MXPA01002070A - Data allocation in dvd recording - Google Patents

Abstract

A method of recording an encoded bit stream, said encoded bit stream representing a plurality of video objects comprising a sequence of cells together constituting a part of an MPEG2 Program Stream, on a disc like record carrier, such as an optical disc. The method comprises recording multiple series of contiguously arranged video objects constituting multiple video object sets on said disc with corresponding multiple management information comprising attribute information of the corresponding video object set. The management information constituting with a video object set a plyable video title. The multiple video object sets are combined into a single combined video object set and the multiple management information is preceding said combined video object set.

Description

Distribution of data in a DVD recording. The invention relates to a method for recording information signals in code as recited in the preamble of claim 1 on a disk as a carrier of the recording, such as a disc that can be read optically. Below, the invention relates to an apparatus for improving the method.

The DVD-video format for discs that are read optically is defined in the DVD specifications for the read-only disc, part 3: Video specifications (version 1.0, August 1996). Hereinafter, the relevant parts are disclosed, for example in European patent application EP 724 264 and in US patent 5 784 528, documents D1 and D2, respectively, in the list of referred documents found at the end of this description. . Both documents are incorporated herein by reference. The DVD-video format as defined in the specifications for read-only disk mentioned above and revealed in D1 and D2 was created to store movies and other video content in read-only DVD Media, some of the features of the DVD format - video make it less suitable for real-time recording applications. However, it is convenient to create and record video streams and associated data structures in media that can be rewritten in real time, which should preferably be almost identical to the structures defined in the DVD-video format, said discs that can be rewritten should have a recording compatible with most of the installed base of the DVD players -video of the consumer. The method according to the invention describes a novel and inventive format for real time compatible DVD-video recording of video streams, which will be referred to hereinafter as Real Time DVD-Video Recording or DVD recording - video. It is intended that the format defined be for home video recording in an optical medium which is compatible with DVD - video players. The aforementioned DVD - video format demands that the data for a Video Title Group (VTS) be located contiguously. Which implies that titles can not be fragmented except to intersperse. In this respect, a title is defined as a user accessible unit in the title search indicator table of the DVD-video format. This requirement implies that the user must see the disk as a linear recording space equivalent to a tape in which the titles are presented to the user in order of recording. However, this causes all kinds of problems when part of the data is overwritten with new recordings such as when adding, overwriting, or deleting a title. One possible solution would be to sort all the titles in a group of video titles, preceded by a video title group information area (VTSi) and an area corresponding to the general information of the video manager ( VMGI, for its acronym in English). However, this has the disadvantage that it will no longer be possible to distinguish between the different parameters established for each title, such as, for example, the frame resolution of the video parameters, the frame rate, orientation ratio, and bit rate. .

Consequently, among other things, one of the objects of the invention is to make evident the disadvantages mentioned above. According to one of the aspects, a recording method for the invention is characterized as recited in the feature part of claim 1.

Now each reproducible title can have its own driving information. Locating the management information in advance of all video objects has the advantage that groups of video objects can be viewed as a single composite video group, leading to a simplified location. More advantageous aspects of the invention are recited in other claims These and other aspects and advantages of the invention will be apparent in more detail hereafter with reference to the disclosure of the preferred embodiments, particularly with reference to the accompanying figures in which, Figure 1 illustrates a linear ribbon model in view of some typical video recording actions; Figure 2 illustrates the structure of the video area on a disc according to the DVD-video format; while Figure 3 shows in more detail the arrangement of a group of video objects (VOBs) of Figure 1 in Video Objects (VOB, for its acronym in English) and cells; Figure 4 shows a possible disposition of all titles in a Group of video titles; and Figure 5 shows a multiple group arrangement of video titles according to the embodiment of the invention; Figure 6 shows a recording apparatus according to a first embodiment of the invention, the respective units are illustrated in more detail in the following figures, of which Figure 7 shows an A / V input unit; Figure 8 shows a CODEC unit; Figure 9 shows an output unit A V; Figure 10 shows a disk unit, and Figure 11 shows a system control unit.

Figure 1 illustrates the concept of the linear tape model in view of some typical recording actions. Figure 1a illustrates the recording of a first title in a linear address space of a DVD disc with remaining free space 2. According to the DVD-video format, the data is located contiguously. Figure 1B illustrates how to add a title 2 after the title 1. Figure 1C shows how to add to the existing title 1, the attached part indicated by the arrow. Part of title 2 of Figure 1C is overwritten. Figure 1 D partially illustrates the overwriting of the title 2. Figure 1E shows the deletion of the title 3 of Figure 1D. Figure 2 illustrates the DVD-video area according to the DVD -video format. There is a Leadjn zone, a Lead_out zone and a file system, which although present, is not described in this figure. The DVD - video area begins with a Video Manager Area (VMG) that is composed of a General Information Area of the video manager (VGMI), a Video Object Group (VOBS) area and a Duplicate area ( DUP) that contains a copy of the general information area of the video recorder (VGMI). A Group of Video Objects (VOBS) is a collection of contiguously recorded VOBs as will be illustrated hereinafter with reference to Figure 4. The Video Manager (VMG) contains information about the recorded video data and a Menu of titles. This menu gives the user access to the Playlist and, optionally, to Full Titles. A Playlist is a title that represents a recording sequence of Cells from a recorder. A Cell is a sequence of one or more Video object units (VOBU). The first VOBU of a Cell will contain video data. A Cell is the basic presentation unit for the Program Chains (PGC), which is a recording sequence of Cells for the presentation of a Menu or a Title. A complete Title represents a Recording. When a full Title is played, all the complete Cells containing the Record in the order of the data location are played in the Video Object Group for Titles in a Video Title Group (VTSTT_VOBS). A Recording is a contiguous piece of the Video Object Group for Titles in a Video Title Group (VTSTT_VOBS). A Video Object (VOB) is (part of) a sequence of contiguously recorded Cells, which together constitute (part of) an MPEG-2 program stream containing MPEG-2 program stream packets as defined in ISO / IEC 13818-1 which refers to MPEG-2 systems, document D3 in the list of referred documents that can be found at the end of this description. The Title Search Indicator Table is one of the elements of the Video manager This table lists all the Playlists and fos Full titles available on the disk. It is a starting point to find the data that is relevant to put the recording of a Title. Free Space is a recording that is represented by a Free Space Title in the Title Search Indicator Table. If the last Recording has space * free, it is not represented in this table. A Free Space Title is a complete Title or a Title of playlist that can not be played, since the chain information of the related program contains a pre-command that prevents it. Locked Play_time (), Search_time (), Playback_TPT () and PTT_Search () for the Free Space Title. The Cell information in the Free Space Title program string may not be reliable. After the Video Manager (VMG) can follow several Groups of video titles (VTS # 1, VTS # 2 ...), each Group of video titles (VTS) preceded by Information of groups of video titles (VSTI) that contains information regarding the Group of video titles (VTS), such as audio and video parameters. By following the Video Title Group Information (VTSI) they correspond to the Video Object Group (VOBS) that contains MPEG-2 video for the respective Menus and Titles. Each Video Title Group together with the Duplicate area (DUP) contains a copy of the Video Title Group (VTSI) information. Figure 3 illustrates in more detail the arrangement of a Group of Video Objects (VOBs) of Figure 2 in Video Objects (VOB # 1, VOB # 2, ...) and Cells (CJDN = 1, CJDN = 2 , ...) recorded contiguously. The VOBs used for the menus are stored in the VOBS of the Video Manager (VMGM_VOBS). The VOBs that are used for the titles are stored in the VOBS of VTS titles (VTSTT_VOBS). Figure 4 shows a possible disposition of all Titles in a Group of video titles. Following the Video Manager (VMG) area is just a Group of video titles preceded by a Video Title Group Information area (VTSI) and a corresponding Duplicate area (DUP). The Video Title Group (VTS) contains two Titles in this example (Title 1 and Title 2). The corresponding Presentation Control Information (PCI) and the Data Search Information (DSI), which is not shown in Figure 4, is scattered throughout the User Packages. navigation (NV_PCK) corresponding to each Video Objects Unit (VOBU) of the Video Objects Group (VOBS). According to the DVD-video format, a Group of Video titles (VTS) has a separate reference point in the Navigation Pack (NV_PCK). Each Navigation Packet (NV_PCK) has a Logical Block Number (NV_PCK_LBN) that is relative to this reference point (Offset VOBS in NV_PCK). ' When the real-time data of the Video Object Group (VOBS) is overwritten with a new Title, the Video Title Group Information (VTSI) and the Video Manager Information (VMGI) are updated. However, the incorporation according to Figure 4 is limited in that the Video Title Group (VTS) can only contain one parameter set for video and audio. For example, the parameters related to the orientation ratio, Long duration mode versus Normal Duradon mode, Frame size and Video code mode (MPEG1 and MPEG2) and so on. An incorporation according to the invention that reduces this disadvantage will be disclosed with reference to Figure 5. Figure 5 shows a multiple video title group arrangement according to an invendop incorporation. This arrangement allows groups of multiple video titles interspersed (VTS # 1, VTS # 2, ...). Real-time data from Video Title Groups (TITLE 1, TITLE 2, TITLE 3) are arranged consecutively, while the corresponding Video Title Group Information (VTSI # 1, VTSI # 2, VTSI # 3) is available separately. When the real-time data is overwritten, these information structures are adapted so that only the references for the remaining data structures are performed. Reproducers do not realize that the real-time data of several video title groups are arranged interspersed. With reference to Figure 5A, which only shows a Title (TITLE 1), Figure 5B shows an Adidonal Title (TITLE 2) and Figure 5C shows two additional titles (TITLE 2 AND TITLE 3). It is noted that each Navigational Package (NV_PCK) has a Logical Block Number (NV_PCK_LBN) that is relative The first sector that contains real-time data from any Video Title Group (VTS). This is seen as the common reference point for all real-time data. The video title group information files (VTSI # 1, VTSI # 2, VTSI # 3) are located in separate areas on the disk, preferably in front of any real-time data structure. This is also done for the corresponding Duplicate files (DUP1, DUP2, DUP3). Each Video Title Group can have its own video and audio parameters as defined in the Video Title Group Information (VTSI). Figure 6 shows a recording apparatus according to the first incorporation of the invention. The engraving apparatus consists of several units. A unit is the input unit A / V 1. The input unit A / V 1 redbeads image and sound signals at the antenna input terminal 2 and at the external sound / image input terminal 3. The terminal Antenna input 2 is adapted to redirect modulated AV signals transmitted by any satellite, either terrestrial or cable origin. The external sound / picture input terminal 3 is adapted to redirect an unmodulated audio signal or unmodulated video signals generated directly by audio or video sources, respectively. Figure 7 illustrates in more detail the input unit A / V 1. A tuner 5, which is connected to the antenna input terminal 2, eliminates the modulation of the modulated A / V antenna signals and outputs the signals without modulated to a suitable A / V 6 de-multiplexing unit to separate the audio signals from the video signals. An AJO audio converting unit 7 outputs a digital audio signal A and a decoding unit NTSC / PAL / SECAM 8, which comprises an A / D video converter and outputs a digital V-video signal. These signals A and V they are emitted to a coding / decoding unit 9, which is illustrated in more detail in Figure 8. The encoding / decoding unit 9 compresses and encodes signals A and V, with an audio encoder 10 and a video encoder 11, respectively, and converts them into a multiplexed and compressed stream conforming to the specifications of video recording, with the use of a multiptexor 12. For such purposes, the audio encoder 10 and the video encoder 11 are adapted to improve the compression of the source according to the specific standard for compression, such as MPEG-2 for audio and video. The compressed and multiplexed current is presented via the track separator 13, which absorbs the velocity fluctuating from the intermittent recording and data reproduction of a disk, to a disk drive 14. The coding and decoding unit 9 also expands a compressed current reading from a recording medium by a disk unit 14 and separately outputs an audio signal A and a video signal V to the output unit A / V 15. For this purpose, the unit encoding / decoding 9 comprises a suitable decoder A / V 16 for decoding the compressed audio and video source signals. The output unit A / V 15, which is illustrated in more detail in Figure 9, comprises an audio converter D / A 17 for outputting sound signals to an external sound output terminal 18. In addition, the unit of A / V output 15 comprises a video encoder - A / D converter unit 19 for outputting video signals to an external image output terminal 20. Figure 10 illustrates in more detail the disk unit 14. This unit 14 rediscovers the compressed stream generated by the encoding / decoding unit 9 and adds an error corrector code by means of an error correction processing unit 21 to the stream. Then, a channel modulation / demodulation unit 22 converts the current with the error correction code to channel bits adapted for recording in a recording medium 23. In the case of the DVD disc, the EFM + modulation scheme is applied. In the case of an engraving means 23 of the optical type, the recording and reading is carried out with a laser that is located in an optical head unit 25. A laser energy control unit 24 controls the laser. The signals reflected from the recording medium 23 are converted into two-valued signals by an amplifier and waveform equalizer 26. Then, the resulting compressed current is demodulated with the modulation / demodulation unit 22, the error is corrected with The error corrector processing unit 21 is output to the encoding / decoding unit 9 via the track separator 13. A servo circuit 27, connected to the amplifier and the waveform equalizer module 26, controls the position of the control unit. optical head 25 relative to the recording medium 23 and the rotational velocity of the recording medium 23 when controlling the rotary operating means 28. A system control unit 29, as shown in Figure 11, controls each block and improves control of file, handling of control information and control of track separator. For this purpose, a system control processing unit 30 is provided which is connected to the memory 31 loaded with a suitable operating system. The operator's input means 32 and the operator's output means 33 are connected to the memory means 31. The operator input means 32 has dave means and the operator's output means has viewing means. Although the invention has been described with reference to the preferred embodiments, it should be borne in mind that these are not limiting examples. Therefore, several modifications may me apparent to those who are experts in the subject matter, without departing from the scope of the invention, as defined in the claims. The invention can be implemented through hardware and software, and different "media" can be represented with the same hardware item. In addition, the invention falls on each novel feature or combination of features. It should also be noted that the phrase "consists of" does not exclude the presence of other elements or steps different from those that appear in a claim. Any sign of referenda does not limit the scope of the claims.

LIST OF DOCUMENTS REFERRED (D1) European patent application EP 724 264 (D2) U.S. patent 5784 528 (D3) ISO / IEC 13818-1: Information technology 1995 - Generic coding of frames in motion and associated audio information: Part 1: Systems (Systems MPEG2)

Claims (12)

CHAPTER CLAIMING Having described the invention, it is considered as a novelty and, therefore, the content is claimed in the following: CLAIMS

1. A method for recording a coded bit stream, said coded bit stream represents a plurality of video objects that are composed of a sequence of cells together constituting part of an MPEG2 program stream, on a disk as a record carrier, as a disk optical, said method consists of: - the recording of a series of video objects arranged contiguously as a group of video objects on said disk, - the recording of management information which is composed of attribute information of the group of objects of recorded video, in which said handling information precedes such a group of video objects and constitutes with them a video title that can be reproduced, characterized by, the recording of at least a second series of video objects arranged in a contiguous manner that constitute a second group of video objects corresponding to the second handling information on said disk, in which - at least the two groups of video objects are combined into a single group of video objects and the first and second handling information precedes said combined group of video objects.

2. A method according to claim 1, wherein each video object contains navigation information that employs a common reference address.

3. A method according to claim 2, wherein said reference address is at the beginning of the first series of video objects, after the handling information.

4. A method according to claim 3, wherein the attribute form is composed of frame resolution and / or video coded mode of the group of video objects.

5. A method according to claim 4, wherein a video title that can be reproduced, a group of video objects and the handling information correspond respectively to a Group of video titles (VTS), a Group of video titles Group of video objects (VTSTT-VOBS) and Video Title Group Information (VTSI) of the DVD-only Video Specification.

6. A method according to claim 5, wherein the navigational information corresponds to the Navigational Package (NV-PCK) of the DVD Read-Only Video Specification and the common reference direc- tive corresponds to the first logical block number of the first Group of video objects from the series of groups of video objects.

7. A recording apparatus for recording a coded bit stream, which represents a plurality of video objects that is composed of a sequence of cells together that are part of an MPEG2 program stream, on a recording disc carrier, such as an optical disc, the recording apparatus consists of - recording means for recording series of video objects arranged contiguously as a group of video objects on said disc and for recording management information having attribute information of the group of recorded video objects, - wherein The operating information precedes said group of video objects and constitutes with them a video title that can be reproduced, characterized in that the recording apparatus is composed of system control means adapted to control the recording of at least a second series of contiguously arranged video objects constituting a second group of video objects and corresponding to the second handling information on said disk, in which at least the two groups of video objects are combined in a only group of video objects and the first and second handling information precedes said combined group of video objects.

8. A recording apparatus according to claim 7, characterized in that the control means of the system is adapted to induce in each video object navigation information using a common reference direction.

9. A recording apparatus according to claim 8, wherein said common reference address is at the beginning of the first series of video objects, after the handling information.

10. A recording apparatus according to claim 9, characterized in that, the control means of the system is adapted to induce frame resolution and / or video encoding mode of the group of video objects as attribute information.

11. A recording apparatus according to claim 10, wherein a video title that can be reproduced, a group of video objects and the management information correspond, respectively, to a Group of video titles (VTS), a Group of video titles Group of video objects (VTSTT-VOBS) and Video Title Group Information (VTSl) of the DVD-only Video Specification.

12. A recording apparatus according to claim 11, wherein the navigational information corresponds to the Navigational Package (NV-PCK) of the DVD Read-Only Video Specification and the common reference address corresponds to the first logical block number. of the first group of video objects from the series of groups of video objects.