TW200842836A - Frame accurate conditional access on Blu-ray disc MPEG 2 transport streams - Google Patents

Abstract

A user application is provided on a recorder/player for controlling access to video on a frame-by-frame basis. Initially, the playlist is indicates frame portions that are all unhidden, the user marks frame portions for conditional access by inserting specific markers. The user enters a password to enable conditional access for the marked frame portions. Upon playback, the system will require entry of the password to enable viewing of the marked frames.

Description

200842836 IX. INSTRUCTIONS: [Technical Field of the Invention] The present invention relates to editing audiovisual data streams, and more particularly to precise frame conditional access to audiovisual data streams. [Prior Art] The high-capacity storage standard of the latest technology is Blu-ray. The Blu-ray system provides a significantly larger storage capacity than the old optical storage media. There are many applications that can enable Blu-ray Disc (BD), including but not limited to mass storage, from a variety of sources (including but not limited to video recorders, digital video recorders, optical storage media, satellite transmission, broadcast A storage of digital audiovisual (A/V) data streams from any source, such as a transmission. Bd's high storage capacity and high speed data transfer rate provide high definition video recording that could not be achieved before the advent of blue light. Digital video recorders typically use one of the Moving Experts Group (MpEG) formats to record video. These formats provide little or no access restrictions. The advanced features currently known in the art (such as frame-accurate conditional access using dense computations and/or memory make it impractical to include such advanced features in consumer products. Currently available technology The video in the 5 gram phase PEG data stream is decoded and then re-encoded to be stored in the same G format. These techniques provide basic conditions but are still current for professional or high-end consumer electronics. The consumer electronics implementation implements a sexual access for digital video recordings, which is highly specific and therefore not portable or subject to the circumstance to provide accurate frame conditional access. Therefore, currently 125140. Doc 200842836 The technology available must be balanced between the relative and the integrity of the opposite. One of the more common techniques used to edit video sequences is to use the boundaries associated with animation groups (GOPs). Editing occurs. By selecting one of the frames or frames to be edited, all frames in that 〇〇1) must be edited. Therefore, if this method is used, it is not expected that the conditional access frame will accept conditional access, and vice versa, since the G〇p boundary is used to decide which frames to edit. This method is called G〇p precision editing, and is very suitable for low-end products, but the editing of GOP level can not be accepted by professional products. Figure 1 illustrates the editing that occurs at the level of the GOP, wherein a video sequence having N Gops has a first G 〇 p 12, a second G 〇 p 13, a second GOP 14 and a second look-up 15 . If (10) is used for precise editing, the system will offset the editing boundaries to match the boundaries of the GOPs. For example, to edit the video sequence 11, the # midpoint A indicates that the start frame of the frame sequence to be edited is within the boundaries of the GOP 12. (8) p 12 has a starting point ai and continues to the bottom of the next GOP 13 (located at the point. f) The video sequence 11 to be edited has an end point B, which must be offset to point bl (the terminal of the previous G0P 14) Or point b2 (the terminal of the current G〇p 15). The more frames the encoder has in a G〇p, the worse the situation becomes. Or the offset of B (as shown in Figure 1). To achieve the time-consuming, accurate MPEG re-encoding for frame-accurate, frame-accurate editing is more accurate than G〇p-based editing without causing point A and / by re-editing the edited GOP. The system, which is a highly intensive program, requires a hardware resource of 125U0.doc 200842836 to perform the re-encoding. Therefore, there is a frame-accurate editing of an mpeg data stream in this technology. One needs. The sub-resources need to re-encode the MPEGf stream for frame-precise playback of edit points in the MPEGf stream, previously

Technology has been developed by adopting a bridge sequence between the #M Shizheng Temple and the flat point: for a solution. Compared with the instant decoding of the δΚ frame, the MPEG frame is re-encoded to generate a splicing sequence, which usually takes about 2 to 4 Ο.

Double the computing power. Job 6 () 54244 (the content of which is incorporated herein by reference) has been proposed for the re-encoding-MPEG data stream to solve the resource demand problem, namely the editing in the -MPEGf stream. The point provides a precise and compact play of the frame. WQ2_G5424 is afraid of no (4) conditional frame accurate playback of the teaching content. In view of the above, there is still a need in the art for accurate editing of the §fL box without the need to generate a bridge sequence. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide accurate frame editing without the need to generate a bridge sequence. The emergence of digital broadcasting, the availability of more computing power, increased memory in consumer products, and storage technologies that provide higher bit rates (such as Blu-ray) enable advanced conditional access features that can be implemented in consumer products become possible. The robustness of the Blu-ray specification is sufficient to enable accurate frame conditional access. The BD-RE (Rewritable Blu-ray Disc) specification defines the real and virtual 125140.doc 200842836 playlists that identify specific video sequences within the MPEG-2 transport stream. The BD-RE specification further defines a Blu-ray® Personal Identification Number (PIN) that provides a lock feature that can be used for playback or recording. The purpose is to provide a specific embodiment for providing a method and apparatus for performing frame conditional access by using existing standards. 3 "Another-purpose is to provide a specific embodiment for providing a method for implementing conditional access by using a πN and a password as defined by the rewritable Blu-ray standard specification (bd training). And another object is to mitigate, mitigate, or eliminate one of the prior art deficiencies and impairments identified above, either individually or in any combination, by providing: methods, devices, a corresponding decoder, and a The computer of the code can provide a specific embodiment for solving at least the above problems. Another object is to provide a specific embodiment for using the mark defined in the standard. Defining an edit start point (•η P〇int) and an edit end point (10)-point point' in an audiovisual (A/V) data stream to implement conditional access. Further, an object is provided to provide a specific embodiment. 'A method for de-accurate conditional access to an already edited audiovisual (Av) f stream - the middle method includes the use of a sequence for identifying the data stream from the slave Only lose people correctly - The object is viewed in the case of piN. Another object is to provide a device for frame-accurate editing of an encoded A/V data stream of 125140.doc 200842836, wherein the device is configured The start-up and duration of one of the sequence of frames to be skipped within the AV stream during playback of the edited stream is indicated by a setting-mark. The purpose is to provide a specific embodiment provided by the core _ kind of computer " ^ take media 'The computer readable media is used to provide frame-accurate conditional access for the encoded A/V poor stream for computer processing, and (:x contains - program a code segment for setting a - flag to indicate the start and duration of one of the frame sequences to be skipped when playing the Avf stream in addition to the correct input of a PIN. Another object is to provide a specific embodiment, It is directed to a decoder system that can decode an encoded AVf stream from a storage medium. A decoder system including one of the decoders for decoding an encoded AV stream is configured to Skip one The segment is decoded more ambiguously than the normal speed, the segment has been designated during editing to not allow playback if Ο is not entered. Another object is to provide a specific embodiment, It configures a frame buffer, stores the decoded frame from the decoder, and feeds one of the decoded frames at a normal speed, wherein the decoder is configured to stop feeding the buffer and In the case of a correct input, the reading is continued from the encoded data stream according to the playback direction at the beginning of the post-going GOP or a first G〇p. Further, the objective is to provide a specific embodiment having The video sequence of the 125140.doc 200842836 is not played when the skip start flag is reached, and the video sequence is also marked in the video sequence. The video sequence continues to play after the last frame of the duration indication, thereby providing a compact play that does not play the video sequence except when a PIN is entered. Another object is to provide a specific embodiment that has a fast user response that does not require re-encoding the MPEG frame. Another object is to provide a specific embodiment for frame-accurate editing of an encoded audiovisual (AV) f stream that does not require additional free storage media space. Another object is to provide a specific embodiment for frame-accurate editing of an audiovisual (AV) stream that does not require generation of a bridged sequence. [Embodiment] - The situation is applicable to the specific embodiment of accurate frame editing, which can be used to provide accurate frame marking of the video data stream. Variations to the specific embodiments described herein will be readily apparent to those skilled in the art. These variations should be considered to include other Α/ν storage formats (including, for example, HD DVD) because they employ features within such alternate storage formats that can be provided similar to those described herein for bd_re = code) and the equivalent function of the flag. The specifics described in this article: The ambassador can use the standard to define the recording format of the storage medium. The invention can be implemented by any storage medium (e.g., optical disc, ribbed media card, etc.). 〃 2: A mark can be defined as being represented by a heading; the overall time used by the vehicle is time-stamped by one of the indicators cited. One; = in bow | with prominent or unique scenes for playback. In addition, a tag can have 125140.doc -10- 200842836 with several attributes' such as name and duration. The duration defines the length of the marker, such as the length of a chapter marker. An application format defines the use of several criteria. One of the application uses is to hide the AV portion that is identified by the length of the mark and not played. In Blu-ray Disc Specification Version 1, this class of privacy is called a skip start tag and is used to provide frame-accurate conditional access, as explained in more detail below. Figure 2 presents an example of a skip start marker. Explain an av stream ('2', where a skip start tag defines the beginning of sequence 22 of one of the frames of the AV stream to be skipped. As mentioned above, the skip start tag contains information about time The duration of the (t in Figure 2) information, during which the AV stream will be skipped during playback, ie the playback of the AV stream ends at the frame 2 before the skip start flag. The terminal continues from the first frame 24 after the terminal of the duration indicated by the flag. One embodiment of the Blu-ray standard is in BD-RE (Recordable Blu-ray Disc) Specification Version 1\0 Section 4.3.7.3 Define the skip start tag with the same assignable U duration. For example, to Philips lntellectual Pr〇peny _

Systems (IP&s) company (website http://wwlicensingphil_^ BD RE specifications (for example). You can insert this in a precise layer, level, etc. (10) · RE skip start tag. As mentioned above, these are mentioned Skip the start tag to skip one of the 'part' instructions of the one of the recorded BDs containing such tags, and is generally used to hide the selection to avoid playback. $ should pay attention to ' The skip start tag is specifically defined for playback, while the BD RE specification VI · does not provide a defined play skip mark for editing 125140.doc -11 - 200842836 Start/edit termination point suggestion or motion Precise conditional access to the data stream using standard features of the B]D_RE specification by performing g〇p precision editing on the MPEG data stream and then using the skip start tag with a tag definition material, This is specified in Section 4.3.8 and Section 4.3.3.3 of the BD-RE specification mentioned above. In Figure 1, the skip period is defined by placing a skip start marker on the point person. , its eight points of ambiguity to one of the duration of a2, And placing another skip start marker at point b 1, which has a duration from point b 1 to B. The frame belonging to the skipped time period requires a conditional access frame, and is referred to herein as To skip the frame, these skip frames can be implicitly decoded in the background mode to explicitly implement the step advancement and/or step back of the frame during playback. An embodiment has the steps of loading an AV stream from bd into an editing device, 41 editing an Av stream on a G〇p level, 42 editing an AV stream at the frame level, and 43 writing on the BD. Start-stop tag. In step 4, an AV stream is read from a BD into a suitable editing device. In step 41, the AV stream is edited at a GOP level, which has a computational advantage. Selecting one of the eight data streams has an area (herein referred to as a fragment) that needs to conditionally access a frame sequence. When the fragment is identified on a G〇P level, in step 42 at the frame level Continue the editing on the top, ie the user exactly identifies the bar to be applied The first frame and the last frame of the fragment of sexual access. As an example, a fragment that requires conditional access may be considered to be violent or yellow. The user can use various components, such as Figure 125140.doc -12- 200842836 User interface and input device (such as a v J ^ mouse, a touch screen, a remote control, etc.) in the first frame set - edit starting point and at the end Frame setting—Editing the termination point (conditional access to the frame is required). According to this method, a skip start flag is set in the first frame, and the duration is set to have a required strip. The first news of the fragment of Wending's conditional access

Frame to the end of the δίΐ box's length. In the boat rK and returning step 43, the mark is recorded to the BD, which causes the player to play in addition to the condition of the supply access and the pick-up.

Skip the required clips. According to a specific embodiment, a skip start flag as defined in conjunction with redemption is used to establish conditional access. These skip start markers indicate the beginning of the portion of the sequence that requires conditional access. These markers are used to implement the edit start point and the edit end point to allow the frame to be closely and closely played without creating a bridge sequence. Hill Figure 5 shows the application of the BD Skip Start Marker for frame-accurate editing, in which the Blu-ray Recorder 50 provides the user with a "edited-to-get feeling. This means that by means of a m-frame by-- The recorded _ and the stride 4 in and the stride back to perform the precise editing of the frame. As described above, the user locates a desired scene for which conditional access is to be applied. When the scene is played back, if the condition is not met, the % of the conditional access will not be displayed. This condition can be entered as a password or a ρΐΝ number. It may be possible for the viewer to enter a password or ΡΙΝ number as a condition for obtaining access to the content in order to view the content to which the conditional access has been applied. This conditional acquisition is applied at a precise level of the frame. Alternatively, the condition can be applied to alert the viewer. No 125140.doc -13- 200842836 In the -scene mode, the selected area will be played and the unselected area will be skipped. This mode of operation is used, for example, when the user wants to retrieve material from the video sequence. In this case, the start skip flag is set to the beginning of the unselected regions, respectively, and the duration is set to the length of the unselected region.

- The above technology is implemented in accordance with the BD_RE standard. Due to the use of the marking data provided in the BD specification, this method is compatible with the fBD specification (the other embodiments are compatible. Those skilled in the art will appreciate that it is permitted to provide frames within the audiovisual data stream. A similar technique can be implemented within the other criteria of the indication of the tag. Referring to Figure 6, a specific embodiment is an action sequence. Initially, a real playlist is generated with portions a, b, c and D that were initially not hidden at all. In the example shown in Figure 6, the user marks a portion c for conditional access (e.g., lock/hide portion c). The frame can be accurately framed by inserting a specific tag defined in the BD_RE standard. Implementing the video portion (marking. The system requires a password during playback. The specific embodiment can be modeled according to the BD-RE standard. For example, the BD-RE standard currently defines five directories, each of the five directories There is a possibility that a unique password is required. To make a directory unprotected, BDAV-protect_flag (as defined in Section 4.2.2.2 of the BD-RE Standard Part 3) Set to a logical state. The BR_RE standard also defines one for individual content segments in any given directory. By setting the BDAV_protect_flag to a logical state, a complete directory is reserved as Protected. If a complete directory is kept unaffected by 125140.doc -14- 200842836

Bao Han can still protect individual content items by setting the playback-protect_flag to a logic 1. During the editing process, in order to provide conditional access for a specific content item, the BDAV_pr〇tect-negative is set to a logical state, and the playbac, pr〇teet_fiag for the content segment is set to a logical one. . At this point, the system will ask the user to enter a password. The user can enter a 4-digit password (re-confirmed by the system), which is stored as a disc PIN block (as defined in section 4.2.2.2 of the BD_RE Standard Part 3_Viewing Basic Specification). The system may require the password each time a playlist (real or virtual) with such a hidden portion is activated. If you enter the correct password, the hidden parts will also play. If the correct password is not entered, only the non-hidden portion of the playlist will be played. This password is stored as a disc PIN unit (as defined in section 4.2.2.2 of bd_re Standard Part 3 - Basic Audiovisual Specifications). 3 illustrates a specific embodiment of a decoder for buffering the conditional access of the buffer memory between the decoder and the output. An encoded AV stream 30 is read from, for example, a BD to a FIFO-type storage device for storing the decoded frame 34. The decoded frame 32 from the AVf stream is placed in the frame buffer 33 in the -F1^0 mode during the stream playback. As long as the buffer (4) does not encounter a frame with conditional access, the decoder is typically populated by frame 34. Buffering ° The appropriate size can be tied—skip the start marker may indicate skipping the number of frames. If the decoder 31 arrives - skips the start. , then it is in the hidden area (ie, the skip start flag 125140.doc •15- 200842836 w 1 ϋ, in the example shown in Figure 1, this area is σορ 15. The body is full, the benefit is in the background mode G0P starts decoding the frames without putting them into the frame broadcast: crying D & eight sets (4) (4) 35 money from the frame to the door 4 to ensure tight (four) put. - decoding 11 31 will decode the last frame in the hidden area 22, and will again put the box into the frame buffer # to ensure close play. Γ: Although the decoder 31 illustrates a use I’m talking about the buffer 33, but those skilled in the art will understand that many types of storage devices can be used for the buffer 33. Or 'no separate storage devices are needed, and the decoded frames may be placed in large numbers. DETAILED DESCRIPTION OF THE INVENTION The specific embodiments contemplate the use of standard defined entities. These embodiments combine certain entities defined in the standard in a specific manner to achieve an insulting security < column as for a recorded Any home video (for example, wife == little baby and wife False 'and so on', which may include the requirement to require a clear or password to view the specified fragment if it is necessary to be protected from the squad. If a recorded sequence contains from # The broadcast of a fee channel to a BD_REJL movie (a copy or free copy of a movie) may require a password for a particular segment. It may be useful to have a Φ code to view a particular sequence. Other embodiments may use the DVD+RW standard. The standard + class standard has a chapter hiding, which is used to block a specific video clip by playing a normal play key. This section hides the terminal user from playing the hidden clips completely. Call Edit or click Edit Function 125140.doc -16- 200842836: "Play Full Title" in the table. Introduce the chapter hiding concept in DVD+RW as a complete compatibility with the DVD-Video standard. The balance side ^ because of the main advantage of the excitation + RW - lies in its compatibility with the Qing video playback state). From a standard point of view, this standard (essentially) does not require DVD video compatibility. The DVD player can still play the DVD video disc, and the specific video chip can be implemented on the DVD video disc by using the BD-RE recorder using one of the above embodiments.

The segment really blocks. The above-described embodiments have various applications and uses, including exemplary fields such as full = column blue light recording and playback products (e.g., f- or professional B D recorders, BD storage solutions, etc.).

Other embodiments include any A-storage application that utilizes the _ tag as described above. In other embodiments, no editing is performed on the video packet bearer. In addition, only the additional metadata of the video (i.e., skip start mark position and mark definition data) is written to the disc. Particular embodiments may be practiced in any suitable form, including hardware, software, and combinations. The idea can be implemented as a computer software running on - or multiple data processors and/or digital signal processors. - Timed components and components can take any two suitable approaches: physically, functionally, and logically. In fact: This functionality can be implemented in the -early-unit, in a plurality of units or as part of other functional units::. The present invention may be implemented in a single-premium or may be physically and functionally distributed between different units and at a location between 125140.doc -17- 200842836. While the above φ has been described in terms of a timed arrangement, such specific embodiments of the invention are not intended to limit the scope of the invention. In fact, the scope of the accompanying patent application will determine the scope of the invention. You should be aware of the different marks than the above. In addition, those skilled in the art will appreciate that the above embodiments are based on the forward playback of the edited video stream' and the same principles apply when the playback direction of the edited video stream is reversed, with only the same direction. In the context of the claims, the term "comprising" does not exclude the presence of other elements or steps. In addition, although individually listed, a plurality of components, elements or method steps can be implemented by a single unit or processor, for example. In addition, the = tube can include individual features in different request items, but it may be possible to set this up: a special combination of special features, but not included in different request items - the feature combination is not feasible and In addition, the singular reference number does not exclude plural. The terms "-", "one", "first", "second", etc. The reference signs in the claims are for illustrative purposes only and are not to be construed as limiting the scope of the claimed invention. The features described in the foregoing embodiments may be used. Scene mode for unselected areas. The start of the zone_skip flag is appropriately set to the unselected production. The duration can be set to 'the length of the unselected area to: enable each of these modes by -_ or a password to achieve the desired function for the individual scene. In contrast to the prior art solutions for precise frame editing, the above-described embodiments of the present invention 125140.doc 200842836 are not implemented in a one-y non-precise manner. The next day is accurate. Due to the use of the mark provided for the provincial BD specification, RD recruits 坆々 十 - ten 此 this method can be compatible with these =::: implementation. With one. Ν - - - 密码 二 二 二 二 二 二 二 二 二 二 二 , , , , , , , , , , , , , + % - The above method according to the present invention has various applications and uses, and includes the Ou Guangcai/j's Lonely 5 recorded and played products (such as consumer or professional recorded, BD storage solutions, etc. It can be enabled by _ to achieve an exemplary domain for individual 曰 ^ , , , , , , , , , , 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 The application can be stored, which can be enabled by Sun Yashan@ 』 by a PIN or a password to achieve the desired function. The other U system does not edit the video packet bearer and uses the extra 70 shells of the video to transmit the two features', that is, additionally writes the skip start mark position and the mark definition data to the optical disc by one A pass or a password is enabled to achieve the desired editing function. 0 Any specific form of mouth (including hardware, soft body, weaver blade or any combination thereof) is taken to implement a specific embodiment. Other implementations can be implemented as computer software running on one or more data processing processors and/or digital processors. The components and/or components of a particular embodiment can be physically, functionally, and logically implemented in any suitable form and enabled by a - (4) or --password. 125140.doc -19- 200842836 [Brief Description of the Drawings]: These and other aspects, features, and advantages of the present invention will be understood and appreciated by the description of the embodiments of the invention. Figure 1 is a schematic diagram of one of the G〇p precise editing of an MPEG-2 data stream. Figure 2 is a schematic illustration of one of the examples of skipping the start tag; Figure 3 is a schematic illustration of a decoder model; 4 is a flowchart illustration of one of the methods according to one embodiment; FIG. 5 is a schematic illustration of one of the devices according to a specific embodiment. FIG. 6 is a real playlist according to one embodiment. Explain one of the playlists. [Major component symbol description] 11 Video sequence 12 First GOP 13 Second GOP 14 N-1 GOP 15 Nth GOP 20 AV stream 22 Frame sequence/Hidden area 23 Frame 24 Frame 30 Encoded AV Stream 31 Decoder 125140.doc -20 - 200842836 32 Decode Frame 33 Buffer/Storage Device 34 Frame 35 Output Device 50 Blu-ray Recorder 125140.doc -21 -

Claims (1)

200842836, the scope of the patent application · 1. The method of accurate access to the frame on the audiovisual data stream uses at least one mark to identify each segment in the A v; at least one segment in the frame shake Editing the segment identified by the tag; and providing a password to enable viewing of the segments. 2. If the method of requesting the item, a data stream.栝 编 储存 储存 该 该 该 AV AV AV AV AV AV AV AV AV AV AV AV AV AV AV AV AV AV AV AV The method of two long term 3 wherein the skip start flag defines the start and duration of one of the frame sequences of the Α γ data stream clipped during editing of the lean stream. And the method of the member, further comprising storing the edited audiovisual stream having the segment identified by the tag on a storage medium to provide conditional access during playback of the segment. The method of claim 5, further comprising playing the edited AV stream and prompting the password to effect viewing of the segments. The method of claim 6, further comprising: playing the compact horse in a compact manner by skipping the frame between the edit start point and the edit end point established by the mark if the secret horse is not correctly input The edited AV data machine', and if the password is correctly entered, the edited AV material is played in a compact manner by not skipping the frame between the edit start point and the edit end point established by the mark. flow. 125140.doc 200842836 8· A device for precise access to conditional frames on a coded A/V-accumulated method, L, and downtime. The device is adapted (7) to a request such as a request. The method of item 1, the device comprising: a device configured to set one of the ones and one of the five devices, the flag indicating that the edited AV discreet, the ώ ^ ^ 扪 扪 扪When you want to skip one of the frame sequences from the AV stream, the duration and duration. 9. As requested! The method, wherein the editing further comprises generating a virtual play for the frame-precise conditional access for a deleted g data stream. 10. The method of requesting item 9, wherein editing allows for formation of conditions in the MPEG data stream Conditional access is restricted by any part of the password-restricted viewing, which is in the range from only one frame to all frames. 11. A system for decoding an encoded Av data stream (3), comprising: ', a decoder (31) for decoding a province encoded with a plurality of frames (34) An AV data stream (30), wherein the decoder is configured to detect the frame (34) containing a flag in the 4 encoded AV; I a storage device (33) configured for use To receive and store the frame that has been decoded by the decoding source (31); • a round-out device (35) for reading the frame (34) from the storage device (33); ° - selecting the device, In response to the decoder detecting the mark, the frames indicated by the mark in the frame (34) are placed into the device (33). The system of claim 11, wherein the flag indicates a start of the one of the pivots indicated by the mark and a duration. The system of claim 12, wherein the output device continues to receive from the storage device (33) a system (34) 〇 14· 士明求13, which is not indicated by the mark, wherein The decoder (31) is configured to respond; the decoder detects the flag without placing the frames (34) indicated by the flag in the frame (34) into the storage device ( 33), and continue reading from the encoded beeper (30) at the beginning of a first or last G〇p according to the direction of play until the last frame indicated by the mark is reached. 15. The system of claim 14, wherein the decoder (3 is configured to place the frame (34) after decoding the last frame or first frame indicated by the start marker in accordance with the playback direction The buffer (33) is implemented to perform compact play at the output device (35). 16. The system of claim 11, wherein the storage device (34), a frame buffer (in the FIFO structure) 33) configured to store the decoded frame (34) from the decoder (31) and feed an output (35) to the decoded frame at a normal speed, wherein the decoder (31) Configuring to stop feeding the buffer (33) upon reaching a skip start flag configuring the stream and according to the playback direction, one of the male to-segment segments indicated by the flag is first or Finally, the beginning of G〇p continues to be read from the encoded data stream (30), and the last of the clipped segment to be configured by the skip start flag according to the playback direction. Or after the first frame is decoded, the buffer is continuously fed at a regular speed following 125140.doc 200842836 ( 33), k and provide a close play skip of the clipped section at the 4 output (35). 1 7 · The object of the item 1 _ 々古' further includes storing the flag in the Av data stream 18. A computer readable medium on which a computer program for precise frame access to an encoded A/V stream is included, the computer program comprising: a first code segment, Used to set a flag to indicate the start and duration of one of the sequence of frames to be skipped from the AV stream when playing the edited AV stream; and the first code segment for prompting A password is used to view the frame sequence. 19. The computer program of claim 18, wherein the tag skips a start tag according to one of the Blu-ray standards. 20. The computer program of claim 18, wherein the The code segment embeds the tag in the AV stream. 125140.doc 4·