JP2018056948A - Encoder device and encoding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an encoder device that can easily construct a system without being influenced by data decoding schemes different at monitor sides in a video monitoring system and has high compatibility with existing devices.SOLUTION: An encoder device includes encoders 14, 15, 16, 17 compatible with four respective types of encoding schemes. If an input scheme of video data received from a monitoring camera 20 is HD-SDI, a video transmission encoding scheme setting unit 12a selects and sets a three-scheme simultaneous encoding scheme of a transmission mode 1 or a transmission mode 2, and if the input scheme is SD-SDI or NTSC, it selects and sets a three-scheme simultaneous encoding scheme of a transmission mode 3. Further, the encoder device transmits video data simultaneously encoded (compressed) by three types of encoding schemes of H.264.HD/SD, MPEG 2 and JPEG to respective decoder devices of each monitor.SELECTED DRAWING: Figure 2

Description

  Embodiments described herein relate generally to an encoder apparatus and an encoding method used for encoding video data shot in a video surveillance system, for example.

  For example, as a video monitoring system for disaster monitoring, a plurality of surveillance cameras are installed in the basin of a dam or river, and each surveillance video taken by the plurality of surveillance cameras is managed by the Regional Development Bureau, etc. Some of them are displayed on a monitor (image display device) for monitoring.

  In such a video surveillance system, the surveillance video taken by the surveillance camera is transmitted to the monitor side via an IP-based network such as a wide area Ethernet (registered trademark), but the video signal has a large amount of information as it is. It is difficult to handle. For this reason, the video data of the surveillance video obtained by the surveillance camera is encoded (compressed) according to a data encoding method set in advance by the encoder device, and transmitted to the decoder device (IP tuner) on the monitor side. The encoded (compressed) video data is decoded (expanded) and displayed on the monitor.

  At this time, the decoder device needs to decode (decompress) the encoded (compressed) video data by a data decoding method corresponding to the data encoding method in the encoder device. Currently, the data encoding (compression) method is [VP9] [H. [264] [MPEG-4] [-2] [-1] [JPEG (still image)] and the like, and a high-compression and high-quality encoding method has been developed along with technological innovation.

  In addition, the monitor is, for example, in a monitoring facility that supervises a monitoring area where a surveillance camera is installed, a monitoring facility that supervises a plurality of monitoring areas, and a monitoring facility that supervises a wider monitoring area. For this reason, it is necessary to install a decoder device in each monitoring facility and display the monitoring video on the monitor.

JP 2007-087771 A JP 2012-227602 A JP 2010-068189 A

  The decoder devices installed in each of the plurality of monitoring facilities of the video monitoring system are in a situation where old and new decoder devices, that is, decoder devices having different data decoding methods are mixed due to individual management circumstances of each monitoring facility. ing.

  In such a situation, in order to display the video data of the monitoring video captured by the monitoring camera on the monitor of each monitoring facility, it is affected by the data decoding method mixed in each decoder device in each monitoring facility. It will be. For example, the video data of the surveillance video must be compressed using a plurality of encoder devices with different data encoding methods and transmitted to the decoder device of each corresponding surveillance facility, which is an obstacle to system construction. ing.

  The problem to be solved by the present invention is that an existing encoder device with high affinity that can be easily constructed in a video surveillance system or the like without being affected by different data decoding methods on each monitor side And providing an encoding method.

  The encoder apparatus according to the embodiment includes a plurality of video encoding units for encoding video data with different types of encoding methods for input video data, and different types of codes by the plurality of video encoding units. Encoding scheme setting means for setting a combination of any of a plurality of encoding schemes as a transmission encoding scheme, and a plurality of encoding schemes set by the transmission encoding scheme setting means Encoding output control means for encoding and outputting the input video data by a plurality of the video encoding means corresponding to the combination.

Schematic which shows the whole structure of the video surveillance system provided with the encoder apparatus 10 (10A-10C) of embodiment. FIG. 2 is a block diagram showing a functional configuration of the encoder device 10. The figure which shows the combination pattern of three types of 3 system simultaneous encoding systems which can be selectively set according to the video data input system by the video transmission encoding system setting part 12a of the encoder apparatus 10. The figure which shows the combination pattern of three types of 2 system simultaneous encoding systems which can be selectively set according to the video data input system by the video recording encoding system setting part 12b of the encoder apparatus 10.

  Hereinafter, an encoder apparatus and an encoding method according to an embodiment will be described with reference to the drawings.

  FIG. 1 is a schematic diagram illustrating an overall configuration of a video monitoring system including an encoder device 10 (10A to 10C) according to an embodiment.

  This video surveillance system includes a plurality of (for example, three) surveillance cameras 20A, 20B, and 20C, encoder devices 10A, 10B, and 10C connected to each of the surveillance cameras 20A, 20B, and 20C, and a plurality of surveillance facilities (for example, three locations). Decoder devices 30A and 30B, personal computers PC, and monitors (image display devices) 40A and 40B connected to the decoder devices 30A and 30B. The personal computer PC also serves as a decoder device and a monitor.

  The encoder devices 10A, 10B, and 10C on the monitoring camera side and the decoder devices 30A, 30B, and PC on the monitor side are communicatively connected via, for example, a wide area network NW dedicated to the installer of the video monitoring system.

  Each of the monitoring cameras 20A to 20C is installed, for example, in a location to be monitored in a basin of a dam or river, takes a video around the location, and each video data of the taken video (monitoring video) Output to the devices 10A to 10C. The resolution (image quality) of each of the monitoring cameras 20A to 20C is a mixture of HD (High Definition video) and SD (Standard Definition video). In this embodiment, the monitoring camera 20A is an HD camera, and the captured video data (monitoring video 1) is output by an HD-SDI (Serial Digital Interface) system. The monitoring cameras 20B and 20C are SD cameras, and the captured video data (monitoring videos 2 and 3) is output by the NTSC (National Television System Committee) system.

  The encoder devices 10A to 10C match the video data of the monitoring videos 1, 2, and 3 input from the corresponding monitoring cameras 20A to 20C with the composite methods of the decoder devices 30A, 30B, and PC on the monitor side. A plurality of encoding (compression) systems (for example, three types of encoding systems) are simultaneously compressed, and video data packets compressed by the respective encoding systems are sent to the decoder devices 30A and 30B via the wide area network NW. , Send to PC by multicast.

  Each of the decoder devices 30A, 30B, and PC is installed in a plurality of monitoring facilities having jurisdiction over the monitoring area where the monitoring cameras 20A to 20C are installed, for example, and is encoded from the encoder devices 10A to 10C by a plurality of encoding methods. Packets of encoded (compressed) video data (monitored videos 1 to 3) transmitted by multicast are selectively received in correspondence with the decoding methods of the decoder devices 30A, 30B and the PC themselves, The received video data (monitoring videos 1 to 3) is decoded. The decoded video data of the monitoring videos 1 to 3 is displayed as a divided screen on the display units of the corresponding monitors 40A and 40B and PC.

  In the present embodiment, the decoding method of the decoder device 30A is [H. H.264 SD] (hard decoder), the decoding method of the decoder device 30B is [MPEG2] (hard decoder), and the decoding method of the personal computer (decoding device) PC is [JPEG (still video (intermittent))] (soft decoder). is there. Therefore, among the video data (packets) of the monitoring videos 1 to 3 transmitted by being encoded (compressed) by a plurality of encoding methods from each of the encoder devices 10A to 10C, the decoder device 30A has its decoding method. [H. H.264 SD] is selected and received as video data (packets) of each of the monitoring videos 1 to 3, and the decoder device 30B corresponds to the decoding method [MPEG2]. The video data (packets) of each of the monitoring videos 1 to 3 that have been encoded (compressed) are selected and received, and the decoder device PC performs encoding (compression) corresponding to the decoding method [JPEG]. The selected video data (packets) of the monitoring videos 1 to 3 are selected and received.

  As described above, each of the encoder devices 10A to 10C simultaneously compresses the video data of the monitoring videos 1, 2, and 3 input from the corresponding monitoring cameras 20A to 20C using a plurality of encoding (compression) methods. It has a function to transmit by multicast. In the present embodiment, each of the encoder devices 10A to 10C has four types of encoding schemes [H. H.264 HD] [H. H.264 SD] [MPEG2] [JPEG] has a built-in encoding function, and three types of simultaneous encoding schemes (triple encoder schemes) (combinations are set in advance according to the video data input scheme described later) ( 3), any one of the three simultaneous encoding methods is selected and set by the user, and the three types of encoding methods are simultaneously encoded.

  The encoder 20A converts the video data (HD-SDI) of the monitoring video 1 into three types of encoding methods [H. H.264 HD] [MPEG2] [JPEG] are simultaneously encoded and transmitted, and the encoders 20B and 20C convert the video data (NTSC) of the corresponding monitoring videos 2 and 3 into three types of encoding schemes [H. H.264 SD] [MPEG2] [JPEG] are simultaneously encoded and transmitted.

  In addition, each of the encoder devices 10A to 10C encodes (compresses) the video data of the monitoring video from the corresponding monitoring cameras 20A to 20C at the same time by a plurality of encoding methods, so that the portable recording such as a memory card is possible. It has a function of recording on a medium. Here, of the two simultaneous encoding methods (see FIG. 4), which are set in advance according to the video data input method described later, any two simultaneous encoding methods are selected and set by the user. Thus, encoding is simultaneously performed by two types of encoding methods. The video data of the surveillance video recorded on this recording medium is taken out of the recording medium when the communication connection between the camera side and the monitor side is interrupted due to the occurrence of a disaster, etc. This is used to check the monitoring video before and after blocking.

  FIG. 2 is a block diagram showing a functional configuration of the encoder device 10.

  In the figure, an encoder device 10A that encodes (compresses) video data (HD-SDI) of surveillance video 1 captured by the surveillance camera 20A is shown.

  The encoder device 10A includes a control unit (CPU) 11 that is a computer.

  The CPU 11 controls the operation of each part of the encoder device 10A according to the encoder control program stored in advance in the program memory 12 and executes various functions described in detail below.

  In addition to the program memory 12, the CPU 11 has a video transmission encoding method setting unit 12a, a video recording encoding method setting unit 12b, a video receiving unit 13, via the system bus (control signal / data) Bus. [H. H.264 HD] encoder 14 and IP socket 14a, [H. H.264 SD] encoder 15 and IP socket 15a, [MPEG2] encoder 16 and IP socket 16a, [JPEG] encoder 17 and IP socket 17a, recording medium writing unit 18, communication interface 19, and camera control unit CC are functional or Electrically connected.

  The video receiver 13 includes three video input terminals <HD / SD-SDI> <NTSC> <HDMI (registered trademark) (High Definition Multimedia Interface)>, and video in HD-SDI (or SD-SDI) format. The video output of the monitoring camera 20A that outputs data is connected to the <HD / SD-SDI> terminal, and the video outputs of the monitoring cameras 20B and 20C that output NTSC video data are connected to the <NTSC> terminal. Further, a personal computer PC or the like is connected to the <HDMI> terminal as necessary, and high-definition video / audio data is input.

  The four types of encoding schemes [H. H.264 HD] [H. Each of the H.264 SD] [MPEG2] [JPEG] encoders 14 to 17 includes a hard encoder configured by an electronic circuit. The video data encoded (compressed) by the encoders 14 to 17 is output to the corresponding IP sockets 14a to 17a. In the IP sockets 14a to 17a, the type of encoding method and the data transmission destination The IP address is packetized as a data string described in the header and transmitted to the wide area network NW via the communication interface 19.

  Here, the video data received by the video receiver 13 is simultaneously encoded by any of the four types of encoding methods for transmission to the monitor side. Is set by the video transmission encoding method setting unit 12a.

  In order to record and store the video data received by the video receiving unit 13 in a recording medium RM that can be carried by the recording medium writing unit 18, any two of the four types of encoding methods are used. The setting as to whether or not to perform simultaneous encoding according to the type of encoding method is performed by the video recording encoding method setting unit 12b.

  FIG. 3 is a diagram showing a combination pattern of three types of three-system simultaneous encoding systems that can be selectively set according to the video data input system by the video transmission encoding system setting unit 12a of the encoder device 10. .

  When the input method of video data received by the video receiver 13 from the monitoring camera 20 is HD-SDI, [H. H.264 HD] [H. H.264 SD] [JPEG] or [H. It is possible to set a combination pattern (transmission mode 1 or transmission mode 2) of three simultaneous coding schemes of H.264 HD] [MPEG2] [JPEG]. When the video data input method is SD-SDI or NTSC, [H. It is possible to set a combination pattern (transmission mode 3) of the three simultaneous encoding schemes of H.264 SD] [MPEG2] [JPEG].

  Therefore, when the video data input method is HD-SDI (monitoring camera 20A), the decoding method of the video data of each decoder device 30A, 30B, PC on the monitor side is [H. In the case of the encoder apparatus 10A of H.264 SD] [MPEG2] [JPEG], the video transmission encoding method setting unit 12a has three methods (transmission mode 2: [H.264 HD] [MPEG2] [JPEG]). Select and set the simultaneous encoding method.

  As a result, the CPU 11 of the encoder apparatus 10A follows the three simultaneous encoding schemes (transmission mode 2: [H.264 HD] [MPEG2] [JPEG]) set in the video transmission encoding scheme setting section 12a. , The video data (SD-SDI) from the monitoring camera 20A received by the video receiver 13 is stored in the [H. H.264 HD] encoder 14, [MPEG2] encoder 16 and [JPEG] encoder 17 are input in parallel, and are encoded (compressed) in an encoding method compatible with any decoder device 30A, 30B, or PC. Video data can be transmitted.

  Further, in the case of the encoder devices 10B and 10C in which the video data input method is NTSC (surveillance cameras 20B and 20C), the video transmission encoding method setting unit 12a (transmission mode 3: [H.264 SD]). [MPEG2] [JPEG]) is selected and set.

  Thereby, the CPU 11 of the encoder apparatuses 10B and 10C performs the three-system simultaneous encoding (transmission mode 3: [H.264 SD] [MPEG2] [JPEG]) set in the video transmission encoding system setting unit 12a. According to the method, the video data (NTSC) from the monitoring cameras 20B and 20C received by the video receiving unit 13 is converted into the [H. H.264 SD] encoder 15, [MPEG2] encoder 16, and [JPEG] encoder 17 are input in parallel, and are encoded (compressed) in an encoding method compatible with any decoder device 30A, 30B, or PC. Video data can be transmitted.

  Each decoder device 30A [H. H.264 SD], 30B [MPEG2], and PC [JPEG], the surveillance cameras 20A, 20B, encoded (compressed) by the encoders 10A, 10B, and 10C using the three-system simultaneous encoding method and transmitted. The video data of the monitoring video 1, 2 and 3 by 20C is selected and received only if the type of encoding method described in the received packet corresponds to the decoding method of the own device.

  As a result, each decoder device 30A [H. In any of H.264 SD], 30B [MPEG2], and PC [JPEG], the video data of the monitoring videos 1, 2, and 3 captured by the monitoring cameras 10A, 10B, and 10C are decoded by the decoding method of the own device. Can be displayed on the corresponding monitors 40A, 40B and PC.

  FIG. 4 is a diagram showing a combination pattern of three types of two-system simultaneous encoding systems that can be selectively set according to the video data input system by the video recording encoding system setting unit 12b of the encoder device 10. .

  When the input method of video data received by the video receiver 13 from the monitoring camera 20 is HD-SDI, [H. H.264 HD] [H. H.264 SD] or [H. It is possible to set a combination pattern (recording mode 1 or recording mode 2) of two types of simultaneous encoding schemes of H.264 HD] [MPEG2]. When the video data input method is SD-SDI or NTSC, [H. It is possible to set a combination pattern (recording mode 3) of two simultaneous encoding schemes of H.264 SD] [MPEG2].

  Therefore, when the video data input method is HD-SDI (monitoring camera 20A), the decoding method of the decoder device for displaying the video data of the monitoring video 1 recorded on the recording medium RM is [H. In the case of the encoder apparatus 10A of H.264 SD] or [MPEG2], the two-system simultaneous encoding scheme (recording mode 2: [H.264 HD] [MPEG2]) is set in the video recording encoding scheme setting unit 12b. Select and set.

  As a result, the CPU 11 of the encoder apparatus 10A follows the two-system simultaneous encoding system (recording mode 2: [H.264 HD] [MPEG2]) set in the video recording encoding system setting unit 12b. H. The video data (packets) of the monitoring video 1 encoded (compressed) by the H.264 HD] encoder 14 and the [MPEG2] encoder 16 are extracted from the communication interface 19 and transferred to the recording medium writing unit 18 to thereby generate [H . H.264 SD] and [MPEG2], the video data of the surveillance video 1 encoded (compressed) by an encoding method compatible with any decoder device can be recorded and stored in the recording medium RM.

  Further, when the video data input method is NTSC (monitoring cameras 20A and 20B), the decoding method of the decoder device for displaying the video data of the monitoring videos 2 and 3 recorded on the recording medium RM is [ H. In the case of the encoder devices 10B and 10C of H.264 SD] or [MPEG2], the two-system simultaneous encoding of (recording mode 3: [H.264 SD] [MPEG2]) is performed in the video recording encoding system setting unit 12b. Select and set the method.

  As a result, the CPU 11 of the encoder devices 10B and 10C follows the two-system simultaneous encoding method (recording mode 3: [H.264 SD] [MPEG2]) set in the video recording encoding method setting unit 12b. [H. H.264 SD] encoder 15 and [MPEG2] encoder 16 encoded (compressed) video data (packets) of monitoring videos 2 and 3 are extracted from communication interface 19 and transferred to recording medium writing unit 18. [H. H.264 SD] and [MPEG2] can be recorded and stored in the recording medium RM for the video data of the monitoring videos 2 and 3 encoded (compressed) by an encoding method compatible with any decoder device.

  It should be noted that the selection of transmission modes 1, 2, and 3 for the video transmission encoding method setting unit 12a and the recording modes 1, 2, and 3 for the video recording encoding method setting unit 12b of the encoder devices 10A, 10B, and 10C. For example, the selection setting is performed by designating and accessing the IP address of each of the encoder devices 10A, 10B, and 10C via the wide area network NW from the personal computer PC installed in the monitoring facility.

  The camera control unit CC performs remote control such as shooting direction control of the corresponding monitoring cameras 20A, 20B, and 20C in accordance with, for example, access from a personal computer PC installed in a monitoring facility.

  Therefore, according to the encoder apparatus 10 having the above configuration, [H. H.264 HD] encoder 14, [H. H.264 SD] encoder 15, [MPEG2] encoder 16, and [JPEG] encoder 17, and the video data input method used in the video transmission encoding method setting unit 12 a is (HD-SDI). (Transmission mode 1: [H.264 HD] [H.264 SD] [JPEG]) or (Transmission mode 2: [H.264 HD] [MPEG2] [JPEG]) Select and set the method, and if the video data input method is (SD-SDI or NTSC), select the three simultaneous encoding methods (Transmission mode 3: [H.264 SD] [MPEG2] [JPEG]) Set [H. H.264 HD / SD], [MPEG2], and [JPEG] video data encoded (compressed) at the same time are transmitted to the decoder devices 30A, 30B, and 30C of each monitor.

  Thereby, in the video surveillance system or the like, the data decoding method of the decoder devices 30A, 30B, 30C of each monitor is set to [H. The present invention provides an existing encoder device 10 with high affinity that can be easily constructed without being affected by the different data decoding schemes even if they are different in H.264 SD], [MPEG2], and [JPEG]. it can.

  Further, according to the encoder apparatus 10 having the above-described configuration, when the video recording encoding method setting unit 12b has an input method of video data received from the monitoring camera 20 (HD-SDI) (recording mode). 1: [H.264 HD] [H.264 SD]) or (Recording mode 2: [H.264 HD] [MPEG2]) is selected and set, and the video data input method is ( In the case of SD-SDI or NTSC), the two simultaneous encoding methods (recording mode 3: [H.264 SD] [MPEG2]) are selected and set, and the two types of encoding methods are simultaneously encoded (compressed). The recorded video data is recorded and stored in a recording medium RM such as a memory card.

  Thereby, in the video monitoring system or the like, for example, when the wide area network NW is cut off, the data decoding method of the decoder device for displaying the video data stored in the recording medium RM is [H. H.264 SD] and [MPEG2] can easily reproduce and display the video data of the monitoring video recorded before and after the network NW is cut off without being affected by the different data decoding methods. be able to.

  In the encoder device 10 of the above-described embodiment, the medium for recording the video data of the monitoring video by setting one of the recording modes 1, 2, and 3 is not limited to the recording medium RM such as a memory card, but the HDD ( Hard disc drive) or SDS (software defined storage) may be used.

  In the embodiment, the type of encoding (decoding) method is [H. In the above, the case where H.264 HD / SD] [MPEG2] [JPEG] is present has been described.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention when it is practiced. Further, each of the embodiments includes inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in each embodiment or some constituent elements are combined in different forms, the problems described in the column of the problem to be solved by the invention If the effects described in the column “Effects of the Invention” can be obtained, a configuration in which these constituent requirements are deleted or combined can be extracted as an invention.

10 (10A to 10C): encoder device, 11: CPU (control unit),
12... Program memory, 12 a.
12b ... Coding method setting unit for video recording, 13 ... Video receiving unit,
14 [H. H.264 HD], 15 ... [H. H.264 SD] encoder,
16 ... [MPEG2] encoder, 17 ... [JPEG] encoder,
14a to 17a ... IP socket, 18 ... recording medium writing unit, RM ... recording medium,
19: Communication interface, CC: Camera control unit,
20 (20A-20C) ... surveillance camera, 30A, 30B ... decoder device,
40A, 40B ... monitor, PC ... personal computer (decoder device / monitor),
NW ... Wide area network.

Claims (10)

A plurality of video encoding means for encoding the video data with different types of encoding methods for the input video data;
A transmission encoding scheme setting means for setting a combination of any of a plurality of types of encoding schemes among the different types of encoding schemes by the plurality of video encoding sections as a transmission encoding scheme;
Encoding output control means for encoding and outputting the input video data by a plurality of video encoding means corresponding to a combination of a plurality of types of encoding systems set by the transmission encoding system setting means;
An encoder device comprising: The video data encoding method is one of the HD-SDI method, the SD-SDI method, and the NTSC method. H.264 HD and H.264 H.264SD system, MPEG2 system and JPEG system,
The transmission encoding scheme setting means is the H.264 standard. H.264 HD and H.264 The encoder apparatus according to claim 1, wherein a combination of any of the three encoding methods of the H.264 SD method, the MPEG2 method, and the JPEG method is set as a transmission encoding method. Video recording means for recording video data;
A recording encoding method setting means for setting a combination of any of a plurality of types of encoding methods among the different types of encoding methods by the plurality of video encoding means as a recording encoding method;
Coding for encoding the input video data by a plurality of video encoding units corresponding to combinations of a plurality of types of encoding schemes set by the recording encoding scheme setting unit and recording the encoded video data by the video recording unit Recording control means;
The encoder device according to claim 1 or 2, further comprising:   The recording encoding method setting means is the H.264 recording medium. H.264 HD and H.264 The encoder apparatus according to claim 3, wherein a combination of any two of the H.264SD system, the MPEG2 system, and the JPEG system is set as a recording encoding system.   5. The video data input according to claim 1, wherein video data of a monitoring video taken by a monitoring camera of a video monitoring system is input as video data to be encoded. 6. Encoder device. An encoding method of an encoder device for encoding input video data by a predetermined encoding method,
For the input video data, set a combination of any one of a plurality of different encoding methods as a transmission encoding method,
Encoding and outputting the input video data with a plurality of encoding schemes corresponding to a combination of the set types of encoding schemes;
Encoding method. The video data encoding method is one of the HD-SDI method, the SD-SDI method, and the NTSC method. H.264 HD and H.264 H.264SD system, MPEG2 system and JPEG system,
The transmission encoding scheme is set according to the H.264 standard. H.264 HD and H.264 The encoding method according to claim 6, wherein a combination of any of the three encoding methods of the H.264 SD method, the MPEG2 method, and the JPEG method is set as a transmission encoding method. The encoder device includes video recording means for recording video data,
A combination of any of a plurality of different encoding schemes among the different types of encoding schemes is set as a recording encoding scheme,
Encoding the input video data with a plurality of encoding schemes corresponding to a combination of a plurality of types of encoding schemes set as the recording encoding scheme, and causing the video recording means to record the encoded video data;
The encoding method according to claim 6 or 7, wherein the encoding method is performed.   The recording encoding method is set in the H.264 standard. H.264 HD and H.264 The encoding method according to claim 8, wherein a combination of any two encoding methods of the H.264 SD method and the MPEG2 method is set as a recording encoding method.   10. The video data input according to claim 6, wherein the video data is input as video data to be encoded as video data of a monitoring video taken by a surveillance camera of a video surveillance system. 11. Encoding method.