JP2008311945A - Playback control system, playback control device and playback control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely realize time keeping function through a network. <P>SOLUTION: The playback control system is equipped with a server terminal 100, having a storage unit 103 and receiving AV (audio visual) data, and a client terminal 200 connected to a server terminal 100 through a communication circuit 10. The client terminal 200 issues recording commands (S1, S3, S4) to the server terminal 100 to record AV data, same as the AV data being displayed, in a storage unit 103 if a pause command is received from an input unit 207 when the client terminal 200 is displaying the AV data inputted from a tuner 201 while the control unit 204 and a decoding unit 203 pauses the operation (S7) when receiving recording start responses (S2, S6) from the server terminal 100 showing that the recording of AV data in response to the recording command is started. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a playback control system, a playback control device, and the like that control recording of AV data programs and playback of AV content via a network.

  In recent years, transmission and reception of AV contents such as video and audio data via a network has been actively performed. If a home LAN is constructed, for example, AV content stored in a personal computer or hard disk (hereinafter referred to as HDD) recorder can be copied to a personal computer or HDD recorder in another room or moved (moving AV content). Become. Also, if AV content streaming delivery is performed via a network, it is possible to play back AV content or perform trick play or other operations even on a television or DVD player that does not have a recording medium. . In the following description, a device that stores and transmits AV content is called a server terminal, and a device that receives and plays back content is called a client terminal.

  If a network is used, a device serving as a client terminal can behave as if it is holding a recording medium even when the device does not have a recording medium. In other words, if the AV content stored in the HDD of the server terminal is to be played back, is the AV content recorded in the HDD stored by the device itself played back by streaming playback from the server? As described above, the AV content of the server terminal can be reproduced.

  When a broadcast program is desired to be recorded, information (recording date and time, channel, etc.) necessary for recording is set on the client terminal side, and the set information is notified to the server terminal via the network. By recording the program based on the information notified on the server side, the user of the client terminal can record the program to be recorded.

  As described above, if the network is used, the client terminal can have a function equivalent to that without having a recording medium. Therefore, there is an advantage that a function merit can be obtained without increasing the cost.

  On the other hand, a time keeping function is known as one of functions that use a random access recording medium such as an HDD in a single TV or HDD recorder.

  The time keeping function means that when a user performs a pause operation while watching a broadcast program, the program screen is paused in accordance with the operation, and at the same time, the program recording to the HDD is started. It is. Thereafter, when the user performs an operation of canceling the pause while the screen is stationary, the program starts to be reproduced from the time when recording is started (that is, when the screen is stationary). By switching the viewing target from the real-time broadcast to the content reproduced from the HDD, the user can view the broadcast program being viewed without leaking the content.

The purpose of the time keeping function is to allow the user to resume watching the program from where it was interrupted even when the user temporarily stopped watching the broadcast, for example, by leaving the television. Several techniques related to the time keeping function have been proposed (for example, Patent Document 1 and Patent Document 2).
JP 2004-172814 A JP 2005-176219 A

  However, if the time keeping function is to be realized in a system composed of the above-described network-connected server terminal-client terminal, the following problems arise.

  FIG. 9 is a diagram illustrating an example of an operation for executing the time keeping function by an operation on the client terminal side on the network. In FIG. 9, a server terminal 910 and a client terminal 920 are connected to the same LAN. Since the server terminal 910 has a recording medium such as an HDD, while the client terminal 920 does not have a recording medium, recording of AV content during time keeping is performed on the recording medium of the server terminal 910.

  First, when a pause operation is performed by the user at the client terminal 920, the client terminal 920 needs to execute stillness of the display screen and start of program recording.

  The client terminal 920 performs the display screen stillness by its own operation, but the program recording needs to be executed by a command to the server terminal 910. Here, as an example, a configuration in which a clock serving as a reference time for operation is shared between the server terminal 910 and the client terminal 920 is used. According to such a configuration, by synchronizing operations between the server terminal 910 and the client terminal 920, it is possible to simultaneously perform stillness of the display screen on the client terminal 920 and start of program recording on the server terminal.

  The client terminal 920 notifies the server terminal 910 of the scheduled time t1 at which the screen is frozen, and the server terminal 910 notifies the client terminal 920 of the time t2 at which recording is started. Basically, t2 ≧ t1, and it is desirable that t2 be set at the same time as t1 as much as possible.

  The server terminal 910 starts recording at the time t1 designated from the client terminal 920 or the time t2 designated from the client terminal 920. The client terminal 920 designates from the time t1 designated from the server terminal 910 or designated from the server terminal 910. The screen is stopped at the time t2. If t1 = t2, it is possible to simultaneously start recording at the server terminal 910 and to freeze the screen at the client terminal 920.

  However, in practice, when the above method is performed, the recording start timing at the server and the screen still timing at the client do not necessarily coincide ideally depending on the network state and the operation state of each terminal. As a specific example, when a network packet delay occurs and the client terminal 920 receives a recording start time notification after the time t2, the server terminal 910 records the time t1 when the client terminal 920 freezes the screen. Does not coincide with the time t2 at which the operation starts.

  In this case, recording of the server terminal 910 becomes impossible. This means that the time keeping function is not accurately realized.

  The present invention has been made in view of the problems of the conventional system described above, and provides a playback control system, a playback control device, a playback control method, and the like that can accurately realize a time keeping function via a network. The purpose is to do.

In order to achieve the above object, a first aspect of the present invention includes a server device having a storage unit and capable of receiving AV data,
A reproduction control system comprising a reproduction control device connected to the server device via a network,
The server device
A command receiving unit for receiving a command from the playback control device;
A response issuing unit that issues a response according to a command from the reproduction control device;
The playback control device
An input unit capable of inputting at least AV data;
A command receiving unit that receives commands from the user;
A command issuing unit that issues a command to the server device in response to a command from the command receiving unit;
A response receiving unit that receives the response from the server device;
A display unit for displaying AV data input from the input unit;
A display control unit that performs control to temporarily stop display output from the display unit,
The playback control device
When the command accepting unit accepts the display pause command while the display unit displays the AV data input from the input unit, the command issuing unit displays the display to the server device. Issuing a recording command for recording the same AV data as the AV data in the storage unit;
The server device
When the command receiving unit receives the recording command, the playback control device receives the same AV data as the AV data being displayed and records it as AV content in the storage unit, and the response issuing unit Issuing a recording start response to the effect that the recording of the AV data according to the command is started, to the reproduction control device;
The playback control device
When the response reception unit receives the recording start response, the display control unit executes the pause operation.

The second aspect of the present invention is connected via a network to a server device capable of receiving AV data, having a storage unit, a command receiving unit for receiving commands, and a response issuing unit for issuing responses in response to the commands. A playback control device,
An input unit capable of inputting at least AV data;
A command receiving unit that receives commands from the user;
A command issuing unit that issues a command to the server device in response to a command from the command receiving unit;
A response receiving unit that receives the response from the server device;
A display unit for displaying AV data input from the input unit;
A display control unit that performs control to temporarily stop display output from the display unit,
The command issuing unit displays a display to the server device when the command receiving unit receives a display pause command while the display unit displays the AV data input from the input unit. Issuing a recording command for recording the same AV data as the AV data in the storage unit as AV content;
The response receiving unit receives the same AV data as the AV data being displayed by the reproduction control device in response to the command receiving unit of the server device receiving the recording command, and records it in the storage unit When a recording start response is received indicating that
The display control unit is a playback control device that executes the pause operation.

According to a third aspect of the present invention, the command issuing unit receives the AV content recorded by the storage unit with respect to the server device when the command receiving unit receives an instruction to cancel the suspension control by the user. Issue a playback start request for
When all or part of the AV content reproduced from the storage unit in response to the reproduction start request is input from the server device to the input unit, the display control unit cancels the suspension control. In the playback control device according to the second aspect of the present invention, the display on the display unit is switched from the paused AV data to the AV content input from the server device. is there.

  According to a fourth aspect of the present invention, the AV content is continuously displayed on the display unit from the corresponding stop position corresponding to the pause position of the AV data paused by the pause control. The reproduction control apparatus according to the second aspect of the present invention.

Further, the fifth aspect of the present invention is a pause position information detection unit for detecting pause position information relating to a pause position of the AV data paused by the pause control;
A pause position information storage unit for storing the pause position information;
A corresponding stop position detecting unit that detects the corresponding stop position in the AV content reproduced by the server device using the temporary stop position information;
The reproduction start request is a request to reproduce the AV content recorded in the storage unit by the server device in accordance with the recording command from the corresponding stop position detected by the corresponding stop position detection unit. It is the reproduction | regeneration control apparatus of this invention.

In the sixth aspect of the present invention, the command issuing unit issues a pre-play command for playing the AV content recorded by the storage unit in advance to the server device,
When the corresponding stop position detection unit receives an input of the AV content reproduced from the server device in response to the preliminary reproduction command, the corresponding stop position detection unit uses the temporary stop position information to respond to the server in accordance with the preliminary reproduction command. It is the reproduction | regeneration control apparatus of 5th this invention which detects the said corresponding stop position in the said AV content which an apparatus reproduces | regenerates.

  The seventh aspect of the present invention is the regeneration control device according to the sixth aspect of the present invention, wherein the command issuing unit issues the prior regeneration command until at least the command receiving unit receives the release command. .

  An eighth aspect of the present invention is the regeneration control device according to the sixth aspect of the present invention, wherein the command issuing unit issues the preliminary regeneration command after the command receiving unit receives the release command.

Further, a ninth aspect of the present invention is a pause position information detection unit for detecting pause position information relating to a pause position of the AV data paused by the pause control;
A pause position information storage unit for storing the pause position information;
A corresponding stop position detecting unit that detects the corresponding stop position in the AV content reproduced by the server device using the temporary stop position information;
The playback start request is a request to play back the AV content recorded by the server device according to the recording command from the start of recording,
The display control unit is the playback control device according to the fourth aspect of the present invention, which outputs the AV content to the display unit from the corresponding stop position detected by the corresponding stop position detection unit.

  The tenth aspect of the present invention is the playback control device according to the fourth aspect of the present invention, wherein the corresponding stop position is described by information for the server device to manage the AV content.

  An eleventh aspect of the present invention is the reproduction control apparatus according to the fourth aspect of the present invention, wherein the corresponding stop position is described by information for the server device to process the AV data.

Also, in the twelfth aspect of the present invention, the AV data includes time information embedded at specific time intervals,
The temporary stop position information is the reproduction control device according to the fifth or ninth aspect of the present invention, which is the time information.

In the thirteenth aspect of the present invention, the AV data is in an MPEG2-TS format with a time stamp,
In the twelfth aspect of the present invention, the time information is a time stamp.

In the fourteenth aspect of the invention, the AV data is in MPEG2-TS format,
In the twelfth aspect of the present invention, the time information is PTS (Packetized Time-Stamp).

  The fifteenth aspect of the present invention is the reproduction control apparatus according to the second aspect of the present invention, wherein a communication protocol used in the network is HTTP (Hyper Text Transfer Protocol).

  The sixteenth aspect of the present invention is the playback control apparatus according to the second aspect of the present invention, wherein the communication protocol used in the network is UPnP (Universal Plug and Play).

According to a seventeenth aspect of the present invention, there is provided a server apparatus having a storage unit and capable of receiving AV data;
A reproduction control method using the server apparatus and a reproduction control apparatus connected via a network,
The server device
A command receiving step for receiving a command from the reproduction control device;
Executing a response issuing step of issuing a response in accordance with a command from the reproduction control device;
The playback control device
An input process for inputting at least AV data;
A command receiving process for receiving commands from the user;
In response to a command by the command receiving step, a command issuing step for issuing a command to the server device;
A response accepting step for accepting the response from the server device;
A display step of displaying the AV data input from the input step;
And at least a display control step for performing control to temporarily stop display output by the display step,
When displaying the AV data input by the input step by the display step of the reproduction control device, if a command to pause the display is received by the command receiving step, To the server device, issue a recording command for recording the same AV data as the AV data being displayed in the storage unit;
The server device
When the recording command is received by the command receiving step, the playback control device receives the same AV data as the AV data being displayed and records it as AV content in the storage unit,
As the response issuing step, a recording start response to the effect that recording of the AV data according to the recording command is started is issued to the reproduction control device,
The playback control device
When the recording start response is received by the response receiving step, the pause control operation is executed as the display control step.

  According to an eighteenth aspect of the present invention, the command issuing unit that issues a command to the server device in response to a command from the command receiving unit of the reproduction control device according to the second aspect of the present invention, and at least the display unit Is a program for causing a computer to function as a display control unit that performs control for temporarily stopping display output.

  The nineteenth aspect of the present invention is a recording medium that records the program of the eighteenth aspect of the present invention, and is a recording medium that can be processed by a computer.

  According to the present invention as described above, it is possible to accurately realize a time keeping function via a network.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(Embodiment 1)
A configuration diagram of a network including a reproduction control apparatus, which constitutes the reproduction control system according to Embodiment 1 of the present invention, will be described with reference to FIG.

  FIG. 1 is a diagram illustrating a connection example of a server terminal and a client terminal as the reproduction control system according to the first embodiment. A server terminal 100 and a client terminal 200 are connected to each other via a communication line 10 in a home LAN via an Ethernet (registered trademark) cable. TCP / IP is used as the communication protocol of the communication line 10.

  Server terminal 100 is implemented as an STB (set top box), HDD recorder, or the like having a function of receiving and demodulating a broadcast from a broadcasting station. The configuration will be described below with reference to FIG.

  In the server terminal 100, the tuner unit 101 is a unit that selects and receives broadcasts from broadcasting stations such as CATV and BS digital broadcasts, and the demodulation unit 102 is a unit that demodulates broadcast signals into MPEG2-TS. The storage unit 103 is a unit for recording the MPEG2-TS input from the demodulation unit 102, and the control unit 104 is a unit for controlling operations of the tuner unit 101, the demodulation unit 102, and the storage unit 103, which will be described later. It is possible to operate according to a command from the receiving unit 106.

  The transmission unit 105 is a means for transmitting AV content and other data to the client terminal 200 via the communication line 10, and the reception unit 106 receives commands from the client terminal 200 via the communication line 10. Means for receiving data.

  In the server terminal 100 having the above configuration, the MPEG2-TS obtained from the demodulation unit 102 can be recorded in the storage unit 103 and stored as AV content. The storage unit 103 is realized as a recording device having a recording medium such as an HDD or a DVD.

  In addition, the server terminal 100 includes the transmission unit 105 and the reception unit 106, and thus has a function of performing packet communication with the client terminal 200 via the home LAN.

  For example, when the reception unit 106 receives a recording execution request from the client terminal 200, the control unit 104 selects the channel selected by the tuner unit 101, starts recording the received broadcast, and records it as AV content in the storage unit 103. When the receiving unit 106 receives an AV content acquisition request from the client terminal 200, the AV content recorded in the storage unit 103 is transmitted by the transmitting unit 105 via the communication line 10.

  Next, the client terminal 200 is realized as a television, STB or the like having a function of receiving and demodulating a broadcast from a broadcasting station. Hereinafter, the configuration of the client terminal 200 will be described with reference to FIG.

  In the client terminal 200, the tuner unit 201 is a unit that selects and receives broadcasts from broadcasting stations such as CATV and BS digital broadcasts, and the demodulation unit 202 is a unit that demodulates broadcast signals into MPEG2-TS. The decoding unit 203 is a unit that decodes the MPEG2-TS input from the demodulation unit 202 into a video signal, and the output unit 208 is a unit that displays the video signal obtained from the decoding unit 203. The control unit 204 is a unit that controls the operations of the tuner unit 201, the demodulation unit 202, the decoding unit 203, and the output unit 208, and can operate according to a command from the input unit 207, which will be described later.

  The transmission unit 205 is a means for transmitting commands and other data from the control unit 204 to the server terminal 200 via the communication line 10, and the reception unit 206 is a server terminal via the communication line 10. It is a means for receiving AV content and other data from 100.

  In the client terminal 200 having the above configuration, similarly to the server terminal 100, the transmission unit 205 and the reception unit 206 can perform packet communication with the server terminal 100 via the home LAN.

  For example, the transmission unit 205 requests the server terminal 100 to record a program by transmitting a recording execution request to the server terminal 100, or transmits an AV content acquisition request to the server terminal 100. It is possible to receive and view the stored AV content.

  Input from the user operating the client terminal 200 is received by the input unit 207 and input to the control unit 204 as a control command. The form of the input unit 207 includes an input interface such as a remote control key, but the light receiving unit of the remote controller may be realized as a means for receiving a signal input from the remote controller based on a user operation. In the following description, the output unit 208 is a display, and the client terminal 200 is a device (for example, a TV) having a function of displaying AV content by itself.

  In each of the above configurations, the client terminal 200 corresponds to the reproduction control device of the present invention, and the server terminal 100 corresponds to the server device of the present invention. The communication line 10 corresponds to the network of the present invention.

  In the client terminal 200, the input unit 207 corresponds to the command receiving unit and the input unit of the present invention, the control unit 204 and the transmission unit 206 correspond to the command issuing unit of the present invention, and the control unit 204 reception unit 206 is the main unit. The control unit 204 and the decoding unit 203 correspond to the display control unit of the present invention. The output unit 208 corresponds to the display unit of the present invention.

  In the server terminal 100, the storage unit 103 corresponds to the storage unit of the present invention, the control unit 104 and the reception unit 106 correspond to the command reception unit of the present invention, and the control unit 104 and the transmission unit 105 correspond to the response of the present invention. Corresponds to the issuing department.

  The operation of the reproduction control system and the reproduction control device of the first embodiment of the present invention as described above will be described, and an embodiment of the reproduction control method of the present invention will be described.

  FIG. 4 is a diagram showing an operation sequence at the time of suspension in execution of the time keeping function in the network of the first embodiment shown in FIG.

  In FIG. 4, as an initial state, the client terminal 200 receives a broadcast program using the tuner unit 201 and the demodulation unit 202 incorporated therein and displays the broadcast program on the output unit 208. It is assumed that the broadcast program displayed on the unit 208 is being viewed. On the other hand, it is assumed that the server terminal 100 is in a state where the main power supply is in an ON state but a specific operation is not performed.

  First, when an input for a pause operation of a broadcast program being watched by the user is made to the input unit 207 as a pause command, a signal corresponding to the pause command is transmitted from the input unit 207 to the control unit 204. It is done.

  Upon receiving this signal, the control unit 204 generates a recording start request for causing the server terminal 100 to execute a recording operation, and transmits the request to the server terminal 100 via the transmission unit 205 (S1).

  The recording start request can be realized as an action request for CreateRecordSchedule in SRS (Scheduled Recording Service) if UPnP (Universal Plug and Play) is used as a protocol. As a result, it is possible to set reservation recording for the server terminal 100.

  At this time, parameters necessary for the server terminal 100 to execute recording (hereinafter referred to as recording parameters) must be notified simultaneously with the recording start request.

  Typical examples of the contents of the recording parameters include a recording start time, a recording end time, a recording tuner, a channel number indicating a channel selection destination, and the like.

  In this case, the recording start request issued from the client terminal 200 is a request corresponding to the pause command on the client terminal 200 side in order to realize the time keeping function, so that the server terminal 110 immediately receives the recording start request. It is necessary to start recording. Therefore, the recording start time is designated as the current time or designated as immediate recording (or as a recording parameter that does not include information regarding the time), and the server terminal 100 starts recording as soon as possible. Is desirable.

  The channel number indicating the channel selection destination is set to the same channel number that is currently set in the tuner unit 201 of the client terminal 200.

  If the program to be recorded can be specified in advance, it is not necessary to notify all the contents of the recording parameters. For example, if EPG (Electronic Program Guide) information can be acquired in advance in both the server terminal 100 and the client terminal 200, it is only necessary to notify only an ID that can uniquely identify a program.

  The recording start request and the recording parameters correspond to the recording command of the present invention.

  In the server terminal 100, when the receiving unit 106 receives the recording start request and the recording parameters, the recording start request is input to the control unit 104 as an operation execution command. When acquiring the recording start request, the control unit 104 executes the recording operation according to the following procedure according to the simultaneously acquired recording parameters. That is, the tuner unit 101 is operated to select the same broadcasting station that the client terminal 200 is receiving, and the demodulating unit 202 demodulates the broadcast signal. The MPEG2-TS obtained by demodulation is recorded in the storage unit 103 as AV content.

  The storage unit 103, when recording MPEG2-TS, assigns a URI (Uniform Resource Identifier) that is an identifier for uniquely specifying the storage location, and manages it as AV content. When UPnP is used as a network communication protocol, the URI of the AV content is disclosed to each terminal on the network via the UPnP communication protocol. The client terminal 200 and other terminals connected to the network can specify the storage location of the content by acquiring the URI using the UPnP communication protocol. As a result, the client terminal 200 and other terminals connected to the network can access the AV content in the storage unit 103.

  Upon confirming that the above procedure has been started, the control unit 104 transmits the first half of the recording start response to the client terminal 200 via the transmission unit 105 (S2). If UPnP is used as a protocol, the action response of SRS CreateRecordSchedule can be used as the first half of the recording start response. In the client terminal 200, when the receiving unit 206 receives this action response, the control unit 204 can know that the server terminal 100 is performing an operation related to the start of AV content recording.

  At this time, the content of the action response of CreateRecordSchedule is generally a notification that the setting of recording reservation has been completed, that is, that the preparation of the recording operation has been completed, and notification that the server terminal 100 has actually started recording. Not what you want.

  That is, on the client terminal 200 side, the control unit 204 cannot immediately determine that the server terminal 110 has actually started recording upon receipt of the CreateRecordSchedule action response.

  Therefore, in the client terminal 200, when the action response of S2 is received, the control unit 204 polls the server terminal 100 via the transmission unit 205 (S3, S4).

  When the server terminal 100 receives a polling inquiry, the control unit 104 checks whether the tuner unit 101, the demodulation unit 202, and the storage unit 103 are operating in accordance with a procedure in accordance with the recording start request.

  When the recording is actually started and the operation confirmation is completed (S5), the control unit 104 transmits the latter half of the recording start response to the client terminal 200 via the transmission unit 105 (S6). If UPnP is used as a protocol, an action request of SRS BrowseRecordSchedule can be used as a polling inquiry, and an action response of BrowseRecordSchedule can be used as a response to start recording.

  In the client terminal 200, when the receiving unit 206 receives the action response of S6, the control unit 204 can know that the server terminal 100 is actually performing the AV content recording start operation. The client terminal 200 can detect the timing at which the server terminal 100 actually starts recording by periodically polling.

  When the client terminal 200 receives the recording start response (S2 and S6) from the server terminal 100 and confirms that recording of AV content is actually started in the server terminal 100, the control unit 204 outputs the output unit 208. After the video displayed on the screen is stopped, the output of the video signal to the output unit 208 is stopped (S7). At this time, the operations of the tuner unit 201, the demodulation unit 202, and the decoding unit 203 may be controlled to stop together.

  Here, the video is stopped by the frame memory 203 a provided in the decoding unit 203. The frame memory 203a stores image data for one frame from image data obtained by decoding MPEG2-TS, and causes the output unit 208 to display it as a still screen under the control of the control unit 204.

  At this time, the control unit 204 temporarily stores the time information of the still screen at the output unit 208. In the present embodiment, MPEG2-TS is used as a format of broadcasting transmitted from a broadcasting station or AV content transmitted via a network. Since MPEG2-TS is transmitted with a 4-byte time stamp added every 188 bytes, it is used as time information. Therefore, the time information here indicates the absolute position of the AV content.

The control unit 204 has a memory 204a, and stores time information therein. The stored time information is T2. Here, the time information T2 uses the time stamp added immediately before the stationary screen data, but is added immediately after the time stamp added in the middle of the screen data or the screen data. You may use a time stamp.
(Embodiment 2)
Next, as the second embodiment, the operation after releasing the stillness of the image statically displayed on the output unit 208 in the client terminal 200 will be described with reference to FIG.

  In S7 of the first embodiment, a still screen is displayed on the output unit 208, and time information T2 indicating the absolute position of the AV content corresponding to the still screen using a time stamp is stored in the memory 204a of the control unit 204. did.

  Further, the control unit 204 performs control to reproduce the AV content recorded in the storage unit 103 of the server terminal 100 in advance, analyzes the reproduced AV content, and starts the content at the position where the time information matches T2. The byte position from is obtained (hereinafter, this operation is referred to as “prefetching operation”).

  By performing a pre-reading operation before an operation for resuming reproduction is input from the user to the input unit 207, the operation of seamlessly reproducing the AV content recorded on the server terminal 100 from the still screen is quickly performed. Is.

  The specific procedure is described below. Here, the purpose is to obtain the byte position P2 corresponding to the time information T2.

  First, on the client terminal 200 side, the control unit 204 transmits an AV content acquisition request from the transmission unit 205 to the server terminal 100.

  The AV content acquired by the client terminal 200 must be AV content that has been recorded by the previous recording start request and is being recorded in the storage unit 103.

  In the present embodiment, the AV content being recorded by the server terminal 100 is given a URI at the start of recording, but the client terminal 200 stores the AV content in the storage unit 103 of the server terminal 100 at the time of AV content acquisition request transmission. I do not know the URI of the AV content being recorded.

  Therefore, the AV content acquisition request according to the present embodiment includes (1) specification of AV content in the server terminal 100, (2) request for URI of the specified AV content, and (3) AV content corresponding to the acquired URI. Based on the three-stage process of acquisition. The details will be described below.

  In the present embodiment, an SRS BrowseRecordSchedule action request is used for the above (1), and this is transmitted to the server terminal 100 (S8). This is a request for acquiring a CDS (Content Directory Service) object ID of AV content generated by the reservation operation, and is a mechanism for associating the recording reservation with the AV content generated by the recording reservation. is there. As shown in the first embodiment, the server terminal 100 records AV content as a reservation operation, and therefore, by this action response, other AV content in the storage unit 103, target AV content, and Can be identified.

  Upon receiving the BrowseRecordSchedule action request in S8, the control unit 104 of the server terminal 100 transmits the object ID to the client terminal 200 by the transmission unit 105 accordingly (S9).

  On the client terminal 200 side, when the CDS object ID is acquired by the receiving unit 206, the control unit 204 transmits a CDS Browse action request specifying the acquired object ID (S10).

  The action request in S10 is a request for the above (2), and when the control unit 104 of the server terminal 100 obtains a Browse action request for CDS, the URI of the AV content being recorded in the storage unit 103 in response thereto Is transmitted to the client terminal 200 by the transmission unit 105 (S11).

  As a method for acquiring the URI of AV content in UPnP, the BrowseRecordSchedule action request in S8, which is the step (1), is omitted, and the Browse action request in S10, which is the step (2), is used first. You can also.

  However, in this case, it is necessary to specify the CDS object ID of the AV content. That is, when a plurality of AV contents are recorded in the storage unit 103, it is necessary to specify which AV contents in the AV contents are the AV contents generated by the previous reservation recording.

  Therefore, it is desirable to perform the step (1) in advance.

  Finally, for the above (3), the client terminal 200 transmits an HTTP (Hyper Text Transfer Protocol) GET request to the server terminal 100 (S12). The GET request is a request for specifying a target by using a URI (Uniform Resource Identifier) and a Range header, and acquiring the content, and the control unit 204 uses the URI acquired by the CDS Browse action request first. The AV content in the recording operation in the server terminal 100 is designated.

  Furthermore, the Range header is used to specify a range in which the AV content specified by the URI is acquired by a byte position. By specifying the part for which AV content is desired to be acquired by the start header position and end byte position using the Range header, it is possible to specify and acquire only a specific range without acquiring all AV content from the beginning. .

  In the present embodiment, the client terminal 200 transmits an AV content acquisition request from the beginning of the AV content being recorded in order to specify the head position P2 that should be originally designated. Specifically, the client terminal 200 transmits a GET request that is designated as the 0th byte or later in the Range header or does not have a Range header.

  The server terminal 100 that has received the GET request transmits a response to the GET request and the actual data of the AV content to the client terminal 200 (S13).

  When the client terminal 200 receives the AV content in the MPEG2-TS format from the receiving unit 106, the control unit 204 specifies the first byte position P2 of the AV content to be reproduced after releasing the pause. As a method for specifying P2, it is determined whether or not the time information T2 previously stored in the memory 204a in the control unit 204 matches the time information TX included in the AV content transmitted from the server terminal 100. To do. That is, as shown in FIG. 5, in the control unit 204, the comparator 204c checks whether the input AV content has a time stamp having time information TX corresponding to the time information T2 read from the memory 204a. Comparison is made (S14).

  When a matching time stamp is detected, the time stamp indicating the time information TX is converted into the byte position P2 on the AV content by the converter 204d and temporarily stored in the memory 204a. FIG. 5 is a schematic block diagram showing the function of the control unit 204. The memory 204a, the comparator 204c, and the converter 204d operate under the control of the CPU 204b. The CPU 204b corresponds to the temporary stop position information detection unit of the present invention, the memory 204a corresponds to the temporary stop position information storage unit of the present invention, and the CPU 204b, the comparator 204c, and the converter 204d are the corresponding stop position detection of the present invention. It corresponds to the part.

  If the byte position P2 can be specified, it is not necessary to receive AV contents thereafter. Therefore, under the control of the control unit 204, the reception unit 106 and the like are disconnected at that time (S16), etc. The reception of AV content is terminated. If the time information TX is not detected, the AV content reception is continued (S17).

  With the above operation, when the temporary display of the screen is canceled on the client terminal 200, the head portion of the AV content to be displayed on the output unit 208 first is specified as the byte position P2.

  In the above operation, the AV content acquisition requests in S8, S10, and S12 constitute the pre-play command of the present invention.

  Next, an operation sequence at the time of resuming reproduction in the time keeping function in the present embodiment will be described with reference to FIG.

  In the client terminal 200, when the user performs an operation for resuming reproduction on the input unit 207, a command for resuming reproduction is input to the control unit 204. The control unit 204 transmits an AV content acquisition request via the transmission unit 205 (S18). Here, the operation of resuming reproduction by the user corresponds to a release command of the present invention.

  The AV content acquisition request in S18 is composed only of an HTTP GET request, and the content of the GET request specifies the same URI acquired in S11 and is stored in the memory 204a and acquired in S13 to S15. The byte position after the byte position P2 is designated in the Range header.

  When the server terminal 100 receives the AV content acquisition request via the receiving unit 106, the control unit 104 reads the designated AV content from the storage unit 103, and transmits the AV content via the communication line 10 by the transmission unit 105 (S19). ). At this time, the actual data of the AV content transmitted from the transmission unit 105 is a data string after the P2 byte from the top.

  When AV content transmitted from the server terminal 100 is received via the receiving unit 206, the AV content is directly input to the decrypting unit 203. AV content that is MPEG2-TS is decoded into a video signal by the decoding unit 203 and then input to the output unit 208. The output unit 208 switches to the display of the still image stored in the frame memory 203a, and displays and outputs the video signal (S20).

  The video at the time of resuming playback based on the AV content received from the server terminal 100 is a video after the byte position P2, that is, a video after the time T2.

  On the other hand, since the video displayed during the pause is also the video at time T2, when playback is resumed, the video is continuously displayed from the pause position, and a seamless time keeping operation is realized.

  Here, the byte position P2 of the AV content specified by the client terminal 200 through the steps S8 to S15 will be described with reference to FIG. FIG. 7A shows a change in the recording state of the program in the server terminal 100 and a change in the viewing state of the program in the client terminal 200 in time series. The horizontal axis t indicates the change in time.

  The initial state is a state in which the user receives and watches a program broadcast from a broadcast station in real time in the client terminal 200. Since this period is the time being viewed by the user from the standpoint of the program being viewed, this period is indicated as a viewing section.

  Next, it is assumed that the user performs a pause operation at time T 0, that is, a pause command is input to the input unit 207. The operation at this time is as described in (Embodiment 1: S1 to S17). The client terminal 200 transmits a recording start request to the server terminal 100, and the server terminal 100 that has received the request starts the built-in storage unit. In 103, program recording is started. The time when the server terminal 100 actually starts recording is assumed to be T1. Since the recording of the program is executed after time T1, this interval is shown as a recording interval.

  Subsequently, the server terminal 100 transmits a recording start response to the client terminal 200. The client terminal 200 stops the video being viewed after receiving the recording start response. This time is T2.

  Furthermore, in the playback control apparatus according to the present embodiment, when the client terminal 200 plays back AV content from the server terminal 100 when playback is resumed, the playback range of the AV content is set to the time T2 or later after the steps S18 to S20. It is specified to be a thing. That is, the byte position P2 of the AV content corresponding to the time T2 is specified before resuming reproduction, and the AV content is displayed on the output unit 208 from the range after the byte position P2 when resuming reproduction.

  In the above time series, both the time T0 and the time T1 and the time T1 and the time T2 are included in the viewing section. That is, in the operation of each embodiment of the present invention, a period of time (time T2−time T0) occurs from when the user starts the operation of pausing the screen of the output unit 208 until the screen actually stops. However, within this period, the client terminal 200 issues an AV content recording execution command to the server terminal 100 and confirms that the recording operation based on the command has been performed, and then temporarily pauses the video ( (Embodiment 1) In addition, the playback position of AV content at the time of restarting playback is detected (Embodiment 2).

  Incidentally, when the conventional client terminal is used to realize the time keeping function between the server and the client via the network, as shown in FIG. 7B, the time T0 at which the client terminal 200 starts the pause operation. When the server terminal is instructed to start recording at time T1, it is necessary to start recording at time T1 when the screen actually stops at the client terminal. When the server terminal delays the reception due to a delay or the like, the AV content cannot be recorded on the server terminal.

  Also, even if the server terminal can start recording immediately after the delayed instruction arrives in response to such a problem, the reproduced video loses continuity due to the delay in recording start. For example, when recording is started at time T2, which is delayed from time T1, the video at the time of resuming playback transitions from time T1 to time T2, so the video at the time of resuming playback becomes discontinuous.

  In the case of the present embodiment, even if a time lag due to a data packet delay or the like occurring on the network occurs in the operation between the server terminal 100 and the client terminal 200, the period is always included in the viewing section. Therefore, the influence of the time lag does not appear on the display screen that is resumed after the pause.

  As described above, the playback control apparatus according to the present invention provides a server terminal when the time keeping function is realized using the storage unit 103 of the server terminal 100 connected via a network, as shown in the first embodiment. Since the video is stopped after waiting for 100 to start recording, it is possible to prevent occurrence of a time zone that is not recorded on the server terminal 100 and is not viewed on the client terminal 200, and time keeping is maintained. Accurate realization of functions becomes possible.

  Further, as shown in the second embodiment, after the client terminal 200 performs the pause operation, the AV content is acquired from the server terminal 100 in advance before the reproduction operation is resumed, and based on the time stamp embedded in the AV content. Next, the byte position to be specified when resuming playback is specified. When an operation for resuming playback is performed, AV content is acquired from the specified byte position, so that an accurate time keeping function can be executed while suppressing screen skipping and delay.

  Note that the time keeping function according to the present embodiment assumes that the playback is resumed after a certain period of time has elapsed since the user left the place after the pause, as the original purpose is. is doing. Moreover, it is assumed that there are many such cases as general use cases.

  However, in some cases, there is a possibility that resumption of reproduction is executed immediately after the pause. Specifically, for example, in FIG. 4, a case is assumed in which an operation for resuming playback is executed during reception of AV content (before disconnection).

  In such a case, after the byte position P2 is specified and the connection is disconnected, it is not necessary to newly designate the byte position P2 and the subsequent AV contents. That is, reception of AV content is continued as it is, and video output may be started from the point in time when the time information TX such that TX = T2 is detected. In this case, if described with reference to FIG. 7A, the AV content is acquired by designating the 0th byte and after when resuming the reproduction, and therefore a delay of T2-T1 time at the maximum is Will occur.

  However, since the video is output from the portion after time T2, there is no occurrence of screen skipping or a section in which the user cannot be seen. In addition, as described above, since it is generally assumed that a certain time is set after the pause operation, it is considered that such a delay does not frequently occur.

  In the above embodiment, the time information T2 of the AV data and the byte position P2 of the AV content coincide with each other. However, the video displayed on the output unit 208 feels continuity to the user without a sense of incongruity. There may be as much error as possible. That is, there may be a margin between the corresponding stop position and the temporary stop position information.

  In the above description, S8 to S16 are executed immediately after the screen stillness control is performed in S7, and the byte position P2 of the AV content is detected. However, S8 to S16 are The process may be executed after S18 is started after a reproduction start operation is input from the user to the input unit 207 of the client terminal 200.

  In the above description, after the screen stillness control is performed in S7, S8 to S16 are executed to detect the byte position P2 of the AV content, and S18 designates the byte position P2 to specify the server terminal. The AV content is acquired from 100, but as the content of the GET request in S18, the same URI as that acquired in S11 is specified and the 0th byte or later is specified in the Range header, or the Range header You may make it transmit the GET request of nothing.

  In this case, when the server terminal 100 receives an AV content acquisition request via the receiving unit 106, the control unit 104 reads all of the AV content specified from the storage unit 103, and the transmission unit 105 via the communication line 10. To send. At this time, the actual data of the AV content transmitted from the transmission unit 105 is all data strings after the head.

When AV content transmitted from the server terminal 100 is received via the receiving unit 206, the AV content is directly input to the decrypting unit 203. AV content that is MPEG2-TS is decoded into a video signal by the decoding unit 203.
The control unit 204 inputs only the AV content of the data sequence after the byte position P2 to the output unit 208 without discarding or decoding the AV content corresponding to the data sequence before the byte position P2. The output unit 208 switches to the display of the still image stored in the frame memory 203a and displays and outputs the video signal.

  The above-described process of acquiring all AV contents being recorded from the server terminal 100 and displaying only the AV contents of the data string after the byte position P2 on the client terminal 200 side is temporarily stopped by a user's sudden operation. Even when resumption of reproduction is executed immediately after that, there is an advantage that the reproduction state can be immediately restored by a single AV content acquisition request.

In this embodiment, the time stamp of MPEG2-TS with time stamp is used as a method for detecting a screen that matches a still screen. This is embedded at every specific time interval of the present invention. Time information, which corresponds to temporary stop position information.
The method for detecting a matching screen is not limited to this. For example, the temporary stop position information of the present invention may be used for PTS (Packetized Time-Stamp) and other time information included in MPEG2-TS, or an image frame of a still image in a video signal obtained by decoding MPEG2-TS. The screen itself may be used as temporary stop position information, and a matching screen may be detected by comparison.

  In each of the above embodiments, the broadcasts that the server terminal 100 and the client terminal 200 select and receive at the tuner units 101 and 201 correspond to the AV data of the present invention, and the storage unit 103 of the server terminal 100 The AV content recorded in is equivalent to the AV content of the present invention. However, the present invention is not limited to the above embodiment, and AV data may be CATV, terrestrial digital broadcasting, BS, CS digital broadcasting, the Internet, an intranet, and other networks. AV data that can be acquired from the network or the network is included in the AV data of the present invention.

  In the above description, the AV content is a broadcast including moving images and audio, but it may be only audio. In this case, the output unit 208 of the client terminal 200 is realized as a speaker, and “display” in the present invention corresponds to audio output, and “pause” corresponds to a silent state. In the case of a video signal, as described in the first and second embodiments, “pause” means that a still image is displayed. However, the image may not be displayed.

  In the above embodiment, the client terminal 200 has a configuration including the tuner unit 201 and the demodulation unit 202, and realizes a time keeping function for a program that has been selected and received by the client terminal 200 itself. However, as shown in FIG. 8, the tuner unit 201 and the demodulating unit are omitted, and the tuner unit 101 and the demodulating unit 202 of the server terminal 100 are controlled to input MPEG2-TS from the communication line 10. It is good also as what receives. Also in this case, the time keeping function can be realized according to the time chart of FIG. At this time, the control unit 204 and the receiving unit 206 correspond to an input unit that receives AV data input of the present invention.

  In the above embodiment, the client terminal 200 has been described as a device such as a TV incorporating the output unit 208. However, in the playback control apparatus of the present invention, the output unit 208 has other configurations. It is good also as a structure of a separate housing | casing from a part. In this case, a general-purpose display or TV can be used as the output unit 208, and other parts of the other tuner 201 can be realized as STBs. That is, the reproduction control apparatus of the present invention may be implemented as a TV or other image receiving apparatus and a video signal output apparatus such as an STB.

  In the above embodiment, the client terminal 200 has been described as receiving the same broadcast as that received by the server terminal 100 as AV data. However, the AV data of the present invention includes the server device and the client. It need not be received simultaneously with the device. For example, the present invention can be implemented even when a program received by the server terminal 100 and a program received by the client terminal 200 are broadcast with a time difference. Such a configuration is suitable for broadcasting that provides AV data in a video-on-demand manner.

  In the above embodiment, the server terminal 100 and the client terminal 200 perform the operations shown in the steps of FIGS. 4 and 6 according to the HTTP and UPnP protocols. However, this is only an example. The reproduction control device of the present invention is not limited to the type of protocol. Therefore, it may be implemented using a communication protocol such as RTP (Real-time Transfer Protocol), and the same effect can be obtained.

  The program according to the present invention is a program for causing a computer to execute the functions of all or part of the above-described reproduction control apparatus of the present invention, and is a program that operates in cooperation with the computer. Also good.

  The present invention is also a recording medium on which a program for causing a computer to execute all or part of the functions of all or part of the above-described reproduction control apparatus of the present invention is recorded. The read program may be a recording medium that executes the function in cooperation with the computer.

  The “part of means” of the present invention means some of the plurality of means, or means a part of functions of one means.

  The present invention also includes a computer-readable recording medium that records the program of the present invention.

  Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.

  Further, one usage form of the program of the present invention may be an aspect in which the program is transmitted through a transmission medium, read by a computer, and operated in cooperation with the computer.

  Further, the recording medium includes a ROM and the like.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, but may include firmware, an OS, and peripheral devices.

  As described above, the configuration of the present invention may be realized by software or hardware.

  The reproduction control apparatus according to the present invention has an effect that enables a time keeping function to be accurately realized, and is useful as a television, STB, or the like that controls recording and reproduction via a network.

Network configuration diagram according to Embodiments 1 and 2 of the present invention Configuration diagram of server terminal in Embodiments 1 and 2 of the present invention Configuration diagram of client terminal according to Embodiments 1 and 2 of the present invention The figure which shows the sequence at the time of pause operation of the time keeping function in Embodiment 1 of this invention Block diagram schematically showing the configuration and operation of the control unit 204 The figure which shows the sequence at the time of reproduction | regeneration resumption operation of the time keep function in Embodiment 2 of this invention (A) The figure which shows the time change of the program handled by the time keeping function in Embodiment 1, 2 of this invention (b) The program handled when the time keeping function is implement | achieved by the server terminal-client terminal which is not this invention Of change over time The figure which shows the other structural example of the client terminal of this invention The figure which shows an example of the sequence which shows the procedure in the case of performing a time keeping function on a network

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Communication line 100 Server terminal 101 Tuner part 102 Demodulation part 103 Accumulation part 104 Control part 105 Transmission part 106 Reception part 200 Client terminal 201 Tuner part 202 Demodulation part 203 Decoding part 204 Control part 204a Memory 204b CPU
204c Comparator 204d Converter 205 Transmission unit 206 Reception unit 207 Input unit 208 Output unit 208a Frame memory

Claims (19)

A server device having a storage unit and capable of receiving AV data;
A reproduction control system comprising a reproduction control device connected to the server device via a network,
The server device
A command receiving unit for receiving a command from the playback control device;
A response issuing unit that issues a response according to a command from the reproduction control device;
The playback control device
An input unit capable of inputting at least AV data;
A command receiving unit that receives commands from the user;
A command issuing unit that issues a command to the server device in response to a command from the command receiving unit;
A response receiving unit that receives the response from the server device;
A display unit for displaying AV data input from the input unit;
A display control unit that performs control to temporarily stop display output from the display unit,
The playback control device
When the command accepting unit accepts the display pause command while the display unit displays the AV data input from the input unit, the command issuing unit displays the display to the server device. Issuing a recording command for recording the same AV data as the AV data in the storage unit;
The server device
When the command receiving unit receives the recording command, the playback control device receives the same AV data as the AV data being displayed and records it as AV content in the storage unit, and the response issuing unit Issuing a recording start response to the effect that the recording of the AV data according to the command is started, to the reproduction control device;
The playback control device
When the response receiving unit receives the recording start response, the display control unit executes the pause operation. A playback control device connected via a network to a server device capable of receiving AV data, having a storage unit, a command receiving unit that receives commands, and a response issuing unit that issues responses according to the commands,
An input unit capable of inputting at least AV data;
A command receiving unit that receives commands from the user;
A command issuing unit that issues a command to the server device in response to a command from the command receiving unit;
A response receiving unit that receives the response from the server device;
A display unit for displaying AV data input from the input unit;
A display control unit that performs control to temporarily stop display output from the display unit,
The command issuing unit displays a display to the server device when the command receiving unit receives a display pause command while the display unit displays the AV data input from the input unit. Issuing a recording command for recording the same AV data as the AV data in the storage unit as AV content;
The response receiving unit receives the same AV data as the AV data being displayed by the reproduction control device in response to the command receiving unit of the server device receiving the recording command, and records it in the storage unit When a recording start response is received indicating that
The display control unit is a reproduction control device that executes the pause operation. The command issuing unit issues a reproduction start request for the AV content recorded by the storage unit to the server device when the command receiving unit receives a command to cancel the suspension control by the user.
When all or part of the AV content reproduced from the storage unit in response to the reproduction start request is input from the server device to the input unit, the display control unit cancels the suspension control. The playback control device according to claim 2, wherein the display on the display unit is switched from the AV data in the paused state to the display of the AV content input from the server device.   The playback control according to claim 2, wherein the AV content is displayed on the display unit continuously from a corresponding stop position corresponding to a pause position of the AV data paused by the pause control. apparatus. A pause position information detection unit for detecting pause position information related to a pause position of the AV data paused by the pause control;
A pause position information storage unit for storing the pause position information;
A corresponding stop position detecting unit that detects the corresponding stop position in the AV content reproduced by the server device using the temporary stop position information;
5. The reproduction start request is a request to reproduce the AV content recorded in the storage unit by the server device from the recording instruction from the corresponding stop position detected by the corresponding stop position detecting unit. The playback control device according to 1. The command issuing unit issues a pre-play command for playing the AV content recorded by the storage unit in advance to the server device;
When the corresponding stop position detection unit receives an input of the AV content reproduced from the server device in response to the preliminary reproduction command, the corresponding stop position detection unit uses the temporary stop position information to respond to the server in accordance with the preliminary reproduction command. The playback control device according to claim 5, wherein the corresponding stop position is detected in the AV content played back by the device.   The reproduction control device according to claim 6, wherein the command issuing unit issues the pre-regeneration command until at least the command receiving unit receives the release command.   The reproduction control device according to claim 6, wherein the command issuing unit issues the pre-regeneration command after the command receiving unit receives the release command. A pause position information detection unit for detecting pause position information related to a pause position of the AV data paused by the pause control;
A pause position information storage unit for storing the pause position information;
A corresponding stop position detecting unit that detects the corresponding stop position in the AV content reproduced by the server device using the temporary stop position information;
The playback start request is a request to play back the AV content recorded by the server device according to the recording command from the start of recording,
The reproduction control apparatus according to claim 4, wherein the display control unit outputs the AV content to the display unit from the corresponding stop position detected by the corresponding stop position detection unit.   The reproduction control device according to claim 4, wherein the corresponding stop position is described by information for the server device to manage the AV content.   The reproduction control apparatus according to claim 4, wherein the corresponding stop position is described by information for the server apparatus to process the AV data. The AV data includes time information embedded at specific time intervals,
The reproduction control apparatus according to claim 5 or 9, wherein the pause position information is the time information. The AV data is in MPEG2-TS format with a time stamp,
The reproduction control apparatus according to claim 12, wherein the time information is a time stamp. The AV data is in MPEG2-TS format,
The reproduction control apparatus according to claim 12, wherein the time information is PTS (Packetized Time-Stamp).   The reproduction control apparatus according to claim 2, wherein a communication protocol used in the network is HTTP (Hyper Text Transfer Protocol).   The reproduction control apparatus according to claim 2, wherein a communication protocol used in the network is UPnP (Universal Plug and Play). A server device having a storage unit and capable of receiving AV data;
A reproduction control method using the server apparatus and a reproduction control apparatus connected via a network,
The server device
A command receiving step for receiving a command from the reproduction control device;
Executing a response issuing step of issuing a response in accordance with a command from the reproduction control device;
The playback control device
An input process for inputting at least AV data;
A command receiving process for receiving commands from the user;
In response to a command by the command receiving step, a command issuing step for issuing a command to the server device;
A response accepting step for accepting the response from the server device;
A display step of displaying the AV data input from the input step;
And at least a display control step for performing control to temporarily stop display output by the display step,
When displaying the AV data input by the input step by the display step of the reproduction control device, if a command to pause the display is received by the command receiving step, To the server device, issue a recording command for recording the same AV data as the AV data being displayed in the storage unit;
The server device
When the recording command is received by the command receiving step, the playback control device receives the same AV data as the AV data being displayed and records it as AV content in the storage unit,
As the response issuing step, a recording start response to the effect that recording of the AV data according to the recording command is started is issued to the reproduction control device,
The playback control device
A reproduction control method for executing the pause operation as the display control step when the recording start response is received by the response receiving step.   3. The playback control device according to claim 2, wherein the command issuing unit that issues a command to the server device in response to a command from the command receiving unit, and a control for temporarily stopping display output from at least the display unit. A program for causing a computer to function as a display control unit.   A recording medium on which the program according to claim 18 is recorded, wherein the recording medium can be processed by a computer.

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