JP4793150B2 - Video signal processing apparatus, video signal information processing method, and program - Google Patents

Description

  The present invention relates to a video signal processing device, a video signal information processing method, and a program, and in particular, a video signal processing device and a video signal information processing method suitable for use when decoding and re-encoding an encoded video signal, And the program.

  For example, when editing is performed such that a predetermined section is extracted from a video signal (hereinafter, referred to as an encoded video signal) that has been compression-encoded by the MPEG2 method or the like, when extracting in GOP (Group of Pictures) units, The editing can be performed with a relatively small amount of calculation without decoding the video signal.

  On the other hand, when extracting in frame units more finely than in GOP units, there is a reference relationship between pictures, so decoding processing is essential. The simplest method is to extract a predetermined section after decoding all the encoded data.

  However, even if all of the encoded data is decoded, it is necessary to encode again after extraction, and therefore a wasteful calculation may be performed, and it takes time to complete a series of processing.

  Thus, there is a technique called smart rendering editing as a method for executing editing as quickly as possible to extract a predetermined section in frame units from an encoded video signal (see, for example, Patent Document 1).

  In smart rendering editing, for example, when editing is performed to extract an arbitrary section from a continuous encoded video signal as shown in FIG. 1A, only GOPs each including a leading end and a terminal end are decoded and desired. Are extracted and encoded again.

  On the other hand, in the extraction section, an intermediate portion other than the leading GOP and the terminating GOP is extracted without decoding the encoded video signal as it is.

  Thus, by omitting the decoding process and the re-encoding process of the intermediate part of the extraction section, the amount of calculation required for editing can be reduced and the extraction can be executed more quickly.

JP 2004-104361 A

  When the smart rendering editing described above is performed, the editing result is output as it is without being re-encoded as shown in FIG. 1B. There will be an intermediate part.

  Normally, when the encoded video signal is decoded and re-encoded, the image quality deteriorates compared to the encoded video signal before editing, even if the re-encoding bit rate is the same as that of the encoded video signal before editing. It is known to end up.

  Therefore, when smart rendering editing is performed without taking any special measures and the encoded video signal is reproduced after editing, the image quality of the re-encoded part of the extracted section is deteriorated and the impression is poor, and the re-encoded part and the intermediate The boundary of the part becomes clear and it becomes visually conspicuous.

  In particular, when the encoder that encodes the encoded video signal before editing and the encoder that performs re-encoding are not the same, and the tastes of picture creation are different from each other, the above-described problem appears more prominently.

  The present invention has been made in view of such circumstances, and is intended to prevent image quality deterioration of a re-encoded portion in editing of an encoded video signal.

A video signal processing apparatus according to one aspect of the present invention includes a decoding unit that decodes an input encoded video signal in a video signal processing apparatus that decodes an encoded video signal and encodes the resulting video signal. Detection means for detecting encoding information related to encoding settings when the encoded video signal is encoded from the input encoded video signal, and re-encoding based on the detected encoding information and re-encoding information generating means for generating a re-coded information to be used when, in accordance with the generated the re-encoded information, see contains an encoding means for encoding a video signal of the decoding result, said detecting means and The re-encoded information generating means is a first image quality deterioration reducing process in which the detecting means uses the input encoded video signal from the input encoded video signal as the GOP average bit rate A and average amount to be processed. When the re-encoding information generating means detects re-encoding information as re-encoding information based on the average bit rate A and the average quantized value B of the GOP. The set bit rate C and the initial quantized value D used in the above are generated so as to satisfy C = A × B / D, C ≧ A, and as the second image quality deterioration reduction process, the detection means A code amount Ej and a quantized value Qj for each frame of the GOP are detected as encoded information from a video signal, and the re-encoding information generation unit detects the code amount Ej for each frame of the detected GOP and the Based on the quantization value Qj, the quantization offset values Qoi, Qop, Qob of each picture type are expressed as
Qoi = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qop = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qob = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of B picture frames in the GOP)
Generate according to

  A video signal processing apparatus according to an aspect of the present invention separates a series of encoded video signal streams into a re-encoded portion that is re-encoded and an intermediate portion that is sandwiched between the re-encoded portions and is not re-encoded. Separating means may be further included.

A video signal processing method according to one aspect of the present invention is a video signal processing method of a video signal processing apparatus that decodes an encoded video signal and encodes the resulting video signal. A decoding step for decoding, and an average bit rate A and an average quantization value B of a GOP to be processed are detected as encoding information from the input encoded video signal, and the average bit rate A and the average of the GOP Based on the quantized value B, as the re-encoded information, a set bit rate C and an initial quantized value D used for re-encoding are generated so as to satisfy C = A × B / D, C ≧ A. The image quality degradation reduction processing step 1 and the input encoded video signal are used to detect the code amount Ej and quantized value Qj for each frame of the GOP as encoded information, and the detected GO Based on the code amount Ej and the quantization value Qj for each P frame, the quantization offset values Qoi, Qop, Qob of each picture type are expressed as
Qoi = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qop = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qob = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of B picture frames in the GOP)
A second image quality degradation reduction processing step generated according to
An encoding step of encoding a video signal as a decoding result according to the generated re-encoding information.

A program according to one aspect of the present invention is a program for controlling a video signal processing device that decodes an encoded video signal and encodes the resultant video signal, and decodes the input encoded video signal A decoding step, and an average bit rate A and an average quantization value B of a GOP to be processed are detected as encoded information from an input encoded video signal, and the average bit rate A and the average quantum of the GOP are detected. Based on the quantized value B, as the re-encoded information, a set bit rate C and an initial quantized value D used for re-encoding are generated so as to satisfy C = A × B / D, C ≧ A The image quality degradation reduction processing step of the GOP and the input encoded video signal are used to detect the code amount Ej and quantized value Qj for each frame of the GOP as encoding information, and the detected frame of the GOP is detected. Based on the code amount Ej and the quantization value Qj for each arm, as the re-encoding information, the following equation each picture type of the quantization offset value Qol, Qop, the Qob
Qoi = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qop = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qob = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of B picture frames in the GOP)
A second image quality degradation reduction processing step generated according to
In accordance with the generated re-encoding information, the computer of the video signal processing apparatus executes a process including an encoding step of encoding the video signal as a decoding result.

In one aspect of the present invention, it is decoded by the input coded video signal, from the input encoded video signal, the average of the GOP to be processed bit rate A and the average quantization value B detected as encoded information Based on the average bit rate A and average quantization value B of the GOP, the set bit rate C and the initial quantization value D used at the time of re-encoding are C = A × B / D, as re-encoding information, It is generated so as to satisfy C ≧ A. Also, the code amount Ej and quantized value Qj for each GOP frame are detected as encoded information from the input encoded video signal, and based on the detected code amount Ej and quantized value Qj for each GOP frame. As re-encoding information, the quantization offset values Qoi, Qop, Qob of each picture type are
Qoi = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qop = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qob = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of B picture frames in the GOP)
Is generated according to Further, the decoded video signal is encoded according to the generated re-encoding information.

  According to one aspect of the present invention, it is possible to suppress deterioration in image quality of a re-encoded portion when editing an encoded video signal. In addition, the boundary of the re-encoded part in the edited result can be made inconspicuous.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 2 shows a first configuration example of an editing apparatus according to an embodiment of the present invention. The editing apparatus 10 performs smart rendering editing of the encoded video signal input from the previous stage, and performs a first deterioration reduction process described later in the re-encoding, thereby performing a re-encoding portion accompanying the smart rendering editing. Image quality degradation is suppressed. Furthermore, by performing the second deterioration reduction process, the re-encoding portion painting taste associated with smart rendering editing is adjusted based on the pre-editing coding video signal taste. The boundary between the encoded part and the intermediate part is made inconspicuous.

  It is assumed that the input encoded video signal is encoded by the H.264 / AVC format. Hereinafter, the input encoded video signal is also described as an input H.264 / AVC stream. The taste of picture creation aimed by the encoder that encodes the input H.264 / AVC stream and the taste of picture creation aimed by the encoder (re-encoding unit 14) built in the editing apparatus 10 are not necessarily the same. There is no need.

  The editing apparatus 10 includes an operation input unit 11 for inputting a user operation for designating an extraction section, and a GOP encoded video signal including a picture at the leading end of the extraction section to be re-encoded from the input H.264 / AVC stream. And the GOP encoded video signal including the frame at the end of the extraction interval to the decoding unit 13 and the information extraction unit 15, and the encoded video signal of the intermediate portion of the extraction interval that is not re-encoded to the combining unit 17. Setting information notified from the information analysis unit 16 of a frame included in the extraction section of the decoding unit 13 that decodes the encoded video signal input from the switching unit 12 to be output, the decoding unit 12, and the decoding result video signal The re-encoding unit 14 for re-encoding according to the above, the information extracting unit 15 for extracting predetermined information from the encoded video signal input from the switching unit 12, and the re-encoding based on the extracted predetermined information The information analysis unit 16 that determines constant information, and the encoded video signal of the re-encoded result and the encoded video signal of the intermediate part that is not re-encoded are combined and output to the subsequent stage as an output H.264 / AVC stream It is comprised from the coupling | bond part 17 which does.

  Next, FIG. 3 shows a second configuration example of the editing apparatus according to the embodiment of the present invention. In the second configuration example, the decoding unit 13 and the information extraction unit 15 in the first configuration example are integrated to form a decoded information extraction unit 21. The other components are the same as those in the first configuration example, and are given the same reference numerals, and the description thereof is omitted.

  Next, smart rendering editing processing by the editing apparatus 10 according to an embodiment of the present invention will be described with reference to the flowchart of FIG.

  In step S <b> 1, the operation input unit 11 accepts a user operation that specifies a section to be extracted from a series of input H.264 / AVC streams, and notifies the switching unit 12 of the specified extraction section. In response to this notification, the switching unit 12 includes, from the input H.264 / AVC stream, a GOP encoded video signal including a frame at the head of the extraction section to be re-encoded and a frame at the end of the extraction section. The GOP encoded video signal is output to the decoding unit 13 and the information extracting unit 15, and the encoded video signal of the intermediate part that is not re-encoded in the extracted section is output to the combining unit 17.

  In step S <b> 2, the decoding unit 13 decodes the encoded video signal of the GOP of the leading end portion or the GOP of the terminal end portion of the extraction section input from the switching unit 12, and sends the resulting video signal to the re-encoding unit 14. Output.

  In step S3, the information extraction unit 15 and the information analysis unit 16 execute a first deterioration reduction process, determine setting information in re-encoding, and notify the re-encoding unit 14. In step S4, the information extraction unit 15 and the information analysis unit 16 execute a second deterioration reduction process, determine setting information in re-encoding, and notify the re-encoding unit 14. The first and second deterioration reduction processes will be described later.

  In step S5, the re-encoding unit 14 re-encodes the pictures included in the extraction interval in the decoded video signal according to the setting information determined by the first and second deterioration reduction processes, and obtains the result. The encoded video signal is output to the combining unit 17. The combining unit 17 combines the encoded video signal as a result of re-encoding and the encoded video signal of the intermediate part that is not re-encoded, and outputs it as an output H.264 / AVC stream to the subsequent stage.

  As described above, in smart rendering editing by the editing apparatus 10, setting information at the time of re-encoding is determined by the first and second deterioration reduction processes, so that deterioration in image quality when the re-encoded portion is reproduced is suppressed. can do. In addition, it is possible to prevent a situation where the boundary between the re-encoded portion and the portion not re-encoded is conspicuous.

  In the above description, it has been described that both the first and second deterioration reduction processes are executed. However, at least one of the first or second deterioration reduction process may be executed.

  Next, the first deterioration reduction process in step S3 will be described in detail with reference to the flowchart of FIG.

  In step S11, the information extraction unit 15 partially decodes the encoded video signal of the GOP (or GOP of the end portion) to be re-encoded and input from the switching unit 12 as necessary, and averages The bit rate A and the average quantized value B are extracted and output to the information analysis unit 16. In step S12, the information analysis unit 16 applies the extracted average bit rate A and average quantized value B to the following equation, and calculates the set bit rate C and initial quantized value D during re-encoding. The calculation result is output to the re-encoding unit 14 as setting information.

  C = A * B / minimum quantization value; D = minimum quantization value;

  However, the formula for obtaining the set bit rate C and the initial quantization value D may be other than the above. The maximum bit rate allowed for operation may not be exceeded, or the minimum quantization value necessary for maintaining acceptable image quality may not be exceeded.

Here, the minimum quantized value refers to a quantized value that does not visually cause deterioration in image quality. The set bit rate C and the initial quantized value D, which are the results of this calculation, have the following relationship compared to the average bit rate A and the average quantized value B. Can be deterred.
Set bit rate C ≥ Average bit rate A
Initial quantization value D <average quantization value B

  If the quantized value of the GOP head picture before editing is set to the average quantized value B, the delay of the first deterioration reducing process by the information extracting unit 15 and the information analyzing unit 16 with respect to the decoding process of the decoding unit 13 will be described. The amount can be reduced.

  Note that other than the average bit rate A and the average quantized value B may be used for calculating the set bit rate C and the initial quantized value D. For example, the number and size of motion vectors may be extracted and determined by taking into account their encoding information.

  Next, a first operation example of the second deterioration reduction process in step S4 will be described in detail with reference to the flowchart of FIG.

  In step S21, the information extraction unit 15 partially decodes the encoded video signal of the front-end GOP (or the final-end GOP) to be re-encoded, which is input from the switching unit 12, as necessary, and the entire GOP And the average quantized values Qi, Qp, and Qb of the I, P, and B pictures included in the GOP are extracted and output to the information analysis unit 16. For the average quantization value B of the entire GOP, the value extracted in the first deterioration reduction process can be used. Alternatively, the average quantization value of the I picture in the GOP can be approximated as B.

In step S22, the information analysis unit 16 applies the extracted average quantization value B of the entire GOP and the average quantization values Qi, Qp, and Qb of the I, P, and B pictures included in the GOP to the following equations. Then, the quantization offset values Qoi, Qop, and Qob of the I, P, and B pictures at the time of re-encoding are calculated, and the calculation result is output to the re-encoding unit 14 as setting information.
Qoi = Qi-B
Qop = Qp-B
Qob = Qb-B

  However, the expression for obtaining the quantization offset values Qoi, Qop, Qob may be other than the above.

Based on this setting information, the re-encoding unit 14 adds the quantized offset values Qoi, Qop, Qob to the original quantized values baseQi, baseQp, baseQb for the I, P, B pictures, respectively, and re-quantizes Is done.
Quantized value of I picture = baseQi + Qoi
P picture quantization value = baseQp + Qop
B picture quantization value = baseQb + Qob

  By the first operation example of the second deterioration reduction process, the bit allocation ratio of each picture in the encoded video signal before editing is reflected in the re-encoding result. Therefore, the picture-making taste of the encoded video signal before editing can be continued in the re-encoding result. Therefore, the boundary between the re-encoded part and the intermediate part can be made inconspicuous.

  Next, a second operation example of the second deterioration reduction process in step S4 will be described in detail with reference to the flowchart of FIG.

  In step S31, the information extraction unit 15 partially decodes the encoded video signal of the front-end GOP (or the end-part GOP) to be re-encoded, which is input from the switching unit 12, as necessary, and the entire GOP The average quantization value B, the code amount Ej of each frame included in the GOP, and the quantization value Qj are extracted and output to the information analysis unit 16. As the average quantization value B of the entire GOP, the value extracted in the first deterioration reduction process can be used. The code amount Ej and the quantized value Qj of each frame can be extracted more accurately by referring to the skip macroblock and CPB = 0 information.

In step S32, the information analysis unit 16 applies the average quantization value B of the entire extracted GOP, the code amount Ej of each frame included in the GOP, and the quantization value Qj to the following equations, The average quantization values AvQi, AvQp, AvQb of the P and B pictures are calculated.
AvQi = Σ (Ej * Qj) / Σ (Ej)
Σ indicates the sum total of the frames of the I picture in the GOP.
AvQp = Σ (Ej * Qj) / Σ (Ej)
Σ indicates the sum of frames of P picture in GOP AvQb = Σ (Ej * Qj) / Σ (Ej)
Σ indicates the sum of B picture frames in the GOP

Further, the calculated average quantization values AvQi, AvQp, and AvQb are applied to the following equations to calculate the quantization offset values Qoi, Qop, and Qob of the I, P, and B pictures at the time of re-encoding, and the calculation result is set. Information is output to the re-encoding unit 14.
Qoi = AvQi-B
Qop = AvQp-B
Qob = AvQb-B

However, the expression for obtaining the quantization offset values Qoi, Qop, Qob may be other than the above. For example, the average quantization value B of the entire GOP may be calculated using the following equation to obtain the quantization offset values Qoi, Qop, Qob.
B = Σ (Ej * Qj) / Σ (Ej)
Σ indicates the total sum of frames of pictures in the GOP.
Qoi = Qi-B
Qop = Qp-B
Qob = Qb-B

Based on this setting information, the re-encoding unit 14 adds the quantized offset values Qoi, Qop, Qob to the original quantized values baseQi, baseQp, baseQb for the I, P, B pictures, respectively, and re-quantizes Is done.
Quantized value of I picture = baseQi + Qoi
P picture quantization value = baseQp + Qop
B picture quantization value = baseQb + Qob

  According to the second operation example of the second deterioration reduction process, the bit allocation of each picture at the time of re-encoding is determined according to the difficulty level of the frame belonging to each picture in the encoded video signal before editing. Therefore, it is possible to reflect the picture-making taste of the encoded video signal before editing in the re-encoding result. Therefore, the boundary between the re-encoded part and the intermediate part can be made inconspicuous.

  In the above description, the quantization offset amount of each picture included in the GOP is obtained to maintain the taste of picture creation between pictures before and after re-encoding. By replacing the picture with a picture and a macroblock, respectively, it is possible to maintain the taste of picture creation in the picture before and after re-encoding.

  In the second deterioration reduction process, one of the first and second operation examples described above may be executed.

  Note that the present invention is not limited to a device that performs smart rendering editing processing, such as the editing apparatus 10 according to the present embodiment, but may be applied to any device that performs processing of decoding encoded video data and encoding again. Can do.

  The present invention can also be applied to the case of editing an encoded video signal encoded by an encoding method other than the H.264 / AVC method.

  The present invention can also be applied, for example, when the encoding method before encoding is different from the encoding method after editing (for example, when the encoded video signal is subjected to format conversion).

  The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a recording medium in a general-purpose personal computer as shown in FIG.

  The personal computer 50 includes a CPU (Central Processing Unit) 51. An input / output interface 55 is connected to the CPU 51 via the bus 54. A ROM (Read Only Memory) 52 and a RAM (Random Access Memory) 53 are connected to the bus 54.

  The input / output interface 55 includes an input unit 56 including an input device such as a keyboard and a mouse for a user to input an operation command, a CRT (Cathode Ray Tube) or an LCD (Liquid Crystal) for displaying a reproduced video signal image and an operation screen. Output unit 57 composed of a display such as a display), storage unit 58 composed of a hard disk drive for storing programs and various data, and a modem, a LAN (Local Area Network) adapter, etc., via a network represented by the Internet A communication unit 59 that executes communication processing is connected. Also, a magnetic disk (including a flexible disk), an optical disk (including a CD-ROM (Compact Disc-Read Only Memory), a DVD (Digital Versatile Disc)), a magneto-optical disk (including an MD (Mini Disc)), or a semiconductor A drive 60 for reading / writing data from / to a recording medium 61 such as a memory is connected.

  A program for causing the personal computer 50 to execute the above-described series of processing is supplied to the personal computer 50 while being stored in the recording medium 61, read by the drive 60, and installed in a hard disk drive built in the storage unit 58. Has been. The program installed in the storage unit 58 is loaded from the storage unit 58 to the RAM 53 and executed by a command of the CPU 51 corresponding to a command from the user input to the input unit 56.

  In this specification, the steps executed based on the program are executed in parallel or individually even if they are not necessarily processed in time series, as well as processes executed in time series according to the described order. It also includes processing.

  The embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

It is a figure for demonstrating smart rendering edit. It is a block diagram which shows the 1st structural example of the editing apparatus to which this invention is applied. It is a block diagram which shows the 2nd structural example of the editing apparatus to which this invention is applied. It is a flowchart explaining a smart rendering edit process. It is a flowchart explaining a 1st reduction process. It is a flowchart explaining the 1st operation example of a 2nd reduction process. It is a flowchart explaining the 2nd operation example of a 2nd reduction process. It is a block diagram which shows the structural example of a general purpose personal computer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Editing apparatus, 11 Operation input part, 12 Switching part, 13 Decoding part, 14 Re-encoding part, 15 Information extraction part, 16 Information analysis part, 17 Connection part, 21 Decoding information extraction part, 50 Personal computer, 51 CPU

Claims (4)

In a video signal processing apparatus for decoding an encoded video signal and encoding the resulting video signal,
Decoding means for decoding the input encoded video signal;
Detecting means for detecting coding information related to coding settings when the coded video signal is coded from the inputted coded video signal;
Re-encoding information generating means for generating re-encoding information for use in re-encoding based on the detected encoding information;
According generated the re-encoded information, see contains an encoding means for encoding a video signal of the decoding result,
The detecting means and the re-encoded information generating means are
As the first image quality degradation reduction process,
The detection means detects the average bit rate A and average quantization value B of the GOP to be processed from the input encoded video signal as encoded information,
Based on the average bit rate A and the average quantized value B of the GOP, the re-encoded information generating means uses a set bit rate C and an initial quantized value used for re-encoding as re-encoded information. D is generated so as to satisfy C = A × B / D, C ≧ A,
As the second image quality degradation reduction process,
The detection means detects a code amount Ej and a quantization value Qj for each frame of the GOP as encoded information from the input encoded video signal,
Based on the detected code amount Ej and the quantized value Qj for each frame of the GOP, the re-encoded information generating means uses, as re-encoded information, quantized offset values Qoi, Qop, Qob is the following formula
Qoi = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qop = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qob = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of B picture frames in the GOP)
A video signal processing device that generates according to the above . The video according to claim 1, further comprising separation means for separating a series of encoded video signal streams into a re-encoded part to be re-encoded and an intermediate part between the re-encoded part and not to be re-encoded. Signal processing device. In a video signal processing method of a video signal processing apparatus for decoding an encoded video signal and encoding a resulting video signal,
A decoding step of decoding the input encoded video signal;
An average bit rate A and an average quantization value B of a GOP to be processed are detected as encoded information from the input encoded video signal, and based on the average bit rate A and the average quantization value B of the GOP Thus, as the re-encoding information, the first image quality deterioration reduction process for generating the set bit rate C and the initial quantized value D used for re-encoding so as to satisfy C = A × B / D, C ≧ A Steps,
The code amount Ej and the quantized value Qj for each frame of the GOP are detected as encoded information from the input encoded video signal, and the code amount Ej and the quantized value Qj for each detected frame of the GOP are detected. Based on the above, the quantization offset values Qoi, Qop, Qob for each picture type are expressed as
Qoi = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qop = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qob = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of B picture frames in the GOP)
A second image quality degradation reduction processing step generated according to
An encoding step of encoding a video signal as a decoding result in accordance with the generated re-encoding information;
Video signal processing method, including. A program for controlling a video signal processing apparatus that decodes an encoded video signal and encodes the resulting video signal,
A decoding step of decoding the input encoded video signal;
An average bit rate A and an average quantization value B of a GOP to be processed are detected as encoded information from the input encoded video signal, and based on the average bit rate A and the average quantization value B of the GOP Thus, as the re-encoding information, the first image quality deterioration reduction process for generating the set bit rate C and the initial quantized value D used for re-encoding so as to satisfy C = A × B / D, C ≧ A Steps,
The code amount Ej and the quantized value Qj for each frame of the GOP are detected as encoded information from the input encoded video signal, and the code amount Ej and the quantized value Qj for each detected frame of the GOP are detected. Based on the above, the quantization offset values Qoi, Qop, Qob for each picture type are expressed as
Qoi = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qop = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of P picture frames in the GOP)
Qob = Σ (Ej * Qj) / Σ (Ej) −B
(Σ indicates the total sum of B picture frames in the GOP)
A second image quality degradation reduction processing step generated according to
A program for causing a computer of a video signal processing apparatus to execute a process including an encoding step of encoding a video signal as a decoding result according to the generated re-encoding information.

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