JP2019154072A - Recording/playback device - Google Patents

Abstract

To provide a recording/playback device capable of efficiently processing a program waiting post-conversion processing.SOLUTION: A recording/playback device 100 includes a stream extraction part 102, a stream storage section 107, a decoding section 108 for decoding a first stream read from the stream storage section 107 and converting into a program signal, an encoder part 110 for encoding the program signal and converting into a second stream, and a control section 120. The control section 120 controls the decoding section 108 and the encoder part 110 so as to encode multiple first streams, recorded in the stream storage section 107, into second streams in the order determined based on the information indicating the resolution or the coding system of a video signal contained in the first stream, and when the resolution of the video signal and the coding system of the video signal are identical, encodes into a second stream in the order determined based on the length of recording time of the first stream.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for recording a stream of a digital broadcast program corresponding to a plurality of resolutions and a plurality of encoding methods, a method for directly recording without changing specifications such as a bit rate, and a method for recording by changing the bit rate. The present invention relates to a recording / reproducing apparatus that supports both of the above.

  In recent years, as a recording / playback device for recording digital signals of digital broadcasting, a decoder (decoder) and an encoder (encoder) are installed, and by recording with a lower digital signal bit rate, Some have made it possible to record. The process of reducing the bit rate of the digital signal is realized by the decoder once decoding the encoded digital signal and then re-encoding it at the desired bit rate. .

  In this specification, a recording method for recording a digital signal stream by converting specifications such as a bit rate, a recording mode, or an encoding method using a decoder and an encoder is referred to as “re-encoding recording”. A recording method for directly recording without changing the specification is referred to as “stream direct recording”.

  In a recording / reproducing apparatus, in order to be able to simultaneously execute a plurality of processes using a decoder and an encoder, it is necessary to install a plurality of decoders and encoders in the recording / reproducing apparatus. Therefore, when the decoder and the encoder are realized by hardware, dedicated hardware is required, and the manufacturing cost of the recording / reproducing apparatus increases. Even when the decoder and the encoder are realized by software, a CPU (Central Processing Unit) having a higher processing capacity and a large-capacity memory are required, and in this case, the manufacturing cost also increases.

  For this reason, for example, Patent Document 1 discloses a recording / reproducing apparatus that records both a stream direct recording and a re-encode recording when a digital signal stream is recorded on a recording medium. In the recording / reproducing apparatus described in Patent Document 1, if it is necessary to use a decoder and an encoder for other processing during re-encoding recording, only direct stream recording is continued and re-encoding recording is stopped. Then, after the decoder and encoder become available again, re-encode recording is performed using the directly recorded stream. In the recording / reproducing apparatus described in Patent Document 1, by performing the above operations, it is possible to perform simultaneous operations such as re-encoding recording and reproduction of other streams during re-encoding recording without increasing the number of decoders and encoders. It is said.

  However, in the recording / reproducing apparatus described in Patent Document 1, if it becomes necessary to use a decoder and an encoder for other processing during stream recording, a stream directly recorded program that needs to be re-encoded later remains on the recording medium. . When the decoder and encoder become usable again, for example, after the user has finished using the recording / playback device and turned off the power with the remote control, the recorder / encoder was interrupted in anticipation of a time period when the recording / playback device was not used. It is necessary to perform re-encoding recording processing. In this specification, the re-encode recording process performed after the stream direct recording is referred to as “post-conversion process”.

  The post-conversion process generally requires a time approximately equal to the program broadcast time. Therefore, when the frequency with which the user uses the recording / reproducing apparatus is high, that is, when the time during which the recording / reproducing apparatus is not used is relatively short, a large number of streams waiting for post-conversion processing remain on the recording medium. Also, for example, when the user turns on the power of the recording / playback apparatus with the remote control during the post-conversion process, the post-conversion process is quickly interrupted, the decoder and encoder can be used, and the post-conversion process is performed halfway Is discarded. Therefore, the post-conversion process is difficult to complete for a long-time program such as a movie, and the post-conversion process may not be started for the next program because the long-term program post-conversion process is not completed.

  In order to solve the above problem, for example, in Patent Document 2, when there are a plurality of streams to be post-converted in a recording medium, the recording time of the broadcast program, the attribute of the broadcast program, the genre of the broadcast program, the reproduction history A technique for determining the order of post-conversion processing according to a predetermined priority such as presence / absence, post-conversion processing interruption presence / absence or presence / absence of viewing history is disclosed.

JP 2012-227577 A JP 2014-216891 A

  On the other hand, according to the second interim report of the follow-up meeting on the 4K / 8K roadmap announced by the Ministry of Internal Affairs and Communications in July 2015, 4K / 8K practical broadcasts with higher resolution than the current 2K broadcasts will be released in 2018. The current 2K broadcasting and 4K / 8K broadcasting are expected to coexist.

  In addition, MPEG (Moving Pictures Experts Group) 2 system, which is a video encoding system used in the current 2K broadcast, The H.264 / MPEG4-AVC (Advanced Video Coding) system (hereinafter referred to as “H.264 system”) is not an H.264 / MPEG4-AVC system. H.265 | HEVC (High Efficiency Video Coding) method (hereinafter referred to as “HEVC method”) is also used. While the HEVC method boasts high compression efficiency, it has higher CPU processing capacity, larger memory capacity and higher power consumption than MPEG2 when encoding a broadcast digital signal or decoding an encoded stream. Need. For example, when decoding 4K / 8K broadcast data broadcast directly in the HEVC format for re-encoding and recording data, inconvenience such as restriction of other device operations may occur.

  Therefore, an object of the present invention is to provide a recording / reproducing apparatus capable of efficiently processing a program waiting for post-conversion processing.

  The recording / reproducing apparatus according to the present invention includes a stream extraction unit that receives an encoded broadcast program and extracts a first stream, a stream storage unit that records the first stream extracted by the stream extraction unit, A decoder unit that decodes the first stream read from the stream storage unit and converts it into a program signal, an encoder unit that encodes the program signal and converts it into a second stream, the stream extraction unit, and the stream storage A control unit that controls operations of the decoder unit and the encoder unit, wherein the control unit converts the plurality of first streams recorded in the stream storage unit into video signals included in the first stream The second stream is encoded in the order determined based on the information indicating the resolution or the encoding method. And controlling the decoder unit and the encoder unit, and when the resolution of the video signal and the encoding method of the video signal are the same, the order determined based on the length of the recording time of the first stream To encode into the second stream.

  According to the present invention, the control unit determines the plurality of first streams recorded in the stream storage unit in the order determined based on the information indicating the resolution or encoding method of the video signal included in the first stream. When the decoder unit and the encoder unit are controlled to encode into two streams, and the resolution of the video signal and the encoding method of the video signal are the same, the order determined based on the length of the recording time of the first stream Encode to the second stream.

  Accordingly, it is possible to efficiently process a program waiting for post-conversion processing that needs to be decoded by a high-resolution or high-efficiency encoding method.

It is a functional block diagram of the recording / reproducing apparatus which concerns on embodiment. It is a figure which shows an example of the list | wrist of the program which performs post-conversion processing in the order determined by the predetermined priority. It is a figure which shows an example of the schedule which performs a post-conversion process in the order determined by the predetermined priority. It is a figure which shows an example of the list | wrist of the program which performs a post-conversion process in the order determined based on the information which shows a resolution or an encoding system. It is a figure which shows an example of the schedule which performs a post-conversion process in the order determined based on the information which shows a resolution or an encoding system.

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

<Configuration>
FIG. 1 is a functional block diagram of the recording / reproducing apparatus 100 according to the present embodiment. As shown in FIG. 1, the recording / reproducing apparatus 100 includes a stream extraction unit 102, a stream control unit 106, and a stream storage unit 107. The stream extraction unit 102 includes a tuner unit 102a and a transport stream decoder unit 102b (hereinafter referred to as “TS decoder unit”).

  The recording / reproducing apparatus 100 further includes a decoder unit 108 and an encoder unit 110. The recording / reproducing apparatus 100 further includes a control unit 120, a ROM (Read Only Memory) unit 121, and a RAM (Random Access Memory) unit 122. The recording / reproducing apparatus 100 further includes an operation instruction receiving unit 131 that receives a signal from an external operation instruction transmitting unit 130 (for example, a remote controller). Each unit is connected to the control unit 120 by a bus line 123.

  The stream extraction unit 102 receives the encoded broadcast program and extracts a recording partial transport stream. More specifically, the tuner unit 102a has a resolution of 2K or 4K from the external antenna 101, an MPEG2 encoding format, An RF (Radio Frequency) signal including a plurality of digital broadcast channels corresponding to H.264 or HEVC is received. Then, the tuner unit 102a performs a tuning process and a demodulation process for an arbitrary broadcast radio wave frequency, and extracts a recording transport stream (hereinafter referred to as “recording TS”). In the following description, unless otherwise specified, “resolution” means the resolution of the video signal, and “encoding method” means the encoding method of the video signal.

  The recording TS is input to the TS decoder unit 102b. The TS decoder unit 102b extracts a recording partial transport stream (hereinafter referred to as “first stream”) including only information (video information, audio information, etc.) necessary for reproduction from the recording TS. The first stream has a resolution of 2K or 4K, an encoding scheme of MPEG2, H.264. H.264 or HEVC. The first stream is input to the stream control unit 106. The stream control unit 106 directly records the first stream in the stream storage unit 107. The stream storage unit 107 is realized by, for example, an HDD (Hard Disk Drive).

  Further, the stream control unit 106 can output the first stream input from the TS decoder unit 102b to the decoder unit 108. The decoder unit 108 has a resolution of 2K or 4K, an encoding method of MPEG2, H.264. H.264 or HEVC decoding is supported, and the decoded program signal (video signal and audio signal) can be output to the encoder unit 110. The encoder unit 110 has, for example, a resolution of 2K or 4K and an encoding method of MPEG2 or H.264. H.264 can encode a received program signal (video signal and audio signal) to generate a re-encoded recording partial transport stream (hereinafter referred to as a “second stream”). In the present embodiment, the second stream has, for example, a resolution of 2K and an encoding method of H.264. It is assumed that H.264 is supported. The second stream is recorded in the stream storage unit 107 via the stream control unit 106.

  The stream control unit 106 outputs the first stream received from the TS decoder unit 102b to the decoder unit 108 when viewing the program, and the first or second stream read from the stream storage unit 107 when reproducing the program. The decoder unit 108 decodes the first or second stream, generates a video signal and an audio signal, and outputs them from the video / audio output terminal to an external display device, a speaker, and the like.

  The control unit 120 is realized by, for example, a microcomputer, operates according to a program code stored in the ROM unit 121, and uses the RAM unit 122 as a work area. The control unit 120 controls operations of the tuner unit 102a, the TS decoder unit 102b, the stream control unit 106, the decoder unit 108, and the encoder unit 110 via the bus line 123.

  The operation instruction receiving unit 131 receives a user's operation command from the operation instruction transmitting unit 130 configured with a remote controller or an infrared transmitter. The operation instruction receiving unit 131 is connected to the control unit 120 via the bus line 123.

<Operation when watching a program>
When viewing of a digital broadcast program is started using the recording / reproducing apparatus 100, when the user presses the power key of the operation instruction transmission unit 130, a corresponding key code is transmitted to the control unit 120 via the operation instruction reception unit 131. Sent to. The control unit 120 controls the tuner unit 102a to tune to an arbitrary channel frequency (generally, the channel selected last time when viewed last time), and starts demodulation processing.

  When the demodulating process is completed, the control unit 120 controls the TS decoder unit 102b to extract and analyze information for specifying a program called PSI (Program Specific Information) information from the recording TS, and broadcast it. A first stream is generated by filtering data packets such as a video signal and an audio signal of a program. The control unit 120 also extracts and analyzes program arrangement information called SI (Service Information) information that stores program attributes such as a program title and a program genre.

  Next, the control unit 120 controls the stream control unit 106 to transmit the first stream as it is to the decoder unit 108. The decoder unit 108 generates a video signal and an audio signal from the first stream. The digital broadcast video signal has a resolution of 2K or 4K, MPEG2 format, H.264, and so on. It is encoded by an H.264 or HEVC encoding method. Audio signals of digital broadcasts are data-compressed using an encoding method such as an AAC (Advanced Audio Coding) method.

  The control unit 120 includes MPEG2, H.264, and the like built in the decoder unit 108. The H.264 or HEVC decoder and the AAC decoder are used to decode the first stream into uncompressed video and audio signals. The decoded video signal and audio signal are output as an image / audio output of the recording / reproducing apparatus 100 to an external display device, a speaker, or the like. As described above, the user can view the video and audio of the program currently broadcast on an arbitrary channel.

<Program recording operation>
When a digital broadcast program that is currently being received is recorded using the recording / reproducing apparatus 100, when the user presses a recording key provided in the operation instruction transmission unit 130, the corresponding key code is displayed in the operation instruction reception unit 131. Is transmitted to the control unit 120 via. Then, the control unit 120 starts broadcast program recording processing. At the stage when viewing is started, the stream control unit 106 has already received MPEG2, H.264, with a resolution of 2K or 4K. A first stream corresponding to the H.264 or HEVC encoding scheme is input. Then, the control unit 120 controls the stream control unit 106 to record the first stream in the stream storage unit 107. Through the above operation, the digital broadcast program being received is “stream-directly recorded”.

  Further, at the stage where recording is started, the stream control unit 106 outputs the first stream received from the TS decoder unit 102b to the decoder unit 108. The resolution is 2K or 4K, the encoding method is MPEG2, H.264. A decoder unit 108 that supports H.264 or HEVC decoding generates a video signal and an audio signal from the first stream. In addition to this operation, the control unit 120 can also control the decoder unit 108 to output the decoded video signal and audio signal to the encoder unit 110. The control unit 120 controls the encoder unit 110 to encode the video signal and the audio signal to generate a second stream. Next, the control unit 120 controls the stream control unit 106 to record the second stream in the stream storage unit 107. With the above operation, the digital broadcast program being received is “re-encoded and recorded”.

  Using the decoder unit 108 and the encoder unit 110, the resolution is 2K or 4K, the encoding method is MPEG2, H.264. For example, a first stream corresponding to H.264 or HEVC decoding has a resolution of 2K and an encoding method of H.264. By re-encoding to a second stream compatible with H.264 decoding, the stream specifications can be changed. Specifically, it is possible to reduce the bit rate of the second stream by changing the encoding method of the first stream or changing the resolution or the frame rate. By reducing the bit rate, the recording capacity of the stream storage unit 107 can be saved. Alternatively, the resolution is 2K and the encoding method is H.264. By changing to H.264, copying to a recording medium such as a Blu-ray disc that does not support 4K resolution or HEVC encoding becomes easy.

  When the user presses a stop key provided in the operation instruction transmission unit 130, a corresponding key code is transmitted to the control unit 120 via the operation instruction reception unit 131. Then, the control unit 120 starts a process for stopping the currently executed program recording operation. The control unit 120 controls the stream control unit 106 to stop the recording of the first and second streams in the stream storage unit 107.

  Note that only one of the stream direct recording operation and the re-encode recording operation may be performed, or may be performed simultaneously. In the above program viewing operation and program recording operation, the operation is started by the user operating the operation instruction transmission unit 130. On the other hand, it is also possible to start the program recording operation by automatically starting the recording / reproducing apparatus 100 at the broadcast time of a program designated in advance, such as reserved recording.

<Program playback operation>
When playing back a digital broadcast program recorded in the stream storage unit 107 using the recording / playback apparatus 100, the user presses a playback key provided in the operation instruction transmission unit 130, so that the corresponding key code is obtained. It is transmitted to the control unit 120 via the operation instruction receiving unit 131. Then, the control unit 120 starts a broadcast program reproduction process.

  The control unit 120 controls the stream control unit 106 to read the first or second stream recorded in the stream storage unit 107, that is, the recorded program stream, and transmits the read program stream to the decoder unit 108. Next, the control unit 120 controls the decoder unit 108 to generate a video signal and an audio signal from the first or second stream. Subsequent operations are the same as the program viewing operation, and thus description thereof is omitted.

  As described above, since it is necessary to use the decoder unit 108 at the time of program viewing and program playback operation, the re-encode recording operation cannot be performed during program viewing and program playback operation. That is, only the stream direct recording operation can be performed at the time of program viewing and program reproduction operation. Therefore, when the re-encoding recording operation is performed, the first stream is temporarily recorded once. Then, when the decoder unit 108 becomes usable, a post-conversion process is executed to perform a re-encode recording operation.

<Post-conversion processing operation (2K / MPEG2)>
A case will be described in which the recording / playback apparatus 100 is used to perform post-conversion processing of a digital broadcast program (that is, the first stream) that has been directly stream-recorded in the stream storage unit 107. The control unit 120 controls the stream control unit 106 to read the first stream of the program that requires post-conversion processing and is recorded in the stream storage unit 107 by direct stream recording and outputs the first stream to the decoder unit 108. Here, it is assumed that the first stream is recorded with a resolution of 2K and an encoding method of MPEG2.

  Next, the control unit 120 controls the decoder unit 108 to output the decoded video signal and audio signal to the encoder unit 110. Next, the control unit 120 controls the encoder unit 110 to encode the received video signal and audio signal to generate a second stream. Here, the second stream has a resolution of 2K and the encoding method is changed from MPEG2 to H.264. It is assumed that the H.264 system has been changed. Then, the control unit 120 controls the stream control unit 106 to record the second stream in the stream storage unit 107. With the above operation, the recorded digital broadcast program is “post-converted”.

  By using the decoder unit 108 and the encoder unit 110 to re-encode the directly recorded stream, the stream specification can be changed. In the present embodiment, the bit rate of the second stream can be reduced by changing the encoding method of the first stream to a method with higher compression efficiency. Therefore, the recording capacity of the stream storage unit 107 can be saved.

  As in the re-encoding recording, the post-conversion processing operation requires the use of the decoder unit 108, and therefore the post-conversion processing operation cannot be performed during program viewing and program playback operations. Therefore, the post-conversion process needs to be executed when the program reproduction operation is not performed. The time when the program playback operation is not performed is, for example, a power-off period after the user turns off the power of the recording / playback apparatus 100.

  However, even if the post-conversion processing operation is started during the power-off period of the recording / reproducing apparatus 100, if the power is turned on during the post-conversion processing, the control unit 120 immediately interrupts the post-conversion processing. The second stream generated halfway is deleted from the stream storage unit 107. This is to prevent the operation from being hindered when the user instructs the program reproduction operation.

  In general, the time required for the post-conversion processing is almost equal to the program broadcast time. Therefore, when the user turns on the power of the recording / reproducing apparatus 100 as the post-conversion processing of a program having a long broadcast time is performed. There is a high possibility of interrupting the process.

  However, if the resolution is 2K, the encoding method is MPEG2, and the first stream is recorded, the stream direct recording operation can be performed even if the decoder unit 108 is used. If it is a reserved recording operation in which the power is not turned on by the user, it can be processed in parallel with the post-conversion processing by performing the reserved recording operation by direct stream recording.

<Post-conversion processing operation (4K / HEVC)>
On the other hand, the first stream recorded in the stream storage unit 107 is recorded with a resolution of 4K and an encoding method of HEVC, and the second stream has a resolution of 2K and the encoding method is H.264. The post-conversion processing operation when changing to the H.264 system will be described. The control unit 120 controls the stream control unit 106 to read the first stream of the program that requires post-conversion processing and is recorded in the stream storage unit 107 by direct stream recording and outputs the first stream to the decoder unit 108.

  Next, the control unit 120 has a resolution of 2K or 4K, an encoding method of MPEG2, H.264, and the like. The decoder unit 108 corresponding to H.264 or HEVC decoding is controlled to output the decoded video signal and audio signal to the encoder unit 110. However, since the first stream is recorded with a resolution of 4K and an encoding method of HEVC, the decoder unit 108 requires more memory and CPU processing capability during operation.

  Next, the control unit 120 controls the encoder unit 110 to encode the received video signal and audio signal to generate a second stream, and controls the stream control unit 106 to convert the second stream into a stream storage unit. By recording in 107, the recorded digital broadcast program is “post-converted”. However, since the resolution of the video signal that is the output of the decoder unit 108, that is, the input of the encoder unit 110, is 4K, the encoder unit 110 again requires more memory and CPU processing capability.

  In general, by installing a large-capacity memory and a CPU capable of high-speed processing in the decoder unit 108 and the encoder unit 110, while processing the first and second streams of 4K resolution or HEVC, other processing, For example, stream direct recording processing can be performed, but the manufacturing cost of the recording / reproducing apparatus 100 increases.

  Even if the memory capacity and CPU processing capacity of the decoder unit 108 and the encoder unit 110 are kept low, when the resolution of the first stream recorded in the stream storage unit 107 is 2K and the encoding method is MPEG2, the post-conversion processing is in progress. It is possible to perform a stream direct recording operation. However, when the resolution of the first stream is 4K and the encoding method is the HEVC method, if the stream direct recording operation is performed, there is a possibility that the simultaneous processing cannot be performed due to insufficient memory capacity and CPU processing capacity. As a result, there is a possibility that the scheduled recording operation and the post-conversion process cannot be performed in parallel. Therefore, it is desirable not to simultaneously process the scheduled recording and the post-conversion process of the HEVC method at 4K resolution.

<Post-conversion processing order>
In the post-conversion processing operation described above, when there are a plurality of programs (that is, first streams) having different resolutions or encoding methods that are recorded in the stream storage unit 107 by direct stream recording and require post-conversion processing, In the embodiment, the post-conversion processing is performed in the order determined based on the information indicating the resolution or encoding method of the video signal included in the first stream.

  Next, the case where the post-conversion processing is performed in the order determined based on the predetermined priority and the case where the post-conversion processing is performed in the order determined based on the information indicating the resolution or the encoding method will be described.

  FIG. 2 is a diagram illustrating an example of a list of programs that perform post-conversion processing in the order determined by a predetermined priority. FIG. 3 is an example of a schedule that performs post-conversion processing in the order determined by a predetermined priority. FIG. As shown in FIG. 2, the control unit 120 determines the order of post-conversion processing of a plurality of programs according to a predetermined priority, and creates a list in advance. The list is stored in the RAM unit 122, for example. It is assumed that a plurality of first streams corresponding to five programs A to E that require post-conversion processing are recorded in the stream storage unit 107.

  In FIG. 2, the post-conversion processing order indicates the order in which post-conversion processing is performed. The recording date and time is the date and time when the program is recorded, the recording time is the length of the broadcast time of the program, the resolution is the resolution of the video signal, and the encoding method is the encoding method of the video signal.

  In the list shown in FIG. 2, the post-conversion processing order is determined based on the program recording date and time. That is, post-conversion processing is performed in order from the program with the oldest recording date. In the example illustrated in FIG. 2, post-conversion processing is performed in the order of program A, program B, program C, program D, and program E.

  In the present embodiment, when the resolution of a program to be subjected to post-conversion processing, such as program D or program E, is 4K and the encoding method is the HEVC method, simultaneous processing with the stream direct recording operation cannot be performed. . Therefore, the reserved recording operation and the post-conversion process cannot be performed in parallel, which is not preferable. Therefore, it is necessary to change the order of post-conversion processing such as performing post-conversion processing while avoiding the recording reservation time zone instead of simply performing post-conversion processing in order from the program with the oldest recording date and time.

  This will be specifically described. For example, in FIG. 3, it is assumed that a recording reservation is set at 8:00 am after the user turns off the power of the recording / reproducing apparatus 100 at 0:00 am. After the recording / reproducing apparatus 100 is turned off, a post-conversion process is started. However, when an attempt is made to process a program A, program B, program C, program D, and program E in order from the program with the oldest recording date and time, the 4K resolution is used. There is a possibility that the processing of the program E in the HEVC encoding method and the recording reservation overlap, and either of them must be interrupted.

  Thus, in the present embodiment, the order of post-conversion processing is determined based on information indicating the resolution or encoding method of the program. More specifically, the control unit 120 encodes the first stream into the second stream preferentially in descending order of the resolution of the video signal or in descending order of the processing load of the video signal encoding method. The unit 110 is controlled. 4 and 5, after the user turns off the power of the recording / reproducing apparatus 100, post-conversion processing is preferentially performed from the 4K resolution or HEVC encoding program until the next scheduled recording time.

  FIG. 4 is a diagram illustrating an example of a list of programs to be subjected to post-conversion processing in the order determined based on the information indicating the resolution or the encoding method. FIG. 5 is a diagram illustrating an example of a schedule for performing the post-conversion processing in the order determined based on the information indicating the resolution or the encoding method. In the present embodiment, post-conversion processing is performed in the order of program D, program E, program A, program B, and program C. In program D and program E, both the resolution and the encoding method are the same, but post-conversion processing is first performed for program D having a long recording time.

  As described above, 4D resolution or HEVC encoding program D or program E is preferentially post-converted regardless of the recording date and time, so that the recording reservation and 2K resolution H.264 can be performed. Since this is an overlap with the post-conversion processing of the program C of the H.264 encoding method, both can be made compatible. Of course, the user may turn on the power of the recording / reproducing apparatus 100 during the post-conversion process, but the probability that the post-conversion process of all programs can be completed must increase.

<Effect>
As described above, in the recording / reproducing apparatus 100 according to the embodiment, the control unit 120 converts the plurality of first streams recorded in the stream storage unit 107 into the resolution or encoding of the video signal included in the first stream. The decoder unit 108 and the encoder unit 110 are controlled to encode into the second stream in the order determined based on the information indicating the method.

  Accordingly, it is possible to efficiently process a program waiting for post-conversion processing that needs to be decoded by a high-resolution or high-efficiency encoding method.

  Further, post-conversion processing is performed during the power-off period after the recording / reproducing apparatus 100 is powered off, that is, the control unit 120 encodes the plurality of first streams recorded in the stream storage unit 107 into the second stream. In this manner, the decoder unit 108 and the encoder unit 110 are controlled. Therefore, high-resolution or high-efficiency encoding is possible without increasing the number of decoder units 108 and encoder units 110, or installing a large-capacity memory and a CPU capable of high-speed processing in the decoder unit 108 and encoder unit 110. It is possible to efficiently process a program waiting for a post-conversion process that needs to be decoded by this method.

  Since the number of programs waiting for post-conversion processing can be efficiently reduced, the free capacity of the stream storage unit 107 can be increased efficiently.

  Since the control unit 120 controls the encoder unit 110 to preferentially encode the first stream into the second stream in the descending order of the resolution of the video signal, the control unit 120 can perform encoding in the order of the high load on the memory and the CPU. . For this reason, post-conversion processing is less likely to be interrupted due to a recording reservation or the like, and it is possible to suppress waste of power required for encoding.

  Since the control unit 120 controls the encoder unit 110 to preferentially encode the first stream into the second stream in descending order of the processing load of the video signal encoding method, the load on the memory and the CPU is increased in descending order. Can be encoded. For this reason, post-conversion processing is less likely to be interrupted due to a recording reservation or the like, and it is possible to suppress waste of power required for encoding.

  In this embodiment, the resolution of the video signal is 2K or 4K, and the encoding method of the video signal is MPEG2, H.264, or the like. H.264 or HEVC, the video signal resolution may be 2K, 4K, or 8K, and the video signal encoding method may be MPEG2, H.264, or H.264. H.264, MPEG4-AVC, H.264. 265 or HEVC. Since the resolution of the video signal is 2K, 4K, or 8K, it can correspond to a high-resolution program. The video signal encoding method is MPEG2, H.264, or the like. H.264, MPEG4-AVC, H.264. Since it is H.265 or HEVC, it is possible to correspond to an encoding method with high compression efficiency.

  In this embodiment, since the resolution is 4K and the encoding method is the same in HEVC for both program D and program E in FIG. 4, the post-conversion processing order is changed based on the information indicating the resolution and the encoding method. However, if the resolution and the encoding method are different, the post-conversion processing order may be determined based on either the information indicating the resolution or the information indicating the encoding method.

  In the present embodiment, the post-conversion process is started immediately after the power of the recording / reproducing apparatus 100 is turned off. However, the post-conversion process is generally performed in the midnight time zone after 1:00 am when the audience rating is low. You may go. That is, the control unit 120 controls the decoder unit 108 and the encoder unit 110 so as to encode the plurality of first streams recorded in the stream storage unit 107 into the second stream in the midnight time zone. Therefore, by performing the post-conversion process using a time zone with a low audience rating, the possibility that the user turns on the power of the recording / reproducing apparatus 100 during the post-conversion process is reduced, and as a result, the post-conversion process is interrupted. Can be reduced.

  Next, the industrial applicability of the present invention will be described. The present invention is not limited to a device that receives a broadcast program corresponding to a plurality of resolutions and a plurality of encoding methods and displays them on an external or internal display, such as a digital broadcast recorder or a television receiver with a built-in hard disk. The present invention can be applied to a device intended to digitally record and reproduce a broadcast program on a recording medium.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  DESCRIPTION OF SYMBOLS 100 Recording / reproducing apparatus, 102 Stream extraction part, 107 Stream storage part, 108 Decoder part, 110 Encoder part, 120 Control part.

Claims (2)

A stream extraction unit that receives the encoded broadcast program and extracts the first stream;
A stream storage unit for recording the first stream extracted by the stream extraction unit;
A decoder unit for decoding the first stream read from the stream storage unit and converting it into a program signal;
An encoder for encoding the program signal and converting it into a second stream;
A control unit for controlling operations of the stream extraction unit, the stream storage unit, the decoder unit, and the encoder unit;
With
The control unit is configured to determine the plurality of first streams recorded in the stream storage unit in the order determined based on information indicating a resolution or an encoding method of a video signal included in the first stream. The decoder unit and the encoder unit are controlled so as to be encoded, and when the resolution of the video signal and the encoding method of the video signal are the same, it is determined based on the length of the recording time of the first stream A recording / reproducing apparatus that encodes the second stream in the order described.   2. The control unit according to claim 1, wherein the control unit controls the decoder unit and the encoder unit so as to preferentially encode the first stream into the second stream in order of a long recording time of the first stream. Recording and playback device.

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