WO2005041582A1 - 動画像符号化装置および動画像符号化制御方法 - Google Patents
動画像符号化装置および動画像符号化制御方法 Download PDFInfo
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- WO2005041582A1 WO2005041582A1 PCT/JP2004/016472 JP2004016472W WO2005041582A1 WO 2005041582 A1 WO2005041582 A1 WO 2005041582A1 JP 2004016472 W JP2004016472 W JP 2004016472W WO 2005041582 A1 WO2005041582 A1 WO 2005041582A1
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Definitions
- the present invention relates to a moving picture coding apparatus for coding a moving picture signal, and more particularly to a moving picture coding apparatus for controlling a generated code amount of a subsequent chapter when performing seamless connection between the chapters, and a moving picture coding control.
- the present invention relates to an apparatus, a moving image encoding control method, and a program for causing a computer to execute the method. Background art
- optical disks have attracted attention as recording media capable of recording moving image (video) data and audio (audio) data.
- This optical disc is used not only as a medium for content products such as movies, but also as a writable medium for recording on the user side.
- the write-once media for example, the DVD-R standard, which enables recording only once in the same area, and the DVD-RW standard, which can be repeatedly rewritten, are known.
- the DVD-Video standard for read-only discs is known, but it is also possible to perform writing in accordance with the DV-Video standard on writable media. You can do it.
- the DVD-Video standard allows up to 99 titles per disc, and each title can contain up to 99 chapters (PTT: Part of TiTle). You can do it.
- a DVD-R or DVD-RW with a camcorder (camera and recorder)
- one recording unit from the start of recording to the end of recording is recorded as a cap, and a predetermined time is recorded. Recorded as the same title until the condition is met.
- Predetermined conditions for closing the title are, for example, when a disc is ejected, when it reaches 9.9 cells in the title, or when it reaches 99 cells in the title. This is the case when moving from video recording to still image recording.
- VBV Video Buffering Verifier: see IS013818-2 Annex C
- Encoding must be performed so that the VBV buffer does not break down.
- VBV buffer fails because the data of the succeeding capture is input to the VBV buffer without considering the occupancy of the preceding capture in the VBV buffer. May be caused.
- an object of the present invention is to provide a moving picture encoding apparatus that performs seamless connection during a captive time without causing a failure in a VBV buffer. Disclosure of the invention
- a moving picture coding apparatus (1) encodes a moving picture signal, and generates a virtual buffer defined by a generated code amount and a transferred code amount to an output destination.
- a video encoding device that controls the encoding in accordance with the occupancy of the video signal, and determines whether seamless connection is possible between a preceding capture and a subsequent capture included in the video signal, Recording mode determining means for setting an initial value of the occupancy of the virtual buffer according to the determination result; occupancy updating means for updating the occupancy of the virtual buffer each time the encoding is performed;
- An optimal occupancy calculating means for calculating a predetermined optimal occupancy based on the updated occupancy of the virtual buffer; and a target code amount calculating for calculating a predetermined target code amount based on the video signal of the subsequent capture.
- a target code amount adjusting unit that adjusts the target code amount so that the total amount does not exceed the optimal occupancy amount, and an encoding unit that performs the encoding according to the adjusted target code amount.
- the moving picture signal of the subsequent chapter is possible. Is the initial value of the virtual buffer occupancy immediately before being transferred to the virtual buffer. If the seamless connection is not possible, zero is set as the initial value of the virtual buffer occupancy. That is. As a result, when setting the initial value of the occupancy of the virtual buffer for the succeeding capture, the effect that the state of the occupancy of the virtual buffer by the preceding capture is inherited is brought about.
- the moving picture coding apparatus in the moving picture coding apparatus according to the present invention (3), in the moving picture coding apparatus according to the above (2), when the occupancy updating means is configured such that the occupancy is larger than the transfer code, A value obtained by subtracting the transfer code amount from the occupation amount and adding the generated code amount and not exceeding the maximum value of the virtual buffer as a new occupancy amount, and when the occupation amount is equal to or less than the transfer code amount , The generated code amount is used as a new occupation amount. This has the effect of updating the information on the virtual buffer occupancy to the latest state.
- the moving picture coding apparatus of the present invention (4) provides the moving picture coding apparatus of the above (2).
- the optimum occupancy calculating means calculates a value which is larger or equal to the larger the occupancy of the updated virtual buffer as the optimum occupancy. This has the effect of reflecting the occupancy of the virtual buffer in the bit rate and suppressing sharp image degradation.
- the moving picture coding control device of the present invention (5) is characterized in that the above coding is performed according to the occupation amount of a virtual buffer defined by the generated code amount and the transfer code amount to the output destination in the coding of the moving image signal.
- a video encoding control device that controls whether or not a seamless connection is possible between a preceding chapter and a following chapter included in the video signal, and, based on the determination result, the virtual buffer Recording mode discriminating means for setting an initial value of the occupancy of the virtual buffer, occupancy updating means for updating the occupancy of the virtual buffer each time the encoding is performed, and based on the occupancy of the updated virtual buffer.
- Optimum occupancy calculating means for calculating a predetermined optimum occupancy; target code amount calculating means for calculating a predetermined target code amount based on the video signal of the subsequent chapter; occupancy of the virtual buffer
- Target code amount adjusting means for adjusting the target code amount so that the total amount obtained by adding the target code amount to the optimal occupancy does not exceed the optimum occupancy amount and providing the target code amount.
- the recording mode discriminating means is capable of the above seamless connection, Evening video signal
- the occupancy of the virtual buffer immediately before the signal is transferred to the virtual buffer is used as the initial value of the occupancy of the virtual buffer. If the seamless connection is not possible, zero is set as the initial value of the occupancy of the virtual buffer. It is a term value.
- the moving picture coding control method according to (7) of the present invention is characterized in that the moving picture coding control method according to the occupation amount of the virtual buffer defined by the generated code amount and the transfer code amount to the output destination in the coding of the moving image signal.
- a video encoding control method for controlling the encoding by a method comprising: determining whether seamless connection is possible between a preceding capture and a subsequent capture included in the video signal; and A procedure for setting an initial value of the occupancy of the virtual buffer according to the result; a procedure for updating the occupancy of the virtual buffer each time the encoding is performed; and an occupancy of the updated virtual buffer.
- Calculating a predetermined optimum occupancy based on the following: a procedure for calculating a predetermined target code amount based on the video signal of the subsequent capture; and adding the target code amount to the virtual buffer occupancy. Total amount is above optimal Adjust the target amount of code so as not to exceed the amount; and a procedure to be subjected to the encoding.
- the target code amount is calculated based on the occupation amount, and the encoding is controlled. This has the effect of making it possible to seamlessly connect the devices.
- the moving picture coding control method of the present invention (8) is characterized in that the amount of generated codes in coding moving picture signals and the amount of transferred codes to an output destination are regulated.
- the program according to the present invention (9) is characterized in that the above-described encoding is performed in accordance with the occupation amount of the virtual buffer defined by the generated code amount and the transfer code amount to the output destination in the encoding of the moving image signal.
- the program according to the present invention (10) performs the above-mentioned encoding in accordance with the occupation amount of a virtual buffer defined by the generated code amount and the transfer code amount to an output destination in encoding of a moving image signal.
- a program to be controlled a procedure for determining whether a seamless connection is possible between a preceding chapter and a subsequent chapter included in the video signal, and the result of the determination indicates that the seamless connection is possible.
- the occupation amount of the virtual buffer immediately before the video signal of the subsequent capture is transferred to the virtual buffer is set as the initial value of the occupation amount of the virtual buffer, and the seamless connection is determined to be impossible.
- a procedure for setting zero as an initial value of the occupancy of the virtual buffer a procedure for updating the occupancy of the virtual buffer every time the encoding is performed, and Calculating a predetermined optimal occupancy based on the occupancy of the buffer; calculating a predetermined target code based on the video signal of the subsequent capture; And adjusting the target code amount so that the total amount including the code amount does not exceed the optimum occupancy amount and providing the target code amount for the encoding.
- FIG. 1 is a diagram showing a configuration example of a video encoding device according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration example of the video encoder 100 according to the embodiment of the present invention.
- 3A to 3B are diagrams showing a model of a VBV buffer in the MPEG-2 standard.
- FIG. 4 is a diagram showing a transition example of the occupation amount of the encoder-side VBV buffer 701.
- FIG. 5A to 5B are diagrams showing transition examples of the occupancy of the decoder-side VBV buffer 709.
- FIG. 5A to 5B are diagrams showing transition examples of the occupancy of the decoder-side VBV buffer 709.
- FIG. 6 is a diagram showing a functional configuration example of the processor 510 of the encoding control unit 500 in the embodiment of the present invention.
- FIG. 7 is a diagram showing an example of the function VBV in the present invention.
- FIG. 8 is a flowchart showing a processing example of the moving picture coding apparatus according to the embodiment of the present invention.
- FIG. 9 is a flowchart showing a processing example of control on the VBV buffer according to the embodiment of the present invention.
- FIG. 10 shows the occupancy of the VBV buffer in the embodiment of the present invention. It is a flowchart which shows the example of a process of the update of the information regarding weight.
- FIG. 1 is a diagram showing a configuration example of a video encoding device according to an embodiment of the present invention.
- This video encoding apparatus includes a video encoder 100 for encoding a video signal, a video encoder 200 for encoding an audio signal, a video encoder 100 and a video encoder.
- an encoding control unit 5 0 0 that controls the encoding in 0.
- the encoding control unit 550 includes a processor 510, a ROM 520, a RAM 530, an input / output interface 540, and a bus 550 for interconnecting these components. 0.
- the processor 510 receives the generated code amount, which is the data amount encoded by the video encoder 100, via the signal line 179, and obtains the target data amount for encoding the next picture by using the target data amount. A quantization index that matches a certain target code amount is determined and output via signal line 159.
- the ROM 520 is a memory that stores programs executed by the processor 510 and various parameters, and is realized by an EPROM such as a flash memory.
- the RAM is a memory that holds work data and the like necessary for executing a program in the processor 510, and is realized by, for example, an SRAM or a DRAM.
- Enter The output interface 540 exchanges data with the outside, and is used, for example, for updating a program in the ROM 520.
- FIG. 2 is a diagram showing a configuration example of the video encoder 100 in the embodiment of the present invention.
- the video encoder 1000 encodes a moving image signal input via a signal line 101 and outputs the encoded video signal via a signal line 199.
- Conversion circuit 1 1 motion detection circuit 1 2 1, motion compensation circuit 1 2 2, subtracter 1 3 1, adder 1 3 2, DCT circuit 1 4 1, and inverse DCT circuit 1 4 2 ,
- the reordering circuit 111 reorders the pictures of the moving image signal input via the signal line 101 in accordance with the encoding order, and supplies the reordered pictures to the scan conversion circuit 112.
- the scan conversion circuit 112 determines whether the supplied picture data has a frame structure or a field structure, and performs a scan conversion process on the supplied picture data in accordance with the determination result. After that, it is converted into macroblock data and output to the motion detection circuit 121 and the subtractor 131, respectively.
- the motion detection circuit 122 detects a motion vector based on the output data of the scan conversion circuit 112 and supplies the motion vector to the motion compensation circuit 122. Based on the motion vector supplied from the motion detecting circuit 122, the motion compensating circuit 122, among the image data stored in advance in the motion compensating circuit 122, sends a signal to the subtracter 133. The image data corresponding to the supplied macroblock data is read out and supplied to the subtractor 13 1 and the adder 13 2 as predicted image data. If the macroblock data supplied from the scan conversion circuit 112 is an I-picture, the subtracter 134 supplies the data directly to the DCT circuit 141, and if the macroblock data is a P-picture or a B-picture, the macroblock data is supplied. The data obtained by subtracting the predicted image data supplied from the motion compensation circuit 122 from the motion compensation circuit 122 are supplied to the DCT circuit 141.
- the DCT circuit 141 performs DCT (Discrete Consign Transform) processing on the data supplied from the subtracter 131, and converts the data into DCT coefficients.
- the quantization circuit 151 quantizes the DCT coefficient from the DCT circuit 141 based on the quantization index supplied from the coding control unit 500 via the signal line 159, and performs coding.
- the encoder 16 1 performs variable-length coding on the quantized data and stores it in the buffer memory 17 1.
- the buffer memory 171 converts the stored variable-length code into data in picture units, and outputs the data to the signal line 199 as a bit stream.
- the generation amount of the variable length code of the entire picture is supplied as a generated code amount to the encoding control unit 500 via the signal line 179.
- the inverse quantization circuit 152 inversely quantizes the quantized data supplied from the quantization circuit 151.
- the inverse DCT circuit 142 performs an inverse DCT process on the data that has been inversely quantized by the inverse quantization circuit 152 and supplies the resultant data to the adder 132.
- the adder 132 adds the data supplied from the inverse DCT circuit 142 to the predicted image data supplied from the motion compensation circuit 122 to return to the original image data. This is supplied to the motion compensation circuit 122 in order to generate predicted image data corresponding to the image data of the macroblock to be encoded.
- FIGS. 3A to 3B are diagrams showing a model of a VBV buffer in the MPEG-2 standard.
- the VBV buffer overflows assuming a virtual buffer called a VBV buffer between the encoder and the decoder in order to properly transmit and decode the resulting bitstream data. Encode so that it does not.
- the difference between the amount of code generated by the encoder and the amount of code transferred to the output destination is the amount of data (referred to as “occupancy”) existing in the VBV buffer.
- occupancy the amount of data (referred to as “occupancy”) existing in the VBV buffer.
- the maximum size of this VBV buffer is defined as 224 KB. However, this VBV buffer is only virtual, and such a buffer does not always exist.
- the VBV buffer 701 When the VBV buffer is viewed from the encoder side, as shown in Fig. 3A, the VBV buffer 701 is connected to the output side of the video encoder 100, and the data from the video encoder 100 to the VBV buffer 701 is transferred.
- the transfer is theoretically instantaneous.
- the output from the VBV buffer 701 is at the transfer rate Rmax when there is data in the VBV buffer 701, and at the transfer rate 0 when there is no data in the VBV buffer 701. It shall be performed.
- the occupation amount of the VBV buffer 701 is grasped, and the operation of the video encoder 100 is controlled so that the occupation amount does not exceed the maximum amount of the VBV buffer 701 (so as not to overflow).
- the VBV buffer 709 is connected to the input side of the video decoder 900 as shown in FIG. 3B, and the data from the VBV buffer 709 to the video decoder 900 is Transfer is theoretically instantaneous.
- FIG. 4 is a diagram showing a transition example of the occupation amount of the encoder-side VBV buffer 701.
- the vertical axis represents the occupancy of the VBV buffer, and the horizontal axis represents time.
- the occupancy on the vertical axis is displayed in the downward direction, meaning that the occupancy increases as going downward.
- the maximum amount of the VBV buffer 701 is 224 KB.
- T represents the picture generation period, that is, the reciprocal of the frame rate.
- N is an integer indicating the picture number of an arbitrary picture.
- PX is the actual code generation amount of the Xth picture, and BX represents the occupancy of the VBV buffer immediately before the Xth picture is coded.
- the video encoder 100 encodes the input moving image signal in the order of the picture numbers. Immediately after the 0th picture is encoded (time 0), the generated code amount P0 is instantaneously transferred to the VBV buffer 701, and the occupation amount of the VBV buffer becomes B0 + P0. Then, until the encoding of the next first picture is completed, the code is transmitted from the VBV buffer 701 at the transfer rate Rmax, and the occupancy of the VBV buffer 701 is reduced. It decreases with time.
- the occupation amount of the VBV buffer 70 1 becomes B 1, and the first picture of the generated code amount P 1 is instantly transferred there.
- the occupancy of the VBV buffer 70 1 becomes B 1 + P 1.
- transfer from the VBV buffer 701 and storage of the coded picture code in the VBV buffer 701 continue immediately before the n-th picture is coded (time n XT).
- the occupation amount of the VBV buffer 70 1 becomes 8 11 + ⁇ .
- the occupation amount of the V ⁇ V buffer 701 becomes 0 as shown at time ⁇ ⁇ , and the data from the V ⁇ V buffer 701 becomes zero. Overnight transmission is not performed.
- the V ⁇ ⁇ ⁇ V buffer 701 generates an underflow on the encoder side.
- overflow of the VBV buffer 701 is not allowed. Therefore, it is necessary to control the video encoder 100 so that the V ⁇ V buffer 701 does not overbuff.
- FIG. 5 to 5 are diagrams showing transition examples of the occupancy of the decoder-side VBV buffer 709.
- the vertical axis represents the occupancy of the VBV buffer, and the horizontal axis represents time. Unlike Fig. 4, the occupancy on the vertical axis is displayed upward, meaning that the occupancy increases as it goes upward.
- This V ⁇ V buffer 709 stores the code at the transfer rate R max in a state where the video stream exists in the bit stream. No storage is performed if no video stream exists during the bitstream.
- the outflow from the VBV buffer 709 to the video decoder 900 is instantaneously performed at the start of decoding of each picture.
- the code of the following capture flows in before the occupancy of the VBV buffer 709 by the previous chapter becomes zero. Therefore, it is necessary to calculate the initial value of the VBV buffer 709 by taking over the occupation amount of the VBV buffer 709 by the preceding capture. If the flow of codes generated in the subsequent capture is started at the stage where the occupation amount of the VBV buffer 709 by the preceding chapter remains large, the VBV buffer 709 may overflow.
- the VBV buffer 709 may underflow.
- the code amount required to decode the first picture (I 2) in the subsequent capture is instantaneously extracted
- the VBV buffer 709 does not have enough code, Does not have the data necessary for decoding, so seamless connection is no longer possible.
- the In order to accumulate a sufficient amount of codes in advance it is necessary to start the bitstream transfer of the subsequent capture as soon as possible, but after the transfer of the previous capture is completed, the transfer of the bitstream is completed. This is also limited by the restriction that a transfer must be initiated.
- the code amount generated in the subsequent capture time is limited as follows. Perform encoding. Note that since the VBV buffers 701 and 709 described above have a two-sided relationship, the following description will be made on the assumption that the VBV buffer 701 is used.
- FIG. 6 is a diagram showing a functional configuration example of the processor 510 of the encoding control unit 500 in the embodiment of the present invention.
- This functional configuration example includes a recording mode discriminating unit 5 11, an occupation amount updating unit 5 12, an optimal occupying amount calculating unit 5 13, a target code amount calculating unit 5 14, and a target code amount adjusting unit. It comprises a unit 5 15 and a quantization index determining unit 5 16. Note that in this example, it is assumed that the processor 510 implements each function according to the program stored in the ROM 520, but these functions may be implemented by hardware. Good.
- the recording mode determination unit 511 determines whether seamless connection between the chapters is possible.
- the conditions for a seamless connection are that the subsequent capture for seamless connection is not the first capture of the title to which it belongs, the last V ⁇ B of the previous capture is not less than 1.5 seconds in playback time, That the seek time caused by the placement of the target is within the allowable range.
- the presence / absence of the seamless connection determined by the recording mode determination unit 5 11 is determined by the PG of VTSI (Video Title Set Information) in the data storage area of the DVD. This is reflected in the seamless playback flag in the C—PBIT (Cell PlayBack Information Table) in the CI (ProGram Chain Information) fc. That is, the seamless playback flag of the succeeding chapter is set to ON when a seamless connection is performed, and the seamless playback flag of the subsequent capture is set to OFF when the seamless connection is not performed. .
- the recording mode determination unit 511 determines the occupancy immediately before the VBV buffer stored in the RAM 530 (or ROM 520) by the VBV buffer. Set as the initial value of. On the other hand, if it is determined that seamless connection is not possible, zero is set as the initial value of the VBV buffer.
- the initial value of the VBV buffer corresponds to the occupation amount “B 0” in FIG. The initial value of the VBV buffer set in this way is supplied to the occupancy update unit 512.
- the occupancy update unit 512 updates the occupancy of the VBV buffer based on the generated code amount supplied from the buffer memory 171 of the video encoder 100. For example, if “B 0 + P 0” in FIG. 4 is the immediately preceding timing, the transfer code amount from “B 0 + P 0” to “B 1” is reduced, and the generated code amount “P 1” Add.
- the transfer rate Rmax is 9.3 Mbps and that the NTSC (National Television Standards Committee) system is used as the screen system, the frame frequency of NTSC is
- the optimal occupancy calculation unit 513 calculates the optimal occupancy of the VBV buffer when the next picture is coded.
- BX means the usage of the VBV buffer before encoding the Xth picture
- By means the optimal occupancy of the VBV buffer after encoding the Xth picture.
- B y V B V (B X) is a monotone increasing function for B X in the interval [0, B max] of B x.
- Feature 3 If B x ⁇ B th, ⁇ VBV (BX) one (R max XT) ⁇ ⁇ B x, and if B x> B th, ⁇ VBV (BX) one (Rmax XT) ⁇ ⁇ B x.
- FIG. 7 shows an example of a VBV function having the above three features.
- B y is constant at a predetermined value (a value equal to or greater than B th) when BX is [0, B th], and B y is constant when BX is [B th, B ma]. Increase gradually at a rate of less than 1.
- the optimal occupancy calculation unit 5 13 supplies the optimal occupancy of the VBV buffer obtained in this way to the target code amount adjustment unit 5 15.
- the target code amount calculator 514 calculates a target code amount based on a moving image signal of a subsequent chapter for performing seamless connection.
- Various models have been proposed for calculating the target code amount.
- the well-known TM5 system is assumed as an example.
- This TM5 system has been proposed as a model for controlling the amount of code of MPEG-2 (see ISO / IEC JTC1 / SC29 / G11, MPEG93 / 457, "Test Model 5," 1993.)
- the distribution of the code amount is determined according to the picture type.
- the target code amount adjuster 5 15 refers to the target code amount calculated by the target code amount calculator 5 14 and the optimal occupancy calculated by the optimal occupancy calculator 5 13, Determine whether the sum of the current occupancy and the target code amount exceeds the optimal occupancy. If it exceeds, the target code amount is adjusted so that the value obtained by subtracting the current occupancy from the optimal occupancy becomes the target code amount.
- the target code amount adjusted in this way is calculated by the quantization index determination unit 5 16 Supplied to
- the quantization index determination unit 5 16 sets the quantization characteristic in the quantization circuit 15 1 so that the generated code amount in the video encoder 100 becomes the target code amount supplied from the target code amount adjustment unit 5 15. Determine the quantization index corresponding to the value. This quantization index is supplied to the quantization circuit 15 1 via the signal line 159.
- FIG. 8 is a flowchart showing a processing example of the moving picture coding apparatus according to the embodiment of the present invention.
- the recording mode determining unit 511 determines whether or not to perform seamless connection as the recording mode (step S901). If a seamless connection is to be made (step S 902), the occupancy immediately before the VBV buffer held in RAM 530 (or ROM 520) is set as the initial value of the VBV buffer. (Step S903). On the other hand, when the seamless connection is not performed (step S902), zero is set as the initial value of the VBV buffer (step S904).
- FIG. 9 is a flowchart showing a processing example of control (step S906) on the VBV buffer in the embodiment of the present invention. As is clear from Fig. 8, the control for the VBV buffer is executed every time one picture (frame) of encoding is performed.
- the occupancy update unit 511 updates the information on the occupancy of the VBV buffer (step S911). As a result, the occupation amount of the VBV buffer immediately after encoding is grasped. The details of this processing will be described later with reference to FIG.
- the optimal occupancy calculating unit 513 calculates the optimal occupancy of the VBV buffer after the next encoding (step S911). This optimal occupancy can be calculated by, for example, the above-described VBV function. Further, the target code amount calculation section 514 calculates a target code amount in the next code (step S913). This target code amount can be calculated by, for example, the known T M.5 method.
- the target code amount adjustment unit 515 calculates the value obtained by adding the current occupation amount of the VBV buffer determined in step S911 and the target code amount calculated in step S913 to step S911. It is determined whether or not the optimum occupancy calculated in 9 12 has been exceeded (step S 9 14). If so, the value obtained by subtracting the current occupancy from the optimum occupancy is calculated as the target code amount. (Step S915).
- the quantization index determining unit 516 determines the quantization index (step S 916). This quantization index is It is supplied to the quantization circuit 15 1 of 0 0.
- FIG. 10 is a flowchart showing a processing example of updating information (step S911) on the occupancy of the VBV buffer according to the embodiment of the present invention.
- the transfer code amount for one cycle is subtracted from the immediately preceding occupation amount in the VBV buffer.
- the occupation amount before the subtraction is compared with the transfer code amount for one cycle (30.131 K bits in the above example) (step S921), and the occupation amount before the subtraction is calculated. If it is larger, the result of the subtraction becomes the new occupancy (step S922), otherwise the VBV buffer underflows and the new occupancy becomes zero (step S922).
- the generated code amount in the video encoder 100 is further added to the new occupation amount (step S9224). If the occupied amount after this addition exceeds the maximum amount of the VBV buffer (step S925), an overflow will occur and the new occupied amount will be the maximum amount of the VBV buffer (step S926). ).
- the recording mode determining unit 511 determines whether or not to perform the seamless connection during the capture time, and the initial value of the VBV buffer is determined in advance based on the determination result.
- the embodiment of the present invention is an example for embodying the present invention, and has a correspondence relationship with the invention-specifying matters in the claims as described below, but is not limited thereto.
- the virtual buffer corresponds to, for example, the VBV buffer 70 1.
- the recording mode determining means corresponds to, for example, the recording mode determining unit 5 11.
- the occupancy update unit corresponds to, for example, the occupancy update unit 512.
- the optimal occupancy calculation means corresponds to, for example, the optimal occupancy calculation unit 5 13.
- the target code amount calculation means corresponds to, for example, the target code amount calculation section 514.
- the target code amount adjusting means corresponds to, for example, the target code amount adjustment section 5 15.
- the encoding means corresponds to, for example, the video encoder 100.
- the virtual buffer corresponds to, for example, the VBV buffer 701.
- the recording mode determining means corresponds to, for example, the recording mode determining unit 511.
- the occupancy update means corresponds to, for example, the occupancy update unit 5 12.
- the optimum occupancy calculating means corresponds to, for example, the optimum occupancy calculating unit 5 13.
- the target code amount calculating means corresponds to, for example, the target code amount calculating section 514.
- the virtual buffer corresponds to, for example, the VBV buffer 70 1.
- the procedure for determining whether seamless connection is possible between the preceding chapter and the following chapter included in the video signal corresponds to, for example, step S910.
- the procedure for setting the initial value of the occupation amount of the virtual buffer according to the determination result corresponds to, for example, steps S 902 to S 904.
- the procedure for updating the occupancy of the virtual buffer every time encoding is performed corresponds to, for example, step S911.
- the procedure for calculating the predetermined optimum occupancy based on the updated occupancy of the virtual buffer corresponds to, for example, step S ⁇ b> 912.
- a procedure for calculating a predetermined target code amount based on a moving image signal of a subsequent chapter is an example. For example, it corresponds to step S 9 13.
- the procedure for adjusting the target code amount so that the total amount obtained by adding the target code amount to the occupation amount of the virtual buffer does not exceed the optimum occupancy amount and performing encoding corresponds to, for example, steps S914 and S915. I do.
- the virtual buffer corresponds to, for example, the VBV buffer 701.
- the procedure for determining whether seamless connection is possible between the preceding chapter and the following chapter included in the moving image signal corresponds to, for example, step S910. If it is determined that seamless connection is possible in the above determination result, the occupancy of the virtual buffer immediately before the moving image signal of the subsequent capture is transferred to the virtual buffer is set as the initial value of the occupancy of the virtual buffer, and the seamless
- the procedure of setting zero as the initial value of the occupation amount of the virtual buffer when it is determined that the connection is not possible corresponds to, for example, steps S902 to S904.
- the procedure for updating the occupancy of the virtual buffer each time encoding is performed corresponds to, for example, step S911.
- the procedure for calculating the predetermined optimal occupancy based on the updated occupancy of the virtual buffer corresponds to, for example, step S912.
- the procedure for calculating the predetermined target code amount based on the moving picture signal of the subsequent capture corresponds to, for example, step S913.
- the procedure for adjusting the target code amount so that the total amount obtained by adding the target code amount to the occupation amount of the virtual buffer does not exceed the optimum occupancy amount and providing the coding is described in, for example, steps S914 and S915. Corresponding.
- processing procedure described in the embodiment of the present invention may be regarded as a method having a series of these procedures, and a program or a program for causing a computer to execute the series of procedures. May be regarded as a recording medium for storing the information.
- the present invention can be applied to, for example, encoding a moving image signal into an MPEG-2 format and writing the encoded signal to a DVD.
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Abstract
Description
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Priority Applications (4)
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US10/538,086 US7835436B2 (en) | 2003-10-29 | 2004-10-29 | Video-encoding device and video-encoding control method |
CN2004800017539A CN1723709B (zh) | 2003-10-29 | 2004-10-29 | 视频编码设备和视频编码控制设备及其方法 |
KR20057011846A KR101091418B1 (ko) | 2003-10-29 | 2004-10-29 | 동화상 부호화 장치 및 동화상 부호화 제어 방법 |
EP04793392A EP1583365A4 (en) | 2003-10-29 | 2004-10-29 | VIDEO CODIER AND VIDEO PROCESS CONTROL |
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JP2003-369388 | 2003-10-29 | ||
JP2003369388A JP3675464B2 (ja) | 2003-10-29 | 2003-10-29 | 動画像符号化装置および動画像符号化制御方法 |
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EP (1) | EP1583365A4 (ja) |
JP (1) | JP3675464B2 (ja) |
KR (1) | KR101091418B1 (ja) |
CN (1) | CN1723709B (ja) |
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US20060050778A1 (en) | 2006-03-09 |
US7835436B2 (en) | 2010-11-16 |
JP2005136633A (ja) | 2005-05-26 |
EP1583365A1 (en) | 2005-10-05 |
CN1723709B (zh) | 2012-04-25 |
JP3675464B2 (ja) | 2005-07-27 |
TW200531553A (en) | 2005-09-16 |
KR20060121656A (ko) | 2006-11-29 |
CN1723709A (zh) | 2006-01-18 |
TWI264227B (en) | 2006-10-11 |
KR101091418B1 (ko) | 2011-12-07 |
EP1583365A4 (en) | 2011-11-30 |
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