WO2011052045A1 - 映像再生装置及び映像再生装置の制御方法 - Google Patents
映像再生装置及び映像再生装置の制御方法 Download PDFInfo
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- WO2011052045A1 WO2011052045A1 PCT/JP2009/068439 JP2009068439W WO2011052045A1 WO 2011052045 A1 WO2011052045 A1 WO 2011052045A1 JP 2009068439 W JP2009068439 W JP 2009068439W WO 2011052045 A1 WO2011052045 A1 WO 2011052045A1
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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
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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
- G11B27/005—Reproducing at a different information rate from the information rate of recording
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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
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
Definitions
- the present invention relates to a video playback apparatus capable of special playback such as fast-forward playback of video, and a control method thereof.
- the frame rate of the distributed video stream data has been diversified.
- the video stream data for normal television broadcasting is 30 fps, but the video stream data for broadcasting for mobile terminals is 15 fps.
- video content with a high frame rate such as 240 fps and 480 fps is also increasing.
- H.264 / SVC Scalable Video Coding
- a high frame rate image such as 480 fps can be added and encoded. That is, even with a single video content, it is possible to select and play a video with a frame rate corresponding to the display capability of the playback device.
- a general display device often has a refresh rate of 60 Hz for video display. Recently, however, display devices capable of displaying at higher speeds such as 120 Hz and 240 Hz have appeared. In addition, a refresh rate is generally 30 Hz in a mobile device such as a mobile phone. The refresh rate indicates the number of times that an image (frame) is displayed per second.
- the movement is slower than the actual movement (this is slow motion). Or simply referred to as slow).
- a playback process that takes advantage of the characteristics of the frame rate of the video content.
- an image with a high frame rate uses the feature that the number of frames per unit time is large, and can perform slow playback that is finer and smoother than an image with a general frame rate.
- a video with a low frame rate has a small number of frames per unit time, the video does not change even when the slow playback speed is slowed down.
- the slow playback function of the current video playback device forces the user to play at a predetermined playback speed regardless of the difference in the frame rate of the video itself.
- the current slow playback function only executes slow playback at, for example, 1 ⁇ 2 speed when the slow playback button is pressed.
- the slow playback function is such that fixed values such as 1 ⁇ 2 times speed, 8 times speed, and 1/16 times speed are sequentially switched regardless of the difference in the frame rate of the video itself. That is, the current video playback device does not consider the frame rate of the video itself when determining the slow playback speed.
- Patent Document 1 controls the playback speed in special playback, but the playback speed is controlled by referring to the bit rate of the video data and performing control according to the frame rate. not going.
- the present invention provides a video playback apparatus capable of adaptively setting the slow playback speed according to the frame rate of the video content being played back and performing slow playback suitable for the video content, and a control method thereof. Objective.
- a video playback apparatus is a video playback apparatus capable of performing slow playback processing of video data stored in a storage unit, and detecting means for detecting a frame rate value of the video data And a determination means for determining a slow reproduction speed when the video data of the frame rate is slowly reproduced from the value of the frame rate detected by the detection means, and a slow reproduction speed determined by the determination means. And reproducing means for executing the slow reproduction processing of the video data.
- a video playback device control method is a video playback device control method capable of performing slow playback processing of video data stored in a storage unit, and includes a video data frame A detection step for detecting a rate value, a determination step for determining a slow playback speed when video data of the frame rate is played back slowly from the value of the frame rate detected in the detection step, and the determination step A playback step of executing a slow playback process of the video data using the slow playback speed.
- the video playback apparatus capable of adaptively setting the slow playback speed according to the frame rate of the video content being played back and performing the slow playback suitable for the video content, and the control thereof.
- a method can be provided.
- the video playback device of this embodiment is a device for playing back video displayed on a display panel having a refresh rate of 60 Hz. Specifically, the description will be made as a television having a video recording / reproducing unit.
- the video playback apparatus of the present invention may be a broadcast recorder having a configuration separate from the display panel.
- the video content to be played back is stream data in the MPEG2 TS (Transport Stream) format.
- This MPEG2 TS stream data includes H.264 Video data and audio data encoded by H.264 / SVC are multiplexed.
- H. It is assumed that video data encoded with H.264 / SVC is encoded hierarchically with video data with a frame rate of 30 fps and video data with 480 fps.
- H.264 / SVC is a known technique, the description thereof is omitted here.
- FIG. 1 is a block diagram illustrating the configuration of the video playback apparatus 100 according to the first embodiment.
- the storage unit 101 stores stream data as video content.
- the stream data is received by broadcasting or communication and stored in the storage unit 101.
- Read control unit 102 reads MPEG2 TS stream data stored in storage unit 101 and outputs the stream data to separation unit 103.
- the separation unit 103 separates the video stream data and the audio stream data from the input stream data, and outputs the video stream data and the audio stream data to the decoding unit 104. Also, the same video stream data as the video stream data output to the decoding unit 104 is output to the frame rate detection unit 111.
- the decoding unit 104 decodes the input video stream data and audio stream data, and outputs the decoded video data to the synthesis unit 106 and the decoded audio data to the audio output unit 105.
- the decoded video data output from the decoding unit 104 is video data in units of frames.
- the decoding unit 104 performs control to set the frame rate of video data in units of frames to 60 fps so as to be synchronized with the refresh rate of the display panel.
- the frame rate (referred to as a playback frame rate) related to the playback of the video output from the decoding unit 104 is always constant regardless of the frame rate of the input video data and the playback speed of the video data.
- the frame rate (referred to as “video frame rate”) of the video data inherent to the video input to the decoding unit 104 varies depending on the video content.
- the audio output unit 105 outputs the decoded audio data to the speaker.
- the speaker may be built in the video reproduction apparatus or may be configured separately.
- the synthesizing unit 106 performs a process of synthesizing graphics data such as a menu screen output from the control unit 108 with the decoded video data as necessary. Of course, when it is not necessary to synthesize graphics data, the decoded video data passes through the synthesizer 106.
- the video output unit 107 outputs the video data output from the synthesis unit 106 to the display panel.
- the control unit 108 is a control unit such as a CPU that comprehensively controls the video reproduction apparatus 100.
- the control unit 108 is responsible for generating graphics data such as a menu to be presented to the user in accordance with an instruction from the user or an internal state of the video playback device 100.
- the control unit 108 also executes graphics data generation processing and outputs the generated graphics data to the synthesis unit 106.
- control unit 108 In the slow playback operation described later, when the user presses a slow playback button provided on the remote controller, the control unit 108 notifies the playback speed determination unit 110 that the slow playback button has been pressed.
- the control unit 108 in FIG. 1 is described as being connected only to the combining unit 106 and the playback speed determining unit 110, but the control unit 108 is also connected to other functional units. It is assumed that they are connected via a signal line (not shown).
- the remote control signal reception unit 109 receives a remote control signal corresponding to a user operation instruction input by operating the remote control by the user.
- the playback speed determination unit 110 determines the playback speed of the video data, and outputs a control command indicating the determined speed to the decoding unit 104.
- the frame rate detection unit 111 analyzes the video data input from the separation unit 103 and detects the value of the input video frame rate.
- the video frame rate value detection process executed by the frame rate detection unit 111 will be described later.
- the value of the video frame rate detected by the frame rate detection unit 111 is input to the playback speed determination unit 110.
- the playback speed determination unit 110 outputs a control command for instructing the playback speed to the decoding unit 104 in accordance with the value of the input video frame rate.
- the playback speed determination unit 110 responds to the instruction input from the control unit 108 that has received the instruction input when the user inputs an instruction regarding special playback such as fast forward, rewind, and slow playback via the remote control. A control signal is received. Then, using the received instruction input, the video frame rate, and information regarding the current reproduction speed, the reproduction speed corresponding to the user instruction is determined and output to the decoding unit 104 as a control command.
- Video data playback processing using the video playback device 100 Next, an operation for reproducing video data using the above-described video reproduction device 100 will be described.
- the storage unit 101 stores stream data of video content received via broadcasting or communication.
- the control unit 108 instructs the read control unit 102 to read the video content specified by the user from the storage unit 101 in response to the instruction.
- the read control unit 102 reads out the transport stream data of the video content designated from the storage unit 101 and outputs it to the separation unit 103.
- the separation unit 103 executes processing for separating the input transport stream data into video stream data and audio stream data. Further, the video stream data classified by the separation unit 103 is input to the decoding unit 104 and the frame rate detection unit 111.
- the frame rate detection unit 111 analyzes the input video stream data and detects the frame rate of the video stream data. The detected value of the video frame rate is input to the playback speed determination unit 110.
- the playback speed determination unit 110 refers to the input video frame rate value and an instruction input related to the playback speed from the control unit 108, and transmits a control command indicating the playback speed to the decoding unit 104.
- the playback speed determining unit 110 transmits a control command indicating that 60 fps video data is displayed at 1 ⁇ speed to the decoding unit 104.
- the decoding unit 104 decodes the video stream data into video data in units of frames according to the control command transmitted from the playback speed determination unit 110, and plays back the decoded frame image so as to have the designated playback speed.
- the reproduced video data is output to the synthesis unit 106.
- 60 frames per second may be output without performing processing such as thinning out or repeatedly outputting decoded frame images. That is, in this case, the video frame rate matches the playback frame rate, and the playback speed is 1 ⁇ , so that processing such as frame decimation and interpolation is not necessary.
- the decoding unit 104 extracts 60 frames from 480 frames per second and outputs the 60 frames to the combining unit 106. Therefore, in order to reproduce 480 fps video data at a speed equal to the speed in real time, all the frames are reproduced at 8 times the speed compared with the case of displaying at 60 Hz.
- 60 frames can be extracted at regular intervals from 480 frames by simply extracting one frame every 7 frames. However, if such a simple method is used, motion information for seven frames existing between the extracted frames is lost, and the video is displayed like frame advance. Therefore, the decoding unit 104 may generate 60 frames by interpolating from 480 frames so that motion information is not lost. As a generation method in this case, various techniques relating to frame generation in which motion information is stored can be used.
- the slow reproduction process in the present invention includes not only a process that proceeds in the reproduction direction (forward direction) but also a process that proceeds in the rewind direction (reverse direction).
- the slow reproduction has two choices of ON or OFF, and when the slow reproduction is turned off, the reproduction is performed at a speed equal to the real time.
- the selection of ON / OFF of slow playback is performed by pressing the slow playback button on the remote control. That is, when the slow playback button is pressed during slow playback, control for turning off slow playback is executed.
- the video content being played back is H. It is assumed that the data is encoded according to the H.264 / SVC standard, and the video data includes video data of two frame rates of 480 fps and 30 fps.
- FIG. 2 is a flowchart showing control during video content playback processing.
- step S201 the user selects video content stored in the storage unit 101, and inputs an instruction to play the selected video content to the remote control, so that the control unit 108 receives the remote control signal reception unit 109.
- the output video playback instruction is received.
- the control unit 108 recognizes that the playback button on the remote controller has been pressed.
- the video frame rate in the video content instructed to be reproduced is determined.
- the video content is H.264.
- the frame rate of the video content itself is the video frame rate. For example, if the frame rate of the video content is only 60 fps, the video frame rate is naturally 60 fps.
- H. In the case of H.264 / SVC video content, since video data of a plurality of frame rates is encoded, it is necessary to select a video frame rate to be decoded. Various methods are conceivable for selecting the video frame rate.
- the video frame rate to be decoded is determined using a method for allowing the user to select the video frame rate.
- the frame rate of the video content is determined by the frame rate detection unit 111 according to H.264. It can be acquired by referring to the header information of the H.264 / SVC video data.
- the control unit 108 generates a UI for selecting a frame rate using the frame rate information, and displays the UI on the display panel via the synthesis unit 106. The user selects a video frame rate to be decoded via the displayed UI.
- step S203 based on the value of the video frame rate, the playback speed determination unit 110 determines a playback speed that is equal to the real time. As described above, on a 60 Hz display panel, if the video frame rate to be decoded is video content of 60 fps, the playback speed that is equal to the real time is 1 ⁇ speed. On the other hand, in the case of video content of 480 fps, the playback speed that is equal to the real time is 8 ⁇ speed.
- step S204 the playback speed determination unit 110 notifies the decoding unit 104 of the determined playback speed.
- the decoding unit 104 configures the frame image obtained by decoding the video stream data so as to achieve the instructed playback speed so that the frame image becomes 60 fps corresponding to the refresh rate of the display panel. Output.
- step S205 the control unit 108 determines whether an instruction for slow playback is input from the user during video playback at a speed equal to the real time. If it is determined that an instruction for slow playback has been input (Yes in step S206), the control unit 108 notifies the playback speed determination unit 110 of that fact.
- step S206 the playback speed determination unit 110 refers to playback speed information at the time of slow playback determined in advance according to the value of the video frame rate, and performs a process of determining a playback speed corresponding to the value of the corresponding frame rate. Do.
- FIG. 3 is a diagram showing an outline of reproduction speed information.
- the reproduction speed information is information stored in a storage unit (not shown).
- the playback speed information is associated with a plurality of types of slow playback speeds corresponding to each of a plurality of video frame rate values assumed to be able to be played back by the video playback apparatus. ing.
- This reproduction speed indicates a speed magnification with respect to the case where the speed equal to the real time is set to 1 ⁇ speed.
- the playback speed determination unit 110 uses the frame rate value of the video currently being played back and the playback speed information at the time of slow playback stored in the storage unit for slow playback of the currently played video. Determine the playback speed.
- the reason why the playback speed during slow playback is varied according to the difference in the video frame rate to be decoded is because of the following reasons.
- a video with a high video frame rate for example, video data of 480 fps has a larger number of frames per unit time than a video with a low video frame rate, for example, video data of 30 fps. Therefore, when performing slow playback, it can be said that a video with a high frame rate is more suitable for playback at a lower speed. This is because a video having a larger number of frames per unit time has frames at finer intervals, and even when played back at a low speed, a video between the frames can be reproduced smoothly.
- the slower and smoother slow playback allows the user to view a video showing a moment that cannot be viewed with slow playback at a general speed.
- the advantage that the video being played back has a high frame rate cannot be fully utilized.
- the playback speed determination unit 110 transmits a control command for instructing the decoding unit to perform playback at 1/2 times speed. That is, since 60 frames are reproduced in 2 seconds, one frame is repeatedly displayed twice.
- the playback speed determination unit 110 transmits a control command instructing the decoding unit to play back at 1/16 times the real time. .
- a video having a frame rate of 480 fps is played back at a speed that is equal to the real time at 8 times speed, if it is played back at a speed of 1/16 times the real time, it should be played back at a speed of 1/2 times means. That is, it corresponds to displaying 480 frames per second in 16 seconds, and one frame is displayed twice.
- step S207 output frame selection and interpolation of the currently reproduced video data, and output timing adjustment processing are performed so that the decoding unit 104 has the reproduction speed notified by the control command transmitted from the reproduction speed determination unit 110. Execute. As a result, it is possible to adaptively provide the user with slow playback video corresponding to the video frame rate.
- step S208 the control unit 108 determines whether or not an instruction for stopping the slow playback is input via the remote controller. If the control unit 108 determines that an instruction to stop the slow playback has been input, the process proceeds to step S204, and the decoding unit so that the playback speed determination unit 110 switches to playback at the playback speed determined in step S203. A control command is issued to 104.
- step S209 the control unit 108 determines whether an instruction for stopping video playback is input during slow playback or playback at a speed equal to real time.
- the control unit 108 instructs each functional unit such as the read control unit 102 and the decoding unit 104 to stop video playback. Control is performed so that no video is displayed on the display panel.
- the slow playback speed is adaptively set according to the frame rate of the video content being played back, and the slow playback suitable for the video content becomes possible.
- a suitable slow playback speed is determined in advance according to the video frame rate of the video data, and the slow playback speed is set according to the value of the video frame rate of the video being played back when executing slow playback. And slow playback.
- the present embodiment is characterized in that when performing slow playback of video data in which a plurality of video frame rates can be freely selected, video data having a video frame rate suitable for slow playback is selected and slow playback is performed.
- video data for which a plurality of video frame rates can be freely selected H.264 is used.
- An example is video data encoded by the H.264 / SVC standard, but the present embodiment is not limited thereto.
- a mode in which two independent video streams having different frame rates are switched and the playback positions are synchronized and played back may be employed.
- the video playback device of the second embodiment is a device that can play back video data of any one video frame rate from a plurality of video data having the same contents and different video frame rate values.
- the configuration of the video playback apparatus in the second embodiment is the same as the configuration of the video playback apparatus of the first embodiment shown in FIG.
- FIG. 4 is a flowchart showing the control during video content playback processing in the second embodiment.
- steps S401 to S405 are the same controls as steps S201 to S205 in the flowchart of FIG. 2 in the first embodiment described above, description thereof will be omitted.
- step S406 the frame rate detector 111 detects the highest video frame rate value in the video content being reproduced.
- frame rate information since frame rate information is detected in step S402, it is preferable to store the detection result at that time and use the information in step S406.
- FIG. It is the figure which showed the data structure of H.264 / SVC.
- H. H.264 / SVC video data is composed of units called sequences.
- the sequence is composed of SPS (sequence parameter set) and AU (access unit).
- SPS is a header in which information related to sequence encoding is described.
- AU is data obtained by encoding the video itself.
- H.264 / SVC it is possible to arrange a plurality of SPSs for one sequence as a mechanism for encoding a video of a plurality of layers. That is, when decoding is performed using SPS in which low frame rate information is described, it is possible to decode the video with the first frame rate having a low frame rate. On the other hand, when the AU is decoded using the SPS in which the high frame rate information is described, it can be decoded as a video with the second frame rate having a high frame rate.
- the frame rate detection unit 111 detects the value of the highest frame rate in the plurality of SPS frame rate information. In the case of FIG. 5, 480 fps is detected. This is processing to detect video data having a video frame rate more suitable for slow playback processing as video data for executing slow playback processing.
- the value of the video frame rate detected by the frame rate detection unit 111 in step S406 is notified to the playback speed determination unit 110.
- step S407 the playback speed determination unit 110 determines the slow playback speed using the highest frame rate value. This determination process is executed by referring to the reproduction speed information in the first embodiment. For example, since the highest frame rate is 480 fps, it is determined that the slow playback speed is 1/16 times faster.
- step S408 the playback speed determination unit 110 determines whether the video currently being played back is obtained by decoding the video having the highest frame rate detected in step S406. Since the video frame rate information of the video currently being played back is obtained when the playback speed is determined in step S403, the information is used in step S408 by storing the information in the storage unit. can do.
- step S410 If the playback speed determination unit 110 determines that the frame rate of the video currently being played is equal to the maximum frame rate, the process proceeds to step S410. If the playback speed determination unit 110 determines that it is not equal to the maximum frame rate, the process proceeds to step S409.
- step S409 the playback speed determination unit 110 instructs the decoding unit 104 to set the video frame rate to be decoded to the maximum frame rate. Specifically, the playback speed determination unit 110 outputs a command for instructing to decode AU using SPS of 480 fps to the decoding unit 104.
- step S410 the decoding unit 104 selects the output frame of the currently reproduced video data, performs interpolation, and adjusts the output timing in order to obtain the reproduction speed notified by the control command transmitted from the reproduction speed determination unit 110. Execute. This makes it possible to provide the user with slow playback video corresponding to each frame rate.
- a control command that indicates the slow playback speed determined in step S407 is transmitted from the playback speed determination unit 110 to the decoding unit 104.
- This command includes an instruction to reproduce at 1/16 times the real time.
- the decoding unit 104 decodes the video data so that the frame rate becomes 480 fps, and performs a process of reproducing at the reproduction frame rate of 60 fps in order to reproduce the decoded video data at 1/16 times speed. Execute. Since the method for achieving 1/16 ⁇ speed is as described in the first embodiment, the description thereof is omitted in this embodiment.
- Steps S411 to S413 are the same processes as Steps S208 to S210 described in the first embodiment, description thereof will be omitted.
- step S414 when the control unit 108 receives an instruction to stop the slow playback in step S411, the decoding is performed so as to change to the video frame rate determined in step S402 when returning to the playback at the speed equal to the real time. This is processing to notify the unit 104. If the video frame rate is the highest frame rate before the slow playback, the video frame rate determined in step S402 is also the highest frame rate, and therefore the process of step S414 need not be executed. After the process of step S414, the process proceeds to step S403.
- an arbitrary video frame rate can be selected from a plurality of video frame rates and video playback can be performed
- a video frame rate suitable for slow playback is selected, and Slow playback is possible at a playback speed suitable for the video frame rate.
- the slow playback process is executed using the video data having the highest video frame rate value, but it is faster than the frame rate value of the video data being played back at a speed equal to the real time.
- Video data having a high frame rate value may be used. This means that if the video data has a higher frame rate than the video data being played back at the same speed as the real time, the higher the frame rate value is smoother when the slow playback is performed at the same slow playback speed. This is because it is possible to perform slow playback.
- the frame rate detection unit 111 detects the value of the frame rate from the video data.
- the frame rate detection unit 111 may detect it from metadata about the video.
- the frame rate value may be detected from the section data multiplexed in MPEG2 TS.
- the separation unit 103 separates section data such as PSI / SI from the MPEG2 TS and outputs it to the frame rate detection unit 111.
- the frame rate detection unit 111 may analyze the input section data and detect the frame rate value.
- the slow playback speed is determined by referring to predetermined playback speed information, but may be a process obtained by calculation from the frame rate value.
- the slow playback speed can be determined by dividing a predetermined value by the acquired value of the video frame rate.
- one slow playback speed is set according to the video frame rate.
- FIG. 6 shows playback speed information that defines a slow playback speed, which is predetermined according to each video frame rate.
- a plurality of slow playback speeds are defined as compared to the playback speed information shown in FIG.
- an initial slow playback speed set as a default slow playback speed when the execution of slow playback is started from a state where playback is performed at a speed equal to the real time is separately defined.
- the slow playback speed that the playback speed determining unit 110 first instructs the decoding unit 104 is 1/16 times the real time.
- the user performs a predetermined operation via the remote controller, so that other slow playback speeds (1/2 ⁇ , (4 ⁇ speed, 1/8 ⁇ speed, 1/24 ⁇ speed) can be selected.
- the selection of the slow playback speed can be realized by sequentially switching the slow playback speed to the low speed direction or the high speed direction when the user presses the slow playback button on the remote controller.
- the slow playback button is pressed again after 1/2 speed has been selected, the slow playback speed desired by the user can be achieved with a simple operation by switching to perform slow playback at 1/24 speed. You can choose.
- FIG. 7 is a flowchart showing the slow playback speed switching control in the third embodiment. This flowchart corresponds to the internal processing executed in step S207 of the flowchart of the first embodiment shown in FIG. 2 and step S410 of the flowchart of the second embodiment shown in FIG.
- step S206 or step S407 the initial slow playback speed at the determined video frame rate is selected and the slow playback is executed.
- the video frame rate of the video being played back is 60 fps
- slow playback is performed at 1 ⁇ 2 times speed.
- the maximum frame rate is 480 fps
- slow playback is performed at 1/16 ⁇ speed.
- step S701 the control unit 108 determines whether or not the user inputs an instruction to change the slow playback speed via the remote controller in accordance with a notification from the remote control signal receiving unit 109 that receives the remote control signal.
- the control unit 108 determines that an instruction to change the slow playback speed has been received, the control unit 108 notifies the playback speed determination unit 110 of the information.
- step S702 the playback speed determination unit 110 refers to the playback speed information shown in FIG. 6 stored in the storage unit for the video frame rate of the video for which slow playback is being executed.
- step S703 the playback speed determination unit 110 sets another slow playback speed different from the playback speed of the current slow playback for the video frame rate of the video for which slow playback is being executed, based on the referenced playback speed information. It is determined whether or not. As a result of the determination in step S703, if it is determined that no other slow playback speed exists, the process proceeds to step S706.
- the playback speed determination unit 110 notifies the control unit 108 of information for instructing to synthesize a UI indicating that the slow playback speed cannot be changed. Upon receiving the information, the control unit 108 generates a UI indicating that the slow playback speed cannot be changed, and outputs the UI to the synthesis unit 106.
- the combining unit 106 combines the UI generated by the control unit 108 with the video input to the combining unit 106.
- step S703 when the playback speed determination unit 110 determines that another slow playback speed different from the playback speed of the current slow playback is set, the process proceeds to step S704.
- step S704 the playback speed determination unit 110 selects a slow playback speed to be selected next to the current slow playback speed in accordance with the selection order of the slow playback speed defined in the playback speed information.
- This selection order information is not shown in the reproduction speed information of FIG. 6, but it is preferable that the selection order is such that the slow reproduction speed is increased. Accordingly, when the currently selected slow playback speed is 1/16 times speed at a video frame rate of 480 fps, the slow playback speed to be selected next to this playback speed is 1/8 times speed.
- step S705 the playback speed determination unit 110 transmits a control command to the decoding unit 104 so that the video data is played back at the slow playback speed determined in step S704.
- a plurality of slow playback speeds suitable for the video frame rate are set according to the value of the video frame rate, and the user can arbitrarily select the slow playback speed.
- a video playback device with improved convenience can be provided.
- the initial slow playback speed applied when shifting to slow playback is set as the slow playback speed suitable for the video frame rate. Accordingly, it is possible to present to the user a slow motion video having a slow playback speed suitable for the frame rate without changing the slow playback speed many times.
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Abstract
Description
本発明の第1の実施例について説明する。本実施例の映像再生装置は、リフレッシュレートが60Hzの表示パネルで表示する映像を再生する装置である。具体的には、映像の記録再生部を備えたテレビとして説明を行う。もちろん、本発明の映像再生装置は、表示パネルと別体の構成を有する放送レコーダであっても良い。
続いて、上述した映像再生装置100を用いて、映像データを再生する際の動作について説明を行う。
続いて、本発明の特徴的な処理である、スロー再生処理時の制御について説明を行う。なお、本発明におけるスロー再生処理とは、再生方向(順方向)に進行するものだけでなく、巻き戻し方向(逆方向)に進行するものも含むものとする。また、本実施例では、スロー再生はONまたはOFFの2択であり、スロー再生をOFFにした場合は実時間と等しい速度で再生が行われるものとする。スロー再生のON/OFFの選択は、リモコンのスロー再生ボタンを押下することで行われる。つまり、スロー再生中にスロー再生ボタンが押下されると、スロー再生をOFFにする制御が実行される。
Claims (10)
- 蓄積部に蓄積された映像データのスロー再生処理が可能な映像再生装置であって、
映像データのフレームレートの値を検出する検出手段と、
前記検出手段で検出されたフレームレートの値から、当該フレームレートの映像データをスロー再生する場合のスロー再生速度を決定する決定手段と、
前記決定手段で決定されたスロー再生速度を用いて、前記映像データのスロー再生処理を実行する再生手段と、
を有することを特徴とする映像再生装置。 - 前記映像再生装置は、実時間における速度と等しい速度で映像データを再生すること、及び、同一内容かつ映像フレームレートの値が異なる複数の映像データから、いずれか一つの映像フレームレートの映像データを選択して再生することが可能であり、
前記検出手段は、スロー再生処理の実行にあたって、実時間における速度と等しい速度で再生している映像データのフレームレートの値よりも、当該映像データと同一内容の映像データであって、より高いフレームレートの値を有する映像データが存在するか否かを検出し、
前記決定手段は、前記検出手段によってより高いフレームレートを有する映像データが存在することが検出された場合、当該映像データのフレームレートの値から、当該映像データをスロー再生する場合のスロー再生速度を決定し、
前記再生手段は、前記決定手段で決定されたスロー再生速度を用いて、より高いフレームレートを有する前記映像データのスロー再生処理を実行することを特徴とする請求項1に記載の映像再生装置。 - 前記決定手段は、映像データのフレームレートが取り得る複数の値の各々に、当該フレームレートの映像データをスロー再生する場合に適したスロー再生速度を少なくとも一つ対応付けた再生速度情報を用いて、スロー再生処理を実行する前記映像データのスロー再生速度を決定することを特徴とする請求項1または2に記載の映像再生装置。
- 前記再生速度情報における、映像データのフレームレートが取り得る値に対して複数のスロー再生速度が対応付けられている場合、当該複数のスロー再生速度は、対応付けられているフレームレートの映像データのスロー再生時に、ユーザの指示入力に従って選択可能なスロー再生速度であることを特徴とする請求項3に記載の映像再生装置。
- 蓄積部に蓄積された映像データのスロー再生処理が可能な映像再生装置の制御方法であって、
映像データのフレームレートの値を検出する検出ステップと、
前記検出ステップで検出されたフレームレートの値から、当該フレームレートの映像データをスロー再生する場合のスロー再生速度を決定する決定ステップと、
前記決定ステップで決定されたスロー再生速度を用いて、前記映像データのスロー再生処理を実行する再生ステップと、
を有することを特徴とする映像再生装置の制御方法。 - 前記映像再生装置は、実時間における速度と等しい速度で映像データを再生すること、及び、同一内容かつ映像フレームレートの値が異なる複数の映像データから、いずれか一つの映像フレームレートの映像データを選択して再生することが可能であり、
前記検出ステップでは、スロー再生処理の実行にあたって、実時間における速度と等しい速度で再生している映像データのフレームレートの値よりも、当該映像データと同一内容の映像データであって、より高いフレームレートの値を有する映像データが存在するか否かを検出し、
前記決定ステップでは、前記検出ステップによってより高いフレームレートを有する映像データが存在することが検出された場合、当該映像データのフレームレートの値から、当該映像データをスロー再生する場合のスロー再生速度を決定し、
前記再生ステップでは、前記決定ステップで決定されたスロー再生速度を用いて、より高いフレームレートを有する前記映像データのスロー再生処理を実行することを特徴とする請求項5に記載の映像再生装置の制御方法。 - 前記決定ステップでは、映像データのフレームレートが取り得る複数の値の各々に、当該フレームレートの映像データをスロー再生する場合に適したスロー再生速度を少なくとも一つ対応付けた再生速度情報を用いて、スロー再生処理を実行する前記映像データのスロー再生速度を決定することを特徴とする請求項5または6に記載の映像再生装置の制御方法。
- 前記再生速度情報における、映像データのフレームレートが取り得る値に対して複数のスロー再生速度が対応付けられている場合、当該複数のスロー再生速度は、対応付けられているフレームレートの映像データのスロー再生時に、ユーザの指示入力に従って選択可能なスロー再生速度であることを特徴とする請求項7に記載の映像再生装置の制御方法。
- 映像データを再生することが可能な映像再生装置であって、
映像データが有するフレームレートの種別に応じて夫々決定されたスロー再生速度を用いてスロー再生が可能な再生手段を有し、
前記スロー再生速度は、第1のフレームレートに対応するスロー再生速度よりも、前記第1のフレームレートよりも高い第2のフレームレートに対応するスロー再生速度の方がより低速でのスロー再生が可能となるように決定されていることを特徴とする映像再生装置。 - 映像データを再生することが可能な映像再生装置の制御方法であって、
映像データが有するフレームレートの種別に応じて夫々決定されたスロー再生速度を用いてスロー再生が可能な再生ステップを有し、
前記スロー再生速度は、第1のフレームレートに対応するスロー再生速度よりも、前記第1のフレームレートよりも高い第2のフレームレートに対応するスロー再生速度の方がより低速でのスロー再生が可能となるように決定されていることを特徴とする映像再生装置の制御方法。
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