JP2007110252A - Video decoding reproducing apparatus and method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video decoding reproducing apparatus and a method thereof that can attach mute information to a decoded image as attached information so as to enhance the accuracy of mute ON/OFF control or like processing for an output video signal. <P>SOLUTION: The video decoding reproducing apparatus includes: a decoding state discrimination section 13 for discriminating whether or not a decoding image in a decoding section is correctly decoded; a display processing section 16 capable of applying prescribed processing including at least mute processing to the decoded image and outputting a video signal subjected to the prescribed processing; and a mute discrimination section 15 for discriminating the mute control of the output video signal from the display processing section 16. When discriminating that a decoded image of the decoding section 12 is disturbed on the basis of results of the image form information analysis by an information extract analysis section 11 and a result of the discrimination by the decoding state discrimination section 13, the mute discrimination section 15 generates image display information resulting from attaching storage addresses of the disturbed decoded image in a decoding image memory 14 and mute-on information to image form information and transmits the generated image display information to the display processing section 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a video decoding / reproducing apparatus and method for decoding and reproducing compressed image data such as digital broadcasting.

When viewing digital broadcasts, etc., processing to decode compressed image data occurs. For example, if channel switching is performed, decoding of the stream is stopped before switching, and decoding is started after switching. The process to do is surely entered.
Here, in order to start the decoding process, it is necessary to wait for input of an I picture, time information, and image format information. To start the display process, the decoded images are rearranged in the display order. Therefore, it is necessary to wait until the display time is reached.

Usually, while a correctly decoded image cannot be displayed, a mute process for preventing the image from being displayed is performed.
However, in general, since the host controller for the decoding unit and the display unit detects a disturbance of the decoded image and performs a mute control on the display unit according to the disturbance, a period of time longer than that of the disturbance period of the image is used. Mute will occur.
Due to the above-described background, a long-time mute occurs when switching channels for digital broadcasting, which is cited as a dissatisfaction point for users.

Therefore, in order to increase the accuracy of the mute period for a distorted image, a method described in, for example, Patent Document 1 has been proposed so far.
In this method, when receiving and playing back a digital broadcast signal in which a program of video signals with different video resolutions is broadcast continuously in one channel, the video that is detected and output when the resolution of the video signal is switched Mute processing is performed on the signal, and when decoding of the video signal after the resolution is switched is completed, the mute processing is canceled and the video signal is output.
JP-A-11-146291

However, in the technique disclosed in Patent Document 1, since the mute signal is transmitted asynchronously with the decoded image, the display processing of the disordered image on the display unit and the mute timing are not synchronized.
Furthermore, since the resolution change of the decoded stream is used as a mute trigger, the process of muting the disturbance of the decoded image other than at the time of resolution switching due to low C / N or the like cannot be handled.

  It is an object of the present invention to add output restriction information such as mute information as additional information to a decoded image, and to improve the accuracy of output restriction control such as mute on / off in an output video signal It is to provide a reproducing apparatus and a method thereof.

  A first aspect of the present invention is a video decoding / playback apparatus that decodes and plays back a video signal, an information extraction / analysis unit that extracts and analyzes image format information necessary for decoding the video signal, A decoding unit that decodes a video signal based on image format information, a decoding state determination unit that determines whether the decoded image of the decoding unit is correctly decoded, and a decoded image that is decoded by the decoding unit A decoded image memory for storing the image, a display processing unit capable of performing a predetermined process including at least a mute process on the decoded image, and outputting a video signal subjected to the predetermined process, and an output video signal of the display processing unit A mute determination unit that determines the mute control of the decoding unit, and the mute determination unit decodes the decoding unit based on the image format information analysis result of the information extraction analysis unit and the determination result of the decoding state determination unit The image is distorted When it is determined that there, in the image format information, and transmits to the display processing unit creates the storage location of the turbulence are decoded image and the image display information added mute on information in the decoded image memory.

Preferably, when the mute-on information is added to the image display information, the display processing unit displays the video signal to be output after displaying the decoded image at the storage location in the image display information. Mute processing is performed on
Also preferably, when the mute-off information is added to the image display information, the display processing unit displays the decoded image at the storage location in the image display information and outputs the video to be output. Display processing is performed on the signal.

  According to a second aspect of the present invention, there is provided a video decoding / playback apparatus for decoding and playing back a video signal, wherein an information extraction / analysis unit for extracting and analyzing image format information necessary for decoding the video signal; A decoding unit that decodes a video signal based on image format information, a decoding state determination unit that determines whether the decoded image of the decoding unit is correctly decoded, and a decoded image that is decoded by the decoding unit A decoded image memory for storing the image, a display processing unit capable of performing a predetermined process including at least a mute process on the decoded image, and outputting a video signal subjected to the predetermined process, and an output video signal of the display processing unit A mute determination unit that determines mute control of the image, and the mute determination unit decodes the previous one based on an image format information analysis result of the information extraction analysis unit and a determination result of the decoding state determination unit Images and disturbances If it is determined that the state has changed, and transmits to the display processing unit creates image display information added to the location and mute switching information of the decoded image.

  Preferably, when the display processing unit receives the image display information including mute switching information from the mute determination unit, the output video signal obtained by performing display processing on the decoded image in the storage location in the image display information Toggle the presence or absence of mute control.

  According to a third aspect of the present invention, there is provided a video decoding / playback apparatus for decoding and playing back a video signal, wherein an information extraction / analysis unit that extracts and analyzes image format information necessary for decoding the video signal; A decoding unit that decodes a video signal based on image format information, a decoding state determination unit that determines whether the decoded image of the decoding unit is correctly decoded, and a decoded image that is decoded by the decoding unit A decoded image memory for storing the image, a predetermined processing including at least a freeze process on the decoded image, a display processing unit for outputting a video signal subjected to the predetermined process, and freeze control of the output video signal A freeze determination unit for determining, wherein the freeze determination unit disturbs a decoded image of the decoding unit based on an image format information analysis result of the information extraction analysis unit and a determination result of the decoding state determination unit Determined If that, the image format information, and transmits to the display processing unit creates the storage location of the turbulence are decoded image and the image display information added freeze on information in the decoded image memory.

Preferably, the display processing unit outputs the previous output video signal as the current output video signal when freeze-on information is included in the image display information.
Further preferably, when the image display information includes freeze-off information, the display processing unit performs the display processing on the output video signal obtained by displaying the decoded image at the storage location in the image display information. Display processing.

  According to a fourth aspect of the present invention, there is provided a video decoding / playback apparatus that decodes and plays back a video signal, and extracts and analyzes image format information necessary for decoding the video signal; A decoding unit that decodes a video signal based on image format information, a decoding state determination unit that determines whether the decoded image of the decoding unit is correctly decoded, and a decoded image that is decoded by the decoding unit A decoded image memory for storing the image signal, and a predetermined process including an output restriction process for restricting the video output at least during a period in which the decoded image cannot be correctly displayed with respect to the decoded image. A display processing unit that outputs, and an output restriction determination unit that determines output restriction control of an output video signal of the display processing unit, wherein the output restriction determination unit is an image format information analysis result of the information extraction analysis unit And the decryption state When it is determined that the decoded image of the decoding unit is disturbed based on the determination result of the fixed unit, the storage location of the disturbed decoded image in the decoded image memory and output restriction on information are included in the image format information Is created and transmitted to the display processing unit.

  According to a fifth aspect of the present invention, there is provided a video decoding / reproducing method for decoding and reproducing a video signal, the first step of extracting and analyzing image format information necessary for decoding the video signal, and the image A second step of decoding the video signal based on the format information; a third step of determining whether or not the decoded image of the second step is correctly decoded; and decoding the decoded image decoded by the decoding unit A fourth step of storing in the image memory; a fifth step of determining output restriction control of the output video signal; and an output restriction process for restricting video output at least during a period in which the decoded image cannot be correctly displayed with respect to the decoded image. In the sixth step of outputting a video signal subjected to the predetermined processing and the fifth step, the image format information analysis result of the first step and the third step are output. If it is determined that the decoded image in the second step is disturbed based on the determination result of the pop, the storage location of the disturbed decoded image in the decoded image memory and output restriction on information are included in the image format information. Is added to the image display information and supplied to the process of the sixth step.

  According to the present invention, output restriction information such as mute information and freeze information can be added as additional information to a decoded image in a mute process for hiding an image that cannot be normally decoded that occurs between the start and stop of a stream. Therefore, it is possible to increase the accuracy of control of mute on / off and freeze on / off in the output video signal.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
This embodiment will be described as a compressed video decoding / playback apparatus that decodes and plays back compressed image data such as digital broadcasts.

  FIG. 1 is a block diagram showing a configuration example of a compressed video decoding / playback apparatus according to the first embodiment of the present invention.

As shown in FIG. 1, the present compressed video decoding / playback apparatus 10 includes an information extraction analysis unit 11, a decoding unit 12, a decoding state determination unit 13, a decoded image memory 14, and an output video signal output restriction processing unit. Unit 15 and display processing unit 16.
In the present embodiment, the decoding state determination unit 13 is exemplified as a configuration included in the decoding unit 12, but may be configured as a separate block.

The information extraction and analysis unit 11 extracts and analyzes image formation information necessary for decoding processing such as the number of pixels and display time from the input compressed video signal SIM.
Then, the information extraction / analysis unit 11 transmits the extracted image format information to the decoding unit 12 as a signal S111, and transmits the image format information analysis result to the mute determination unit 15 as a signal S112.

The decoding unit 12 creates a decoded image based on the input video signal SIM and the image format information extracted by the information extraction analysis unit 11 and supplied as the signal S11, and stores the decoded image in the decoded image memory 14.
Furthermore, as described above, the decoding unit 12 according to the present embodiment incorporates a decoding state determination unit 13 that determines whether there is any disturbance in the decoded image.
The decoding state determination unit 13 determines whether or not the decoded image of the decoding unit 12 has been correctly decoded.
Then, the decoding unit 12 transmits the storage location of the decoded image memory 14 storing the image format information and the decoded image, and the decoding result determined by the decoding state determination unit 13 to the mute determination unit 15.
That is, the information that the decoding unit 12 transmits to the mute determination unit 15 includes image format information, decoded image storage location information, and decoding determination result information. The decoding unit 12 uses these information as a signal S121 and the mute unit 15 Send to.

The mute determination unit 15 is based on the image format information analysis result received as the signal S112 by the information extraction analysis unit 11, the image format information received as the signal S121 by the decoding unit 12, the decoded image storage location, and the decoding determination result. Image display information S151 that combines the image format information, the decoded image storage location, and the mute information as output restriction information is generated and transmitted to the display processing unit 16.
Mute information as output restriction information for restricting video output during a period in which a decoded image cannot be correctly displayed is based on the image format information analysis result received from the information extraction analysis unit 11 and the decoding result received from the decoding unit 12 Information generated by the mute determination unit 15 and used by the display processing unit 16 to determine mute processing.
The mute determination unit 15 turns on the mute information when determining that there is a disturbance in the decoded image, and turns off the mute information when determining that there is no disturbance in the decoded image.
Note that the condition for determining that the decoded image is disturbed is due to the image format information analysis result and the decoding result, and the specific contents will be described with reference to FIG.

The display processing unit 16 acquires the decoded image indicated by the decoded image storage location of the image display information from the decoded image memory 14, forms the decoded image, such as scaling and filtering of the decoded image, and outputs it as an output video signal, for example, as illustrated in FIG. Output to the display device that does not.
Here, the display processing unit 16 performs mute processing according to the image display information received from the mute determination unit 15. When the mute information is on, the display processing unit 16 outputs a mute of the formed image as an output video signal.
On the other hand, when the mute information is off in the image display information, the display processing unit 16 outputs the formed image as it is as an output video signal.

  FIG. 2 is a diagram illustrating conditions for determining that the decoded image is disturbed in the decoding state determination unit according to the present embodiment.

  Condition 1 is a condition indicating that the compressed video decoding / playback apparatus 10 is turned on and the decoding unit 12 is ready to deliver the decoded image to the display processing unit 16.

  Condition 2 is that, after a decoding stop command from a host controller (not shown) is generated in a scene such as channel switching, the decoding unit 12 passes the decoded image to the display processing unit 16 in response to a playback control command from the host controller. This is a condition that shows the state until the state in which it is possible is completed.

  The state in which the decoded image can be delivered to the display processing unit 16 described in the conditions 1 and 2 refers to waiting for the input of time information and the input of image format information, and displaying the decoded images in the display order in order to start the display processing. Refers to the state until sorting and display time.

  Condition 3 is a condition during which an input video signal is interrupted and a state in which the input video signal is interrupted is detected.

  Condition 4 is a condition in which information is discontinuous due to noise or the like in the input video signal and data continuity is lost in the input video signal.

Condition 5 is a condition when it is found that a correct decoded image cannot be ensured by the image formation information because there is no reference image before or after the image forming information even when no error occurs in the decoding unit 12.
When the conditions 1 to 5 are satisfied, the decoding state determination unit 13 determines that there is a disorder in the decoded image, and the mute determination unit 15 turns on the mute information of the image display information.

  Next, the operation of the compressed video decoding / playback apparatus according to this embodiment will be described.

The compressed digital video signal SIM is input to the information extraction analysis unit 11 and the decoding unit 12.
In the information extraction / analysis unit 11, image format information necessary for decoding such as the compression method and the number of pixels is extracted from the compressed digital video signal SIM, and the extracted image format information is sent to the decoding unit 12 as a signal S111. The image format information analysis result is transmitted to the mute determination unit 15 as a signal S112.

In the decoding unit 12, a decoded image is created based on the input video signal SIM and the image format information extracted by the information extraction / analysis unit 11 and supplied as the signal S 11, and the decoded image is stored in the decoded image memory 14. The
Further, in the decoding unit 12, the built-in decoding state determination unit 13 determines whether or not the decoded image of the decoding unit 12 has been correctly decoded. Then, the storage unit of the decoded image memory 14 storing the image format information and the decoded image, and the decoding result determined by the decoding state determination unit 13 are transmitted from the decoding unit 12 to the mute determination unit 15 as a signal S121.

In the mute determination unit 15, based on the image format information analysis result received as the signal S 112 by the information extraction analysis unit 11, the image format information received as the signal S 121 by the decoding unit 12, the decoded image storage location, and the decoding determination result. Then, image display information S151 combining the image format information, the decoded image storage location, and the mute information is generated and transmitted to the display processing unit 16.
Specifically, when the mute determination unit 15 determines that the decoded image is disturbed, the mute information is turned on. On the other hand, when it is determined that the decoded image is not disturbed, the mute information is turned off, and the display processing unit 16 is transmitted.

In the display processing unit 16, the decoded image indicated by the decoded image storage location of the image display information S 151 by the mute determination unit 15 is acquired from the decoded image memory 14, and a decoded image such as decoding image scaling and filter processing is formed.
At this time, in the case where the mute-on information is included in the image display information S151, the display processing unit 16 performs a mute process on the output video signal obtained by displaying the decoded image at the storage location in the image display information S151. Is done.
On the other hand, when the mute-off information is included in the image display information S151, the display processing unit 16 performs display processing on the output video signal obtained by displaying the decoded image at the storage location in the image display information S151. Done.

  As described above, according to the first embodiment, the information extraction analysis unit 11 that extracts and analyzes the image format information necessary for decoding the video signal, and the video signal is decoded based on the image format information. A decoding unit 12 for decoding, a decoding state determination unit 13 for determining whether or not the decoded image of the decoding unit has been correctly decoded, a decoded image memory 14 for storing the decoded image decoded by the decoding unit 12, Predetermined processing including at least mute processing can be performed on the decoded image, the display processing unit 16 outputs a video signal subjected to the predetermined processing, and mute determination for determining mute control of the output video signal of the display processing unit 16 The mute determination unit 15 determines that the decoded image of the decoding unit 12 is disturbed based on the image format information analysis result of the information extraction analysis unit 11 and the determination result of the decoding state determination unit 13. Then As shown in FIG. 3, since the display information is created and transmitted to the display processing unit 16 by adding the storage location of the distorted decoded image in the decoded image memory 14 and the mute-on information to the format information. In the mute process for hiding images that cannot be normally decoded that occurs between the start and stop of the stream, mute information can be added as additional information for the decoded image, and mute on / off control in the output video signal There is an advantage that accuracy can be increased.

  FIG. 4 is a block diagram showing a configuration example of a compressed video decoding / playback apparatus according to the second embodiment of the present invention.

  The compressed video decoding / reproducing apparatus 10A of the second embodiment is different from the compressed video signal reproducing apparatus 10 of the first embodiment in that the mute information in the first embodiment is information indicating an on / off state of mute. However, in the second embodiment, the decoding state determination unit 13A changes the value only at the time of mute on / off switching, and treats it as mute state switching flag information, so that the display processing unit changes the mute state. It is to be made to toggle.

The mute determination unit 15A of the second embodiment determines whether or not the disordered state has changed from the previous decoded image based on the image format information analysis result of the information extraction analysis unit 11 and the determination result of the decoding state determination unit 13A. Determine whether.
If it is determined that the disturbance state has changed, the mute determination unit 15A creates the image display information S151A to which the decoded image storage location and the mute switching information are added, and transmits the image display information S151A to the display processing unit 16A.
When the display processing unit 16A receives the image display information S151A including the mute switching information from the mute determination unit 15A, the display processing unit 16A mutes the output video signal obtained by performing the display processing on the decoded image at the storage location in the image display information. Toggle the presence or absence of control.

  According to the second embodiment, the same effect as the effect of the first embodiment described above can be obtained.

  FIG. 5 is a block diagram showing a configuration example of a compressed video decoding / playback apparatus according to the third embodiment of the present invention.

  The compressed video decoding / reproducing apparatus 10B of the third embodiment is different from the compressed video signal reproducing apparatus 10 of the first embodiment in that output regulation for displaying the same image without updating the decoded image instead of the mute information. By using the freeze information as information, the display processing unit displays the last image decoded normally as a still image, assuming that the image is disturbed during the freeze-on state.

  Therefore, in the third embodiment, a freeze determination unit 17 that determines the freeze control of the output video signal is provided instead of the mute determination unit.

When the freeze determination unit 17 determines that the decoded image of the decoding unit 12 is disturbed based on the image format information analysis result of the information extraction analysis unit 11 and the determination result of the decoding state determination unit 13, the freeze determination unit 17 decodes the image format information. Image display information S171 to which the storage location of the disturbed decoded image in the image memory 14 and freeze-on information are added is created and transmitted to the display processing unit 16B.
When the freeze-on information is included in the image display information S171, the display processing unit 16B outputs the output video signal output immediately before as the current output video signal.
On the other hand, when freeze-off information is included in the image display information S171, the display processing unit 16B performs display processing on the output video signal obtained by processing the decoded image at the storage location in the image display information S171. Do.

  According to the third embodiment, freeze information can be added as additional information to a decoded image in a freeze process for hiding an image that cannot be normally decoded that occurs between the start and stop of a stream, and an output video signal The accuracy of freeze-on / off control in the can be improved.

It is a block diagram which shows the structural example of the compressed video decoding / reproducing apparatus concerning the 1st Embodiment of this invention. It is a figure which shows the conditions which judge that the decoding image is disordered in the decoding state determination part which concerns on this embodiment. It is a figure for demonstrating the effect of 1st Embodiment. It is a block diagram which shows the structural example of the compressed video decoding / reproducing apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structural example of the compressed video decoding / reproducing apparatus which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Compression video decoding reproduction | regeneration apparatus, 11 ... Information extraction analysis part, 12 ... Decoding part, 13, 13A ... Decoding state determination part, 14 ... Decoded image memory, 15, 15A ... mute processing unit (output regulation processing unit), 16, 16A, 16B ... display processing unit, 17 ... freeze determination unit (output regulation processing unit).

Claims (15)

A video decoding / playback apparatus for decoding and playing back a video signal,
An information extraction analysis unit that extracts and analyzes image format information necessary for decoding the video signal;
A decoding unit for decoding a video signal based on the image format information;
A decoding state determination unit that determines whether or not the decoded image of the decoding unit is correctly decoded;
A decoded image memory for storing the decoded image decoded by the decoding unit;
A display processing unit capable of performing a predetermined process including at least a mute process on the decoded image and outputting a video signal subjected to the predetermined process;
A mute determination unit that determines mute control of the output video signal of the display processing unit,
When the mute determination unit determines that the decoded image of the decoding unit is disturbed based on the image format information analysis result of the information extraction analysis unit and the determination result of the decoding state determination unit, the image format information includes: A video decoding / playback apparatus that creates image display information to which the disordered decoded image storage location and mute-on information are added in the decoded image memory and transmits the image display information to the display processing unit. When the mute-on information is added to the image display information, the display processing unit performs a mute on the video signal to be output after the decoded image at the storage location in the image display information is displayed. The video decoding / playback apparatus according to claim 1, wherein the process is performed. When the mute-off information is added to the image display information, the display processing unit displays the decoded image at the storage location in the image display information for the output video signal to be output. The video decoding / playback apparatus according to claim 1, wherein the process is performed. When the mute-off information is added to the image display information, the display processing unit displays the decoded image at the storage location in the image display information for the output video signal to be output. The video decoding / playback apparatus according to claim 2, wherein the processing is performed. A video decoding / playback apparatus for decoding and playing back a video signal,
An information extraction analysis unit that extracts and analyzes image format information necessary for decoding the video signal;
A decoding unit for decoding a video signal based on the image format information;
A decoding state determination unit that determines whether or not the decoded image of the decoding unit is correctly decoded;
A decoded image memory for storing the decoded image decoded by the decoding unit;
A display processing unit capable of performing a predetermined process including at least a mute process on the decoded image and outputting a video signal subjected to the predetermined process;
A mute determination unit that determines mute control of the output video signal of the display processing unit,
When the mute determination unit determines that the disordered state has changed from the previous decoded image based on the image format information analysis result of the information extraction analysis unit and the determination result of the decoding state determination unit, the mute determination unit A video decoding / playback apparatus that creates image display information to which a storage location and mute switching information are added and transmits the image display information to the display processing unit. When the display processing unit receives the image display information including mute switching information from the mute determination unit, the display processing unit mutes the output video signal obtained by performing display processing on the decoded image at the storage location in the image display information. The video decoding / playback apparatus according to claim 5, wherein the presence / absence of control is toggled. A video decoding / playback apparatus for decoding and playing back a video signal,
An information extraction analysis unit that extracts and analyzes image format information necessary for decoding the video signal;
A decoding unit for decoding a video signal based on the image format information;
A decoding state determination unit that determines whether or not the decoded image of the decoding unit is correctly decoded;
A decoded image memory for storing the decoded image decoded by the decoding unit;
A display processing unit capable of performing predetermined processing including at least freeze processing on the decoded image, and outputting a video signal subjected to the predetermined processing;
A freeze determination unit for determining freeze control of the output video signal,
When the freeze determination unit determines that the decoded image of the decoding unit is disturbed based on the image format information analysis result of the information extraction analysis unit and the determination result of the decoding state determination unit, the image format information includes: A video decoding / playback apparatus that creates image display information to which the disordered decoded image storage location and freeze-on information are added in the decoded image memory and transmits the image display information to the display processing unit. The video decoding / playback apparatus according to claim 7, wherein the display processing unit outputs the previous output video signal as the current output video signal when freeze-on information is included in the image display information. When the freeze display information is included in the image display information, the display processing unit performs a display process on the output video signal obtained by displaying the decoded image at the storage location in the image display information. The video decoding / playback apparatus according to claim 7. When the freeze display information is included in the image display information, the display processing unit performs a display process on the output video signal obtained by displaying the decoded image at the storage location in the image display information. The video decoding / playback apparatus according to claim 8. A video decoding / playback apparatus for decoding and playing back a video signal,
An information extraction analysis unit that extracts and analyzes image format information necessary for decoding the video signal;
A decoding unit for decoding a video signal based on the image format information;
A decoding state determination unit that determines whether or not the decoded image of the decoding unit is correctly decoded;
A decoded image memory for storing the decoded image decoded by the decoding unit;
A predetermined processing including an output restriction process for restricting video output during a period in which the decoded image cannot be displayed correctly at least for the decoded image, and a display processing unit that outputs a video signal subjected to the predetermined process;
An output restriction determination unit for determining output restriction control of the output video signal of the display processing unit,
When the output restriction determination unit determines that the decoded image of the decoding unit is disturbed based on the image format information analysis result of the information extraction analysis unit and the determination result of the decoding state determination unit, the output restriction determination unit includes the image format information. A video decoding / playback apparatus that creates image display information to which the disordered decoded image storage location and output restriction ON information are added in the decoded image memory and transmits the image display information to the display processing unit. When the output restriction ON information is added to the image display information, the display processing unit displays the decoded image at the storage location in the image display information and outputs the decoded video signal. The video decoding / playback apparatus according to claim 11, wherein output restriction processing is performed. When the output restriction off information is added to the image display information, the display processing unit displays the decoded image at the storage location in the image display information and outputs the decoded video signal. The video decoding / playback apparatus according to claim 11, wherein display processing is performed. When the output restriction off information is added to the image display information, the display processing unit displays the decoded image at the storage location in the image display information and outputs the decoded video signal. The video decoding / playback apparatus according to claim 12, wherein display processing is performed. A video decoding and reproducing method for decoding and reproducing a video signal,
A first step of extracting and analyzing image format information necessary for decoding the video signal;
A second step of decoding a video signal based on the image format information;
A third step of determining whether or not the decoded image of the second step has been correctly decoded;
A fourth step of storing the decoded image decoded by the decoding unit in a decoded image memory;
A fifth step of determining output restriction control of the output video signal;
A sixth step of outputting a video signal that has been subjected to a predetermined process, capable of a predetermined process including an output restriction process for restricting video output at least during a period in which the decoded image cannot be correctly displayed with respect to the decoded image;
In the fifth step, when it is determined that the decoded image in the second step is disturbed based on the image format information analysis result in the first step and the determination result in the third step, the image format information includes the A video decoding / reproducing method for generating image display information to which the storage location of the disturbed decoded image in the decoded image memory and output restriction ON information are added and supplying the display information to the process of the sixth step.

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