JP2015041790A - Transcoding device and transcoding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transcoding device constituted of one decoder, when transcoding both or any one of video information and audio information of the same coding system simultaneously by a plurality of coding systems.SOLUTION: A transcoding device includes one AVC-Intra decoder 12 for decoding information of a coding system of transcoding source, e.g., AVC-Intra system, and two encoders, e.g., an MPEG-2 encoder 14 and an H.264 encoder 24, as a plurality of encoders for converting into information of a coding system of transcoding destination. By inputting video information 13 decoded by the AVC-Intra decoder 12 while branching to the two encoders of MPEG-2 encoder 14 and H.264 encoder 24, video information 11 encoded by the AVC-Intra system is output while being converted into video information 15 encoded by the MPEG-2 system and video information 25 encoded by the H.264 system.

Description

  The present invention relates to a transcoding device and a transcoding method, and more particularly to a transcoding device and a transcoding method for converting a coding method of video information and audio information.

  Various standards have been established for recording information such as digital broadcast programs on a large-capacity optical disk recording medium such as a DVD (Digital Versatile Disc) and a BD (Blu-ray (registered trademark) Disc). For example, as a standard for recording video information, ITU-T and ISO are ITU-TH. 262 | MPEG-2 system (MPEG: registered trademark) standardized as ISO / IEC 13818-2, ITU-T H.264 H.264 | ISO / IEC 14496-10 There are H.264 systems and standards specific to video equipment manufacturers derived from these international standards, such as the AVC-Intra system (AVC-Intra: registered trademark) of Panasonic Corporation. In addition, as a standard for recording audio information, there are an AAC (Advanced Audio Coding) method, an AC3 (Audio Code number 3) method, and the like.

  Therefore, as described in, for example, Japanese Patent Application Laid-Open No. 2004-343592 “Transcode” in Patent Document 1, when video information encoded by different encoding methods is to be reproduced, It is necessary to convert the video information of the encoding method recorded by the video device on the side into video information of the encoding method on the own device side and reproduce it on the own device side. As described above, converting video information of a certain encoding method into video information of a different encoding method is referred to as “transcoding”. For example, AVC-Intra video information is converted into MPEG-2 video information. The case of converting to video information of the H.264 format corresponds to “transcode”. A device having a transcoding function is called a transcoding device.

  FIG. 3 is an internal block diagram showing an outline of a conventional transcoding device. The conventional transcoding device shown in FIG. 3 is configured so that a circuit configuration corresponding to a combination of a transcoding source and a transcoding destination for each encoding method is a transcoding unit. That is, as shown in FIG. 3A, transcode (1) 210 for converting video information 211 encoded by the AVC-Intra system into video information 215 encoded by the MPEG-2 system, As shown in FIG. 3B, the video information 221 encoded by the AVC-Intra system is converted into the H.264 format. A transcode (2) 220 to be converted into video information 225 encoded by the H.264 system is shown.

  In the transcode (1) 210 of FIG. 3A, after the input video information 211 encoded by the AVC-Intra method is once decoded into the original video information by the AVC-Intra decoder 212, The decoded video information 213 is converted into video information 215 encoded by the MPEG-2 system by the MPEG-2 encoder 214 and output. In addition, in the transcode (2) 220 in FIG. 3B, the input video information 221 encoded by the AVC-Intra system is once decoded into the original video information by the AVC-Intra decoder 222. Thereafter, the decoded video information 223 is stored in H.264. H.264 encoder 224 The video information 225 encoded by the H.264 system is converted and output.

  As described above, the conventional transcoding apparatus is different from a decoder that decodes video information of an encoding method input as transcoding source information into original video information, and the decoded video information as transcoding destination information. The encoder for converting into the video information of the encoding method is separately provided as a transcode unit corresponding to the combination of the respective encoding methods.

JP 2004-343592 A (page 2-5)

  However, in the case of a conventional transcoding device, when a plurality of transcoding operations for converting into video information of a plurality of different encoding schemes are performed at the same time, input encoded video information is common. In addition, a plurality of decoders having the same decoding function (that is, a function of decoding video information encoded by the same encoding method into original video information) may be provided in accordance with the number of transcoding destination encoding methods. As a result, the cost increased and the processing was wasted. For example, when transcoding of N (N: a positive integer greater than or equal to 2) encoding method is to be realized at the same time, N decoders are used to input video information of a certain encoding method. It becomes necessary.

  For example, in the case of the transcoding device of FIG. 3, even when video information encoded by the AVC-Intra method of the same encoding method is input, depending on the encoding method of the transcoding destination, The transcode (1) 210 in FIG. Two transcoding devices, transcode (2) 220 in FIG. 3B that transcodes to H.264 video information, are used, and MPEG-2 encoder 214 in MPEG-2 encoder 214 in transcode (1) 210. In the AVC-Intra decoder 212 of FIG. H.264 encoder 224 provides H.264. Two decoders are required, the AVC-Intra decoder 222 of FIG. 3B used for transcoding to H.264 video information.

  It should be noted that such a transcoding device is not limited to the case of video information, and it is completely possible to transcode audio information or to transcode both video information and audio information. It is the same.

(Object of the present invention)
The present invention has been made in view of such circumstances, and a plurality of decoders are used when simultaneously transcoding video information and / or audio information of the same encoding method into a plurality of encoding methods. An object of the present invention is to provide a transcoding device and a transcoding method configured by only one decoder.

  In order to solve the above-described problems, the transcoding apparatus and transcoding method according to the present invention mainly adopt the following characteristic configuration.

  (1) A transcoding device according to the present invention is a transcoding device that converts information encoded by a certain encoding method into information of another encoding method having a different encoding method. When converting information of a specific coding scheme into information of a plurality of coding schemes as a transcoding destination, a transcoding unit is used to decode information of a specific coding scheme of the transcoding source. One decoder and a plurality of encoders for converting into information of the encoding scheme as the transcoding destination, and branching the information decoded by the decoder to each of the plurality of encoders It is characterized by being configured to input.

  (2) A transcoding device according to the present invention is a transcoding device that converts information encoded by a certain encoding method into information of another encoding method having a different encoding method. When information of a plurality of encoding methods exists as transcoding source information for conversion into information of a specific encoding method, information on a specific encoding method of the transcoding destination as a transcoding unit And a plurality of decoders for decoding the information of the encoding scheme as the transcoding source, and the information decoded by each of the plurality of decoders It is configured to input to the encoder.

  (3) A transcoding method according to the present invention is a transcoding method for converting information encoded by a certain encoding method into information of another encoding method having a different encoding method, When converting information of a specific encoding scheme into information of a plurality of encoding schemes as a transcoding destination, the information of the specific encoding scheme of the transcoding source is decoded as a transcoding unit. And a plurality of encoders for converting the information into the encoding scheme that is the transcoding destination, and the information decoded by the decoder is transmitted to each of the plurality of encoders. It is characterized by branching and inputting.

  (4) A transcoding method according to the present invention is a transcoding method for converting information encoded by a certain encoding method into information of another encoding method having a different encoding method, When information of a plurality of encoding methods exists as transcoding source information for conversion into information of a certain specific encoding method, the specific encoding method of the transcoding destination as a transcoding unit And a plurality of decoders for decoding the information of the encoding system that is the transcoding source, each of which is decoded by each of the plurality of decoders. The information is input to the encoder.

  According to the transcoding device and transcoding method of the present invention, the following effects can be obtained.

  That is, when transcoding information of the same coding scheme into information of one or more coding schemes, one transcoding unit is used regardless of the number of transcoding destination coding schemes. A configuration including only a decoder can be adopted, and it is not necessary to prepare a plurality of decoders as in the conventional transcoding device, and not only an economical configuration can be achieved, but also the amount of processing can be reduced. Reduction, speeding up of processing, and reduction of power consumption can also be achieved.

It is an internal block block diagram which shows an example of the internal structure of the transcoding apparatus by this invention. It is an internal block block diagram which shows the other example different from FIG. 1 of the internal structure of the transcoding apparatus by this invention. It is an internal block block diagram which shows the outline | summary of the conventional transcoding apparatus.

  Preferred embodiments of a transcoding device and a transcoding method according to the present invention will be described below with reference to the accompanying drawings.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. In the present invention, when transcoding of a plurality of encoding methods is performed simultaneously, when encoded information (video information or audio information or video information and audio information) input for transcoding is common, After decoding into original information by one decoder, the decoded original information is distributed and input to a plurality of encoders (encoders for encoding into respective encoding scheme information of transcoding destinations). By adopting such a configuration, the main feature is to reduce the number of decoders.

  That is, according to the present invention, there is only one decoder for decoding the information of the same coding method into the original information, and the output data of the decoder is distributed to each coding method serving as a transcoding destination. Are input to each of a plurality of encoders that perform the encoding. Therefore, when simultaneously transcoding to N (N: a positive integer greater than or equal to 2) encoding schemes as transcoding destinations, when inputting video information of a certain encoding scheme, It is sufficient to prepare only one decoder. As a result, the number of decoders can be greatly reduced compared to the case of a conventional transcoding device that requires N decoders, and an economical transcoding device can be configured.

(Configuration example of embodiment of the present invention)
Next, a configuration example of the transcoding device according to the present invention will be described in detail with reference to FIG. FIG. 1 is a block diagram showing an example of an internal configuration of a transcoding device according to the present invention. Video information encoded by the AVC-Intra method is converted into video information encoded by the MPEG-2 method. H. An example in which transcoding is performed simultaneously with video information encoded in the H.264 format is shown.

  In the transcoding device 10 shown in FIG. 1, the input video information 11 encoded by the AVC-Intra method is once decoded into the original video information by the AVC-Intra decoder 12, and then branched into two. One decoded video information 13 is distributed to the MPEG-2 encoder 14, and the other decoded video information 13 is set to H.264. H.264 encoder 24.

  The MPEG-2 encoder 14 converts one of the decoded video information 13 that has been distributed into video information 15 encoded by the MPEG-2 system and outputs the video information 15. H. The H.264 encoder 24 converts the other decoded video information 13 that has been distributed into H.264. It is converted into video information 25 encoded by the H.264 system and output.

  With the configuration as described above, when the encoding method of the input video information, for example, the AVC-Intra method is the same, even if it is converted into a plurality of transcoding destination encoding methods, It is sufficient to provide only one decoder, for example, an AVC-Intra decoder 12 for decoding the video information. Then, the video information output from the decoder, for example, the AVC-Intra decoder 12, is converted into a number corresponding to the number of transcoding destination encoding methods, for example, MPEG-2 method and H.264. For example, an MPEG-2 encoder 14 and an H.264 encoder for branching into two corresponding to the encoding schemes of the H.264 scheme and encoding into the respective transcoding destination encoding schemes. H.264 encoder 24 may be distributed and supplied.

  As a result, the information on the specific encoding method of the transcode source is required even when transcoding is performed simultaneously on the information on N (N: positive integer of 2 or more) encoding methods. The number of decoders is only one, which can be significantly reduced from N in the case of a conventional transcoding device. For example, in the transcoding device 10 as shown in FIG. 1, the number of decoders can be reduced from two to one as compared with the conventional transcoding device shown in FIG.

  The above-described configuration is a transcoding device prepared as one transcoding unit, and information on a specific encoding method of a transcoding source is converted into information on a plurality of encoding methods as transcoding destinations. It was the case of converting and outputting. That is, for each encoding method of input video information, one decoder for decoding the encoding method is provided, and the video information decoded by the decoder is converted into the encoding method of each transcoding destination. The transcoding device configured to distribute and supply to a plurality of encoders for encoding video information has been described. In the example of the transcoding device 10 in FIG. 1, one AVC-Intra decoder 12 is provided, and video information decoded by the AVC-Intra decoder 12 is converted into MPEG-2 encoder 14 and H.264. H.264 encoder 24 is distributed and supplied.

  However, the configuration of the present invention is not limited to that described above. In some cases, in a transcoding device prepared as one transcoding unit, information of a plurality of encoding methods as transcoding source information for conversion into information of a specific encoding method of a transcoding destination It is also possible to adopt a configuration that can cope with the case where there is. That is, for each transcoding device, the number of decoders and encodings may be reversed from the case of FIG. 1, and may be configured by a plurality of decoders and one encoder. That is, as shown in FIG. 2, a plurality of decoders for decoding each of video information of a plurality of encoding methods as transcoding sources into original video information, and video information decoded by the respective decoders are input. Then, any one of the plurality of input video information may be selected and configured by one encoder for encoding video information of a certain transcoding destination encoding method. .

  FIG. 2 is an internal block configuration diagram showing another example of the internal configuration of the transcoding device according to the present invention different from FIG. The transcoding device in FIG. 2 receives two pieces of video information, an AVC-Intra video information and an MPEG-2 video information, as an encoding method as a transcoding source, and inputs one of the two videos. H. Information 2 illustrates an example of a configuration in which the video information is converted into H.264 video information and output.

  In the transcoding device 110 shown in FIG. 2, the input video information 111 encoded by the AVC-Intra method is once decoded into the original video information by the AVC-Intra decoder 113, and is also input. The video information 112 encoded by the MPEG-2 system is decoded into the original video information by the MPEG-2 decoder 114 and then decoded by the AVC-Intra decoder 113 and the MPEG-2 decoder. The two pieces of video information of the video information 116 decoded at 114 are converted into H.264. H.264 encoder 117.

  H. The H.264 encoder 117 is arbitrarily designated from the outside as the video information of the transcoding source among the video information 115 decoded by the AVC-Intra decoder 113 and the video information 116 decoded by the MPEG-2 decoder 114. Any one of the video information is selected. It is converted into video information 118 encoded by the H.264 system and output as transcoded video information.

  According to the configuration as described above, the encoding method of video information to be transcoded, for example, H.264. If the H.264 system is the same, even if there are a plurality of encoding systems to be converted as transcoding sources, the video information is encoded into transcoded video information. Encoders, e.g. Only one H.264 encoder 117 is required. Then, the information output from each decoder for decoding the video information of the encoding method of the transcode source, for example, the AVC-Intra decoder 113 and the MPEG-2 decoder 114, is sent to the specific transcode destination required. An encoder for converting into an encoding system, such as H.264. H.264 encoder 117 may be supplied.

  In the above description, information to be transcoded is represented by AVC-Intra, MPEG-2, H.264, and H.264. The case of video information encoded by the H.264 system has been described as an example, but it goes without saying that the present invention is not limited to this case. For example, the aforementioned AVC-Intra system, MPEG-2 system, H.264, etc. Even video information encoded by an encoding method other than the video information encoded by the H.264 method can be handled in exactly the same way. Also, not only video information but also video information including audio information can be transcoded in the same way as when only video information is present, and even video information without audio information can be used. Absent.

(Explanation of effect of embodiment)
As described above in detail, in the present embodiment, when transcoding the information of the same encoding method into information of one or a plurality of encoding methods, the code of the transcoding destination is used as a transcoding unit. Regardless of the number of encoding methods, a configuration having only one decoder can be adopted, and it is not necessary to prepare a plurality of decoders as in the conventional transcoding device, and the configuration is economical. In addition, the processing amount can be reduced, the processing speed can be increased, and the power consumption can be reduced. Furthermore, even in the case where any one of a plurality of encoding scheme information is selected and transcoded to the same encoding scheme information, a configuration including only one encoder as a transcoding unit should be adopted. Is also possible.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely examples of the present invention and do not limit the present invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

10 transcoding device 11 video information encoded by AVC-Intra system 12 AVC-Intra decoder 13 decoded video information 14 MPEG-2 encoder 15 video information 24 encoded by MPEG-2 system H.264 encoder 25 H.264. Video information 110 encoded in H.264 format Transcoding device 111 Video information encoded in AVC-Intra format 113 AVC-Intra decoder 112 Video information encoded in MPEG-2 format 114 MPEG-2 decoder 115 Decoded video information 116 Decoded video information 117 H.264 encoder 118 H.264. Video information 210 encoded in H.264 format Transcode (1)
211 Video information encoded by the AVC-Intra system 212 AVC-Intra decoder 213 Decoded video information 214 MPEG-2 encoder 215 Video information encoded by the MPEG-2 system 220 Transcode (2)
221 Video information encoded by AVC-Intra system 222 AVC-Intra decoder 223 Decoded video information 224 H.264 encoder 225 Video information encoded in H.264 format

Claims (6)

  In a transcoding device that converts information encoded by a certain encoding method into information of another encoding method having a different encoding method, information on a specific encoding method that is a transcoding source is transcoded. When converting into information of a plurality of encoding schemes as a destination, as a transcoding unit, one decoder for decoding information of a certain encoding scheme of the transcoding source, the transcoding destination, And a plurality of encoders for converting the information into the encoding method, and the information decoded by the decoder is branched and input to each of the plurality of encoders. Transcoding device.   In a transcoding device that converts information encoded by a certain encoding method into information of another encoding method having a different encoding method, in order to convert the information into information of a specific encoding method at a transcoding destination If there is information of a plurality of encoding methods as transcoding source information, one encoder for converting into information of a specific encoding method of the transcoding destination as a transcoding unit; A plurality of decoders for decoding the information of the encoding scheme as the transcoding source, and configured to input information decoded by each of the plurality of decoders to the encoder A characteristic transcoding device.   The information as the transcoding source and the transcoding destination is any one of video information, audio information, or information of both video information and audio information. The transcoding device as described.   A transcoding method for converting information encoded by a certain encoding method into information of another encoding method having a different encoding method, and information on a specific encoding method of a transcoding source When converting into information of a plurality of encoding schemes as a transcoding destination, one transcoder for decoding information of a specific encoding scheme of the transcoding source as a transcoding unit, and the transcoding A plurality of encoders for converting into information of a previous encoding system, and the information decoded by the decoder is branched and input to each of the plurality of encoders Code method.   A transcoding method for converting information encoded by a certain encoding method into information of another encoding method having a different encoding method, and converting the information into information of a specific encoding method at a transcoding destination When there is information of a plurality of encoding methods as transcoding source information, one encoder for converting into information of a specific encoding method of the transcoding destination as a transcoding unit And a plurality of decoders for decoding the information of the encoding scheme that is the transcoding source, and the information decoded by each of the plurality of decoders is input to the encoder A transcoding method characterized by:   6. The information as the transcoding source and the transcoding destination is any one of video information, audio information, or both information of video information and audio information. The transcoding method as described.

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