 and virtual MPEG overwrite device 106
And the actual MPE passed from the virtual MPEG playback device 103.
The main body of the file corresponding to the file name of the G file 109 is extracted, decoded from the reproduction start position passed from the virtual MPEG reproduction device 103 to the reproduction end position, and the moving image is passed to the display device 110. The display device 110 displays the passed moving image.

In the present embodiment, the commands input by the user are a playback command for the virtual MPEG file, a deletion command for designating a deletion end position from the deletion start position and deleting the moving image between them, and a virtual MPEG file. There are an insert command for inserting the real MPEG file 109 at the designated position of the file and an overwrite command for overwriting the real MPEG file 109 from the designated position of the virtual MPEG file.

Further, the virtual MPEG overwrite device 106 is
As shown in FIG. 1, since the virtual MPEG file is deleted and inserted, the virtual MPEG deletion device 104 and the virtual M file are deleted.
It is configured to call the PEG insertion device 105.

FIG. 2 is a diagram showing the structure of the index 107 described above. As shown in FIG. 2, the index 107 is shown in a data structure using a list of arrays, which represents one virtual MPEG file.

An arbitrary entry (row) in the list of the index 107 represents a partial moving image of the real MPEG file 109. For example, the entry i shown in FIG.
The actual MPEG file 10 to be reproduced by the G decoder 108
A file name file _{i of} 9, a reproduction start position from _i in the file, and a reproduction end position to _i are stored.

Next, the operation of the virtual MPEG playback apparatus 103 using the index 107 of FIG. 2 described above will be described with reference to FIG.
This will be described based on FIG.

FIG. 3 is a flowchart showing the flow of operation of the virtual MPEG playback device 103.

The virtual MPEG playback device 103 refers to each entry of the index 107 composed of the array-based list in order from the top, and repeats the playback processing of the real MPEG file 109 by the number of entries.

In the operation of the virtual MPEG playback apparatus 103, first, the initial value 1 is substituted into the variable i indicating the reference row of the list, and the number of rows in the list is set to n (step 301).

Then, from the list of index 107,
The file name file _i , the reproduction start position from _i , and the reproduction end position to _i of the actual MPEG file 109 described in the i-th line are read (step 302).

After that, a command is issued to the MPEG decoder 108 so that the partial moving image from the reproduction start position from _i to the reproduction end position to _i of the actual MPEG file 109file _i is reproduced by the display device 110 (step 30).
3).

Then, 1 is added to i, and if i is n or less, the process returns to step 302 and the next real MPEG file 109
Is reproduced by the display device 110.

Otherwise, all real MPs in the list
Since the EG file 109 has been reproduced, the process ends (step 305).

In this way, the actual MPEG file 10
By reproducing a part of 9 successively, the user can see a continuous moving image similar to the reproduction of a single MPEG file.

Next, the procedure for deleting the virtual MPEG file performed by the virtual MPEG deleting apparatus 104 of this embodiment will be described.

FIG. 4 is a flowchart showing a procedure for deleting a virtual MPEG file.

Deletion of the virtual MPEG file deletion device 104 is first started by a deletion command having two parameters, FROM and TO, which indicate from which position of the virtual MPEG file the deletion is performed (step 4).
01).

This parameter FROM and TO are FROM
<If TO is satisfied, the process proceeds to step 403, and if not satisfied, it is considered that all are deleted and the process ends (step 402).

After that, the pointer i which refers to the index 107 is set to 1 representing the first entry (step 403).

If the sum of the lengths of moving images from the set entry 1 to entry i (obtained by subtracting the playback start position from the playback end position described in the entry) is smaller than FROM, entry i is Virtual MPEG
Since the position FROM in the file is not included, step 4
If not, go to step 406 (step 404).

At step 405, 1 is added to i and the process returns to step 404.

In step 406, the deletion start position from in the entry including FROM is subtracted from the sum of the lengths of the moving images from entry 1 to entry i-1 from FROM, and the reproduction start position from _i of the current entry is calculated. Is calculated by adding, and the deletion start position to is added to the from calculated in step 406. The deletion length (TO-FROM)
Is added (step 407), the moving image managed by the entry cannot be deleted beyond its reproduction end position. Therefore, if to is larger than to _i (step 408), the reproduction end position of the entry is set. to _i (step 409).

When the deletion section matches the reproduction section of the entry (from = from _i and to = to _i ), when deleting from the beginning to the middle of the entry (from = f
rom _i and to <to _i ) and deleting from the middle of the entry to the end (from> from _i and
to = to _i ), the process branches to the case of deleting the entry from the middle to the middle (from> from _i and to <to _i ) (step 410).

When the deletion section matches the reproduction section of the entry (from = from _i and to = to _i ), the entry i is simply deleted (step 411), and the entry from the beginning to the middle is deleted. (From = f
rom _i and to <to _i ), since the section remaining after deletion is between to and to _i , the reproduction start position fr
When changing om _i to to (step 412) and deleting from the middle to the end of the entry (from> from)
_i and to = to _i ), the section remaining after deletion is fr
It is between om _i and from, and the reproduction end position to _i
To from (step 413) and delete from the middle of the entry to the middle (from> from _i)
And to <to _i ), the section remaining after deletion is fr
a two parts of the-to _i from m _i from from parts and-to, insert the new entry i + 1 immediately after the entry i (step 414), the entry of two sections which are separated by the deletion i and entry i + 1 described, MPEG file name of the entry i + 1, which represents the of the rear section sets the file _i to file _{i + 1} because the same as that of the entry i, a to _i to to to from _{i + 1} to to _{i + 1} each set (step 415), the entry i sets the from the-to _i exhibits a front section (step 4
16).

The files _i and from _i inherit the unprocessed ones as they are.

Then, the length of the moving image actually deleted by the deletion process in the entry is represented by to-from, and the actual deletion length is added to FROM, and step 402 is executed.
Return to

Next, a procedure for inserting a virtual MPEG file performed by the virtual MPEG inserting apparatus 105 will be described.

FIG. 5 is a flow chart showing the procedure for inserting a virtual MPEG file.

Insertion of a virtual MPEG file is performed by a virtual MP
P indicating which position in the EG file the actual MPEG file 109 is inserted, the name of the actual MPEG file 109 to be inserted in the virtual MPEG file, and its file.
It is started by an insert command with parameters from and to which indicate from which position of e to which position the partial moving image is to be inserted (step 501), and the pointer i that refers to the index 107 indicates the first entry 1 Is set (step 502).

If the sum of the lengths of the moving images from the set entry 1 to entry i is smaller than P, entry i does not include the position on the virtual MPEG file, so the process proceeds to step 504. If not, the process proceeds to step 505 (step 503).

At step 504, 1 is added to i and the process returns to step 404.

In step 505, the insertion position p in the virtual MPEG file is converted into the position p in the real MPEG file 109 managed by the entry, and the deletion start position p in the entry including P is changed from entry 1 to entry 1. i
It is obtained by adding the reproduction start position from _i of the current entry to the value obtained by subtracting the sum of the lengths of moving images up to -1 from P.

Here, if p = from _i , it is found that the insertion position is at the boundary between the entry and the entry immediately preceding it, and the process proceeds to step 507. If not, the insertion position is in the middle of the moving image portion represented by the current entry. There is, so step 5
The process proceeds to 09 (step 506).

At step 507, a new entry i-1 is inserted immediately before the entry i.

Then, the MPEG of the new entry i-1
The file name file _i-1 is set as a file, and the reproduction start position from _i-1 and the reproduction end position to _i-1 are respectively set to from.
Then, the insertion process is completed (step 508).

In step 509, new entries i + 1 and i + 2 are inserted after the entry i, the first half and the second half of the original entry divided by the entries i and i + 2 are described, and a new MPEG file is created in the entry i + 1. Describe.

After that, the latter half of the entry i divided by P is described in the entry i + 2, and the MPEG file name f
Since ile _{i + 2} is the same as the file name of the entry before division, set file _i to this, and the playback section is from p to to _i of the entry before division, and the playback start position from _{i + 2} , playback P, to the end position to _{i + 2} respectively
_i is set (step 510).

Subsequently, the first half part is described in the entry i,
Since the MPEG file name and the reproduction start position are the same as those before the division, they are inherited as they are, and the reproduction end position is shortened to p, so p is set to to _i (step 511).

Finally, the new MPEG file is described in the entry i + 1, the command parameter file is set in the file _i-1 of the MPEG file as in step 508, and the reproduction start position from _i-1 and the reproduction end position to
From and to are set to _{i + 1} , respectively, and the insertion process ends.

Next, the virtual MPEG file overwrite procedure performed by the virtual MPEG overwrite device 106 will be described.

FIG. 6 is a flowchart showing the procedure for overwriting a virtual MPEG file.

The virtual MPEG file is overwritten by the virtual M
From which position in the PEG file the actual MPEG file 10
9 with P, the actual MPEG file 109 name file to be overwritten on the virtual MPEG file, and from and to parameters indicating from which position of the file to which partial moving image is overwritten. Is started by the overwriting command (step 601), the section from the position P to P + (to-from) on the virtual MPEG file is deleted by the above-mentioned virtual MPEG deleting apparatus 104 (step 602), and the above-mentioned virtual MPEG is deleted. The inserting device 105 inserts the section from "from" to "to" of the actual MPEG file 109file at the position P on the virtual MPEG file, and the overwrite process ends (step 6).
02).

Therefore, as described above, MPE
Editing such as partial deletion or insertion of a moving image in a G format file is not directly performed on the MPEG file, but a virtual M
An imaginary MPEG file pseudo-editing system for generating a PEG file and arranging the partial moving images in which the MPEG files are partially taken out in the order of reproduction, and storing a virtual position of each partial moving image. MPEG
A means for extracting and displaying a partial moving image from an MPEG file based on the index of the file and the position information of the partial moving image of the index, and rewriting the position information of the partial moving image of the index to delete the virtual moving image of MPEG. , A virtual MP
By editing each MPEG file in order according to the index of the EG file, from the playback start position by the playback length, the edited moving image can be displayed, and the moving image can be partially deleted. Or another MPEG
By implementing an editing operation such as inserting or overwriting a file in a moving image by appropriately rewriting the index, it is not necessary to analyze or rewrite the MPEG file itself, so that the MPEG file can be edited in a short time. It will be possible.

As described above, the invention made by the present inventor is:
Although specifically described based on the embodiment, the present invention
It is needless to say that the present invention is not limited to the above embodiment, and various changes can be made without departing from the scope of the invention.

[0059]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows. By editing each MPEG file in order according to the index of the virtual MPEG file from the reproduction start position by the reproduction length, the edited moving image can be displayed, and a partial moving image can be displayed. It is not necessary to analyze or rewrite the MPEG file itself by implementing appropriate editing operations such as automatic deletion and insertion or overwriting of another MPEG file in the moving image, thus shortening the MPEG file. It will be possible to edit in time.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an MPEG file pseudo editing system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an index 107.

FIG. 3 is a flowchart showing a flow of operations of the virtual MPEG playback device 103.

FIG. 4 is a flowchart showing a procedure for deleting a virtual MPEG file.

FIG. 5 is a flowchart showing a procedure for inserting a virtual MPEG file.

FIG. 6 is a flowchart showing a procedure for overwriting a virtual MPEG file.

[Explanation of symbols]

100 ... MPEG pseudo-editing system, 101 ... Command input device, 102 ... Command device, 103 ... Virtual MPE
G playback device, 104 ... Virtual MPEG deletion device, 105 ...
Virtual MPEG insertion device, 106 ... Virtual MPEG overwrite device, 107 ... Index, 108 ... MPEG decoder,
109 ... Real MPEG file, 110 ... Display device.

Claims (1)

[Claims] 1. A pseudo-editing system for an MPEG file, which does not directly edit or delete a partial moving image in an MPEG format file but creates a virtual MPEG file to simulate it. The partial moving images in which the MPEG files are partially taken out are arranged in the order of reproduction, and the index of the virtual MPEG file that stores the information of the taking-out position of each partial moving image, and the position information of the partial moving image of the index are stored. Based on the above M
And a unit for retrieving and displaying the partial moving image from the PEG file, and a unit for rewriting the position information of the partial moving image in the index and performing editing such as deletion and insertion of the virtual MPEG moving image. Characteristic MPEG file pseudo editing system.