JP2004282794A - Recording method and reproducing method for recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording method with which information relating to the number of frames per sec contained in a private packet and a storage address are utilized when reproducing a video packet from a recording medium. <P>SOLUTION: Digital information to be recorded on a recording medium (1) is composed of a private packet (14) containing control information and a video packet (17) containing video information as units, the private packet (14) is disposed before the video packet (17), and information (21) relating to the number of frames per sec in the video information of the video packet (17) and a storage address (25) for each picture stored in the packet are recorded in the private packet (14). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording method and a reproducing method of a recording medium, and more particularly to a high-density recording / reproducing of an optical disk.

  FIG. 27 is a block diagram of a conventional optical disk recording / reproducing apparatus disclosed in Patent Document 1 below. In the figure, reference numeral 40 denotes a video A / D converter for converting a video signal into digital information; 41, video information compression means; 69, a frame sector conversion for converting the compressed video information into sector information equal to an integral multiple of a frame period. Means, 70 is an encoder, 71 is a modulator for converting to a predetermined modulation code to reduce intersymbol interference on a recording medium, 72 is a laser drive circuit for modulating a laser according to the modulation code, 73 is a laser Output switch.

JP-A-4-114369

  76 is an optical disk, 74 is an optical head that emits laser light, 75 is an actuator that tracks the light beam emitted from the optical head 74, 78 is a traverse motor that sends the optical head 74, 77 is a disk motor that rotates the optical disk 76, 79 is a motor drive circuit, and 80 and 81 are motor control circuits.

  Reference numeral 82 denotes a reproduction amplifier for amplifying a reproduction signal from the optical head 74; 83, a demodulator for obtaining data from a recorded modulation signal; 84, a decoder; 85, a frame sector reverse conversion means; The information decompression means 87 is a D / A converter for converting the decompressed information into an analog video signal.

FIG. 23 is a diagram showing a simplified data arrangement structure (layer structure) of the MPEG system, which is being standardized for compressing, transmitting and storing digital moving image information. GOP 60 is a GOP layer composed of several pictures (screens), 61 is a slice obtained by dividing one screen into several blocks, 62 is a slice layer composed of several macroblocks (MB), 63 is a block layer composed of 8 pixels × 8 pixels.

  FIG. 24 is a diagram showing a coding structure when 15 screens are 1 GOP. 66 is an I picture which is video information for performing DCT in a frame, and 68 is video information by DCT coding which performs forward motion compensation. P picture 67 is a B picture to be subjected to DCT coding with motion compensation using the I picture 61 and the P picture 68 positioned before and after in time as reference screens.

  FIGS. 25 (a) and 25 (b) show a case where the amount of video data in one GOP has a variable structure in order to make the image quality between each GOP constant, and a case where the video data amount has a fixed rate in order to make the recording time constant. FIG.

  FIG. 26A is a diagram showing the data amount per GOP when the image quality per GOP is kept the same. Α represents the maximum value of the data rate, and β represents the average data rate. FIG. 26B is a diagram comparing the image quality and data amount per GOP in each of the images (e), (d), and (c).

  Next, the operation of the conventional example will be described. As digital video information compression technology advances, recording the above compressed information on an optical disk realizes an extremely easy-to-use video filing device with better searchability compared to conventional tape media such as VTRs. It is possible to do. In addition, since such disk file devices handle digital information, they do not suffer from dubbing degradation compared to recording analog video signals, and since they use optical recording / reproduction, a non-contact and highly reliable system is realized. it can.

  Conventionally, when such compressed moving image information is recorded on an optical disk, a method of recording digital compressed moving image information such as the MPEG system shown in FIG. 23 on the optical disk 76 shown in the block circuit diagram of FIG. 27 is used. . At this time, the video information digitized by the video A / D converter 40 is converted by the video information compression means 41 in a standard compressed moving image system such as MPEG. The compressed video information is encoded and modulated to reduce the influence of intersymbol interference of the optical disk, and is recorded on the optical disk 76. At this time, for example, it is clear that editing or the like in GOP units can be performed by setting the data amount in each GOP unit to be substantially the same and allocating the data to sectors equal to an integral multiple of the frame period.

  At the time of reproduction, the video information recorded on the optical disk 76 is reproduced by the optical head 74, amplified by the reproduction amplifier 82, restored to digital data by the demodulator 83 and the decoder 84, and then subjected to frame sector reverse conversion. Means 85 restores the data as pure video original data from which data such as address and parity has been removed. Furthermore, the information is expanded into a video signal by performing, for example, MPEG decoding by the information decompression means 86, and is converted into an analog video signal by the D / A converter 87 and can be displayed on a monitor or the like.

  As described above, when the MPEG method is used as a digital moving image compression method, as shown in FIG. 24, an I picture 66 for performing compression by intra-frame DCT and a video by DCT coding for performing forward motion compensation as shown in FIG. An encoding structure in which a P picture 68 as information and a B picture 67 in which DCT encoding is performed by performing motion compensation using the I picture 66 and the P picture 68 positioned before and after in time as a reference screen are combined. Is recorded on the optical disk 76 as it is.

  Of these pieces of information, the I picture 66 performs intra-frame DCT, so that it is possible to perform image reproduction using this information alone. However, the P picture 68 performs forward motion compensation. The image cannot be reproduced unless the picture 66 is reproduced, and since the B picture 67 is a predicted screen from both directions, it must be reproduced after the preceding and succeeding I picture 66 or P picture 68. If you can not play. Of these pieces of information, the B picture 67 for which bidirectional prediction is performed has the least amount of data and has good coding efficiency.

  However, since the B picture 67 cannot be reproduced independently, the I picture 66 and the P picture 68 are required. However, if the number of the B pictures 67 is increased, the amount of buffer memory in the processing circuit is increased, and the data input is reduced. There is a problem that the delay time until video reproduction increases. However, in a storage medium represented by an optical disk or the like, an encoding method with high compression efficiency is desired for long-time recording. On the other hand, the delay time of the video reproduction does not cause much problem. 24 is suitable.

  Next, when video data is recorded on one optical disc so that the image quality is constant in any part, a variable rate structure as shown in FIG. 25A is obtained. This is because when the image quality per GOP is constant, the amount of video data required for one GOP varies as shown in FIG. This is because, for example, in the case of a fine image, when the data amount required for an I picture increases, or when fast-moving video data continues, the compression efficiency of a P picture or a B picture does not become very high. . Also, as a matter of course, as shown in FIG. 26 (b), when the data amount per GOP is increased, the S / N of the image is improved though it differs depending on the picture.

  On the other hand, in order to keep the recording time of one optical disc constant, a format for recording at a fixed rate shown in FIG. 26B is suitable. However, unlike a magnetic tape medium, in the case of a video recording / reproducing apparatus using an optical disk medium, the total data amount per package is small, so that the compression efficiency must be as high as possible while maintaining high image quality. To this end, it goes without saying that the variable rate method shown in FIG. 25A has a higher file efficiency of video data per optical disc.

  Therefore, for example, in a read-only optical disk device, it is possible to know the data amount distribution of the entire optical disk at the time of variable rate by encoding in advance, so that the entire data distribution is adjusted at the second encoding. As a result, it is possible to adjust the reproduction time per disc even at a variable rate.

  As described above, in the conventional optical disc video recording system, the file efficiency of video data recorded on one optical disc medium is improved by making the data rate per GOP variable. In the case of an optical disk medium having a significantly smaller total data amount than that of a conventional optical disk medium, there has been a demand for a file method having a higher compression efficiency than before.

  In general, movie frames are fixed at 24 frames / sec. And NTSC signals are fixed at 30 frames / sec. Could not handle video sources, etc.

Further, when video sources having a plurality of frame rates are mixed on one disc, there is no control information required for displaying the video sources on a screen, and therefore, only a video of a part of a prescribed frame rate can be displayed. Also, there is a problem that even if the frame rates are different, it is not possible to smoothly access video data related to each other.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to enable a video recording / reproducing method with high compression efficiency.

  Another object of the present invention is to provide a recording method that can use information on the number of frames per second and a storage address included in a private packet when reproducing a video packet.

The present invention
The reference picture is an I picture that is video information subjected to intra-frame DCT, a P picture that is video information obtained by DCT coding that has been subjected to forward motion compensation, and the I picture and P picture that are temporally located before and after. In a recording method for recording video information including a B picture, which is video information by DCT coding with motion compensation performed thereon, and digital information including control information of the video information on a recording medium,
The digital information is configured in units of a video packet including the private packet including the control information and the video information,
The private packet is arranged before the video packet,
A recording method of a recording medium, characterized in that information about the number of frames per second in video information of the video packet and a storage address of the picture stored in the packet are recorded in the private packet. It is.

  A video recording method according to another aspect of the present invention comprises a video scene related to the video scene of the digital video information, in addition to the digital video compression information for normal reproduction which can be displayed in a predetermined number of frames required for television screen display. Further, another interpolated digital compressed video information having a larger number of frames per second than the above-mentioned predetermined number of frames is recorded on a disk.

  According to another aspect of the present invention, there is provided a video recording method in which a first additional data area is provided adjacent to normal reproduction digital video information, and there is extended digital video information corresponding to the video scene of the normal reproduction digital video information. A flag indicating whether or not the interpolation digital video information is present on the disc; first address position information indicating a location of the interpolation digital video information on the disc; a data size of the interpolation digital video information; and a reproduction speed for reproducing the interpolation digital video information. It was made.

  According to another aspect of the present invention, there is provided a video recording method, wherein a second additional data area is provided adjacent to extended digital video information, and the location of a normal reproduction digital video information on a disc to be accessed after the extended digital video information is reproduced. , And information indicating the existing address position of each picture in the interpolated digital video information.

  According to another aspect of the present invention, there is provided a video reproducing method comprising the steps of: when reproducing digital video information for normal reproduction recorded on a disc according to claims 1 or 2, in response to an instruction from an operator, the first additional data; In accordance with the address information, the optical head is made to access the sector of the disk on which the interpolated digital video information corresponding to the video scene of the digital video information for normal reproduction is written, and the interpolated digital video information is reproduced at a low speed. This is to return to the original recording position of the digital video information for normal reproduction based on the address information in the additional data.

  A video recording / reproducing method according to another aspect of the present invention compresses digital video information based on motion estimation information between frames or fields that are temporally adjacent to each other at the time of recording. The number of frames per second is reduced according to the change in the luminance signal or the change in the chrominance signal, and is recorded on a recording medium. It is intended to secure a large number of frames.

  A video recording / reproducing method according to another invention of the present invention is a method for recording and reproducing digital video information corresponding to several to several tens of screens other than the video information provided at the head of a video information unit. In the area where the control information is described, the number of reduced frames at the time of recording the information of the disc, which is the control information necessary for the overlapping display, and the overlapping display method of the previous and next screens at the time of reproduction are recorded. Video data on a disk whose frame rate fluctuates based on control information is converted into a frame rate required for a predetermined television display and displayed.

  In the video recording / reproducing method according to another aspect of the present invention, when the content of control information for controlling a frame rate to a predetermined value is the same over a plurality of video information units, the first video information unit The control information is described at the head, and thereafter, only when the content of the control information is changed, the changed content of the control information is described.

  According to a video recording / reproducing method of another invention of the present application, video information recorded on a recording medium is video information in units of frames, and an I picture which is video information to be subjected to DCT in a frame and a motion compensation in a forward direction are performed. From several frames in which P pictures, which are video information obtained by DCT coding to be performed, and B pictures to be subjected to DCT coding with motion compensation performed using the I picture and P picture located before and after in time as reference screens, are mixed. A video data block which is a succession of video information blocks in units of several tens of frames and which corresponds to a B picture excluding the header portion of the image data according to the movement of the screen or the change of the luminance signal or the change of the color signal is deleted. In the header portion, which field of the deleted screen is to be overlapped is written.

  A video reproducing apparatus according to another aspect of the present invention recognizes an optical disk on which digital video information is recorded, an optical head for reading information on the optical disk, and flag information indicating whether or not there is interpolation video information for low-speed reproduction. When there is interpolation video information for low-speed playback, interpolation information read control means for controlling the reading of the interpolation information based on the interpolation information address and interpolation information size recorded on the optical disc, and at the time of normal playback, It is provided with a temporal reference conversion control means for converting a discontinuous temporal reference value to be continuous according to an interpolation information rate indicating a low-speed reproduction rate.

  According to the recording method of the recording medium according to the present invention, the video packet is reproduced after reading the private packet including the information on the number of frames per second and the storage address of each picture. The information on the number of frames per second and the storage address included in the private packet can be used.

  Further, according to the video recording method according to the present invention, it is possible to file a video stream having a higher time resolution than the number of frames in normal playback defined by the display operation of the television, so that the motion analysis in sports, Practicality is improved in all fields such as education and games.

  Further, according to the video recording method of the present invention, the normal reproduced video data and the video data with high time resolution (interpolated digital video information) are arranged in different portions on the optical disk, and the address information is stored in the normal video data. Is written in the area where is recorded, so it is possible to instantly call up a video file with a high time resolution related to the above-mentioned normal playback video data, and also write the playback speed of the video information with a high time resolution. Since the setting can be made, the user does not need to set while watching the video, and the convenience is improved.

  Further, according to the video recording method of the present invention, when the reproduction of the video data with high time resolution is completed, the return address to the original normal reproduction stream is written, so that the video stream is immediately returned to the original stream. In addition, since the start address value of each picture is recorded, it is easy to take out the video data with high time resolution into the buffer memory of the playback device and then take out the data from the memory.

  Further, according to the video reproducing method according to the present invention, it is possible to access the video data for normal reproduction in association with the video data having a high time resolution, so that it is possible to automate the data access control of the optical disc. It becomes possible.

  Further, according to the video recording / reproducing method according to the present invention, the number of frames is made variable in accordance with the movement of the image, so that the file efficiency of the video data is improved and the data distribution to the video which is more difficult to compress is increased. Thus, video recording and reproduction for a longer time can be performed.

  Further, according to the video recording / reproducing method according to the present invention, a video decoding method of a variable picture rate is written in a video information unit in which a plurality of video data are put together, so that the video data for which motion prediction compensation is performed is Control can be performed at the same time interval as the decode control information of other video data.

  Further, according to the video recording / reproducing method according to the present invention, control data is written only when the decoding content of the variable picture rate is changed and at the very first time, so that the video data is written in units of the video information. The number of times the control operation is repeated according to the content of the control information is reduced, and the operation of the controller is simplified.

  Also, according to the video recording / reproducing method according to the present invention, when decoding video information written at a variable picture rate, it is possible to display the screen in units of fields, so that the first field and the second field can be displayed. It is possible to alleviate the irregularity of the temporal display of the screen display caused by the repetition of the above and the awkwardness of the screen due to the variation of the time interval between the fields.

  According to the video reproducing apparatus of the present invention, by separating the video stream into basic image information and interpolated image information, the temporal reference value defined by the MPEG standard becomes discrete. Is provided, a video reproducing apparatus capable of obtaining an MPEG stream without departing from the range of the MPEG standard can be configured, and the interpolation information reading control means makes the basic image and the interpolated image discontinuous. Video stream can be played back as a continuous stream.

Embodiment 1 FIG.
FIG. 1 is a flowchart showing a decoding method when the control information according to the first embodiment of the present invention is inserted into user data of a video stream. FIG. 2 is a block circuit diagram showing the configuration of the optical disk reproducing apparatus according to the first embodiment, wherein 1 is an optical disk, 2 is a reproducing amplifier, 3 is a demodulator, 4 is error correction means, 5 is temporal reference control means, and 6 is temporal reference control means. A buffer, 7 is a decoding means, 8 is a D / A converter, 9 is a reproduction control means, 10 is an optical head control means, and 11 is an interpolation information reading control means. The playback control means 9 receives a playback speed request signal indicating normal playback, 1/2 times or 1/4 times playback, and sends this signal to the temporal reference conversion control means 5.

  During normal playback, the temporal reference conversion control means 5 multiplies the value of the temporal reference by 1/4 and processes the value. In addition, at the time of 1/2 times slow reproduction, the value of the temporal reference is halved and processed. Also, at the time of 1/4 times low-speed reproduction, processing is performed with the value of the temporal reference as it is. Further, the reproduction control means 9 performs the reset / set processing of the temporal reference to the decoding means 7 at the change point of the reproduction mode.

  The interpolation information reading means 11 interpolates the interpolation information recorded in a specific area of the optical disc 1 according to the reproduction mode and the interpolation information flag, interpolation information start address, interpolation information size, and interpolation information rate recorded in the user area of the GOP layer. The optical head is controlled via the optical head control means 10 in order to read information.

  FIG. 3 shows a flowchart at the time of normal reproduction. First, when the reproduction is started, it is checked from the interpolation information flag whether interpolation information is present. If there is this interpolation information, the temporal reference value is not continuous during normal reproduction. For this purpose, the interpolation information rate is read, and conversion is performed so that the temporal reference is continuous. Taking FIG. 1 as an example, this can be achieved by multiplying the temporal reference value by 1/4.

  FIG. 4 shows a flowchart at the time of low-speed reproduction. First, when the reproduction is started, the operation according to the flow at the time of the normal reproduction described above is performed. When the low-speed reproduction request signal is input, it is first checked whether or not there is interpolation information. If not, normal low-speed playback is performed. In some cases, temporal reference conversion is performed. Then, the interpolation information is read, and a video stream is formed on a low-speed reproduction buffer together with the basic information. After that, this stream is sent to the decoding means, where it is decoded and reproduced.

  FIG. 5 is a diagram showing a system stream for normal reproduction according to the first embodiment. In the figure, a pack header (abbreviated as "PH" in the figure) 12 stores additional information for referring to a time reference for synchronous reproduction, and a system header (abbreviated as "SH" in the figure) 13 It is added to the pack at the beginning of the program and describes and stores the outline of the entire stream. A private 2 packet (abbreviated as “P2P” in the figure) 14 stores packet data, an audio packet (abbreviated as “AP” in the figure) 15 stores audio data, and a character packet (abbreviated as “AP” in the figure) Character data is stored in a CP 16 and video packets (abbreviated as “VP” in the figure) 17 are video data.

  The private 2 packet 14 stores the following control information, and stores an information flag (abbreviated as “IF” in the drawing) 18 indicating the presence or absence of an interpolation system stream in which interpolation frame information is stored, and an interpolation system stream. Address (abbreviated as “IA” in the figure) 19 indicating the address of the pack that has been inserted, information size (abbreviated as “IS” in the figure) 20 indicating the information size of the pack storing the interpolation system stream, and interpolation A packet rate (abbreviated as "PL" in the figure) indicating the picture rate of the video information of the system stream (abbreviated as "PR" in the figure) 21 or the like is stored prior to this. 22, a packet start code (abbreviated as “PS” in the figure) 23 indicating the start of a packet. The pack stores video information of one GOP, and the pack header 12 at the start point is arranged at the head of a sector which is a unit of access to an optical disk or the like.

  FIG. 6 is a diagram showing a system stream for low-speed reproduction according to the first embodiment. In the figure, a private 2 packet 14 has a packet start code 23 and a return address value indicating a head position of a pack including video information for normal reproduction corresponding to the video information for low-speed reproduction ("RA" in the figure). ), And picture address data (abbreviated as “PAD” in the figure) 25 indicating the storage address of each picture stored in the packet.

  FIG. 7 is a diagram showing a storage arrangement of stream information on the optical disc 1 according to the first embodiment. In the figure, a TOC (table of contents) 26 is an area in which a start sector address of a program, that is, a title, is written, and is read immediately after startup, and 27 is a pack in which video information of one GOP shown in FIG. 1 is stored. , An area in which system stream information for normal reproduction is recorded, and a pack 28 in which video information for low-speed reproduction is recorded.

  A pack in which video information for low-speed reproduction is recorded is concentrated on a specific area on the optical disc 1 as shown in FIG. 7, or a pack for normal reproduction as shown at 28 (b) in FIG. There is a method of recording after pack information, that is, a method of alternately recording a normal reproduction pack and a low-speed reproduction pack. FIG. 8 is a conceptual diagram showing a video stream (a) for normal reproduction and streams (b) and (c) for interpolation information. FIG. 9 is a diagram showing which field is selected and reproduced in a stream having a large number of frames.

  Next, the operation of the first embodiment will be described. FIG. 1 is a data flowchart in the GOP layer in the MPEG standard. In the figure, the group start code indicates the start code of the GOP, the time code indicates the time from the beginning of the sequence, the closed GOP flag indicates that the images in the GOP can be reproduced independently of other GOPs, and the broken link The flag indicates that the preceding GOP data cannot be used for editing, the extension start code indicates the start of the group extension area, the group extension data indicates the group extension data, and the user data start code indicates the start of the user data area. , The user data indicates data in the user data area, and the picture layer indicates attributes common to one screen.

  GOP is an abbreviation of Group of Picture, and is the minimum unit of a screen group that is a unit of random access. Here, the user data is an area in which the user may freely insert data. In the first embodiment, whether or not interpolation information is present in this area, that is, using the interpolation information, Interpolation information flag indicating whether low-speed reproduction is possible, interpolation information start address indicating the start address of the area where the interpolation information is stored, and interpolation information indicating the size of the interpolation information Four areas of a size and an interpolation information rate indicating the picture rate at which the image information including the interpolation information is captured are defined.

  The interpolation information is generated only at the low-speed playable portion, and there is no need to encode all the image information recorded on the optical disc by the method according to the present invention. Interpolation information of only a portion where high-speed reproduction is necessary such as a scene to be followed may be recorded on the optical disc. Therefore, the recording area for the interpolation information can be considerably lower than the area for recording the basic information. Since the presence / absence of the interpolation information is described by the information flag 18 in the control information in the two private packets, the presence / absence of the interpolation information can be automatically determined in the player. Can be displayed on the screen and the operator can select it.

  Further, since the interpolation information start address is described in the control information in the two private packets, it is possible to instantaneously access the interpolation information recording area on the optical disk. In FIG. 5, since the return address is described in the private 2 packet 14, it is possible to instantly return to the original normal playback video. Further, since the address of each picture is written in the private packet 14 of FIG. 5, after the data is read, the data can be smoothly read from the buffer memory of the player.

  Here, a method of compressing and encoding general digital image information is as follows. As described above, there are three compressed picture types, “I”, “P”, and “B”. The "B" type interpolation information is used at the time of low-speed reproduction. This is for two reasons. The first is that the B picture type has the smallest amount of information among the three types, and the interpolation information recording area can be reduced. Second, since the interpolation information is a low-speed playback image, the degree of change is small and the correlation is high in continuous screens, so that high image quality can be maintained without using “I” or “P” type pictures. is there. Naturally, when decoding the interpolation information, the I picture and the P picture in the original normal reproduction video data are used to decode the B picture of the interpolation information, or the interpolation information itself includes the I picture necessary for decoding the B picture. And P-pictures.

  FIG. 8 is a diagram showing a recording position of the configuration of the encoded and compressed image information according to the first embodiment. In FIG. 8A, “I”, “P”, and “B” each represent an image type compressed by the MPEG method. “I” represents an I picture, and is generated on the screen encoded from information of only the I picture without using inter-frame prediction for reducing redundancy in the time direction. “P” represents a P picture and is a screen that can be predicted from an I or P picture. In general, the macroblock type in a P picture includes both an intra-frame prediction screen using no prediction memory and a forward inter-frame prediction screen using a prediction memory. “B” represents a B picture and is generated by bidirectional prediction. The number below the screen type is called a temporal reference and indicates the playback order of pictures.

  The number of frames per second of a normal NTSC TV signal is approximately 30 frames / second. On the other hand, the image used in the first embodiment is, for example, an image shot at 120 frames per second, or an animation similar thereto. If this is encoded at 30 frames / sec which can be handled by a TV receiver, the reproduced image is reproduced at a low speed of 1/4 times. Therefore, when this image information is reproduced at a rate of one frame per four frames, the image information is reproduced at a normal speed. Similarly, when reproduction is performed at a rate of one frame for every two frames, a half speed reproduction can be realized.

  The method of recording information on the optical disk will be described below. Assuming that the image information read out at the time of normal speed reproduction is the basic information and the image information read out only at the low speed reproduction is the interpolation information, the basic information records the normal image information as shown in FIG. Similarly to the above, recording is continuously performed on the recording area 27 provided on the inner periphery of the optical disc 1. In contrast, the interpolation information is collectively recorded in a recording area 28 (b) provided on the outer periphery of the optical disc 1.

  In the first embodiment, the basic information has a ratio of one out of four. Therefore, in the case of the NTSC system, the image captured at 120 frames / second is used. By reading b and the basic information, low-speed reproduction of 30 frames / sec is performed. In the case of 1/4 reproduction, low-speed reproduction of 30 frames / sec is performed by reading the interpolation information a, the interpolation information b and the basic information. I can do it.

  FIG. 8 is a conceptual diagram of low-speed reproduction according to the present embodiment. Here, the frame rate of a camera used for photographing is 120 frames / sec. In this case, on a monitor of 30 frames / sec, a low-speed playback image of 1/4 times (FIG. 8C) is reproduced at a rate of one out of every two images (FIG. 8 (C)). b)) Also, when the reproduction is performed at a ratio of one out of four images, a normal reproduced image is obtained.

  The MPEG-coded pictures include an I picture of an intra-coded picture, a P picture using a one-way prediction picture, and a B picture using a two-way prediction. With respect to the number of pictures (N) in a GOP and the cycle (M) in which I or P pictures appear, it is general to select N = 15 and M = 3. In the first embodiment, pictures used during normal playback are arranged in the same manner as in the conventional picture, and interpolation information pictures used only during low-speed playback are streams using many B types. This is because if a picture of a type other than B is used, the picture is not read out during normal reproduction, so that a picture for normal reproduction may not be formed. In FIG. 8, N = 60 and M = 12.

  In FIG. 8, unshaded pictures are pictures obtained from interpolation information and are not used during normal reproduction. In addition, since information captured at a high frame rate has a smaller inter-frame difference than normal information, the use of the B type having a small amount of information is effective also from the viewpoint of disk capacity. Therefore, the ratio of the B picture type per GOP is: B picture occupation ratio in interpolation information> B picture occupation ratio during normal reproduction.

  When reproducing the image information recorded on the optical disk 1 by the method of the first embodiment, a number indicating a reproduction order of the images called a reference value (hereinafter, referred to as a “temporal reference value”) becomes a problem. Taking the numbers below the screen type in FIG. 8A as an example, the temporal reference of the encoded video stream can be normally reproduced because it is arranged in order of 1, 2, 3, 4, 5,. In the case of FIG. 8C, the reproduction is performed at a low speed of 1/4. When only the basic information is reproduced, the temporal reference is located at a constant multiple of 1, 5, 9, 13,..., And thus may not be applied to a general decoder.

  In a general video reproducing apparatus, the number of frames per second is fixed to, for example, about 30 frames / second in NTSC. Therefore, in the case of low-speed reproduction, no matter how low the reproduction speed is, the time resolution is not improved. Only the reproduced image that was obtained was obtained. Therefore, in the first embodiment, a video material having a large number of frames per second captured by a high-speed camera or the like is encoded, and the number of frames decoded per second is changed according to the reproduction speed.

  FIG. 9 is a diagram showing a field reproduction method in normal reproduction according to the first embodiment. Normally, a frame in television is interlaced reproduction, and the first field and the second field constitute one frame. FIGS. 9A and 9B are views showing a reproduction field at the time of low-speed reproduction. At the time of normal reproduction, a field surrounded by a dotted line is reproduced. Therefore, the fields enclosed by the dotted line become the normal system stream, and the fields not enclosed become the interpolation system stream.

  As shown in FIG. 7 (b), such interpolation information can be arranged in another location on the optical disc by using only the interpolation information as another data stream, but FIG. 28 (a) , It is also possible to arrange it after the normal reproduction stream, for example, in GOP units. However, if they are arranged at the same location on the optical disk, it is necessary to increase the required buffer memory and improve the reading rate during normal reproduction. In addition, when interpolation information at another location on the optical disk is arranged, the access time when reproducing the interpolation information increases.

  Also, in the field reproduction method of FIG. 9A, the time interval of the field is not constant during normal reproduction, and the reproduced image becomes jerky during image reproduction. On the other hand, in the field reproduction method of FIG. The time interval of the field at the time of reproduction becomes constant, and a smooth reproduced image is obtained. In addition, since the interpolation information need not exist for the entire image, the present method can be used only in a place where low-speed reproduction is frequently requested.

Embodiment 2 FIG.
Next, a second embodiment of the present invention will be described. FIG. 10 is a diagram showing a video recording / reproducing method according to the second embodiment. FIG. 10 (a) is a diagram showing a screen type in a GOP of a normal video stream, and FIG. It is a figure which shows the screen type in the GOP of a video stream. Here, each frame of B2, B4, and B6 in the normal video stream is deleted, and at the time of reproduction, the immediately preceding frames B1, B3, and B5 are continuously reproduced at the position of the deleted frame. In this case, continuous playback is realized by freezing the playback image. Furthermore, by assigning the information amount of the deleted frame to another frame and re-encoding, higher image quality can be obtained, and the recording time corresponding to the deleted frame information amount can be increased.

  FIG. 11 is a diagram showing a structure of a video stream for realizing a screen freeze according to the second embodiment. In the figure, a picture header (abbreviated as “PCH” in the figure) 29 stores a start code of picture information and the like, and a picture coding function extension unit (abbreviated as “PCEX” in the figure) 30 is used for encoding. The expanded information is stored, and the quantization matrix function expansion unit (abbreviated as “QMFEX” in the figure) 31 stores the expanded information of the quantization matrix, and the picture display function expansion unit (in the figure, “PDEX” is abbreviated to the picture display function, and the picture space scalable function extension unit (abbreviated to “PSEX” in the figure) 33 stores the picture space scalable information. The picture temporal scalable function extension unit (abbreviated as “PTSEX” in the figure) 34 has the picture temporal scalable function extended. Broadcast is stored, (in the figure, abbreviated as "SLICE") slice layer slice is the minimum unit of a series of data strings having a start code 35 is stored.

  The picture coding function extension unit 30 further includes a top field first flag (abbreviated as “TFF” in the figure) 37 indicating whether the top field comes first in time, and a first field for telecine conversion. Are displayed, a repeat first field flag (abbreviated as "RFF" in the figure) 38 indicating whether or not to redisplay, and a progressive frame flag (abbreviated as "PF" in the figure) 39 indicating whether the format is the progressive format. These are all specified in the MPEG standard. By setting these three flags and the progressive sequence flag of the sequence extension unit defined by the MPEG standard, it is possible to set the reproduction of a frame or a field. FIG. 18 is a diagram illustrating a reproduction mode according to the flag setting according to the second embodiment.

  FIG. 12 is a block circuit diagram of the second embodiment. When an optical disc on which digital moving image information is recorded is created, a recorded image file in which the number of frames per second of digital image information is reduced is created. This is to improve the compression efficiency of digital video. In the figure, 40 is a video A / D converter, 41 is video information compressing means, 90 is a moving vector amount detecting means for detecting a moving vector amount, 91 is a frame drop amount determining means, 42 is a disk format encoder, and 43 is a modulation. Means, 44 is a recording data file, 45 is a ROM disk mastering device, 1 is a created ROM disk.

  FIG. 13 is a diagram showing how frames are dropped with respect to the motion vector amount in the second embodiment. FIG. 13 (a) shows that 24 frames / second and 30 frames / second are FIG. 13B shows a case where switching is performed between 30 frames / second, 27 frames / second, and 24 frames / second, respectively.

  The number of frames per second on the TV screen differs depending on the NTSC zone or PAL zone, but is 30 frames / second in Japan and the United States, for example. The number of frames to be displayed on the TV screen needs to correspond to the format of the TV system. However, the video data to be recorded on the optical disk does not necessarily need to file all the number of frames. It is possible to delete data in picture units within an inconspicuous range. In this case, when displaying a screen, a flag for repeatedly reproducing the previous screen is set in a header portion provided for each GOP composed of a plurality of pictures or a header portion provided at the head of picture data. By doing so, it is possible to respond.

  However, apart from the case of a movie film in which data is originally composed of 24 frames / sec, keeping the number of picture reductions per GOP unit constant may be noticeable depending on the picture when a frame is dropped. . Therefore, in the second embodiment shown in FIG. 12, the number of dropped frames is adaptively changed according to the speed of the screen movement.

  FIG. 19, FIG. 20, and FIG. 21 are diagrams showing the structure of a video stream for realizing a screen freeze according to the second embodiment. In the figure, a sequence header (abbreviated as "SH" in the figure) 46 is used for random access cueing, a GOP 47 is a group of several pictures collected, and a sequence header code (in the figure) , “SHC”) 48 is a code included in the sequence header 46 for identifying the sequence header, and a sequence extension section (abbreviated as “SQEX” 49 in the figure) 49 is included in the sequence header 46 to distinguish between MPEG1 and MPEG2. The sequence display extension unit (abbreviated as “SQDP” in the figure) 50 includes a sequence header 46 that stores a flag for performing a function related to display and the like, and the sequence scalable extension unit (in the figure, “SQDP”). SQSC) 51 is a flag included in the sequence header 46 for performing scalable extension. In the user data section (abbreviated as “UD” in the figure) 52, a user data start section (abbreviated as “UDSC” in the figure) 53 and user data (“USRDT” in the figure) are stored. Abbreviation) 54 is stored. The GOP 47 stores a GOP header (abbreviated as "GPH" in the figure) 55, user data 52, and a picture layer 56. The picture layer 56 stores a picture header (abbreviated as “PCH” in the figure) 57 and a slice layer 58.

  By writing information on the number of frames per second and which screen is to be frozen in any of the user data sections 52 in FIGS. 19, 20, and 21, playback control from the apparatus becomes easy.

  FIG. 22 is a diagram showing a method of deleting a field of a video material. In the case of a video material in which a movie material is subjected to telecine conversion, as shown in FIG. 22A, the deleted field 88 is supplemented by a temporally previous field 89. At this time, the flag setting states shown in FIG. 9 are such that the top field first flag 37 is 1, the repeat first field 38 is 1, the progressive frame flag 39 is 1 at the deleted field portion 88a, and the top field first flag is 88 at the deleted field portion 88b. The flag 37 becomes 0, the repeat first field 38 becomes 1, and the progressive frame flag 39 becomes 1.

  In the case of a movie (v cinema) shot by a video camera, as shown in FIG. 22B, the deletion field can be deleted to form a stream of information of 24 frames per second. At this time, each flag setting state shown in FIG. 9 is such that the top field first flag 37 is 0, the repeat first field 38 is 1 and the progressive frame flag 39 is 1 at the deleted field location 59c, and the top field first flag is 59 at the deleted field location 59d. The flag 37 is 1, the repeat first field 38 is 1, and the progressive frame flag 39 is 1.

  Next, the operation of the second embodiment will be described. In FIG. 12, the motion vector amount of the video report compressed by the video information compression unit 41 is extracted by the motion vector amount detection unit 90. In general, a motion vector code is assigned a smaller number of bits to a smaller motion and a larger number of bits to a larger motion. Can be grasped quantitatively.

  In addition, depending on the design, a part of the screen may move greatly even when the screen is almost a still image. In such a case, instead of the average level of the entire picture, the macroblock (MB) unit is used. It is more suitable to extract the maximum value of the motion vector data and use it as a motion vector amount.

  Therefore, the motion vector amount per one GOP is counted by the motion vector amount detection circuit 90, and the number of dropped frames per GOP is determined by the dropped frame amount determining means 91 depending on whether the counted value exceeds or does not exceed a predetermined value. It is possible to do. In this case, among the compressed video data temporarily stored in the memory by the disk format encoder 42, the data of the B picture is deleted, and the header information allocated in the unit of one GOP or the header information allocated in the unit of one picture is used. The operation is performed to rewrite the header information.

  This is because if an I-picture or P-picture is deleted, the preceding and following B-pictures cannot be decoded, and the information of the deleted picture is written in the header to freeze the previous and next screens during playback, and the The number of frames can be adjusted to the required number of TV systems.

  In the second embodiment, when the moving vector amount is large, the number of dropped frames is reduced. For example, when the moving vector amount is small and the moving vector amount is small, the number of dropped frames is increased, thereby reducing the data amount to be recorded on the optical disc. It becomes possible. In such a method, since the amount of dropped frames is varied according to the movement of the screen, even if the frames are dropped, they are invisible to the human eye. In this case, the detection of the motion vector amount is desirably performed from P pictures evenly allocated in one GOP, and can be performed from B pictures. However, the continuity of the compressed image and the existence of bidirectional data complicate the system. There is a risk of doing so.

  13A, the number of dropped frames is set to zero according to the magnitude of the motion vector amount, and to 6 frames per second (24 pictures / second) as shown in FIG. Although two types can be set, as shown in FIG. 13B, it is also possible to set the number of frames between zero and six frames per second in multiple stages. In the case of a film movie or the like, the frame rate is 24 frames / sec. Therefore, a reproduction method from 24 frames / sec is specified in standards such as MPEG. For this reason, if the number of dropped frames is defined in two steps, that is, 24 frames / second and 30 frames / second, the configuration of the system is simplified, which is extremely practical.

  In FIG. 13, the number of dropped frames is determined stepwise in inverse proportion to the movement between pictures. However, in consideration of the characteristics of the actual human eye, the movement is too fast to exceed the range that the human eye can follow. If the number of dropped frames is increased, the number of dropped frames may be inconspicuous. This is because it is expected that the human eye has a detection limit characteristic of dropped frames as shown in FIG. In this case, it is natural that the dropping of the frame is hardly detected in the image close to the still image. On the other hand, even when the motion of the video is so intense that it is difficult for the human eye to follow, it is naturally difficult to detect a dropped frame. In the data conversion table 92 shown in FIG. 14, the extracted value of the motion vector amount is corrected using such characteristics.

  FIG. 14 is a block circuit diagram for varying the number of frames in consideration of the characteristics of human beings. The same reference numerals as in FIG. 12 denote the same parts, 92 denotes a data conversion table, and 93 denotes a frame drop amount determining means. is there. In the conversion table 92 shown in the figure, when the motion vector amount is equal to or less than a predetermined absolute amount, the number of dropped frames is inversely proportional to the motion vector amount. This is to make the frame drop.

  FIG. 15 is a diagram showing an arrangement of digital compressed video data recorded on the optical disc before frame dropping and according to the second embodiment, and FIG. 16 is a diagram showing video information data recorded on the optical disc with a reduced number of frames. FIG. 16A is a diagram showing how the display on the screen is sometimes displayed. FIG. 16A shows a display screen of video data in which frames are not dropped, and FIG. 16B shows one frame dropped for three screens. 16 (c) is a display screen of video data in which two frames are dropped on three screens, and FIG. 16 (d) is a display screen of video data in which one frame is dropped on five screens Are respectively shown.

  FIG. 17 is a diagram illustrating human visual perception characteristics, and shows how many dropped frames are detected with respect to the speed of image movement.

  The video information actually recorded on the optical disk has a shape as shown in FIG. The original digital compressed video data has a data array as shown in FIG. This means that an I picture can be independently reproduced, but a P picture requires a prediction screen from the previous I picture or P picture, and a B picture requires a prediction picture from the preceding or succeeding I picture or P picture. This is because a prediction screen is required. Therefore, unlike the reproduction order of the screen, the data of the P picture is arranged after the I picture, and the data of the B picture is arranged after the I picture.

  However, regarding the data arrangement on the optical disc, for example, when only the I picture and the P picture are reproduced during the special reproduction, it is very convenient that the I picture and the P picture are continuously arranged. 15 (c). This is because the data amount after compression is sufficiently smaller than the original video signal data amount, so that the memory of the optical disk reproducing device can be easily rearranged, and the data array conversion described above is sufficient. It is because it is possible to respond to. In the case of this method, the data amount is further reduced and the file efficiency is reduced as shown in FIG. Has improved.

  Such data rearrangement and picture data reduction are performed by, for example, the disk format encoder 42 shown in FIG. 12 or FIG. 14, but for the purpose of removing intersymbol interference when performing high-density recording. For example, modulation such as EFM modulation or 1-7 modulation is performed, and is temporarily recorded on a recordable file device (for example, a magnetic disk, a magnetic tape, or a magneto-optical disk). For example, a master is created by the ROM disk mastering device 45 using the data once stored in this way, and the ROM disk 9 is mass-produced by the stamper. As a matter of course, when the optical disk is a recording / reproducing device, the above operation is performed without passing through the recording data file 7 and the ROM disk mastering device, and data is recorded directly on the optical disk.

  Next, when the above-described compressed video data is read from the optical disc, reproduced, and displayed on the screen, the result is as shown in FIG. FIG. 16A shows a video in which frame skipping is not allowed and there is some movement between pictures. The video corresponds to a video before encoding in picture units. On the other hand, when the skipping of one frame is allowed for three screens, the result is as shown in FIG. 16B, in which the B2, B4, and B6 pictures are dropped, and the B1, B3, and B5 pictures are frozen ( Display again). Further, when two frames are dropped on three screens, a screen without a B picture is reproduced. In the case shown in FIG. 16 (c), the state of dropped frames is easily detected by human eyes. However, when the image is very close to a still image, even if dropped frames are allowed to this point, it is not noticeable.

  Also, as shown in FIG. 16 (d), it is conceivable to allow one frame to be dropped every five screens which is halfway between FIG. 16 (a) and FIG. 16 (b). This can be dealt with by dropping frames and freezing the previous and next pictures. In this case, it is desirable to fix the position of the freeze on the five screens in the case of FIG. In order to perform frame dropping of only the B picture, as shown in FIG. 16D, not only the preceding image is always frozen, but also the subsequent image is frozen. Such freeze control is performed by providing a flag or the like in a header provided at the head of the GOP or a header provided at the head of picture data.

  Here, the important control information for redundantly displaying the dropped video data is to determine whether the video data is of the interlace or non-interlace type. As shown in FIG. 19, information for this purpose is desirably described in user data 52 in a sequence header 46 described at the beginning of one or a plurality of video information units GOP47 in which a plurality of video data are grouped. . This is because the switching of the interlacing method on a picture basis is not so common due to motion compensation or the like, and is not changed so much once set.

  It is preferable that the control command for determining which field is to be overlapped be displayed is controlled in units of a screen in order to eliminate awkward movement or the like, and the user command is provided in the user data area 52 provided at the top of the picture layer 56 in FIG. It is good to write it.

  As a method of pulling up video data originally having a small number of frames to a predetermined frame rate at the time of display, a movie material of a film source is often used. In this case, when the original film is converted into a television signal as shown in FIG. 22A, images created from the same film are generated in three or two fields. Therefore, as shown in the figure, one out of every five fields is displayed and reproduced on the television. However, in the insertion, the first field and the second field are inserted alternately every several sheets. By doing so, it is possible to convert the frame rate while maintaining the smoothness even when the video is displayed repeatedly. When frames are dropped from what was originally a television signal, there is a chronological order in field units, so that overlapping display is performed based on information of the immediately preceding field.

9 is a flowchart illustrating a decoding method when control information according to Embodiment 1 of the present invention is inserted into user data of a video stream. FIG. 2 is a block circuit diagram showing a configuration of the optical disc reproducing device according to the first embodiment. 5 is a flowchart at the time of normal reproduction according to the first embodiment. 5 is a flowchart at the time of low-speed reproduction in the first embodiment. FIG. 3 is a diagram showing a system stream for normal reproduction according to the first embodiment. FIG. 3 is a diagram showing a system stream for low-speed reproduction according to the first embodiment. FIG. 3 is a diagram showing a storage arrangement of stream information on an optical disc according to the first embodiment. FIG. 3 is a conceptual diagram showing a video stream for normal reproduction and a stream for interpolation information according to the first embodiment. FIG. 4 is a diagram illustrating a field reproduction method during normal reproduction according to the first embodiment. FIG. 8 is a diagram illustrating a video recording / reproducing method according to Embodiment 2 of the present invention. FIG. 11 is a diagram showing a structure of a video stream for realizing a screen freeze according to the second embodiment. FIG. 9 is a block circuit diagram according to a second embodiment. FIG. 14 is a diagram showing how frames are dropped with respect to a motion vector amount in the second embodiment. FIG. 13 is a block circuit diagram of Embodiment 2 that varies the number of frames in consideration of human characteristics. FIG. 10 is a diagram showing an arrangement of digital compressed video data recorded before a frame drop and in an optical disc according to a second embodiment. FIG. 14 is a diagram showing how video information data recorded on an optical disc with a reduced number of frames is displayed on a screen during reproduction in the second embodiment. FIG. 14 is a diagram illustrating human visual perception characteristics according to the second embodiment. FIG. 14 is a diagram illustrating a reproduction mode according to a flag setting according to the second embodiment. FIG. 14 is a diagram showing a structure of a video stream for realizing a screen freeze according to the second embodiment. FIG. 14 is a diagram showing a structure of a video stream for realizing a screen freeze according to the second embodiment. FIG. 14 is a diagram showing a structure of a video stream for realizing a screen freeze according to the second embodiment. FIG. 13 is a diagram illustrating a method of deleting a field of a video material according to the second embodiment. FIG. 9 is a diagram showing a simplified data array structure (layer structure) of the conventional MPEG system. FIG. 10 is a diagram illustrating an encoding structure when 15 screens in the related art are formed as 1 GOP. FIG. 11 is a diagram comparing a conventional video data amount in one GOP with a variable structure in order to keep the image quality between GOPs constant and a fixed rate in order to keep the recording time constant. FIG. 9 is a diagram illustrating a data amount per GOP when the image quality per GOP is kept the same in the related art. FIG. 10 is a block circuit diagram of a conventional optical disc device.

Explanation of reference numerals

  REFERENCE SIGNS LIST 1 optical disk, 2 reproduction amplifier, 3 demodulator, 4 error correction means, 5 temporal reference conversion control means, 6 buffer, 7 decoding means, 8 D / A converter, 9 reproduction control means, 10 optical head control means, 11 Interpolation information reading control means, 12 pack header, 13 system header, 14 private 2 packets, 15 audio packets, 16 private packets, 17 video packets, 18 information flags, 19 information addresses, 20 information sizes, 21 picture rates, 22 packet lengths , 23 packet start code, 24 return address value, 25 picture address data, 26 TOC, 27 video information for normal reproduction, 28 video information for low speed reproduction, 29 picture header, 30 pictures Encoding function extension unit, 31 Quantization matrix function extension unit, 32 picture display function extension unit, 33 picture space scalable function extension unit, 34 picture temporal scalable function extension unit, 35 slice layer, 37 top field first flag, 38 repeat first Field flag, 39 progressive frame flag, 40 video A / D converter, 41 video information compression means, 42 disk format encoder, 43 modulation means, 44 data storage, 45 ROM disk mastering device, 46 sequence header, 47 GOP, 48 sequence Header code, 49 sequence extension, 50 sequence display extension, 51 sequence scalable extension, 52 user data 53 user data start part, 54 user data, 55 GOP header, 56 picture layer, 57 picture header, 58 slice layer, 59 GOP, 60 GOP layer, 61 slice, 62 slice layer, 63 block layer, 66 I picture, 67 B Picture, 68P picture, 69 frame sector means, 70 encoder, 71 modulator, 72 laser drive circuit, 73 laser output switch, 74 optical head, 75 actuator, 76 optical disk, 77 disk motor, 78 traverse motor, 79 motor drive circuit , 80 motor control circuit, 81 motor control circuit, 82 reproduction amplifier, 83 demodulator, 84 decoder, 85 frame sector reverse conversion means, 86 information decompression means , 87 D / A converter, 88 deleted field, 89 field, 90 motion vector amount detecting means, 91 dropped frame determining means, 92 data conversion table, 93 dropped frame determining means.

Claims (7)

The reference picture is an I picture that is video information subjected to intra-frame DCT, a P picture that is video information obtained by DCT coding that has been subjected to forward motion compensation, and the I picture and P picture that are temporally located before and after. In a recording method for recording video information including a B picture, which is video information by DCT coding with motion compensation performed thereon, and digital information including control information of the video information on a recording medium,
The digital information is configured in units of a video packet including the private packet including the control information and the video information,
The private packet is arranged before the video packet,
A recording method for a recording medium, characterized in that information about the number of frames per second in video information of the video packet and a storage address of the picture stored in the packet are recorded in the private packet. The video information includes first video information and second video information related to the first video information, and the first video information and the second video information are determined by an operator's selection. Either is playable,
The method according to claim 1, wherein a start address of the second video information is recorded in the private packet. The reference picture is an I picture that is video information subjected to intra-frame DCT, a P picture that is video information obtained by DCT coding that has been subjected to forward motion compensation, and the I picture and P picture that are temporally located before and after. In a recording method for recording video information including a B picture, which is video information by DCT coding with motion compensation performed thereon, and digital information including control information of the video information on a recording medium,
The digital information is configured in units of a video packet including the private packet including the control information and the video information,
The private packet is arranged before the video packet,
The video information includes first video information and second video information related to the first video information,
In the digital private packet including the first video information, information on the number of frames per second in the video information of the video packet is recorded.
A recording method for a recording medium, characterized in that a storage address of the picture stored in the digital private packet including the second video information is recorded. Either the first video information or the second video information can be reproduced by an operator's selection,
4. The method according to claim 3, wherein a start address of the second video information is recorded in the private packet. A reproducing method for reproducing a recording medium recorded by the recording medium recording method according to claim 1,
The private packet, obtaining information on the number of frames per second in the video information of the video packet, and the storage address of the picture,
A method for reproducing a recording medium, comprising: reproducing the video information based on information on the number of frames per second in the video information of the video packet and a storage address of the picture. A reproducing method for reproducing a recording medium recorded by the recording medium recording method according to claim 2 or 4,
The private packet, information on the number of frames per second in the video information of the video packet, and the start address of the second video information,
Based on the information on the number of frames per second in the video information of the video packet, reproduce the video information,
A method for reproducing a recording medium, comprising: reproducing the second video information based on a start address of the second video information when the second video information is selected.   When it is determined from the information on the number of frames per second in the video information of the video packet of the private packet that the information is information from a movie film of 24 frames per second, a field of one out of four is overlapped and displayed. 7. The method according to claim 5, wherein the first field and the second field are alternately inserted every few sheets to exchange a frame rate for reproduction.

Images