JP2007028029A - Device and method for processing image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dubbing device converting a play list with the mixed data stream of a plurality of compressed formats into one data format and conducting a dubbing. <P>SOLUTION: In a device 100 for processing an image, when the play list containing the data stream of a plurality of the compressed formats recorded to first media 102 is dubbed to second media 103, the data stream is recorded to second media 103 as it is when the compressed format of the data stream at a time when the play list is dubbed to second media 103 determined by a compressed-format determining section 106 is the same as that recorded to first media 102. In the device 100 for processing the image, the data stream is converted into the compressed format determined by the compressed-format determining section 106 by a format converter 107, and the data stream is recorded to second media 102 when the compressed format of the data stream at the time when the play list is dubbed to second media 103 differs from that recorded to first media 102 in this case. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for dubbing a data stream recorded and compressed on a first medium to a second medium or outputting the data stream to an external device.

  Television signals of digital television such as BS digital broadcasting are transmitted in the form of MPEG2 transport stream. The MPEG2 transport stream is obtained by multiplexing compressed and encoded video and audio encoded streams. Also, when recording a video on a recording medium such as a DVD or a blue-ray disc (BD), an encoded stream obtained by multiplexing a compressed and encoded video and audio encoded stream is generally used. . In particular, the encoded stream written to the DVD is an MPEG2 program stream obtained by multiplexing video and audio encoded streams having the resolution of a standard television signal. The encoded stream written to the BD includes an MPEG2 transport stream obtained by multiplexing video and audio encoded streams having the resolution of a standard television signal, and video and audio encoding having a high-definition signal resolution. This is an MPEG2 transport stream obtained by multiplexing streams.

  Patent Document 1 discloses a dubbing apparatus for dubbing a program recorded on a hard disk into a plurality of optical disks, and a function of dubbing while re-encoding when dubbing from a hard disk to an optical disk is disclosed. .

In recent years, a recording apparatus (DVD recorder with HDD with built-in digital tuner) including a digital broadcast tuner, a hard disk drive (HDD), and a DVD has been manufactured as a consumer device. In such a device, dubbing between the HDD and the DVD is possible. When recording is performed on the HDD from the digital broadcast tuner, an MPEG2 transport stream is recorded on the HDD. When dubbing from the DVD to the HDD, the MPEG2 program stream is recorded on the HDD. As a result, the MPEG2 transport stream and the MPEG2 program stream are mixedly stored in the HDD.
JP 2004-127470 A

  In a DVD recorder with a digital tuner built-in HDD, a playlist including both an MPEG2 transport stream (hereinafter referred to as TS) and an MPEG2 program stream (hereinafter referred to as PS) recorded on the HDD is created, and the playlist When dubbing to a DVD, since the compression format recorded on the DVD is limited to PS, a format conversion process for decoding and encoding the entire playlist has been performed. However, although the PS portion in the playlist does not need to be subjected to the format conversion process, the format conversion process is performed, so that there is a problem that the image quality deteriorates and it takes time for the format conversion process.

  The present invention solves the above-described conventional problems, and a data stream that does not need to be subjected to format conversion processing when a playlist including a plurality of compressed format data streams is dubbed or output to another external device. An object is to provide a video processing apparatus and a video processing method in which, without performing format conversion processing, a single compression format is recorded on a dubbing destination medium or output to an external device.

  In order to solve the conventional problem, the video processing apparatus of the present invention includes a first medium capable of recording a plurality of compressed format data streams, a compression format determining unit that determines a compression format, and the first medium. When the data stream recorded on the medium is read, and the compression format of the read data stream is the same as the compression format determined by the compression format determination unit, the read data stream is output as it is, and the compression format is different The controller for controlling the read data stream to be input to the format conversion unit, and the compression format of the data stream read from the first medium and the compression format determined by the compression format determination unit are different The above Has been a data stream input from the controller, the compression format determining unit is configured with said format converter for converting the compression format determined.

  With this configuration, the video processing apparatus of the present invention can perform format conversion processing of a data stream that does not require format conversion processing when a playlist including a plurality of compressed format data streams is dubbed or output to another device. Can be converted into one compression format and recorded on a dubbing destination medium or output to an external device.

  The video processing method of the present invention also includes a compression format determination step for determining a compression format, a data stream recorded on a first medium capable of recording data streams of a plurality of compression formats, and the read data stream If the compression format determined in step 1 is the same as the compression format determined in the compression format determination step, the read data stream is output as it is, and if the compression format is different, a format conversion step is performed on the read data stream. The control step for controlling the data stream when the compression format of the data stream read from the first medium is different from the compression format determined in the compression format determination step. The input data stream in step, and a format conversion step for converting the compressed format determined by the compression format determining step.

  By using the video processing method of the present invention, there is the same operation as the above-described video processing apparatus of the present invention.

  According to the present invention, since the format conversion process is not performed on the data stream that does not need to be subjected to the format conversion process, the time required for the dubbing process can be reduced as compared with the conventional data stream, and the data stream in which the format conversion process is not performed. Image quality and sound quality will not deteriorate.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram of a video processing apparatus 100 according to the first embodiment. The video processing apparatus 100 includes a controller 101, a first medium 102, a second medium 103, a recording head 104, an external connection interface 105, a compression format determination unit 106, a format conversion unit 107, and a playlist. The acquisition unit 108, the playlist generation unit 109, the media determination unit 110, the display unit 111, and the input unit 112 are configured.

  In the following, a well-known MPEG2 transport stream (hereinafter referred to as TS) used in BS digital broadcasting and the like and a well-known VR format MPEG2 program stream (hereinafter referred to as PS) used in DVD-RAM are described. However, the present invention is not limited to these compression formats. Here, in TS, it is assumed that a video stream compressed and encoded by the MPEG2 video encoding method and an audio stream compressed and encoded by the AAC encoding method are multiplexed. In PS, MPEG2 video encoding is performed. It is assumed that the video stream compressed and encoded by the method and the audio stream compressed and encoded by the AC3 encoding method are multiplexed, but the format is not limited to these streams.

  Hereinafter, each component of the video processing apparatus 100 will be described.

  The controller 101 is a control unit that controls the entire video processing apparatus 100 such as a central processing unit (CPU). Then, the controller 101 reads the data stream from the first medium 102 and, based on the determination of the compression format determination unit 106 described later, the data stream read from the first medium 102 is used as it is or a format conversion unit described later. The compression format of the data stream is converted by 107 and recorded on the second medium 103 through the recording head 104 or outputted to an external device through the external connection interface 105 described later.

  The first medium 102 is a recording medium such as a hard disk, which is controlled by the controller 101, and a data stream and information are written and read by the controller 101. The data stream to be written includes a TS by digital broadcasting, a VR or video PS by copying a DVD, and a TS or PS encoded and recorded by analog television broadcasting.

  The second medium 103 is a detachable recording medium such as a DVD-RAM medium or an ultra-high density RAM medium, and a data stream is written and read through a recording head 104 described later. The ultra-high density RAM medium is, for example, a Blu-ray Disc (BD) medium, which can record a data stream with a larger capacity and a higher recording rate than a DVD-RAM medium. These are realized by forming small recording pits on the medium with a laser having a shorter wavelength than a red laser such as a blue laser. The capacity of the DVD-RAM medium is 4.7 GB and the recording rate is 22 Mbps, but the capacity of the ultra-high density RAM medium is 50 GB and the recording rate is 33 Mbps. If it is an ultra-high-density RAM medium, it is possible to record a digital broadcast TS while maintaining its data structure. When recording on one DVD-RAM medium, it must be recorded in the VR PS compression format. Although the second medium 103 is described together with the video processing apparatus 100 in FIG. 1, the second medium 103 is detachable and may not be considered as a component of the video processing apparatus 100.

  The recording head 104 is an optical pickup device. The recording head 104 is controlled by the controller 101 and emits a laser beam having a wavelength corresponding to the type of the loaded second medium 103 to the second medium 103, thereby the second medium 103. Data can be written to and read from 103.

  The external connection interface 105 is a connection terminal for connecting to an external device connected to the video processing apparatus 100. For example, it is a connection terminal capable of transmitting a data stream such as IEEE 1394, USB 2.0, and Ethernet (registered trademark). The external connection interface 105 is controlled by the controller 101, receives a data stream from the controller 101 and a format conversion unit 107 described later, and outputs the data stream to an external device connected to the video processing apparatus 100. In addition, the second playlist is input from the playlist generation unit 109 described later, and is output to the external device.

  The compression format determination unit 106 is controlled by the controller 101 and determines the compression format of the data stream output from the controller 101 and a format conversion unit 107 described later. Based on the determination by the compression format determination unit 106, the controller 101 outputs the data stream read from the first medium 102 as it is or outputs it to the format conversion unit 107 to convert the compression format and output it. Decide what to do. Specifically, the data stream read from the first medium 102 is controlled to output the data stream having the same compression format as the compression format determined by the compression format determination unit 106, and the compression format determination unit 106 determines A data stream of a compression format different from the compression format is output to the format conversion unit 107 and controlled to be converted. Further, the type of compression format input from the input unit 112 described later may be controlled to be the compression format determined by the compression format determination unit 106.

  The format conversion unit 107 is controlled by the controller 101 and is a data stream having a compression format different from the compression format determined by the compression format determination unit 106 among the data streams recorded on the first medium 102 read by the controller 101. Is converted into a compression format determined by the compression format determination unit 106 and output to the recording head 104 and the external connection interface 105.

  For example, when the second medium 103 is a DVD-RAM and a data stream recorded on the first medium 102 is dubbed to the second medium 103, the compression format determination unit 106 is first controlled by the controller 101. The compression format of the data stream output to the second medium 103 is determined to be a VR PS. Then, among the data streams read from the first medium 102, a data stream in a compressed format other than the VR format PS (TS or video format PS data stream) is input, converted to a VR format PS, and recorded. Recording is performed on the second medium 103 through the head 104. The data stream recorded in the VR format PS is recorded on the second medium 103 through the recording head 104 by the controller 101 as it is. These processes are moving processes in which data is deleted from the first medium 102 and recorded in the second medium 103 even in a copy process in which data is left on the first medium 102 and recorded in the second medium 103. May be.

  The playlist acquisition unit 108 is controlled by the controller 101 and acquires the first playlist recorded on the first medium 102. Here, the first playlist is a playlist including a plurality of types of data streams such as PS and TS recorded on the first medium, and each data stream of PS and TS is reproduced. This is a recording of information such as the order and the position in the first medium 102 in which those data streams are recorded. Further, the first playlist may not be recorded on the first medium 102 but may be recorded in a memory (not shown) in the video processing apparatus 100. In this case, the playlist acquisition unit 108 The first playlist is acquired from a memory (not shown) in which the first playlist is recorded.

  The playlist generation unit 109 is controlled by the controller 101 and generates a second playlist. Here, the second playlist is a playlist of data streams recorded on the second medium 103 or outputted to an external device through the external connection interface 105 and compressed in one compression format. This is a recording of information such as the order in which the data streams are reproduced, the second medium 103 on which the data streams are recorded, and the position in the external device to be output. Then, the generated second playlist is recorded on the second medium 103 through the recording header 104 or input from the external connection interface 105. In addition, the second play list is not recorded on the second medium 103 through the recording header 104 but is recorded on a memory (not shown) or the like, and is read by the controller 101 when the second medium 103 is reproduced. You may be able to do that.

  The media determination unit 110 is controlled by the controller 101 and determines the type of the second medium 103 loaded in the video processing apparatus 100. For example, discrimination information for specifying the type of the second medium 103 is recorded at the time of manufacture on the inner peripheral portion on the recording surface side of the second medium 103, and the media discrimination unit 110 optically uses the recording head 104. What is necessary is just to read discrimination | determination information. Alternatively, since the intensity of the reflected light varies depending on the type of the second medium 103 when the laser beam is irradiated, it is only necessary to detect the intensity and determine the type of the second medium 103 in the media determination unit 110. . Alternatively, when the second medium 103 is loaded in a state of being accommodated in the cartridge, the determination may be made according to the shape of the cartridge that differs depending on the type of the second medium 103. In any case, detection may be performed using the optical characteristics and physical characteristics of the loaded second medium 103.

  The display unit 111 is controlled by the controller 101, and is a compression format candidate that can be recorded or output when a data stream is recorded on the second medium 103 through the recording head 104 or when a data stream is output from the external connection interface 105. Is displayed as an option to be selected by the user, and the user can visually recognize these candidates. For example, it may be an electric display tube, a liquid crystal panel or the like installed on the front panel, or a graphical user interface such as an on-screen display which is displayed on a television screen so as to be superimposed on another video. .

  In addition, when the type of the second medium 103 can be specified by the medium determination unit 110, the compression format that can be recorded on the specified second medium 103 is displayed as an option on the display unit 111 and cannot be recorded. The compressed format is not displayed as an option. For example, when the media discriminating unit 110 discriminates the second medium 103 as a DVD-RAM, the display unit 111 displays a PS in VR format as an option, and the media discriminating unit 110 designates the second media 103 as a DVD-R. When it is determined, the display unit 111 displays the PS in the VR format and the PS in the video format as options. Further, when a DVD-RAM is loaded as the second medium 103, since the compression format to be recorded is determined to be the VR format, it may be displayed that the compression format has been determined to be VR. .

  In addition, the display unit 111 performs a compression rate (video / audio sampling for determining the type of video resolution after conversion and encoding parameters necessary for video / audio encoding, which are performed in a format conversion process described later. (Rate) type may be displayed.

  The input unit 112 is an input interface that is controlled by the controller 101 and is selected and input from the options to set the compression format desired by the user from among the compression format options displayed on the display unit 111. For example, it is realized as buttons or switches arranged on the front panel of the recording apparatus, a remote controller, a numeric keypad, or a graphical user interface on the screen. The input unit 112 notifies the controller 101 of information indicating the selected compression format. Under the control of the controller 101, the input unit 112 converts the compression format selected by the input unit 112 into the second medium 103. The compression format to be recorded or output to the external connection interface 105 is determined. The input unit 112 may be an input interface that can select and input the type of video resolution and the type of video / audio compression rate displayed by the display unit 111.

  Next, a more specific configuration of the format conversion unit 107 will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of the format conversion unit 107 in the first embodiment. The format conversion unit 107 includes a system decoder 201, a video decoder 202, a resolution determination unit 203, a converter 204, a video encoder 205, an audio decoder 206, an audio encoder 207, and a system encoder 208. After the stream 301 is input and converted, the converted data stream 312 is output.

  The system decoder 201 analyzes the data stream 301 input by the controller 101 and separates it into a video stream 302 and an audio stream 303. This data stream 301 is a TS or PS.

  The video decoder 202 decodes the video stream 302 and outputs a decoded video 304. Then, the resolution determination unit 203 detects the video resolution of the decoded video 304. For example, if horizontal sample × vertical sample × frame frequency, 1920 × 1080 × 29.97, 1440 × 1080 × 29.97, 1280 × 720 × 59.94, 720 × 480 × 59.94, 720 × 480 × 29 Detect video resolution of 97, etc. The resolution discriminating unit 203 detects the video resolution by reading the resolution information indicating the video resolution written in the management information of the video stream. For example, in MPEG2 video, resolution information is described in a sequence header. In this embodiment, the decoding process is performed according to the MPEG2 video format standard, but the present invention is not limited to this.

  The converter 204 is a converter that changes the video resolution of the decoded video 304 decoded by the video decoder 203, and has functions of a down converter that lowers the video resolution, an up converter that increases the video resolution, or both a down converter and an up converter. Is. Then, the video resolution of the decoded video 304 is converted to the resolution of the video input by the input unit 112 and the video 305 is output. For example, if the decoded video 304 has a video resolution of 1280 × 720 × 59.94, and the video resolution of 720 × 480 × 29.97 is specified by the input unit 112, the converter 204 is 720 × 480 × 29. Convert to 97 video resolution. If the decoded video 304 has a video resolution of 720 × 480 × 29.97 and the video resolution of 720 × 480 × 29.97 is specified by the input unit 112, the conversion processing is performed because the resolution is the same. Instead, the decoded video 304 is output as the video 305 as it is.

  The video encoder 205 encodes the converted video 305 and outputs a video stream 307. The encoding parameter 306 necessary for the encoding process is supplied from the controller 101 and is determined based on the compression rate input by the input unit 112. Note that the encoding method may be encoded by the MPEG2 video encoding method, but is not limited to this.

  The audio decoder 206 decodes the audio stream 303 and outputs decoded audio 308. Decoding processing is performed by an AAC encoding method, an AC3 encoding method, or the like.

  The audio encoder 207 is generated based on the compression rate input from the input unit 112, encodes the decoded speech 308 according to the encoding parameter supplied from the controller 101, and outputs an audio stream 310. The encoding process may be executed based on the MPEG1 audio layer 2 method or the like, but is not limited to this.

  The system encoder 208 multiplexes the video stream 307 and the audio stream 310 and outputs an encoded data stream 312. Further, the data stream 312 output at this time is encoded in the compression format determined by the compression format determination unit 106, and selectively outputs a TS in the TS or VR format, a PS in the video format, or the like. Which one is selected is controlled based on a control signal 311 from the controller 101.

  As described above, the format conversion unit 107 re-encodes the video and audio of the input data stream 301 with a predetermined encoding parameter, and outputs it as a data stream 312 such as an MPEG2 program stream or an MPEG2 transport stream. .

  When the input video and audio encoding parameters are the same, it is only necessary to convert the MPEG2 transport stream into an MPEG2 program stream without performing the video and audio re-encoding processing. The output video stream 302 and audio stream 303 may be input to the system encoder 208, and the system encoder 208 may execute the system encoding process.

  Similarly, when re-encoding only video or audio, only a signal to be re-encoded is decoded and re-encoded, and a stream not to be re-encoded is directly input to the system encoder 208. Good.

  In the re-encoding process, the decoded signal obtained by the decoding process is encoded again. However, the present invention is not limited to this, and only a part of the decoding process is performed and a part of the decoded process is performed. It is also possible to perform the encoding process again only for. For example, in the decoding process of the MPEG encoding method using the DCT encoding process, the inverse DCT transform may be performed after obtaining the DCT coefficient by dequantizing the variable length decoded symbol. Thereby, a decoded video signal is obtained. In the encoding process, a DCT coefficient obtained by the DCT conversion process may be quantized and a variable length encoding process may be performed. Thereby, a video stream can be obtained. However, the video decoder 202 may perform processing up to returning to the DCT coefficient. In this case, the video encoder 205 can obtain a video stream 307 by performing quantization processing on the decoded DCT coefficients according to the encoding parameter and performing variable-length encoding processing. Thereby, the inverse DCT conversion process of the video decoder 202 and the DCT conversion process of the video encoder 205 can be omitted.

  In addition, when motion compensation prediction encoding is performed as in the MPEG encoding method, re-encoding processing may be performed using a motion vector included in an input video stream. In this way, the motion vector detection process in the video encoder 205 can be omitted.

  Also, the output processing for outputting the data stream from the controller 101 as it is and the conversion output processing for converting the compression format by the format conversion unit 107 and outputting the converted data stream operate on the same processor. When implemented by a computer program, the two computer programs may be executed in a time-sharing manner and apparently operated in parallel. In this way, while one of the processes is being executed, the other process can be performed in parallel using the standby state of the processor, so that the speed can be increased. Of course, if both processes are performed using separate processors, parallel operation is always possible, so that the processing speed can be increased. These computer programs can be recorded on a recording medium such as an optical recording medium typified by an optical disk, a semiconductor recording medium typified by a memory card or an EEPROM, or a magnetic recording medium typified by a flexible disk. Note that the video processing apparatus 100 can acquire a computer program not only via a recording medium but also via an electric communication line such as the Internet.

  Next, the operation of the video processing apparatus 100 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the video processing apparatus 100 according to the present embodiment, and shows a case where a data stream is recorded on the second medium 103. Also, the first playlist is recorded on the first medium 102, and the second playlist is recorded on the second medium 103.

  In FIG. 3, first, the media discrimination unit 110 discriminates the type of the second media 103 loaded in the video processing device 100 (step S100). Then, the display unit 111 displays the type of compression format that can be written to the second medium 103 whose type has been determined (step S101). The user selects and inputs a compression format to be recorded on the second medium 103 from among the compression formats displayed on the display unit 111 by the input unit 112 (step S102). The compression format determination unit 106 determines that the compression format input by the input unit 112 is a compression format to be recorded on the second medium 103 (step S103). The playlist acquisition unit 108 acquires the first playlist from the first medium 102, and the controller 101 analyzes the compression format of the data stream in the first playlist (step S104). The controller 101 reads the data stream included in the first playlist from the first medium 102 (step S105).

  Here, it is determined whether the data stream read from the first medium 102 is the same as the compression format determined by the compression format determination unit 106 in step S103, and if the compression format is the same, the process proceeds to step S107. If the formats are different, the process proceeds to step S108 (step S106).

  First, if it is determined in step S106 that the compression format is the same, a data stream having the same compression format is output to the recording head 104 as it is (step S107). If it is determined in step S106 that the compression format is different, the data stream is output to the format conversion unit 107, the process proceeds to a format conversion process described later (step S108), and then the format conversion process is performed (step S109). . In the format conversion process in step S109, the data stream 312 is output, and the data stream 312 is output to the recording head 104 (step S110).

  Then, the data streams output to the recording head 104 in step S107 and step S110 are respectively written to the second medium 103 (step S111).

  It is determined whether reading from the first playlist has been completed. If there is a data stream to be read, the process returns to S105 (step 112).

  Finally, the controller 101 controls the playlist generation unit 109 to generate a second playlist for collecting the data streams recorded on the second medium 103, and to the second medium 103 through the recording head 104. Writing and operation are finished (step S113).

  Next, the operation of the format conversion process in step S109 will be described. FIG. 4 is a flowchart showing the format conversion process.

  First, the data stream 301 input to the format conversion unit 107 is input to the system decoder 201 and separated into a video stream 302 and an audio stream 303 (step S200). Then, it is determined whether or not the separated stream is a video stream. If the stream is a video stream, the video stream 303 is input to the video decoder 202 to be decoded, and the process proceeds to step S202. The stream 303 is input to the audio decoder 206, and the process is divided into step S206 for decoding (step S201). Note that step S201 may be any process that can distinguish the two streams in order to perform different decoding processes on the video stream 302 and the audio stream 303, respectively.

  Then, the video decoder 202 decodes the video stream 302 to generate a decoded video 304 (step S202). The resolution determination unit 203 determines the video resolution of the decoded video 304 that has been decoded (step S203). At this time, the type of video resolution that can be converted is displayed on the display unit 111 under the control of the controller 101, and the video resolution desired by the user is input from the input unit 112. If the video resolution of the decoded video 304 determined by the resolution determination unit 203 is different from the video resolution input from the input unit 112, the video resolution of the decoded video 304 is converted to the input video resolution, If it is the same, the video is output as it is without converting the resolution (step S204). Under the control of the controller 101, the type of compression rate that determines the image quality of the video is displayed on the display unit 111. The user selects and inputs the displayed compression rate with the input unit 112, and the input compression rate is set to the input compression rate. Based on this, a video encoding parameter 306, which is a parameter necessary for encoding the video 305, is determined, and the video decoder 205 encodes the video 305 based on the video encoding parameter, and a video stream 307 is generated. (Step S205).

  Also, the audio decoder 206 decodes the audio stream 303 to generate decoded audio 308 (step S206). Then, under the control of the controller 101, the type of compression rate that determines the sound quality of the sound is displayed on the display unit 111, and the user selects and inputs the compression rate displayed on the display unit 111 by the input unit 112 and is input. The audio encoding parameter 309, which is a parameter necessary for encoding the decoded speech 308, is determined based on the compression rate, and the audio encoder 207 encodes the decoded speech 308 based on the audio encoding parameter. An audio stream 310 is generated (step S207).

  Then, the video stream 307 and the audio stream 310 obtained after step S205 and step S207 are multiplexed and encoded by the system encoder 208 according to the compression format determined by the compression format determination unit in step S103, and the data stream 312 is output. Then, the format conversion processing operation ends (step 208).

  As described above, in the video processing apparatus 100 according to the present embodiment, the video processing apparatus 100 converts a playlist including a plurality of compressed format data streams recorded on the first medium 102 to the second medium 103. When data is dubbed or output to an external device via the external interface 105, the compression format of the data stream to be recorded or output is determined by the compression format determination unit 106, and the compression determined by the compression format determination unit 106 When the format and the compression format of the data stream recorded on the first medium 102 are the same, the data stream is recorded or output as it is, and when the format is different, the data stream is converted into the compression format determined by the compression format determination unit In a playlist in which data streams of a plurality of compression formats are mixed, the data stream is converted to one compression format without performing the format conversion process of the data stream that does not need to be converted, Recording or output can be performed.

  Thereby, since the format conversion process is not performed on the data stream that does not need to be subjected to the format conversion process, the time required for the dubbing process can be reduced as compared with the conventional case. However, in this embodiment, the format conversion processing of the data stream that does not need to be performed in the format is not performed. Therefore, the data stream in which the format conversion processing is not performed. Since no new noise is generated and the same data as the original data can be recorded and stored, image quality and sound quality are not deteriorated.

  According to the present invention, it is possible to perform dubbing by converting a playlist composed of data streams of a plurality of recording formats existing on the first medium into one recording format on the first medium.

The block diagram which shows the structure of the video processing apparatus by embodiment of this invention The block diagram which shows the structure of the format conversion part in the video processing apparatus Flow chart showing operation of the video processing apparatus Flowchart showing format conversion processing operation in the video processing apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Video processing apparatus 101 Controller 102 1st medium 103 2nd medium 104 Recording head 105 External connection interface 106 Compression format determination part 107 Format conversion part 108 Playlist acquisition part 109 Playlist production | generation part 110 Media discrimination | determination part 111 Display part 112 Input unit 201 System decoder 202 Video decoder 203 Resolution determination unit 204 Converter 205 Video encoder 206 Audio decoder 207 Audio encoder 208 System encoder

Claims (28)

A first medium capable of recording a plurality of compressed format data streams;
A compression format determination unit for determining a compression format;
A format converter that converts the input data stream to the compression format determined by the compression format determination unit and outputs the data stream recorded on the first medium, and a compression format of the read data stream; When the compression format determined by the compression format determination unit is the same, the read data stream is output as it is, and when the compression format is different, the read data stream is input to the format conversion unit. A video processing apparatus comprising a controller. The video processing apparatus according to claim 1, further comprising a recording unit configured to record the data stream output from the controller and the format converter on a removable second medium. The video processing apparatus according to claim 1, further comprising an external connection interface that outputs a data stream output from the controller and the format conversion unit to an external device. A playlist acquisition unit that acquires a first playlist that is information for collecting a plurality of data streams read by the controller into one reproduction unit under the control of the controller;
A playlist that generates a second playlist for grouping data streams output from the controller and the format conversion unit into one playback unit based on the acquired first playlist under the control of the controller. The video processing apparatus according to claim 1, further comprising a generation unit. A playlist acquisition unit that acquires a first playlist that is information for collecting a plurality of data streams read by the controller into one reproduction unit under the control of the controller;
A playlist that generates a second playlist for grouping data streams output from the controller and the format conversion unit into one playback unit based on the acquired first playlist under the control of the controller. A generator,
The video processing apparatus according to claim 2, wherein the recording unit records the generated second playlist on the second medium. A playlist acquisition unit that acquires a first playlist that is information for collecting a plurality of data streams read by the controller into one reproduction unit under the control of the controller;
A playlist that generates a second playlist for grouping data streams output from the controller and the format conversion unit into one playback unit based on the acquired first playlist under the control of the controller. A generator,
The video processing apparatus according to claim 3, wherein the external connection interface outputs the generated second playlist to an external device. The video processing apparatus according to claim 4, wherein the playlist acquisition unit acquires the first playlist from the first medium. The format conversion unit is capable of converting an MPEG2 transport stream into an MPEG2 program stream and converting from an MPEG2 program stream into an MPEG2 transport stream.
The playlist acquisition unit acquires the first playlist including one or both of an MPEG2 transport stream and an MPEG2 program stream recorded on the first medium;
The video processing apparatus according to claim 4, wherein the playlist generation unit generates the second playlist including a data stream in a compression format of either an MPEG2 program stream or an MPEG2 transport stream. The video processing according to any one of claims 1 to 8, wherein the control unit controls the output of the data stream by the control unit and the conversion output by the format conversion unit so as to operate in parallel. apparatus. A display unit for displaying the type of compression format of the data stream output from the controller and the format conversion unit;
An input unit for selecting one of the displayed compression formats;
The video processing apparatus according to claim 1, wherein the compression format input by the input unit is a compression format determined by the compression format determination unit. A media discrimination unit for discriminating the type of the second media;
6. The video processing apparatus according to claim 2, wherein the controller controls a compression format determined by the compression format determination unit based on a type of the second disk determined by the media determination unit. A media discrimination unit for discriminating the type of the second media;
A display unit for displaying the type of compression format of the data stream output from the controller and the format conversion unit;
An input unit for selecting one of the displayed compression formats;
Based on the type of the second medium determined by the medium determination unit, the display unit displays a compression format type, and the compression format determination unit determines the compression format input by the input unit. The video processing apparatus according to claim 2 or 5. The format conversion unit can convert the compression rate of the data stream,
The display unit displays the compression rate of the data stream that can be converted by the format conversion unit,
The said input part can select and input the compression rate displayed by the said display part, The said format conversion part converts the compression rate of a data stream into the compression rate input by the said input part. The video processing apparatus according to claim 12. The format converter
When the compression rate of the data stream recorded on the first medium is smaller than the compression rate input at the input unit, the data stream is converted at the compression rate input from the input unit, and the first stream 14. The video processing apparatus according to claim 13, wherein when the compression rate of the data stream recorded on the medium is equal to or higher than the compression rate input by the input unit, the compression rate of the data stream is not changed. A compression format determination step for determining a compression format;
A format conversion step of converting and outputting the input data stream to the compression format determined in the compression format determination step;
When a data stream recorded on a first medium capable of recording a plurality of compression format data streams is read, and the compression format of the read data stream is the same as the compression format determined in the compression format determination step, A video processing method comprising: a control step for outputting the read data stream as it is and controlling the read data stream to perform a format conversion step when the compression format is different. The video processing method according to claim 15, further comprising a recording step of recording the data stream output in the control step and the format conversion step on a detachable second medium. The video processing method according to claim 15 or 16, further comprising an external connection step of outputting the data stream output in the control step and the format conversion step to an external device through an external connection interface for connection to the external device. . A playlist acquisition step of acquiring a first playlist which is information for collecting a plurality of data streams read out in the control step into one reproduction unit by the control in the control step;
Based on the acquired first playlist, a second playlist is generated to combine the data streams output in the control step and the format conversion step into one playback unit under the control of the control step. The video processing method according to any one of claims 15 to 17, further comprising: a playlist generation step. A playlist acquisition step of acquiring a first playlist which is information for collecting a plurality of data streams read out in the control step into one reproduction unit by the control in the control step;
Based on the acquired first playlist, a second playlist is generated to combine the data streams output in the control step and the format conversion step into one playback unit under the control of the control step. And a playlist generation step to
The video processing method according to claim 16, wherein the recording step records the generated second playlist on the second medium. A playlist acquisition step of acquiring a first playlist which is information for collecting a plurality of data streams read out in the control step into one reproduction unit by the control in the control step;
Based on the acquired first playlist, a second playlist is generated to combine the data streams output in the control step and the format conversion step into one playback unit under the control of the control step. And a playlist generation step to
The video processing method according to claim 17, wherein the external connection step outputs the generated second playlist to an external device. 21. The video processing method according to claim 18, wherein the playlist acquisition step acquires the first playlist from the first medium. In the format conversion step, conversion from an MPEG2 transport stream to an MPEG2 program stream and conversion from an MPEG2 program stream to an MPEG2 transport stream are possible.
In the playlist acquisition step, the first playlist including one or both of an MPEG2 transport stream and an MPEG2 program stream recorded on the first medium is acquired;
19. The video processing method according to claim 18, wherein, in the playlist generating step, the second playlist including a data stream having a compression format of either an MPEG2 program stream or an MPEG2 transport stream is generated. The video processing according to any one of claims 15 to 22, wherein in the control step, the output of the data stream in the control step and the conversion output in the format conversion step are controlled to operate in parallel. Method. A display step for displaying the type of compression format of the data stream output in the control step and the format conversion step;
An input step for selecting one of the displayed compression formats.
The video processing method according to any one of claims 15 to 23, wherein the compression format input in the input step is a compression format determined in the compression format determination step. A media discrimination step for discriminating the type of the second media;
20. The video processing method according to claim 16 or 19, wherein in the control step, the compression format determined in the compression format determination step is controlled based on the type of the second disc determined in the media determination step. . A media discrimination step for discriminating the type of the second media;
A display step for displaying the type of compression format of the data stream output in the control step and the format conversion step;
An input step for selecting one of the displayed compression formats.
Compression that displays the type of the compression format in the display step based on the type of the second medium determined in the media determination step, and determines the compression format input in the input step in the compression format determination step The video processing method according to claim 16 or 19, wherein the format is a format. In the format conversion step, the compression rate of the data stream can be converted,
In the display step, the compression rate of the data stream that can be converted in the format conversion step is displayed,
25. In the input step, the compression rate displayed in the display step can be selected and input, and the compression rate input in the input step is set as the compression rate of the data stream in the format conversion step. The video processing method according to claim 26. In the format conversion step,
When the compression rate of the data stream recorded on the first medium is smaller than the compression rate input in the input step, the data stream is converted at the compression rate input in the input step, and the first stream 28. The video processing method according to claim 27, wherein the compression rate of the data stream is not changed when the compression rate of the data stream recorded on the medium is equal to or higher than the compression rate input in the input step.

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