JP2006197129A - Reproducing device and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve inconvenience, when continuously reproducing video data encoded with various encoding systems from a recording medium in which the video data are mixed. <P>SOLUTION: The video reproducing device has a reproducing means 102, which reproduces first video data encoded by a first encoding system and second video data encoded by a second encoding system from the recording medium, a decoding means 106 for decoding the second video data, an encoding means 107 for encoding the video data decoded by the decoding means 106, an output means 109 for outputting the first video data and the second video data encoded by the encoding means 107 to the outside, and a delay means 105 for delaying the first video data reproduced by the reproducing means 102 for a prescribed period of time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reproducing apparatus for reproducing encoded video data recorded on a recording medium such as a magnetic tape.

  In the conventional video recording method, SD (Standard Definition) video data encoded according to the DV standard proposed by the HD Digital VCR Conference is recorded on a magnetic tape compliant with the DV standard. is there.

Recently, a video recording method has been proposed in which HD (High Definition) video data encoded according to an encoding method compliant with the MPEG-2 (Moving Picture Expert Group 2) standard is recorded on a magnetic tape compliant with the DV standard. (For example, refer to Patent Document 1). According to this video recording method, not only SD video data but also HD video data can be recorded on one magnetic tape.
JP 2001-291335 A

  Consider a case where SD video data and HD video data are reproduced from the magnetic tape and output to an external device from a digital interface unit conforming to IEEE Std 1394-1995 or the like. In this case, if the external device is a device that only complies with the DV standard, the external device cannot handle HD video data, and therefore HD video data can be decoded or recorded even if HD video data is output. Can not. Since current digital video cameras are generally devices that conform only to the DV standard, such problems can occur sufficiently.

  As one method for solving such a problem, it is conceivable to convert HD video data into SD video data and output it.

  However, in the method of converting HD video data to SD video data and outputting the video data, as shown in FIG. 10, the video data cannot be output at the portion where the SD video data and the HD video data are switched, or the video data There is a problem that a part of the data cannot be output.

  For example, when HD video data is played after SD video data, the HD video data must be decoded and output after the decoded HD video data is converted into SD video data. Since the output of the generated SD video data is delayed, there arises a problem that the video data cannot be output for a certain period of time (portion 1001 in FIG. 10). In particular, when the HD video data conforms to the MPEG-2 standard, the video data corresponding to the I, B, and P pictures must be rearranged, and it takes time to decode and the output of the video data. The period that cannot be increased. If the period during which video data cannot be output becomes long, there is a risk that the user or an external device will be mistaken for the end of playback when playback of the SD video data ends.

  In addition, when SD video data is reproduced after HD video data, the output of the next SD video data starts before the output of the SD video data generated from the HD video data is completed. The last part of the video data or the first part of the SD video data cannot be output. In particular, when the HD video data conforms to the MPEG-2 standard, the video data corresponding to the I, B, and P pictures must be rearranged. growing. If the part that cannot be output becomes large, it may be impossible to see or record the important part.

  Such a problem is a problem that can occur when video data encoded by various encoding methods is continuously reproduced from a recording medium (in particular, a magnetic tape) in which video data is mixed.

  The present invention has been made in view of such a problem, and improves the inconvenience in the case of continuously reproducing from a recording medium in which video data encoded by various encoding methods is mixed. For the purpose. For example, an object is to reduce a period during which video data cannot be output and to reduce a portion where video data cannot be output.

  One of the reproducing apparatuses according to the present invention is configured to record, from a recording medium, first video data encoded by the first encoding method and second video data encoded by the second encoding method. Reproducing means for reproducing, decoding means for decoding the second video data, encoding means for encoding the video data decoded by the decoding means by the first encoding method, and the first video Output means for outputting the data and the second video data encoded by the encoding means to the outside, and at least the period required for the decoding process by the decoding means and the encoding process by the encoding means Delay means for delaying the first video data reproduced by the means and supplying the first video data to the output means.

  One of the reproducing apparatuses according to the present invention is configured to record, from a recording medium, first video data encoded by the first encoding method and second video data encoded by the second encoding method. Reproducing means for reproducing, decoding means for decoding the second video data, encoding means for encoding the video data decoded by the decoding means by the first encoding method, and the first video Output means for outputting data and the second video data encoded by the encoding means to the outside, and delaying the first video data reproduced by the reproducing means for a first predetermined period, First delay means for supplying to the output means, and supplying the second video data encoded by the encoding means to the output means with a delay of a second predetermined period shorter than the first predetermined period. Second delay means for Characterized in that it.

  One of the reproducing apparatuses according to the present invention is configured to record, from a recording medium, first video data encoded by the first encoding method and second video data encoded by the second encoding method. Reproducing means for reproducing, decoding means for decoding the second video data, encoding means for encoding the video data decoded by the decoding means by the first encoding method, and the first video Output means for outputting the data and the second video data encoded by the encoding means to the outside, and from when the first video data is reproduced by the reproducing means until it is output from the output means And the period from when the second video data is reproduced by the reproducing unit, decoded by the decoding unit, encoded by the encoding unit, and output from the output unit Yo In, and having a delay means for supplying to said output means delays the reproduced first image data was by the reproducing means.

  One of the reproduction methods according to the present invention is to record first video data encoded by the first encoding method and second video data encoded by the second encoding method from a recording medium. A reproduction step of reproducing; a decoding step of decoding the second video data; an encoding step of encoding the video data decoded in the decoding step by the first encoding method; and the first video An output step of outputting data and the second video data encoded in the encoding step to an external device via an output means, and at least a decoding process in the decoding step and an encoding process in the encoding step A delay step of delaying the first video data reproduced in the reproduction step and supplying the first video data to the output means for a required period.

  One of the reproduction methods according to the present invention is to record first video data encoded by the first encoding method and second video data encoded by the second encoding method from a recording medium. A reproduction step of reproducing; a decoding step of decoding the second video data; an encoding step of encoding the video data decoded in the decoding step by the first encoding method; and the first video An output step of outputting data and the second video data encoded in the encoding step to an external device via an output means; and the first video data reproduced in the reproduction step is a first A first delay step of delaying a predetermined period and supplying the output means to the output means; and delaying the second video data encoded in the encoding step for a second predetermined period shorter than the first predetermined period. Supply to the output means And having a second delay step.

  One of the reproduction methods according to the present invention is to record first video data encoded by the first encoding method and second video data encoded by the second encoding method from a recording medium. A reproduction step of reproducing; a decoding step of decoding the second video data; an encoding step of encoding the video data decoded in the decoding step by the first encoding method; and the first video An output step of outputting data and the second video data encoded in the encoding step to an external device via an output means; and the output after the first video data is reproduced in the reproduction step Is reproduced in the reproduction step so that the period until the second video data is reproduced, decoded, encoded and output from the output means is substantially the same. Before Delaying the first image data and having a delay step of supplying to said output means.

  One of the playback apparatuses according to the present invention is a first video data encoded by a first encoding method and a video encoded by a plurality of encoding methods different from the first encoding method. Reproduction means for reproducing data from a recording medium, conversion means for converting video data encoded by an encoding method different from the first encoding method into video data of the first encoding method, An output means for outputting the first video data and the video data of the first encoding method generated by the conversion means; and the output means after the reproduction of the first video data by the reproduction means. And the period from when the video data of the encoding method different from the first encoding method is reproduced to when it is converted by the conversion means and output from the output means are substantially the same. Make Sea urchin, and having a delay means for delaying the video data reproduced by said reproducing means.

  One of the playback apparatuses according to the present invention is a first video data encoded by a first encoding method and a video encoded by a plurality of encoding methods different from the first encoding method. Reproducing means for reproducing data from a recording medium, decoding means for decoding video data encoded by an encoding method different from the first encoding method, and video data decoded by the decoding means for the first data Encoding means for encoding video data of one encoding system, and output means for outputting the first video data and video data of the first encoding system encoded by the encoding means to the outside And a period from when the first video data is reproduced by the reproducing means until it is output from the output means, and after video data of an encoding method different from the first encoding method is reproduced. The encoding Time to be outputted from said output means are coded by a step so as to substantially coincide, and delay means for delaying the video data reproduced by said reproducing means, characterized in that it has.

  One of the reproduction methods according to the present invention is the first video data encoded by the first encoding method and the video encoded by a plurality of encoding methods different from the first encoding method. A reproduction step of reproducing data from a recording medium, a conversion step of converting video data encoded by an encoding method different from the first encoding method into video data of the first encoding method, An output step of outputting the first video data and the video data of the first encoding method generated in the conversion step to an external device via an output means; and the first video data is reproduced in the reproduction step A period from when the video data is output to the output means, and after the video data of an encoding system different from the first encoding system is reproduced, the video data is converted in the conversion step and output from the output means So as to substantially coincide with periods in, and having a delay step for delaying the reproduced video data in the regeneration step.

  One of the reproduction methods according to the present invention is the first video data encoded by the first encoding method and the video encoded by a plurality of encoding methods different from the first encoding method. A reproduction step of reproducing data from a recording medium, a decoding step of decoding video data encoded by an encoding method different from the first encoding method, and the video data decoded in the decoding step An encoding step for encoding video data of one encoding method, and an output means for outputting the first video data and the video data of the first encoding method encoded in the encoding step to an external device. An output process through which the first video data is reproduced and output from the output means in the reproduction process, and an image having an encoding method different from the first encoding method The data is A delay step for delaying the video data reproduced in the reproduction step so as to substantially match a period from the generation to the encoding in the encoding step and output from the output means. Features.

  According to the present invention, it is possible to improve omission in the switching portion of the encoding method of the reproduced video data.

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

  In the following embodiments, an encoding method defined in the SD standard of the DV standard is referred to as “DV-SD format”, and SD video data encoded according to the DV-SD format is referred to as “DV-SD data”. . For example, the 480i system is adopted for the SD video data. The 480i method is a video method that employs 480 effective scanning lines and interlaced scanning. Also, an encoding method defined in the SDL mode of the DV standard is referred to as “DV-SDL format”, and SD video data encoded according to the DV-SDL format is referred to as “DV-SDL data”. The DV-SDL format is an encoding method in which the compression bit rate is increased and the recording bit rate is decreased as compared with the DV-SD format. An encoding method (MP @ HL, MP @ H-14, etc.) compliant with the MPEG-2 standard is called “MPEG2 format”, and HD video data encoded according to the MPEG2 format is called “MPEG2 data”. For the HD video data, for example, the 1080i system is adopted. The 1080i system is a video system that employs 1080 effective scanning lines and interlaced scanning.

[First Embodiment]
FIG. 1 is a block diagram showing the configuration of a video playback apparatus (digital video recorder, digital video camera, etc.) according to the first embodiment of the present invention. The video reproduction apparatus according to the first embodiment reproduces them from a recording medium on which DV-SD data and MPEG2 data are recorded, and when MPEG2 data is reproduced, converts it into DV-SD data. It is a device that outputs to the outside.

  In FIG. 1, a recording medium 101 is a magnetic tape compliant with the DV standard, and records DV-SD data and MPEG2 data. DV-SD data and MPEG2 data may be recorded in any order. The recording medium 101 may be a recording medium other than a magnetic tape.

  The playback unit 102 plays back the encoded video data from the recording medium 101 in accordance with an instruction from the user.

  The format detection unit 103 detects the format information reproduced together with the encoded video data, and notifies the control unit 111 of the detected format information. The format information is information indicating an encoding method of encoded video data, and is recorded in an ITI (insert and track information) sector, a subcode sector, or the like. Based on the format information from the format detection unit 103, the control unit 111 determines whether the encoding method of the encoded video data is the DV-SD format or the MPEG2 format.

  The switch 104 selects the buffer memory 105 or the MPEG2 decoder 106 in accordance with an instruction from the control unit 111. When determining that the encoding method of the encoded video data reproduced from the recording medium 101 is the DV-SD format, the control unit 111 causes the switch 104 to select the buffer memory 105. When determining that the encoding method of the encoded video data reproduced from the recording medium 101 is the MPEG2 format, the control unit 111 causes the switch 104 to select the MPEG2 decoder 106.

  The buffer memory 105 is a memory having a sufficient capacity to give a delay of a predetermined period T1 to DV-SD data reproduced from the recording medium 101. In the present embodiment, the buffer memory 105 is configured by a random access memory, but other configurations may be employed. The controller 111 controls reading and writing of the buffer memory 105.

  During the predetermined period T1, the DV-SD data from the buffer memory 105 and the DV-SD data from the DV-SD encoder 107 do not spread for a certain period or more, and these DV-SD data do not overlap. It is a period for doing so. The predetermined period T1 may be longer than (1) a period required for converting MPEG2 data of a predetermined unit (for example, 1 GOP) into DV-SD data, and (2) the first part of the MPEG2 data is reproduced. , A period from when converted into DV-SD data and output from the output terminal 110 to a period when the first part of the DV-SD data is reproduced and output from the output terminal 110 substantially coincides with each other. Also good. Further, the predetermined period T1 may be changed according to the data rate of the MPEG2 data.

  The MPEG2 decoder 106 decodes the MPEG2 data from the playback unit 102 and supplies the decoded MPEG2 data to the DV-SD encoder 107. At this time, as shown in FIG. 5, the MPEG2 decoder 106 rearranges the video data related to the I, P, and B pictures in the correct order and supplies them to the DV-SD encoder 107.

  The DV-SD encoder 107 encodes the video data from the MPEG2 decoder 106 according to the DV-SD format. That is, the DV-SD encoder 107 converts the decoded MPEG2 data into DV-SD data.

  The switch 108 selects the buffer memory 105 or the DV-SD encoder 107 in accordance with an instruction from the control unit 111. The timing at which the switch 108 selects the buffer memory 105 or the DV-SD encoder 107 is controlled by the control unit 111. The control unit 111 controls the switch 108 so that the DV-SD data from the buffer memory 105 and the DV-SD data from the DV-SD encoder 107 are as continuous as possible. Accordingly, even when DV-SD data and MPEG2 data are continuously reproduced, DV-SD data and DV-SD data generated from MPEG2 data are continuously output from the output terminal 110 to the external device. It becomes possible to output.

  The digital interface unit 109 outputs DV-SD data from the buffer memory 105 or the DV-SD encoder 107 to the external device from the output terminal 110. At this time, the digital interface unit 109 outputs DV-SD data to the outside according to a predetermined transfer method (for example, isochronous transfer defined by USB (Universal Serial Bus), IEEE Std 1394-1995, etc.). . Also, when there is a gap between the DV-SD data from the buffer memory 105 and the DV-SD data from the DV-SD encoder 107, the digital interface unit 109 outputs a null packet from the output terminal 110 to the external device. . In the present embodiment, an isochronous packet having only a DV standard CIP (Common Isochronous Header) header is a null packet. Since the CIP header is described in IEC 61883-1 and IEC 61883-2, description thereof is omitted.

  The control unit 111 controls the operation of the video reproduction apparatus shown in FIG. 1 according to a computer program stored in a memory in the control unit 111.

  FIG. 2 is a diagram for explaining a procedure in the case of reproducing MPEG2 data from the recording medium 101 following DV-SD data.

  DV-SD data reproduced from the recording medium 101 is supplied from the reproducing unit 102 to the buffer memory 105. The DV-SD data is supplied to the digital interface unit 109 after being delayed by the buffer memory 105 for a predetermined period T1.

  MPEG2 data reproduced from the recording medium 101 after the DV-SD data is supplied from the reproducing unit 102 to the MPEG2 decoder 106. The MPEG2 data is decoded by the MPEG2 decoder 106, converted into DV-SD data by the DV-SD encoder 107, and then supplied to the digital interface unit 109. At this time, as shown in FIG. 2, the MPEG2 decoder 106 rearranges the video data related to the I, P, and B pictures in the correct order and supplies them to the DV-SD encoder 107.

  The control unit 111 controls the switch 108 so that the DV-SD data from the buffer memory 105 and the DV-SD data from the DV-SD encoder 107 are as continuous as possible. The digital interface unit 109 outputs the DV-SD data from the buffer memory 105 from the output terminal 110, and then outputs the DV-SD data from the DV-SD encoder 107 from the output terminal 110. As a result, the reproduced DV-SD data and the DV-SD data generated from the reproduced MPEG2 data are output from the output terminal 110 almost without interruption as shown in FIG.

  As described above, according to the video reproduction apparatus according to the present embodiment, the DV-SD data reproduced from the recording medium 101 can be delayed by the buffer memory 105, so that the MPEG2 data is reproduced following the DV-SD data. Even in this case, the reproduced DV-SD data and the DV-SD data generated from the reproduced MPEG2 data can be continuously output from the output terminal 110 to the external device. As a result, the period during which the video data cannot be output can be reduced, and the problem of misunderstanding the user or the external device can be solved.

  FIG. 3 is a diagram for explaining a procedure in the case of reproducing DV-SD data from the recording medium 101 following MPEG2 data.

  MPEG2 data reproduced from the recording medium 101 is supplied from the reproduction unit 102 to the MPEG2 decoder 106. The MPEG2 data is decoded by the MPEG2 decoder 106, converted into DV-SD data by the DV-SD encoder 107, and then supplied to the digital interface unit 109. At this time, as shown in FIG. 3, the MPEG2 decoder 106 rearranges the video data related to the I, P, and B pictures in the correct order and supplies them to the DV-SD encoder 107.

  DV-SD data reproduced from the recording medium 101 after the MPEG2 data is supplied from the reproducing unit 102 to the buffer memory 105. The DV-SD data is supplied to the digital interface unit 109 after being delayed by the buffer memory 105 for a predetermined period T1.

  The control unit 111 controls the switch 108 so that the DV-SD data from the buffer memory 105 and the DV-SD data from the DV-SD encoder 107 are as continuous as possible. The digital interface unit 109 outputs the DV-SD data from the DV-SD encoder 107 from the output terminal 110, and then outputs the DV-SD data from the buffer memory 105 from the output terminal 110. As a result, the reproduced DV-SD data and the DV-SD data generated from the reproduced MPEG2 data are output from the output terminal 110 without overlapping as shown in FIG.

  As described above, according to the video reproduction apparatus according to the present embodiment, DV-SD data reproduced from the recording medium 101 can be delayed by the buffer memory 105, so that the DV-SD data is reproduced after the MPEG2 data. Even in this case, DV-SD data generated from MPEG2 data and DV-SD data reproduced after MPEG2 data can be continuously output from the output terminal 110. As a result, it is possible to reduce the portion where the video data cannot be output, and to solve the problem that the important portion cannot be seen or recorded.

  Note that the video reproduction apparatus according to the present embodiment can be configured by replacing the buffer memory 105 with a delay element such as a delay line.

[Second Embodiment]
FIG. 4 is a block diagram showing the configuration of a video playback apparatus (digital video recorder, digital video camera, etc.) according to the second embodiment of the present invention, and shows parts having functions similar to those of the configuration of FIG. Use the same symbols and their explanation is omitted.

  This embodiment is different from the first embodiment in that a buffer memory 401 is provided in front of the MPEG2 decoder 106. The buffer memory 401 can temporarily hold MPEG2 data from the playback unit 102. In the present embodiment, the buffer memory 401 is configured by a random access memory, but a configuration other than this may be employed. The controller 111 also controls reading and writing of the buffer memory 401. In this embodiment, since the buffer memory 401 is provided before the MPEG2 decoder 106, the size of the buffer memory 105 according to this embodiment is larger than the size of the buffer memory 105 according to the first embodiment. There is a need to.

  Note that the video reproduction apparatus according to the present embodiment can be configured by replacing the buffer memory 105 and / or 401 with a delay element such as a delay line. In the video playback apparatus according to the present embodiment, the buffer memory 401 and the buffer memory 105 are configured as different memories, but can be configured as a single memory.

  FIG. 6 is a flowchart for explaining the flow of playback processing executed by the video playback devices according to the first and second embodiments. This reproduction process is assumed to be controlled according to a computer program stored in a memory in the control unit 111.

  Step S6-1: The playback unit 102 plays back the encoded video data from the recording medium 101 in accordance with an instruction from the user.

  Step S6-2: Based on the format information from the format detection unit 103, the control unit 111 determines whether the encoding method of the encoded video data is the DV-SD format or the MPEG2 format. If it is determined that the encoding method is the DV-SD format, the process proceeds to step S6-3. If it is determined that the encoding method is the MPEG2 format, the process proceeds to step S6-4.

  Step S6-3: The buffer memory 105 gives a delay of a predetermined period T1 to the DV-SD data reproduced from the recording medium 101.

  Step S6-4: The MPEG2 decoder 106 decodes the MPEG2 data from the playback unit 102 and supplies the decoded MPEG2 data to the DV-SD encoder 107.

  Step S6-5: The DV-SD encoder 107 encodes the video data from the MPEG2 decoder 106 according to the DV-SD format. That is, the DV-SD encoder 107 converts the decoded MPEG2 data into DV-SD data.

  Step S6-6: The digital interface unit 109 outputs the DV-SD data from the buffer memory 105 or the DV-SD encoder 107 to the external device from the output terminal 110. However, if there is a gap between the DV-SD data from the buffer memory 105 and the DV-SD data from the DV-SD encoder 107, the null packet is output from the output terminal 110 to the external device.

[Third Embodiment]
FIG. 7 is a block diagram showing the configuration of a video playback apparatus (digital video recorder, digital video camera, etc.) according to the third embodiment of the present invention. Unlike the video playback apparatus according to the first embodiment, the video playback apparatus according to the present embodiment plays back them from a recording medium on which DV-SD data, DV-SDL data, and MPEG2 data are recorded. When SDL data and MPEG2 data are reproduced, the device converts them into DV-SD data and outputs them to the outside.

  In FIG. 7, a recording medium 701 is a magnetic tape defined by the DV standard, and records DV-SD data, DV-SDL data, and MPEG2 data. DV-SD data, DV-SDL data, and MPEG2 data may be recorded in any order. The recording medium 701 may be a recording medium other than a magnetic tape.

  The playback unit 702 plays back the encoded video data from the recording medium 701 in accordance with an instruction from the user.

  The format detection unit 703 detects the format information reproduced together with the encoded video data, and notifies the control unit 713 of the detected format information. The format information is information indicating an encoding method of encoded video data, and is recorded in an ITI (insert and track information) sector, a subcode sector, or the like. The control unit 713 determines whether the encoding method of the encoded video data is the DV-SD format, the DV-SDL format, or the MPEG2 format based on the format information from the format detection unit 703.

  The switch 704 selects the buffer memory 705, the buffer memory 706, or the MPEG2 decoder 708 in accordance with an instruction from the control unit 713. When it is determined that the encoding method of the encoded video data reproduced from the recording medium 701 is the DV-SD format, the control unit 713 causes the switch 704 to select the buffer memory 705. When it is determined that the encoding method of the encoded video data reproduced from the recording medium 701 is the DV-SDL format, the control unit 713 causes the switch 704 to select the buffer memory 706. In addition, when it is determined that the encoding method of the encoded video data reproduced from the recording medium 701 is the MPEG2 format, the control unit 713 causes the switch 704 to select the MPEG2 decoder 708.

  The buffer memory 705 is a memory having a capacity sufficient to give a delay of a predetermined period T1 to DV-SD data reproduced from the recording medium 701. In the present embodiment, the buffer memory 705 is configured by a random access memory, but other configurations may be employed. The control unit 713 also controls reading and writing of the buffer memory 705.

  During the predetermined period T1, the DV-SD data from the buffer memory 705 and the DV-SD data from the DV-SD encoder 107 do not spread over a certain period, and these DV-SD data do not overlap. It is a period for doing so. The predetermined period T1 may be longer than (1) a period required for converting MPEG2 data of a predetermined unit (for example, 1 GOP) into DV-SD data, and (2) the first part of the MPEG2 data is reproduced. , A period from when converted into DV-SD data and output from the output terminal 110 to a period when the first part of the DV-SD data is reproduced and output from the output terminal 110 substantially coincides with each other. Also good. Further, the predetermined period T1 may be changed according to the data rate of the MPEG2 data.

  The buffer memory 706 is a memory having a capacity sufficient to give a delay of a predetermined period T2 to DV-SDL data reproduced from the recording medium 701. In the present embodiment, the buffer memory 706 is configured by a random access memory, but other configurations may be employed. The control unit 713 also controls reading and writing of the buffer memory 706.

  The predetermined period T2 is a period shorter than the predetermined period T1, and the decoded video data from the DV-SDL decoder 707 and the decoded video data from the MPEG2 decoder 708 are prevented from spreading over a predetermined period. This is a period for preventing DV-SD data from overlapping. The predetermined period T2 may be a period longer than (1) a period required to decode MPEG2 data of a predetermined unit (for example, 1 GOP). (2) The first part of the MPEG2 data is reproduced and DV-SD data Is substantially the same as the period until the first part of the DV-SDL data is reproduced and converted to DV-SD data and output from the output terminal 110. It is good also as a period to do. Further, the predetermined period T1 may be changed according to the data rate of the MPEG2 data.

  The DV-SDL decoder 707 decodes the DV-SDL data from the playback unit 702 and supplies the decoded DV-SDL data to the DV-SD encoder 709.

  The MPEG2 decoder 708 decodes the MPEG2 data from the playback unit 702 and supplies the decoded MPEG2 data to the DV-SD encoder 709. At this time, the MPEG2 decoder 708 rearranges the video data related to the I, P and B pictures in the correct order as shown in FIG. 5 and supplies them to the DV-SD encoder 709.

  The DV-SD encoder 709 encodes the video data from the DV-SDL decoder 707 or the MPEG2 decoder 708 according to the DV-SD format. That is, the DV-SD encoder 709 converts the decoded DV-SDL data and the decoded MPEG2 data into DV-SD data.

  The switch 710 selects the buffer memory 705 or the DV-SD encoder 709 in accordance with an instruction from the control unit 713. The timing at which the switch 710 selects the buffer memory 705 or the DV-SD encoder 709 is controlled by the control unit 713. The control unit 713 controls the switch 710 so that the DV-SD data from the buffer memory 705 and the DV-SD data from the DV-SD encoder 107 are as continuous as possible. As a result, DV-SD data and DV-SD data generated from MPEG2 data can be continuously output from the output terminal 712 to an external device, as well as DV-SD data and DV-SDL. The DV-SD data generated from the data can be continuously output from the output terminal 712 to the external device.

  The digital interface unit 711 outputs DV-SD data from the buffer memory 705 or the DV-SD encoder 709 from the output terminal 712 to an external device. At this time, the digital interface unit 711 outputs DV-SD data to the outside according to a predetermined transfer method (for example, isochronous transfer defined by USB, IEEE Std 1394-1995, etc.). Also, when there is a gap between the DV-SD data from the buffer memory 705 and the DV-SD data from the DV-SD encoder 709, the digital interface unit 711 outputs a null packet from the output terminal 712 to the external device. . Similarly to the first embodiment, in this embodiment, an isochronous packet having only a DV standard CIP header is defined as a null packet. The digital interface unit 711 also sends the null packet from the output terminal 712 even when there is a gap between the DV-SD data generated from the MPEG2 data and the DV-SD data generated from the DV-SDL data. Output to an external device.

  The control unit 713 controls the operation of the video reproduction apparatus shown in FIG. 7 according to a computer program stored in the memory in the control unit 713.

  FIG. 8 is a diagram for explaining a procedure in a case where MPEG-2 data is reproduced from DV-SD data, followed by MPEG-2 data and DV-SDL data is reproduced from the recording medium.

  DV-SD data reproduced from the recording medium 701 is supplied from the reproducing unit 702 to the buffer memory 705. The DV-SD data is supplied to the digital interface unit 711 after being delayed by a predetermined period T1 in the buffer memory 705.

  MPEG2 data reproduced from the recording medium 701 after the DV-SD data is supplied from the reproducing unit 702 to the MPEG2 decoder 708. The MPEG2 data is decoded by the MPEG2 decoder 708, converted into DV-SD data by the DV-SD encoder 709, and then supplied to the digital interface unit 711. At this time, the MPEG2 decoder 708 rearranges the video data relating to the I, P, and B pictures in the correct order as shown in FIG. 8 and supplies them to the DV-SD encoder 709.

  DV-SDL data reproduced from the recording medium 701 after the MPEG2 data is supplied from the reproducing unit 702 to the buffer memory 706. The DV-SDL data is delayed by the buffer memory 705 for a predetermined period T2, and then decoded by the DV-SDL decoder 707. The decoded DV-SDL data is converted into DV-SD data by the DV-SD encoder 709 and then supplied to the digital interface unit 711.

  The control unit 713 controls the switch 710 so that the DV-SD data from the buffer memory 705 and the DV-SD data from the DV-SD encoder 709 are as continuous as possible. The digital interface unit 711 outputs DV-SD data from the buffer memory 705 from the output terminal 712 and then outputs DV-SD data from the DV-SD encoder 709 from the output terminal 712. As a result, the reproduced DV-SD data and the reproduced MPEG2 data and the DV-SD data generated from the reproduced DV-SDL data are output without interruption or overlap as shown in FIG. It is output from the terminal 712.

  As described above, according to the video reproduction apparatus according to the present embodiment, DV-SD data reproduced from the recording medium 701 is delayed by the buffer memory 705, and DV-SDL data reproduced from the recording medium 701 is buffered by the buffer memory 706. Therefore, even when DV-SD data, DV-SDL data, and MPEG2 data are continuously reproduced, the reproduced DV-SD data and the reproduced DV-SDL data or MPEG2 data are used. The generated DV-SD data can be continuously output from the output terminal 110. As a result, the period during which the video data cannot be output can be reduced, and the problem of misunderstanding the user or the external device can be solved. Further, it is possible to reduce the portion where the video data cannot be output, and to solve the problem that the important portion cannot be seen or recorded.

  FIG. 9 is a flowchart for explaining the flow of playback processing executed by the video playback apparatus according to the present embodiment. This reproduction process is controlled according to a computer program stored in a memory in the control unit 713.

  Step S9-1: The reproduction unit 702 reproduces the encoded video data from the recording medium 701 in accordance with an instruction from the user.

  Step S9-2: The control unit 713 determines, based on the format information from the format detection unit 703, whether the encoded video data encoding method is DV-SD format, DV-SDL format, or MPEG2 format. If it is determined that the encoding method is the DV-SD format, the process proceeds to step S9-3. If it is determined that it is the DV-SD format, the process proceeds to step S9-4. Proceed to S9-6.

  Step S9-3: The buffer memory 705 gives a delay of a predetermined period T1 to the DV-SD data reproduced from the recording medium 701.

  Step S9-4: The buffer memory 706 gives a delay of a predetermined period T2 to the DV-SDL data reproduced from the recording medium 701.

  Step S9-5: The DV-SDL decoder 707 decodes the DV-SDL data from the reproducing unit 702, and supplies the decoded DV-SDL data to the DV-SD encoder 709.

  Step S9-6: The MPEG2 decoder 708 decodes the MPEG2 data from the reproduction unit 702 and supplies the decoded MPEG2 data to the DV-SD encoder 709.

  Step S9-7: The DV-SD encoder 709 encodes the video data from the MPEG2 decoder 708 according to the DV-SD format. That is, the DV-SD encoder 709 converts the decoded MPEG2 data into DV-SD data.

  Step S9-8: The digital interface unit 711 outputs DV-SD data from the buffer memory 705 or the DV-SD encoder 709 to the external device from the output terminal 712. However, if there is a gap between the DV-SD data from the buffer memory 705 and the DV-SD data from the DV-SD encoder 709, the null packet is output from the output terminal 712 to the external device.

  Note that the video reproduction apparatus according to the present embodiment can be configured by replacing the buffer memories 705 and / or 706 with a delay element such as a delay line.

  In addition, the video reproduction apparatus according to the present embodiment can be configured by arranging the buffer memory 706 after the DV-SDL decoder 707 instead of before the DV-SDL decoder 707.

  The video playback apparatus according to the present embodiment can also be configured to play back a recording medium on which video data encoded in three or more different formats is recorded.

  Also, the video playback apparatus according to the present embodiment may be configured to provide a buffer memory in front of the MPEG2 decoder 708, similarly to the video playback apparatus according to the second embodiment.

[Other Embodiments]
In addition, the object of each of the above-described embodiments is to supply a storage medium (or recording medium) that records a computer program that implements the functions of the above-described embodiments to a system or apparatus, and the computer (or CPU) of the system or apparatus. Needless to say, this can also be achieved by reading and executing a computer program stored in a storage medium. In this case, the computer program itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the computer program constitutes the present invention. Further, by executing the computer program read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) operating on the computer based on the instructions of the computer program. It goes without saying that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.

  Further, after the computer program read from the storage medium is written in a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the function is determined based on the instruction of the computer program. It goes without saying that the CPU or the like provided in the expansion card or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.

  When the present invention is applied to the above storage medium, the storage medium stores a computer program corresponding to the flowchart described above.

It is a block diagram which shows the structure of the video reproduction apparatus which concerns on 1st Embodiment. It is a figure for demonstrating the procedure in the case of reproducing | regenerating MPEG2 data from a recording medium following DV-SD data. It is a figure for demonstrating the procedure in the case of reproducing DV-SD data from a recording medium following MPEG2 data. It is a block diagram which shows the structure of the video reproduction apparatus which concerns on 2nd Embodiment. It is a figure for demonstrating the time (delay amount) required until MPEG2 data of a predetermined unit (for example, 1 GOP) is converted into DV-SD data. It is a flowchart explaining the reproduction | regeneration processing performed with the video reproduction apparatus which concerns on 1st and 2nd embodiment. It is a block diagram which shows the structure of the video reproduction apparatus which concerns on 3rd Embodiment. It is a figure for demonstrating the procedure in the case of reproducing | regenerating DV2 data following DV-SD data from a recording medium after MPEG2 data and DV2 SDL data. It is a flowchart explaining the reproduction | regeneration processing performed with the video reproduction apparatus which concerns on 3rd Embodiment. It is a figure for demonstrating the subject of the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Recording medium 102 Playback part 103 Format detection part 104 Switch 105 Buffer 106 MPEG decoder 107 DV-SD encoder 108 Switch 109 Digital interface part 110 Output terminal 111 Control part 401 Buffer 701 Recording medium 702 Playback part 703 Format detection part 704 Switch 705 Buffer 706 Buffer 707 DV-SDL decoder 708 MPEG decoder 709 DV-SD encoder 710 Switch 711 Digital interface unit 712 Output terminal 713 Control unit

Claims (26)

Reproduction means for reproducing the first video data encoded by the first encoding method and the second video data encoded by the second encoding method from the recording medium;
Decoding means for decoding the second video data;
Encoding means for encoding the video data decoded by the decoding means by the first encoding method;
Output means for outputting the first video data and the second video data encoded by the encoding means to the outside;
A delay unit that delays the first video data reproduced by the reproducing unit and supplies the first video data to the output unit at least during a period required for the decoding process by the decoding unit and the encoding process by the encoding unit;
A playback apparatus comprising: Reproduction means for reproducing the first video data encoded by the first encoding method and the second video data encoded by the second encoding method from the recording medium;
Decoding means for decoding the second video data;
Encoding means for encoding the video data decoded by the decoding means by the first encoding method;
Output means for outputting the first video data and the second video data encoded by the encoding means to the outside;
First delay means for delaying the first video data reproduced by the reproduction means for a first predetermined period and supplying the first video data to the output means;
Second delay means for supplying the second video data encoded by the encoding means to the output means after being delayed for a second predetermined period shorter than the first predetermined period;
A playback apparatus comprising: Reproduction means for reproducing the first video data encoded by the first encoding method and the second video data encoded by the second encoding method from the recording medium;
Decoding means for decoding the second video data;
Encoding means for encoding the video data decoded by the decoding means by the first encoding method;
Output means for outputting the first video data and the second video data encoded by the encoding means to the outside;
A period from when the first video data is reproduced by the reproducing means to when it is output from the output means, and the second video data is reproduced by the reproducing means, decoded by the decoding means, and the code A delay for delaying the first video data reproduced by the reproducing means and supplying the same to the output means so as to substantially match a period of time encoded by the converting means and outputted from the output means Means,
A playback apparatus comprising:   The playback apparatus according to any one of claims 1 to 3, wherein the first encoding method is an encoding method defined in an SD mode or an SDL mode of the DV standard.   5. The playback apparatus according to claim 1, wherein the second encoding method is an encoding method defined in the MPEG-2 standard. 6. A reproduction step of reproducing the first video data encoded by the first encoding scheme and the second video data encoded by the second encoding scheme from the recording medium;
A decoding step of decoding the second video data;
An encoding step of encoding the video data decoded in the decoding step by the first encoding method;
An output step of outputting the first video data and the second video data encoded in the encoding step to an external device via an output unit;
A delay step of delaying and supplying the first video data reproduced in the reproduction step to the output means for a period required for at least the decoding processing in the decoding step and the encoding processing in the encoding step;
A reproduction method characterized by comprising: A reproduction step of reproducing the first video data encoded by the first encoding scheme and the second video data encoded by the second encoding scheme from the recording medium;
A decoding step of decoding the second video data;
An encoding step of encoding the video data decoded in the decoding step by the first encoding method;
An output step of outputting the first video data and the second video data encoded in the encoding step to an external device via an output unit;
A first delay step of delaying the first video data reproduced in the reproduction step for a first predetermined period and supplying the first video data to the output means;
A second delaying step of supplying the second video data encoded in the encoding step to the output means after being delayed for a second predetermined period shorter than the first predetermined period;
A reproduction method characterized by comprising: A reproduction step of reproducing the first video data encoded by the first encoding scheme and the second video data encoded by the second encoding scheme from the recording medium;
A decoding step of decoding the second video data;
An encoding step of encoding the video data decoded in the decoding step by the first encoding method;
An output step of outputting the first video data and the second video data encoded in the encoding step to an external device via an output unit;
In the reproduction step, the period from the reproduction of the first video data to the output from the output means, and the second video data are reproduced, decoded, encoded and output from the output means. A delay step of delaying the first video data reproduced in the reproduction step and supplying the first video data to the output means so as to substantially match a period until
A reproduction method characterized by comprising:   The reproduction method according to any one of claims 6 to 8, wherein the first encoding method is an encoding method defined in the SD standard or SDL mode of the DV standard.   The reproduction method according to any one of claims 6 to 9, wherein the second encoding method is an encoding method defined in the MPEG-2 standard. Reproduction means for reproducing, from a recording medium, first video data encoded by a first encoding scheme and video data encoded by a plurality of encoding schemes different from the first encoding scheme;
Conversion means for converting video data encoded by an encoding scheme different from the first encoding scheme into video data of the first encoding scheme;
Output means for outputting the first video data and the video data of the first encoding method generated by the conversion means;
The period from when the first video data is played back by the playback means until it is output from the output means, and after the video data of a coding system different from the first coding system is played back, the conversion Delay means for delaying the video data reproduced by the reproduction means so as to substantially match a period from the conversion by the means to the output from the output means;
A playback apparatus comprising:   The delay unit includes a buffer memory, and the buffer memory uses the conversion unit to convert the second video data encoded by the second encoding method reproduced from the recording medium into the video by the first encoding method. The second encoding method is different from the first encoding method, and has a size sufficient to delay the video data reproduced by the reproducing means for a predetermined period required for the process of converting to data. 12. The reproducing apparatus according to claim 11, wherein among the plurality of encoding schemes, the encoding scheme takes the longest time to convert the video data to the first encoding scheme by the converting means.   The delay means outputs third video data encoded by an encoding method different from the first encoding method and the second encoding method reproduced by the reproducing means to the second encoding A delay is made according to a difference between a predetermined period required for the conversion process of the video data of the format by the conversion means and a predetermined period required for the conversion of the third video data by the conversion means. Item 13. The playback device according to Item 12. Reproduction means for reproducing, from a recording medium, first video data encoded by a first encoding scheme and video data encoded by a plurality of encoding schemes different from the first encoding scheme;
Decoding means for decoding video data encoded by an encoding method different from the first encoding method;
Encoding means for encoding the video data decoded by the decoding means into video data of the first encoding method;
Output means for outputting the first video data and the video data of the first encoding method encoded by the encoding means to the outside;
The period from when the first video data is reproduced by the reproducing means until it is output from the output means, and after the video data having an encoding method different from the first encoding method is reproduced, the code Delay means for delaying the video data reproduced by the reproducing means so as to substantially match a period of time encoded by the converting means and outputted from the output means;
A playback apparatus comprising:   The delay means includes a buffer memory, and the buffer memory uses the decoding means and the encoding means to output second video data encoded by the second encoding method reproduced from the recording medium. The second encoding method has a size sufficient to delay the video data reproduced by the reproducing means for a predetermined period required for processing for generating the video data by the encoding method, and the second encoding method is the first code Among the plurality of encoding methods different from the encoding method, the decoding method and the encoding unit are encoding methods that take the longest time to generate video data according to the first encoding method. The playback device according to claim 14.   The delay means outputs video data obtained by decoding the third video data encoded by the encoding means different from the first encoding method and the second encoding method reproduced from the recording medium by the decoding means. A period corresponding to a difference between a predetermined period required for the decoding process of the video data of the second encoding method by the decoding unit and a predetermined period required for the decoding process of the third video data by the decoding unit The playback apparatus according to claim 15, wherein the playback apparatus is delayed. A reproduction step of reproducing, from a recording medium, first video data encoded by a first encoding scheme and video data encoded by a plurality of encoding schemes different from the first encoding scheme;
A conversion step of converting video data encoded by an encoding scheme different from the first encoding scheme into video data of the first encoding scheme;
An output step of outputting the first video data and the video data of the first encoding method generated in the conversion step to an external device via an output unit;
In the reproduction step, the period from the reproduction of the first video data to the output from the output means, and the conversion after the reproduction of the video data of an encoding method different from the first encoding method A delay step of delaying the video data reproduced in the reproduction step so as to substantially match a period from conversion in the step to output from the output means;
A reproduction method characterized by comprising:   In the delaying step, a predetermined required for processing of converting the second video data encoded by the second encoding method reproduced from the recording medium into the video data by the first encoding method in the converting step. The video data reproduced in the reproduction step is delayed for a period of time, and the second encoding method is a plurality of encoding methods different from the first encoding method. 18. The reproducing method according to claim 17, wherein the encoding method takes the longest time to convert to video data by the encoding method.   In the delay step, third video data encoded by an encoding method different from the first encoding method and the second encoding method reproduced in the reproduction step is converted into the second encoding data. A delay is made according to a difference between a predetermined period required for the conversion process of the video data of the system by the conversion process and a predetermined period required for the conversion of the third video data by the conversion process. Item 19. A reproduction method according to Item 18. A reproduction step of reproducing, from a recording medium, first video data encoded by a first encoding scheme and video data encoded by a plurality of encoding schemes different from the first encoding scheme;
A decoding step of decoding video data encoded by an encoding method different from the first encoding method;
An encoding step of encoding the video data decoded in the decoding step into video data of the first encoding method;
An output step of outputting the first video data and the video data of the first encoding method encoded in the encoding step to an external device via an output unit;
In the reproduction step, the period from the reproduction of the first video data to the output from the output means, and the reproduction of the video data of an encoding method different from the first encoding method A delay step for delaying the video data reproduced in the reproduction step so as to substantially match a period from the encoding in the encoding step to the output from the output means;
A reproduction method characterized by comprising:   In the delaying step, the second video data encoded by the second encoding method reproduced from the recording medium is generated and the video data by the first encoding method is generated in the decoding step and the encoding step. The video data reproduced in the reproduction step is delayed for a predetermined period required for the processing to be performed, and the second encoding method is the decoding step among a plurality of encoding methods different from the first encoding method. 21. The reproduction method according to claim 20, wherein the encoding method takes the longest time to generate the video data according to the first encoding method by the encoding step.   In the delaying step, the video data obtained by decoding the third video data encoded by the encoding method different from the first encoding method and the second encoding method reproduced from the recording medium in the decoding step , A period according to a difference between a predetermined period required for the decoding process in the decoding step of the video data of the second encoding method and a predetermined period required for the decoding process in the decoding step of the third video data The reproduction method according to claim 21, wherein the reproduction is delayed.   A program for causing a control means in a playback apparatus to execute the playback method according to any one of claims 6 to 10.   A storage medium storing the program according to claim 23 in a computer-readable manner.   23. A program that causes a control unit in a playback apparatus to execute the playback method according to claim 17.   A storage medium storing the program according to claim 25 in a computer-readable manner.

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