WO2009139289A1 - 記録装置 - Google Patents
記録装置 Download PDFInfo
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- WO2009139289A1 WO2009139289A1 PCT/JP2009/058312 JP2009058312W WO2009139289A1 WO 2009139289 A1 WO2009139289 A1 WO 2009139289A1 JP 2009058312 W JP2009058312 W JP 2009058312W WO 2009139289 A1 WO2009139289 A1 WO 2009139289A1
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- bit rate
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
- G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/7921—Processing of colour television signals in connection with recording for more than one processing mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00007—Time or data compression or expansion
- G11B2020/00079—Time or data compression or expansion the compression ratio or quality level being adapted to circumstances, e.g. to the available recording space
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B2020/10935—Digital recording or reproducing wherein a time constraint must be met
- G11B2020/10981—Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2508—Magnetic discs
- G11B2220/2516—Hard disks
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2541—Blu-ray discs; Blue laser DVR discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/781—Television signal recording using magnetic recording on disks or drums
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/84—Television signal recording using optical recording
- H04N5/85—Television signal recording using optical recording on discs or drums
Definitions
- the present invention relates to a recording apparatus, and more particularly to a recording apparatus having a function of converting and recording the bit rate of an input stream.
- HDDs Hard Disk Drives
- additional data data-linked parts
- Patent Document 1 describes a technique for recording / reproducing not only such additional data but also a data broadcast, a broadcast other than the data broadcast, and a stream having related data other than the broadcast. . According to this, by separating the file for recording the broadcast and the file related to the broadcast, the data broadcast is recorded, and the recorded data broadcast is stored and edited separately from the main broadcast. I have to.
- the broadcast wave is not recorded as it is, but it is recorded by converting the bit rate with MPEG-2, or by converting the video and audio format, There is something that can record more content.
- Transcoding refers to converting video data compressed (encoded) into a file format into another encoding format, or converting only the encoded data rate (bit rate), It is mainly used for converting video images.
- various DVD recorders having a function of transcoding MPEG-2 HDTV video data of terrestrial digital broadcasting to MPEG-4 AVC / H264 (hereinafter referred to as H264) in real time have appeared from various home appliance manufacturers. .
- bit rate conversion when bit rate conversion is performed by this transcoding method, only video and audio are targeted at the time of bit rate conversion, so normally no other data (additional data, etc.) will remain.
- additional data such as subtitles and various information included in the broadcast wave can be reproduced and used in the DR (Direct Recording) mode in which the broadcast wave is directly recorded on the HDD, but the broadcast wave is re-encoded to H264 or the like.
- the additional data portion is discarded, and the additional data portion cannot be reproduced and used. This will be described with reference to FIGS. 4 and 5 below.
- FIGS. 4 and 5 are diagrams for explaining the bit rate conversion processing by the conventional recording apparatus.
- 101 is a tuner
- 102 is a control unit
- 103 is a transcoder.
- the main configuration of the recording apparatus is shown as a recorder.
- MPEG-2 TS Transport Stream
- This MPEG-2TS is roughly composed of video data, audio data, and additional data.
- MPEG-2TS including additional data is output from the control unit 102 to the transcoder 103 (S102).
- an AVC (Advanced Video Coding) TS composed only of video and audio is output from the transcoder 103 to the control unit 102 (S103).
- the additional data is discarded by the transcoder 103.
- MPEG-2TS is input from the tuner 101 to the control unit 102 (S111).
- This MPEG-2TS is mainly composed of video data, audio data, and additional data.
- MPEG-2TS not including additional data is output from the control unit 102 to the transcoder 103 (S112).
- AVCTS composed only of video and audio is output from the transcoder 103 to the control unit 102 (S113).
- the control unit 102 discards the additional data.
- the TS file roughly includes three types of video data, audio data, and additional data. Among these, the voice is a very small value of 0.2 to 0.4 Mbps in the case of AAC.
- the bit rate can be specified by the following method so that the content can be accommodated in the free (remaining) capacity of the BD.
- the total bit rate A is set to 11.9 Mbps, it is possible to store the content for 2 hours in the free capacity (10 GB) of the BD.
- the bit rate of the audio part is 0.4 Mbps, the target bit rate of the video is set to 11.5 Mbps. This makes it possible to efficiently perform dubbing by fully using the free space of the BD.
- a recorder having a large-capacity medium such as an HDD or a BD is designed so that the target bit rate is determined as described above and the bit rate converges within a certain time (on the order of several minutes).
- the present invention has been made in view of the above circumstances, and when recording an input stream on a recording medium by converting the bit rate, the remaining capacity of the recording medium remains while leaving additional data such as subtitles and weather forecasts. It is an object of the present invention to provide a recording apparatus capable of recording in consideration of the above.
- the first technical means of the present invention is a recording apparatus for recording an input stream including video data, audio data, and additional data after bit rate conversion, and recording the input stream
- a target total bit rate that is a target of the input stream is calculated based on time and a remaining capacity of a recording medium that is a recording destination of the input stream, and the target of the video data is calculated with respect to the calculated target total bit rate
- Video target bit rate setting means for setting a bit rate, and total bit rate measuring means for measuring the actual total bit rate of the input stream after starting bit rate conversion based on the target bit rate of the video data
- the video target bit rate setting means includes a difference between the actual total bit rate and the target total bit rate. Based on, so that the input stream including the additional data is within the remaining capacity of the recording medium is obtained by and adjusts the target bit rate of the video data.
- the video target bit rate setting means when the actual total bit rate is larger than the target total bit rate, the actual total bit rate and the target total The target bit rate of the video data is lowered by the difference from the bit rate.
- the video target bit rate setting means when the actual total bit rate is smaller than the target total bit rate, the actual total bit rate and the target total The target bit rate of the video data is increased by the difference from the bit rate.
- the target total bit rate is set for the target bit rate of the video data, the audio data, and the additional data. And an estimated bit rate.
- a fifth technical means is any one of the first to fourth technical means, wherein the video target bit rate setting means sets the target bit rate to a predetermined time when the target bit rate of the video data is changed. It is characterized in that the actual total bit rate is converged to the target total bit rate by repeatedly adjusting a predetermined amount every time.
- the sixth technical means is any one of the first to fifth technical means, wherein the total bit rate measuring means counts the number of packets of the input stream, and the data size per packet is added to the counted number.
- the actual total bit rate of the input stream is calculated by multiplying and dividing the multiplied data size by the recording time of the input stream.
- the present invention when recording an input stream on a recording medium after converting the bit rate, it is possible to record the recording medium in consideration of the remaining capacity of the recording medium while leaving additional data such as captions and weather forecasts. Video data, audio data, and additional data can be efficiently stored in the remaining capacity.
- FIG. 1 is a block diagram illustrating a configuration example of a recording apparatus according to an embodiment of the present invention. It is a figure for demonstrating an example of the bit rate conversion process by the recording device based on this invention. It is a figure for demonstrating the Example in case the content (TS file) recorded on HDD at DR mode is bit-rate-converted and dubbed to BD. It is a figure for demonstrating the bit rate conversion process by the conventional recording device. It is a figure for demonstrating the bit rate conversion process by the conventional recording device.
- FIG. 1 is a block diagram showing a configuration example of a recording apparatus according to an embodiment of the present invention.
- the recording apparatus 10 is equipped with a tuner 12, a transcoder 13, and an external recording medium (BD, DVD, etc.) and an input / output interface (input / output I / F) 14 for inputting / outputting data (writing / reading).
- a light receiving unit for receiving operation signals from a control unit 15 including a CPU and a ROM for controlling processing of the entire apparatus, a decoder 16, an HDD (hard disk drive) 17, and an operation input unit such as a remote controller.
- a remote control receiver 18 having a display unit and a display device (not shown) (for example, a CRT device, a plasma display device, a liquid crystal display device, an organic / inorganic display) externally connected to a stream received via the antenna 11 or a recorded stream
- a display output unit 19 that outputs to a display means such as an EL device, and an audio output unit 2 connected to a speaker, an external speaker, or the like included in the display device It is equipped with a door.
- the recording apparatus 10 shown in FIG. 1 has a configuration capable of receiving both analog broadcast waves and digital broadcast waves, but may be configured to receive only one of the broadcast waves.
- the recording device 10 includes, for example, a hard disk recorder with built-in digital tuner or a BD (Blu-Ray) recorder or DVD recorder, a hard disk integrated BD recorder or DVD recorder, or a hard disk recorder or BD recorder to which a digital tuner can be connected externally. It can be used for a DVD recorder, a hard disk integrated BD recorder, a DVD recorder, and the like. Further, when a digital tuner such as STB (Set Top Box) is externally connected, the tuner 12 may be unnecessary.
- BD Blu-Ray
- HD hard disk
- BD or DVD portable recording media can be used as the recording medium, but the recording medium is not limited to these, and all recording media capable of recording a stream are used. It is possible to apply.
- the stream is, for example, MPEG-2TS, and this MPEG-2TS is roughly composed of video data, audio data, and additional data.
- the additional data is additional data (text, image) other than video and audio, and includes, for example, captions and weather forecasts.
- the tuner 12 When viewing a digital broadcast using the recording device 10, the tuner 12 demodulates a high-frequency signal (digital modulation signal) input from the antenna 11 and inputs the demodulated signal to the decoder 16.
- the decoder 16 decodes the input demodulated signal into a video signal and an audio signal, generates a display control output signal from the decoded signal, outputs the display control output signal to the display output unit 19, and outputs the display control output signal from the decoded signal.
- a voice control output signal is generated, and the voice control output signal is output to the voice output unit 20.
- the display control output signal output from the display output unit 19 is input to a display device such as a television connected to the recording device 10, and the audio control output signal output from the audio output unit 20 is connected to the recording device 10. Is input to the speaker of the display device.
- the user can view a digital broadcast program corresponding to the display control output signal and the audio control output signal through a display screen and a speaker included in the display device.
- the tuner 12 demodulates a high frequency signal (analog modulation signal) input from the antenna 11, and encodes the demodulated signal by an encoder (not shown). To do. Furthermore, the encoded data is converted into a format (stream) suitable for recording and recorded as recorded data on various recording media such as the HDD 17 or BD.
- the tuner 12 demodulates a high frequency signal (digital modulation signal) input from the antenna 11 and records it on various recording media such as the HDD 17 or BD.
- the decoder 16 decodes the recorded data recorded on the HDD 17 or BD and converts it into a format that can output video and displays it. In addition to being output to the output unit 19, it is converted into a format that can output audio and output to the audio output unit 20.
- the display control output signal output from the display output unit 19 is input to a display device such as a television connected to the recording device 10, and the audio control output signal output from the audio output unit 20 is connected to the recording device 10. Is input to the speaker of the display device. The user can view the recorded title corresponding to the display control output signal and the audio control output signal through the display screen and the speaker included in the display device.
- the recording device 10 since the recording device 10 includes the transcoder 13, the digital broadcast wave (input stream) is not recorded on the HDD 17 or the BD as it is, but the bit rate is converted and recorded as it is in the MPEG-2 TS.
- the video and audio data formats can be converted and recorded.
- terrestrial digital broadcast MPEG-2 HDTV video data can be transcoded in real time to MPEG-4 AVC / H264.
- the main characteristic part of the present invention is that, when an input stream is recorded on a recording medium after bit rate conversion, recording is performed in consideration of the remaining capacity of the recording medium while retaining additional data such as subtitles and weather forecasts. .
- the recording apparatus 10 uses the target total bit rate that is the target of the input stream based on the recording time of the input stream and the remaining capacity of the recording medium (such as HDD 17 or BD) that is the recording destination of the input stream.
- control unit 15 corresponding to the video target bit rate setting means for setting the video data target bit rate with respect to the calculated target total bit rate, and starts bit rate conversion based on the video data target bit rate
- a transcoder 13 corresponding to total bit rate measuring means for measuring the actual total bit rate of the input stream. Based on the difference between the actual total bit rate and the target total bit rate, the control unit 15 adjusts the target bit rate of the video data so that the input stream including the additional data fits in the remaining capacity of the recording medium.
- FIG. 2 is a diagram for explaining an example of bit rate conversion processing by the recording apparatus 10 according to the present invention.
- the recording apparatus 10 is used as a recorder, and only the main configuration (tuner 12, transcoder 13, and control unit 15) is shown.
- the transcoder 13 and the control unit 15 are connected by PCI (Peripheral-Components-Interconnect)
- the TS from the tuner 12 always passes through the control unit 15.
- the transcoder 13 can directly receive the TS from the tuner 12, and the transcoder 13 and the control unit 15 can be connected by TS input / output.
- MPEG-2 TS Transport Stream
- This MPEG-2TS is roughly composed of video data, audio data, and additional data.
- MPEG-2TS including additional data is output from the control unit 15 to the transcoder 13 (S2).
- AVCTS composed of video data, audio data, and additional data is output from the transcoder 13 to the control unit 15 (S3).
- the control unit 15 records the AVCTS compressed by the transcoder 13 on the HDD 17 or BD.
- the AVCTS compressed by the transcoder 13 includes additional data, and the additional data is not discarded by the bit rate conversion.
- 21 is a target bit rate of video data (hereinafter referred to as video target bit rate)
- 22 is an estimated bit rate (hereinafter referred to as audio / additional estimated bit rate) of (audio data + additional data)
- 23 is (audio data + (Additional data) actual actual bit rate (hereinafter referred to as audio / additional actual bit rate)
- 24 represents a bit rate after conversion of the video data after bit rate conversion (hereinafter referred to as bit rate after video conversion).
- the dubbing conditions are the same as in the above-described conventional example, the remaining capacity of BD is 10 GB, and the content recording time is 2 hours.
- the content recording time is a time required for recording the content, and can be obtained from, for example, SI (Service Information) added to the content or an electronic program guide.
- the remaining capacity of the recording medium is a recordable free capacity in the HDD 17 or BD, and is managed by the control unit 15. This remaining capacity does not necessarily have to be the entire remaining capacity of the recording medium, and may be a part of the remaining capacity.
- the total remaining capacity of the BD may be 20 GB, and 10 GB of the remaining capacity may be set as the remaining capacity.
- the relationship between the target total bit rate B1 shown in FIG. 3A, the actual total bit rate B2 shown in FIG. 3B, and the converted total bit rate B3 shown in FIG. 3C is as follows.
- Total target bit rate Target video bit rate + Audio / Additional estimated bit rate
- Actual total bit rate target video bit rate + audio / additional actual bit rate
- Total bit rate after conversion Bit rate after video conversion + Audio / Additional actual bit rate (3)
- the voice / additional estimated bit rate 22 is set in the recording apparatus 10 for the voice data and the additional data.
- the audio / addition estimated bit rate 22 is a provisional setting value for determining the video target bit rate 21.
- the actual (audio data + additional data) bit rate may be measured for various contents, and the average value of the measurement results may be set.
- the target total bit rate B1 of the content is calculated based on the recording time of the content and the remaining capacity of the BD that is the recording destination of the content, and the video target bit rate 21 is set with respect to the calculated target total bit rate B1.
- the recording apparatus 10 measures the actual total bit rate B2 when the bit rate has converged (about 10 minutes) after a predetermined time has elapsed since the start of the bit rate conversion based on the video target bit rate 21. To do.
- the actual total bit rate B2 the following method can be considered.
- the transcoder 13 calculates the actual total bit rate B2, that is, the total bit rate of AVCTS, and periodically notifies the controller 15 of this.
- the transcoder 13 calculates the actual total bit rate B2, writes it in the internal register, and the control unit 15 reads the actual total bit rate B2 in the internal register at an appropriate timing.
- the control unit 15 counts the data (AVCTS) from the transcoder 13, and calculates the actual total bit rate B2 by dividing the file size from the start of recording by the recording time.
- the control unit 15 calculates the file size by counting the number of DMA (Direct Memory Access) transfer packets of the content and multiplying the packet size by one (one packet).
- the actual total bit rate B2 is calculated by dividing by the recording time of the TS file.
- the transcoder 13 functions as a total bit rate measuring means.
- the control unit 15 functions as a total bit rate measuring means, the actual total bit rate can be obtained even when the notification of the actual total bit rate B2 cannot be received from the transcoder 13. B2 can be calculated.
- the actual total bit rate B 2 is calculated, and the video target bit rate 21 is subtracted from this to obtain the audio / additional actual bit rate 23.
- the actual total bit rate B2 is 14.9 Mbps, and by subtracting 9.9 Mbps of the video target bit rate 21 from this, the audio / additional actual bit rate 23 is obtained as 5.0 Mbps. That is, the audio / additional actual bit rate 23 corresponds to the difference between the actual total bit rate B2 and the video target bit rate 21, and this difference is regarded as the bit rate of the audio / additional portion.
- the control unit 15 sets the video target bit by the difference between the actual total bit rate B2 and the target total bit rate B1, that is, the difference between the audio / addition actual bit rate 23 and the audio / addition estimated bit rate 22. Adjustments are made to reduce rate 21.
- the voice / additional actual bit rate 23 is 5 Mbps and the voice / additional estimated bit rate 22 is 2 Mbps, so the difference between them is 3 Mbps. This difference of 3 Mbps is subtracted from the video target bit rate 21 of 9.9 Mbps.
- the video target bit rate 21 is lowered to 6.9 Mbps, the image quality deteriorates sharply and the user feels uncomfortable when the image bit rate 21 is suddenly lowered.
- a method of reducing the video target bit rate 21 by 0.5 Mbps every 2 minutes is used. Therefore, it is preferable to adjust the bit rate. Thereafter, the actual total bit rate B2 is continuously monitored, and dubbing is performed so as to finally fit within the remaining capacity of the BD.
- the control unit 15 may The video target bit rate 21 is adjusted to be increased by the difference between the bit rate 23 and the audio / addition estimated bit rate 22.
- the voice / additional actual bit rate 23 is 1 Mbps
- the voice / additional estimated bit rate 22 is 2 Mbps, so the difference between the two is 1 Mbps.
- the difference of 1 Mbps is added to the video target bit rate 21 of 9.9 Mbps.
- the BD free capacity (10 GBytes) is stored for 2 hours including additional data. Can be used fully.
- the bit rate may be increased at one time.
- the bit rate may be adjusted by taking a method such as increasing by 0.5 Mbps every 2 minutes. After that, as in the above example, the actual total bit rate B2 is continuously monitored, and dubbing is performed so that it finally falls within the remaining capacity of the BD.
- the control unit 15 when changing the video target bit rate 21, the control unit 15 repeatedly adjusts the video target bit rate 21 by a predetermined amount every predetermined time (by applying feedback).
- the bit rate B2 can be converged to the target total bit rate B1.
- the content including the additional data is stored using the remaining capacity of the recording medium.
- the present invention is not limited to this example.
- content that has been bit-rate converted with respect to the remaining capacity set in a recording medium such as an HDD, BD, or DVD can be accurately stored including additional data. And the remaining amount of the recording medium can be accurately managed.
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Abstract
Description
A×60×60×2=10×8×1024×1024×1024より、
A=(10×8×1024×1024×1024)/(60×60×2)
=11930464.7
=11.9(Mbps)
また、記録装置10を用いてデジタル放送番組を記録する場合、チューナ12は、アンテナ11から入力された高周波信号(デジタル変調信号)を復調してHDD17又BD等の各種記録媒体に記録する。
図中、21は映像データの目標ビットレート(以下、映像目標ビットレート)、22は(音声データ+付加データ)の推定ビットレート(以下、音声/付加推定ビットレート)、23は(音声データ+付加データ)の実際の実ビットレート(以下、音声/付加実ビットレート)、24はビットレート変換後の映像データの変換後ビットレート(以下、映像変換後ビットレート)を示す。ダビングの条件は、前述の従来例と同様とし、BDの残容量が10GBytes、コンテンツの記録時間が2時間とする。
目標総ビットレート=映像目標ビットレート+音声/付加推定ビットレート (1)
実際の総ビットレート=映像目標ビットレート+音声/付加実ビットレート (2)
変換後総ビットレート=映像変換後ビットレート+音声/付加実ビットレート (3)
(a)トランスコーダ13が実際の総ビットレートB2、すなわちAVCTSの総ビットレートを算出し、これを定期的に制御部15に通知する。
(b)トランスコーダ13が実際の総ビットレートB2を算出し、これを内部レジスタに書き込み、制御部15が適当なタイミングで、内部レジスタ内の実際の総ビットレートB2を読み取る。
(c)制御部15がトランスコーダ13からのデータ(AVCTS)をカウントしておき、録画開始からのファイルサイズを記録時間で除算することで、実際の総ビットレートB2を算出する。
(d)制御部15がコンテンツのDMA(Direct Memory Access)転送のパケット数をカウントし、それに一回(1パケット)当りのデータサイズを乗算することで、ファイルサイズを算出し、このファイルサイズをTSファイルの記録時間で除算することで、実際の総ビットレートB2を算出する。
Claims (6)
- 映像データ,音声データ,及び付加データを含む入力ストリームをビットレート変換して記録する記録装置であって、
前記入力ストリームの記録時間と該入力ストリームの記録先となる記録媒体の残容量とに基づいて、前記入力ストリームの目標となる目標総ビットレートを算出し、該算出した目標総ビットレートに対して前記映像データの目標ビットレートを設定する映像目標ビットレート設定手段と、
前記映像データの目標ビットレートに基づいてビットレート変換を開始した後に、前記入力ストリームの実際の総ビットレートを計測する総ビットレート計測手段とを備え、
前記映像目標ビットレート設定手段は、前記実際の総ビットレートと前記目標総ビットレートとの差分に基づいて、前記付加データを含む前記入力ストリームが前記記録媒体の残容量に収まるように、前記映像データの目標ビットレートを調整することを特徴とする記録装置。 - 請求項1に記載の記録装置において、前記映像目標ビットレート設定手段は、前記実際の総ビットレートが前記目標総ビットレートよりも大きい場合、前記実際の総ビットレートと前記目標総ビットレートとの差分だけ、前記映像データの目標ビットレートを下げることを特徴とする記録装置。
- 請求項1に記載の記録装置において、前記映像目標ビットレート設定手段は、前記実際の総ビットレートが前記目標総ビットレートよりも小さい場合、前記実際の総ビットレートと前記目標総ビットレートとの差分だけ、前記映像データの目標ビットレートを上げることを特徴とする記録装置。
- 請求項1~3のいずれか1項に記載の記録装置において、前記目標総ビットレートは、前記映像データの目標ビットレートと、前記音声データ及び前記付加データに対して設定された推定ビットレートとから構成されることを特徴とする記録装置。
- 請求項1~4のいずれか1項に記載の記録装置において、前記映像目標ビットレート設定手段は、前記映像データの目標ビットレートを変更する場合に、該目標ビットレートを所定時間毎に所定量ずつ繰り返し調整し、前記実際の総ビットレートを前記目標総ビットレートに収束させることを特徴とする記録装置。
- 請求項1~5のいずれか1項に記載の記録装置において、前記総ビットレート計測手段は、前記入力ストリームのパケット数をカウントし、該カウント数に1パケット当りのデータサイズを乗算し、該乗算したデータサイズを、前記入力ストリームの記録時間で除算することにより、前記入力ストリームの実際の総ビットレートを算出することを特徴とする記録装置。
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EP09746496A EP2290654A4 (en) | 2008-05-16 | 2009-04-28 | RECORDING APPARATUS |
BRPI0912670A BRPI0912670A2 (pt) | 2008-05-16 | 2009-04-28 | aparelho de gravação |
JP2010511944A JPWO2009139289A1 (ja) | 2008-05-16 | 2009-04-28 | 記録装置 |
CN2009801183469A CN102027546A (zh) | 2008-05-16 | 2009-04-28 | 记录装置 |
US12/992,645 US20110069941A1 (en) | 2008-05-16 | 2009-04-28 | Recording apparatus |
MX2010012240A MX2010012240A (es) | 2008-05-16 | 2009-04-28 | Aparato de grabacion. |
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EP (1) | EP2290654A4 (ja) |
JP (1) | JPWO2009139289A1 (ja) |
CN (1) | CN102027546A (ja) |
BR (1) | BRPI0912670A2 (ja) |
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US8732479B1 (en) | 2010-03-12 | 2014-05-20 | Carbonite, Inc. | Methods, apparatus and systems for remote file storage using local client status files |
FR2993125A1 (fr) * | 2012-07-03 | 2014-01-10 | Thomson Licensing | Dispositif et procede d'enregistrement de donnees relatifs a une fonction de decalage temporel sur un support d'enregistrement |
FR2993127A1 (fr) * | 2012-07-03 | 2014-01-10 | Thomson Licensing | Dispositif et procede d'enregistrement de donnees relatifs a une fonction de decalage temporel sur un support d'enregistrement |
FR2993129A1 (fr) * | 2012-07-03 | 2014-01-10 | Thomson Licensing | Dispositif et procede d'enregistrement de donnees sur un support d'enregistrement |
CN109218724B (zh) * | 2017-07-06 | 2020-08-04 | 腾讯科技(深圳)有限公司 | 一种数据编码方法、装置及存储设备和终端设备 |
CN110769271B (zh) * | 2019-11-11 | 2021-09-14 | 广州酷狗计算机科技有限公司 | 调节多路码流的码率的方法和装置 |
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CN102027546A (zh) | 2011-04-20 |
JPWO2009139289A1 (ja) | 2011-09-15 |
BRPI0912670A2 (pt) | 2016-01-26 |
US20110069941A1 (en) | 2011-03-24 |
EP2290654A1 (en) | 2011-03-02 |
EP2290654A4 (en) | 2011-10-12 |
RU2452127C1 (ru) | 2012-05-27 |
MX2010012240A (es) | 2010-12-01 |
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