JP2011119877A - Moving picture reproducing device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discriminate which frame images are reproduced after returned from an error even if the error occurs during the reproduction of coded moving picture data which do not include time stamp information, and to perform the display of correct time information. <P>SOLUTION: When the device detects the error during reproduction of the coded moving picture data, a coded picture in a screen succeeding to a frame including data which have become errors based on management information showing a recording position of the coded picture in the screen included in the coded moving picture data is searched, the position to return from the error is determined, and, displayed elapsed time information is updated based on a searched frame number of the coded picture in the screen when returned from the error. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a moving image playback apparatus and method, and more particularly to a technique for recovering from an error that occurs during playback.

  As a high-efficiency encoding method for moving image data, the MPEG (Moving Picture Experts Group) method and the next-generation H.264 encoding method are used. The H.264 system is known. In addition, recording / reproducing apparatuses that record and reproduce moving image data compression-encoded by MPEG-2 or the like have become widespread.

  In the MPEG encoding system, encoding processing is performed using intra-frame encoding in which only image data in the same frame is encoded, and inter-frame predictive encoding in which a prediction error with a reference frame is encoded. . For example, in MPEG-2, encoding processing is performed by combining an I picture that is intra-frame encoded data, a P picture that is forward predictive encoded data, and a B picture that is bi-directional predictive encoded data.

  In MPEG-2 and the like, the concept of GOP (Group Of Pictures) is introduced as a unit of encoding. A GOP is generally composed of one I picture and a predetermined number of P and B pictures. In the coding order, the top of the GOP is an I picture, P pictures are inserted at regular intervals, and a B picture is inserted between the I picture and the P picture. Encoding is performed in an order different from the input frame order (display order). For example, the encoding order in the GOP is I2, B0, B1, P5, B3, B4, P8, B6, B7, P11, It becomes like B9, B10, P14, B12, B13. Here, I, B, and P represent the types of pictures, and the numbers on the right side represent the display order (the top is 0). The GOP structure as described above is an example, but generally 15 frames are set as 1 GOP, and the appearance interval of I pictures or P pictures is often set as 3 frames. Stream data consisting of a series of such GOPs is recorded on a recording medium by a recording / reproducing apparatus.

  On the other hand, when reproducing the encoded moving image data, decoding is performed in the order of encoding, rearrangement is performed in the order of display, frame images are output, and reproduction display is performed. For example, decoding is performed in the order of I2, B0, B1, P5, B3, B4, P8, B6, B7, P11, B9, B10, P14, B12, B13, and the display is B0, B1, I2, B3, B4, It carries out in order of P5, B6, B7, P8, B9, B10, P11, B12, B13, and P14.

  By the way, as described above, the MPEG encoding method employs inter-frame predictive encoding. Therefore, when an error occurs in the data of the reproduction frame, not only one frame is lost, but it extends over several frames. May be missing. Patent proposal 1 describes a patent proposal relating to countermeasures when an error occurs in reproduced encoded video data. According to Patent Document 1, a technique is proposed in which encoded moving image data in an error period is replaced with normal frame image data immediately before an error occurs.

JP 2005-229395 A

  The technique disclosed in Patent Document 1 refers to a decoding time stamp (DTS), which is a time stamp of encoded data added to system data, in calculating an error period. However, not all encoded moving image data includes time stamp information for representing encoding time and display time represented by DTS. Actually, it can be said that whether the stamp information is included depends on the recording format of the encoded moving image data. For example, some formats for recording MPEG-2 encoded data on DVD stipulate that the addition of a time stamp is essential, but such a format for recording on a memory card or hard disk There are no essential requirements. Accordingly, there are many encoded moving image data that do not include time stamp information.

  Here, it is assumed that an error such as data loss occurs during reproduction of encoded moving image data from an arbitrary recording medium. If the encoded data to be reproduced is in the format of encoded moving image data including time stamp information as in Patent Document 1, it is possible to determine what the time stamp information of normal data after recovering from data loss is You can see which frame is being played back after a missing frame. On the other hand, if the format is encoded video data that does not include time stamp information, the number of frames can be counted up during normal playback to determine which frame is being played back. At this point, it is unclear which frame is currently being played. At this time, if the time code (elapsed time information) of the playback data is displayed, the time display will continue to be interrupted when returning from the data loss, or a value different from the frame being actually played back will be displayed. It may be displayed.

  Accordingly, an object of the present invention is to determine which frame image is being reproduced after returning from the error even if an error occurs during reproduction of encoded moving image data not including time stamp information, and correct time information. It is to be able to display.

  In order to achieve the above object, a moving picture reproducing apparatus of the present invention is a moving picture reproducing apparatus for reproducing encoded moving picture data not including time stamp information, and reproduces the encoded moving picture data from a storage medium. Reproducing means, decoding means for decoding the data reproduced by the reproducing means, and display means for displaying a moving picture and elapsed time information of the moving picture based on the data decoded by the decoding means An error detection means for detecting an error in the data reproduced by the reproduction means, a storage means for storing management information indicating a recording position of an intra-picture coded picture included in the coded moving image data, and the reproduction When the error is detected by the error detection means during reproduction by the means, the error has occurred based on the management information stored in the storage means And control means for controlling to return from the error by searching for a subsequent intra-picture coded picture of a frame including data, and at the time of return from the error, the display means is searched by the control means The displayed elapsed time information is updated based on the frame number of the intra-picture coded picture.

  The moving image reproduction method of the present invention is a moving image reproduction method for reproducing encoded moving image data that does not include time stamp information, and the reproduction step of reproducing the encoded moving image data from a storage medium; A decoding step for decoding the data reproduced in the reproduction step, a display step for displaying the moving image and elapsed time information of the moving image based on the data decoded in the decoding step, and the reproduction step An error detection step for detecting an error in the reproduced data, a storage step for storing management information indicating a recording position of an intra-picture encoded picture included in the encoded moving image data, and reproduction of the encoded moving image data When the error is detected in the error detection step, the subsequent in-screen code of the frame including the data having the error based on the management information stored in the storage step And a control step for controlling to return from the error by searching for a picture, and at the time of return from the error, the display step is based on the frame number of the intra-picture coded picture searched in the control step. The displayed elapsed time information is updated.

  According to the present invention, even if an error occurs during reproduction of encoded moving image data that does not include time stamp information, it is possible to determine which frame image is being reproduced after returning from the error, and display correct time information. Can be done.

It is a block diagram which shows schematic structure of the moving image reproducing device which concerns on embodiment of this invention. It is an example of the display during reproduction | regeneration operation | movement. It is the figure which showed the structure of management information data. It is the figure which showed the relationship between recording alignment and encoding moving image data. It is a flowchart of the reproduction | regeneration operation | movement of the moving image reproducing device which concerns on embodiment of this invention. It is the figure which showed the decoding timing and display timing of each frame image of encoding moving image data. It is the figure which showed the decoding timing of each frame image when an error generate | occur | produced, and the display timing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a moving image playback apparatus 10 according to an embodiment of the present invention. The moving image reproduction apparatus 10 includes a control unit 100, a decoding unit 101, a RAM unit 102, an operation unit 103, a display unit 104, a ROM unit 105, a storage medium interface (I / F) 106, a storage medium 107, and a bus 108. To do. The moving image playback device 10 can also be implemented as a video camera further provided with an imaging unit (camera) (not shown).

  The control unit 100 controls the operation of each unit described above, and includes a computer such as a CPU. A control program executed by the control unit 100 is stored in the memory of the ROM unit 105. Data is transmitted between the units via the bus 108. The operation unit 103 includes various operation keys that serve as an interface with the user. When the operation unit 103 instructs the execution of the reproduction operation, the reproduction operation is executed under the control of the control unit 100. At this time, the storage medium I / F 106 functions as reproduction means, reads the encoded moving image data stored in the storage medium 107, and stores it in the RAM unit 102. The RAM unit 102 functions as a so-called buffer memory.

  The decoding unit 101 reads the encoded moving image data stored in the RAM unit 102 and decodes it according to a predetermined encoding method. The predetermined encoding method is an encoding process using intra-frame encoding in which encoding is performed only with image data in the same frame and inter-frame prediction encoding in which a prediction error from a reference frame is encoded. MPEG-2 and H.264 H.264 or the like. The encoded moving image data used in the present embodiment includes an intra-picture encoded picture (I picture), a forward predictive encoded picture (P picture), and a bidirectional predictive encoded picture (B picture). Shall.

  The moving image data decoded by the decoding unit 101 is supplied as display image data to the display unit 104 via the RAM unit 102. The display unit 104 is a monitor composed of a liquid crystal display or the like, and inputs display image data and outputs a display image.

  The decoding unit 101 has a function of decoding encoded moving image data in a compression-encoded state, an error detection function for detecting an error of data to be decoded, and a frame as a part of display image data A function for generating a number and a time code is provided. The decoding unit 101 can detect an error due to a part of the reproduction data missing by the error detection function. The error is caused by reading or recording data failure.

  FIG. 2 is an example of display during the reproduction operation on the display unit 104. The frame image of the decoded moving image is displayed on the main screen of the display unit 104. Further, the display unit 104 displays a frame number display 200 of the frame image being displayed and a time code display 201 that is elapsed time information (playback time) of the moving image as additional information of the moving image to be played back. . The frame number display 200 and the time code display 201 are obtained by visualizing information generated by the decoding unit 101. Note that the frame number display 200 and the time code display 201 do not necessarily have to be displayed, and either one may be displayed.

  In FIG. 2, the frame number display 200 indicates that the displayed frame image is the 123rd frame, and the frame number displayed every time the frame image displayed on the display unit 104 is updated. Updated. The frame number is generated by the decoding unit 101 with reference to predetermined management information (system data) in the encoded moving image data. The predetermined information will be described later with reference to FIG. The time code display 201 indicates that the current time is 00 (hours): 00 (minutes): 04 (seconds). The time code is information indicating the playback time generated by the decoding unit 101 based on the frame number, and is generated by converting the frame number into seconds. When 1 second is 30 frames, the 123rd When a frame image is displayed, 123/30 = 4 seconds is displayed. When the encoded moving image data is reproduced from the middle instead of the beginning, the decoding unit 101 determines the first I picture to be decoded as an offset frame, and sets the frame number of the offset frame (I picture). get. Then, the time code to be displayed is generated by adding the frame number of the offset frame and the frame number of the frames after the start of reproduction.

  FIG. 3 is a diagram showing the structure of management information data applied to the embodiment of the present invention. Such management information data (system data) is multiplexed with the encoded moving image data and stored in the storage medium 107. Reference numerals 300, 301, 302, and 303 in FIG. 3 indicate information of I pictures included in the encoded moving image data. The I picture information includes an “address” indicating the recording position of each I picture on the storage medium 107, a “size” indicating the data size of the I picture, and a “frame” from the beginning of the encoded moving image data. Information such as “number” is included. At the time of reproduction, the decoding unit 101 can reproduce and acquire the management information data in FIG. 3 before the encoded moving image data (stream). During reproduction, it is possible to monitor the progress of the stream and the timing of the I picture by comparing the I picture information acquired in advance with the reproduced I picture. If an error occurs during playback, the decoding of the I picture is resumed after the error occurs by searching the position of the next and subsequent I pictures from the information of the frame that can be decoded immediately before the error. Can do. It should be noted that the address indicating the recording position of the I picture on the storage medium 107 shown in FIG. 3 can be any address where the recording position of the corresponding I picture on the storage medium 107 can be known, such as an offset address from the beginning of the file. Good.

  Next, an outline of the reproduction operation will be described with reference to FIG. FIG. 6 is a diagram showing the decoding timing and display timing of each frame image of the encoded moving image data. Reference numerals 600 and 601 denote GOP (Group Of Pictures) of the encoded moving image data stored in the storage medium 107, each of which is composed of a combination of 15 pictures from I2 to B13. In the figure, I, B, and P represent picture types, and the numbers on the right represent the display order (the top is 0). Reference numeral 602 denotes timing for decoding each frame of the encoded moving image data (GOP) 600. Reference numeral 603 denotes the timing for displaying the decoded frame image. In the example shown in the figure, the display timing is delayed by two frames from the decoding. Reference numeral 604 denotes a timing for displaying the playback time and the frame number. FIG. 6 shows an example in which only the frame number is displayed, and it is assumed that the frame number 1 is started. The playback time is calculated and displayed based on the frame number as described above.

  When an instruction to start reproduction is given from the operation unit 103, the control unit 100 reads the management information file from the storage medium 107 via the storage medium I / F 106 and stores the management information data in the RAM unit 102. Further, the encoded moving image data 600 and 601 are sequentially read and stored in the RAM unit 102. When the encoded moving image data is stored in the RAM unit 102, the control unit 100 instructs the decoding unit 101 to decode the encoded moving image data stored in the RAM unit 102. The decoding unit 101 decodes the encoded moving image data, and stores the generated frame image in the RAM unit 102. The control unit 100 instructs the display unit 104 to display a frame image when it is time to display the frame image stored in the RAM unit 102. The decoding is performed with I2 and B0 in FIG. 6, and the first display timing is immediately after the frame image of B0 to be displayed first is stored in the RAM unit 102, and the display unit 104 is instructed to display the frame image of B0. To do. At the same time, the number of frame images to be displayed is counted, the reproduction time is calculated from the frame number, and the display unit 104 is instructed to display the reproduction time and the frame number. The display unit 104 displays a frame image, a reproduction time, and a frame number. A series of operations from reading the encoded moving image data to displaying the frame image, the reproduction time and the frame number is instructed to stop reproduction from the operation unit 103 or the frame images of all the encoded moving image data This is done until is displayed.

  Next, the operation when an error occurs during reproduction will be described with reference to FIG. FIG. 7 is a diagram showing the decoding timing and display timing of each frame image when an error occurs. Reference numerals 600 and 601 in FIG. 7 are the same as the encoded moving image data described in FIG. Reference numeral 605 denotes timing for decoding each frame of the encoded moving image data (GOP) 600. Reference numeral 606 denotes the timing for decoding the searched I picture when an error occurs. Reference numeral 607 denotes a timing at which reproduction is resumed after recovery from an error, and first, the encoded moving image data (GOP) 601 is decoded after the resume. Reference numeral 608 denotes the timing for displaying the decoded frame image. Reference numeral 609 denotes a picture that is an error target at the time of decoding (a frame including data that has an error). In this example, an error has occurred in the picture P8. Reference numeral 610 denotes the timing for displaying the playback time and the frame number. FIG. 7 shows an example in which only the frame number is displayed, and it is assumed that the frame number 1 is started. The playback time is calculated and displayed based on the frame number as described above.

  The embodiment of the present invention can be applied to reproduction of encoded moving image data that does not include time stamp information such as encoding time and display time in the encoded moving image data. When an error occurs in encoded video data that does not include time stamp information, it is important to minimize the disturbance of the image in error and to recover from the error (search for the playback resume position). is there. Therefore, when the decoding unit 101 detects an error at the time of decoding, the control unit 100 continues to display on the display unit 104 the image of the frame immediately before the error that has been normally decoded, the playback time and the frame number of the frame. To instruct. The display unit 104 displays the instructed frame image, playback time, and frame number. Taking FIG. 7 as an example, when the error picture 609 occurs, the last frame image that has been successfully decoded and displayed immediately before is the P5 frame image, so the P5 frame image, its playback time, and frame number Will continue to be displayed.

  Further, the control unit 100 searches for the next I picture from the address, size, and frame number of the I picture included in the management information data stored in the RAM unit 102 and the frame number that has been successfully decoded, The I picture data is read from the storage medium 107. Then, the read I picture data is stored in the RAM unit 102. The control unit 100 instructs the decoding unit 101 to decode the I picture, and the decoding unit 101 decodes the data of the I picture. In the example of FIG. 7, since the frame image of P5 is displayed when an error occurs, the I2 picture of the encoded video data (GOP) 601 that is the next I picture is searched, and the data of the I2 picture is read out. Stored in the RAM unit 102. Thereafter, the read I2 picture is decoded at the timing 606. The control unit 100 determines whether there is an error in the I picture as a result of decoding. If there is an error, search for the next I picture, decoding, and error determination are performed. Repeat the same operation until the error disappears. In the example of FIG. 7, there is no error in the decoding result of the I2 picture of the encoded moving image data (GOP) 601, but when there is an error, a plurality of different I pictures are decoded at the timing of 606. Are continuously executed.

  When there is no error, the frame number of the I picture with no error is held, and playback is resumed from that position. At the timing 607 for displaying the resumed frame image, the display of the last frame image before the occurrence of the error that has been displayed since the occurrence of the error is terminated, and the frame image that has been resumed is displayed. In the example of FIG. 7, at the time of 607, normal reproduction display is performed from I2 of the encoded moving image data (GOP) 601 in place of the P5 frame image displayed so far. At this time, in order to resume reproduction from the I2 frame image of the GOP 601, the B0 and B1 pictures in the GOP 601 are not decoded, but decoding is performed with the P5, B3, and B4 pictures next to I2. After the reproduction of the I2 frame image of the encoded moving image data (GOP) 601 is started, the display of the reproduction time and the frame number together with the I2 frame image is resumed on the display unit 104 to update sequentially.

  Note that the I2 picture of GOP 601 has already been decoded at the timing 606 and stored in the RAM unit 102. Therefore, at the timing 607, if the data in the RAM unit 102 can be read, the decoding is not performed again. Also good.

  In the above example, when an error occurs, the subsequent I pictures are searched one by one in order. However, the search interval may be changed during the search according to the number of consecutive errors. For example, the I picture is searched one by one as described above up to the ninth after the error occurs, and when the error occurs up to the tenth time, the 20th I picture is searched next. The I picture search interval may be increased in the middle according to the number of consecutive errors.

  FIG. 5 is a flowchart of the reproduction operation of the moving image reproduction apparatus according to the embodiment of the present invention. This flowchart shows a moving image reproduction method executed in accordance with a control program executed by the control unit 100. In step S500, it is determined whether or not an instruction to start reproduction is given from the operation unit 103. If it is determined that the reproduction is to start, the process proceeds to step S501. If not, the process returns to step S500 to enter a standby state.

  In step S501, the management information file is read from the storage medium 107, the management information data is stored in the RAM unit 102, and the process proceeds to step S502. In step S502, based on the management information data, a point at which playback is instructed or an I picture in the vicinity thereof is acquired as an offset frame, and the process proceeds to step S503. When reproduction is performed from the beginning of the encoded moving image data, the offset is zero.

  In step S503, it is determined whether there is data to be read from the encoded moving image data recorded in the storage medium 107. If it is determined that there is data to be read, the process proceeds to step S504; otherwise, the process proceeds to step S505. Whether there is data to be read is determined based on whether there is unreproduced encoded moving image data and the RAM unit 102 has a free space. In step S504, the encoded moving image data is read from the storage medium 107, stored in the RAM unit 102, and the process proceeds to step S505.

  In step S505, it is determined whether data to be decrypted is in the RAM unit 102 or not. If there is data to be decrypted, the process proceeds to step S506, and if not, the process proceeds to step S507. Whether or not the data to be decoded exists in the RAM unit 102 is determined based on whether or not the undecoded data exceeds a certain amount (for example, whether or not the undecoded data is 1 GOP or more). In step S506, the encoded moving image data is decoded, the generated frame image is stored in the RAM unit 102, and the process proceeds to step S507.

  In step S507, it is determined whether an error has occurred during decoding of the encoded moving image data. If it is determined that there is no error, the process proceeds to step S508, and if it is determined that there is an error, the process proceeds to step S511. In step S508, it is determined whether to update the display frame. If it is determined to update the display frame, the process proceeds to step S509; otherwise, the process proceeds to step S510. Whether to update the display frame is determined by displaying the currently displayed frame for the display time (30 frames per second, which is a typical frame rate in NTSC, is 30 frames per second, so 1/30 = about 33 ms). In addition, it is determined that the next frame to be displayed has been decoded.

  In step S509, the frame image, the reproduction time, and the frame number are displayed (display update). Here, the frame number of the frame to be displayed is held, and the process proceeds to step S510. In step S510, it is determined whether or not the reproduction is finished. If it is determined that the reproduction has ended, the flow ends. Otherwise, the process returns to step S503. The end of reproduction occurs when a reproduction stop instruction from the operation unit 103 is received or when encoded moving image data being reproduced is terminated.

  In step S511, it is determined whether or not the last I picture data of the encoded moving image data has been decoded. If the last I picture has not been decoded, the process proceeds to step S512. If the last I picture has been decoded, the reproduction operation is stopped and the flow ends.

  In step S512, the position of the subsequent I picture data in the encoded moving image data existing after the error occurrence time is searched, and the process proceeds to step S513. The subsequent I picture search is performed based on the management information data in the procedure described above. In step S513, I picture data in the encoded moving image data extracted by the search is read from the storage medium 107, stored in the RAM unit 102, and the process proceeds to step S514. In step S514, the read I picture data is decoded, and the process proceeds to step S515.

  In step S515, it is determined whether an error has occurred during decoding of the I picture data in step S514. If it is determined that there is an error, the process returns to step S511 to enter a flow for searching for the next and subsequent I pictures. If it is determined that there is no error, the process proceeds to step S516. In step S516, the I picture for which no error has been detected is determined as the position at which reproduction is resumed when returning from the error, the frame number at which reproduction is resumed is set, and the process returns to step S503. Thereafter, the frame image, the reproduction time, and the frame number are updated in step S509 based on the I picture at the reproduction resume position set in step S516 and its frame number. The above is the description of the flowchart of FIG.

  Next, an operation for changing the I picture search method according to the recording alignment, which is the recording unit of the storage medium, will be described as a modified example related to the I picture search when an error occurs during reproduction.

  FIG. 4 is a diagram showing the relationship between the recording alignment in the storage medium 107 and the encoded moving image data stored in the storage medium 107. In FIG. 4, reference numeral 400 denotes the size of the recording alignment, and the recording alignment sizes of the same size are arranged. A FAT (File Allocation Table) method is used as a recording format for the moving image reproducing apparatus according to the present embodiment to record data on a storage medium. The FAT system is a general recording format such as a video camera. The recording alignment indicates a unit of writing in the FAT system, and includes RU (Recording Unit) or AU (Access Unit).

  In FIG. 4, 401 is encoded moving image data stored in the storage medium 107. A black portion 402 in the encoded moving image data 401 is an I picture in the encoded moving image data, and indicates that a plurality of I pictures exist in one recording alignment. Such a state often occurs when low-bit-rate encoded moving image data is recorded. By determining at which address on the storage medium 107 the I picture in the encoded moving image data is located, it is possible to determine which recording alignment the I picture belongs to.

  The control unit 100 includes a recording alignment detection unit that detects the recording alignment of the storage medium 107. The control unit 100 acquires the size of the recording alignment of the storage medium 107 via the storage medium I / F 106 by the recording alignment detection unit before the start of reproduction.

  When an error occurs during reproduction, the control unit 100 determines at which address of the encoded moving image data on the storage medium 107 the error has occurred, and further determines which recording alignment the address belongs to. The control unit 100 searches for the first I picture from the position of the next recording alignment of the recording alignment in which the error has occurred, reads the I picture data from the storage medium 107, and stores it in the RAM unit 102. Then, the decoding unit 101 is instructed to decode the read I picture data, and the decoding unit 101 decodes the I picture data. The control unit 100 determines whether there is an error in the decoding result. If there is an error, the first I picture is searched from the position of the next recording alignment, and the I picture read out there is decoded. The same operation is continued until there is no error, and finally an I picture without an error can be determined as the reproduction restart position.

  An example of searching for an I picture in such a recording alignment unit is realized by modifying the processing steps of steps S501 and S512 of FIG. In step S501, an operation of acquiring recording alignment by the recording alignment detection unit is added. In step S512, the address and recording alignment on the storage medium 107 of the encoded moving image data in which an error has occurred may be acquired and changed to search for the first I picture of the next recording alignment.

  Since a data error often occurs in a unit of writing data to a storage medium, a method of acquiring and using recording alignment is effective in terms of speeding up recovery from the error.

  As described above, according to the present embodiment, even if an error occurs during reproduction of encoded moving image data that does not include time stamp information, it is possible to determine which frame image is being reproduced after recovery from the error. The correct time information can be displayed.

DESCRIPTION OF SYMBOLS 10 Moving image reproducing apparatus 100 Control part 101 Decoding part 102 RAM part 103 Operation part 104 Display part 105 ROM part 106 Storage medium interface 107 Storage medium 108 Bus

Claims (5)

A moving image reproducing apparatus for reproducing encoded moving image data not including time stamp information,
Reproducing means for reproducing the encoded moving image data from a storage medium;
Decoding means for decoding data reproduced by the reproducing means;
Display means for displaying a moving image and elapsed time information of the moving image based on the data decoded by the decoding means;
Error detection means for detecting an error in the data reproduced by the reproduction means;
Storage means for storing management information indicating a recording position of an intra-picture encoded picture included in the encoded moving image data;
When the error detection unit detects the error during reproduction by the reproduction unit, an intra-picture coded picture subsequent to the frame including the data having the error is based on the management information stored in the storage unit. Control means for searching and controlling to recover from the error,
The moving image reproducing apparatus according to claim 1, wherein when the error is restored, the display means updates the displayed elapsed time information based on a frame number of the intra-picture coded picture searched by the control means.   The control means searches for the subsequent intra-picture coded pictures in a predetermined order and causes the reproduction means to reproduce them, and sets the intra-picture coded pictures whose errors are no longer detected by the error detection means to the reproduction resume position. The moving image reproducing apparatus according to claim 1, wherein:   3. The moving image reproducing apparatus according to claim 2, wherein the control unit changes the search interval to be widened during the search according to the number of consecutive errors in the subsequent intra-picture coded picture.   The control means retrieves the subsequent intra-picture coded picture in a recording alignment unit that is a recording unit of the storage medium, causes the reproduction means to reproduce the intra-picture code in which no error is detected by the error detection means. 2. The moving picture reproducing apparatus according to claim 1, wherein the converted picture is set at a reproduction resuming position. A moving image reproduction method for reproducing encoded moving image data not including time stamp information,
A reproduction step of reproducing the encoded moving image data from a storage medium;
A decoding step of decoding the data reproduced in the reproduction step;
A display step of displaying a moving image and elapsed time information of the moving image based on the data decoded in the decoding step;
An error detection step of detecting an error in the data reproduced in the reproduction step;
A storage step of storing management information indicating a recording position of an intra-picture encoded picture included in the encoded moving image data;
If the error is detected in the error detection step during reproduction of the encoded moving image data, the subsequent intra-screen code of the frame including the error data is based on the management information stored in the storage step And a control step for controlling to recover from the error by searching for a categorized picture,
The moving image reproduction method according to claim 1, wherein when the error is recovered, the display step updates the displayed elapsed time information based on a frame number of the intra-picture coded picture searched in the control step.

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