JP2012249190A - Video server and mxf file reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video server capable of outputting a time code even when it is unknown whether a time code is superimposed on a system area or an ancillary area of a data body.
A video server includes a recording analysis unit, a storage unit, a decoding unit, a determination unit, and a reproduction analysis unit. The recording analysis unit analyzes the system area and the ancillary area of the MXF file and creates management information indicating which time code is included. The accumulation unit accumulates the analyzed MXF file and management information. The decryption unit decrypts the data body of the MXF file read from the storage unit. The determination unit refers to the management information and determines in which of the system area and the ancillary area the time code is superimposed. The reproduction analysis unit reads the time code from the system area or the ancillary area based on the determination result. The multiplexing unit multiplexes and outputs the decoded data body and the read time code.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a video server and MXF file playback method for recording material data in a file format according to the MXF (Material eXchange Format) standard and playing back the recorded MXF file.

  The MXF file includes a header part, a body part, and a footer part. The header portion is resident at the top of the MXF file and includes metadata. In the body portion, data bodies such as video data and audio data are stored for each frame. The footer part is located at the end of the MXF file and records additional information.

  By the way, when trying to output a time code during the reproduction of an MXF file, a method of generating a time code at the time of reproduction by incrementing each reproduction from the time code superimposed on the header part and a data body of the body part are added. There are two types: a method of outputting the time code as it is. When superimposing the time code added to the data body of the body part, it is customary to superimpose the time code on the system area added to the data body.

  However, when a time code is to be added to the data body of the body portion, the time code can be superimposed on the ancillary area added to the data body. However, whether the time code is superimposed on the system area or the ancillary area is not clearly defined. Therefore, in the conventional video server, the time code is read out by referring only to the system area according to the custom.

JP 2009-55398 A

  As described above, in the conventional video server, when the time code added to the data body of the body part of the MXF file is to be output through, it is customary to refer only to the system area added to the data body. is there. Therefore, when the time code is superimposed only on the ancillary area, the time code cannot be detected and the time code cannot be output.

  Therefore, the purpose is to reproduce a video server and MXF file that can output a time code even if it is unknown whether the time code is superimposed on the system area or ancillary area added to the data body. It is to provide a method.

  According to the embodiment, a video server that stores an MXF file in which a data body is stored in a body part for each frame and a system area and an ancillary area are included in the body part for each data body includes a recording analysis unit, an accumulation unit Unit, a decoding unit, a determination unit, and a reproduction analysis unit. The recording analysis unit analyzes the system area and the ancillary area of the MXF file, and writes an analysis result indicating whether the time code is included in the system area or the ancillary area in the management information of the MXF file. The accumulation unit accumulates the MXF file from the recording analysis unit. The decryption unit decrypts the data body of the MXF file read from the storage unit. The determination unit refers to the analysis result written in the management information of the MXF file read from the storage unit, and determines whether the time code is superimposed on the system area or the ancillary area of the MXF file. The reproduction analysis unit reads the time code from the system area or ancillary area of the MXF file read from the storage unit based on the determination result of the determination unit. The multiplexing unit multiplexes the data body decoded by the decoding unit and the time code from the reproduction analysis unit, and outputs the result as a baseband signal.

It is a block diagram which shows the function structure of the video server which concerns on 1st Embodiment. 2 is a flowchart showing a time code reading process by a reproduction analysis unit of the video server of FIG. It is a figure which shows the example of the stream structure of the MXF file supplied to the video server of FIG. It is a figure which shows the example of the stream structure of the MXF file supplied to the video server of FIG. It is a figure which shows the example of the stream structure of the MXF file supplied to the video server of FIG. It is a block diagram which shows the function structure of the video server which concerns on 2nd Embodiment. It is a figure which shows the example at the time of outputting the time code added to the data main body. It is a figure which shows the example at the time of outputting the time code superimposed on metadata.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a functional configuration of the video server 10 according to the first embodiment. A video server 10 shown in FIG. 1 includes a recording analysis unit 11, a storage unit 12, and a decoder 13.

  The recording analysis unit 11 receives the MXF file. The MXF file includes a header part, a body part, and a footer part. The header portion is resident at the top of the MXF file and includes metadata in which management information and the like are recorded. In the body portion, data bodies such as video data and audio data are stored for each frame. The body portion includes a system area and an ancillary area. A time code is superimposed on at least one of the system area and the ancillary area. The footer part is located at the end of the MXF file and records additional information.

  The recording analysis unit 11 analyzes the system area and the ancillary area of the body part of the received MXF file, and determines whether the time code is superimposed on the system area or the ancillary area. The recording analysis unit 11 writes the analysis result of whether the time code is superimposed on the system area or the ancillary area in the metadata of the header part as a part of the management information. The recording analysis unit 11 outputs the MXF file in which the analysis result is written to the storage unit 12.

  The accumulation unit 12 stores the MXF file from the recording analysis unit 11.

  Further, the storage unit 12 reads the MXF file to be stored in response to the read instruction. The accumulation unit 12 outputs the read MXF file to the decoder 13.

  The decoder 13 includes a separation unit 131, a decoding unit 132, a determination unit 133, a reproduction analysis unit 134, and a multiplexing unit 135.

  The separation unit 131 separates the MXF file read from the storage unit 12 into metadata, data superimposed on the system area and data superimposed on the ancillary area, and data bodies such as video data and audio data. . The separation unit 131 outputs the data body to the decryption unit 132. Further, the separation unit 131 outputs the metadata to the determination unit 133, and outputs the data superimposed on the system area and the data superimposed on the ancillary area to the reproduction analysis unit 134.

  The decoding unit 132 decodes the data body from the separation unit 131 by a decoding method corresponding to the data body encoding method. For example, when the data body is encoded based on the MPEG-2 standard, the decoding unit 132 decodes the data body based on the MPEG-2 standard. Decoding section 132 outputs the decoded data to multiplexing section 135.

  The determination unit 133 refers to the analysis result written in the metadata, and determines whether the time code is superimposed on the system area or the ancillary area. The determination unit 133 outputs the determination result to the reproduction analysis unit 134.

  The reproduction analysis unit 134 reads the time code from the system area or the ancillary area based on the determination result of the determination unit 133. The reproduction analysis unit 134 outputs the read time code to the multiplexing unit 135.

  For example, when the determination unit 133 determines that the time code is superimposed only on the system area, the reproduction analysis unit 134 reads the time code superimposed on the system area. If the determination unit 133 determines that the time code is superimposed only on the ancillary area, the reproduction analysis unit 134 reads the time code superimposed on the ancillary area. When the determination unit 133 determines that the time code is superimposed on both the system area and the ancillary area, the playback analysis unit 134 determines whether the time code is superimposed on one area according to a preset priority. Is read.

  The multiplexing unit 135 multiplexes the decoded data from the decoding unit 132 with the time code from the reproduction analysis unit 134 to create a baseband signal. Multiplexer 135 outputs the baseband signal to the subsequent stage.

  Next, a time code reading process performed by the playback analysis unit 134 of the video server 10 configured as described above will be described in accordance with the processing procedure of the playback analysis unit 134. FIG. 2 is a flowchart showing time code reading processing by the reproduction analysis unit 134 of the video server 10 according to the first embodiment. 3 to 5 are diagrams illustrating examples of MXF file stream configurations.

  First, the reproduction analysis unit 134 determines whether the time code is superimposed on both the system area and the ancillary area based on the determination result from the determination unit 133 (step S21). As shown in FIG. 5, when the time code is superimposed on both the system area and the ancillary area of the MXF file (Yes in step S21), the reproduction analysis unit 134 gives priority to the time code superimposed on the system area. Whether or not (step S22). When the time code is superimposed on the system area or ancillary area of the MXF file (No in step S21), the reproduction analysis unit 134 determines whether the time code is superimposed only on the system area (step S23). ).

  In step S22, when it is set in advance to prioritize the time code superimposed on the system area (Yes in step S22), the reproduction analysis unit 134 reads the time code superimposed on the system area, and reads the read time code. The code is output to the multiplexing unit 135 (step S24). When prioritizing the time code superimposed on the ancillary area is preset (No in step S22), the reproduction analysis unit 134 reads the time code superimposed on the ancillary area and multiplexes the read time code into the multiplexing unit It outputs to 135 (step S25).

  In step S23, when it is determined that the time code is superimposed only on the system area as shown in FIG. 3 (Yes in step S23), the reproduction analysis unit 134 reads and reads the time code superimposed on the system area. The time code is output to the multiplexing unit 135 (step S26). If it is not determined that the time code is superimposed only on the system area (No in step S23), the reproduction analysis unit 134 determines whether the time code is superimposed only on the ancillary area (step S27).

  As shown in FIG. 4, when it is determined that the time code is superimposed only on the ancillary area (Yes in step S27), the reproduction analysis unit 134 reads the time code superimposed on the ancillary area, and reads the read time code. The data is output to the multiplexing unit 135 (step S28). If it is determined that the time code is not superimposed on the ancillary area (No in step S27), the reproduction analysis unit 134 ends the process.

  As described above, in the first embodiment, the recording analysis unit 11 analyzes the MXF file at the time of recording and writes in the metadata as an analysis result whether the time code is superimposed on the system area or the ancillary area. . At the time of reproduction, the determination unit 133 refers to the analysis result written in the metadata and determines whether the time code is superimposed on the system area or the ancillary area. Then, the playback analysis unit 134 reads the time code from either the system area or the ancillary area based on the determination result. Thereby, the decoder 13 can read the time code regardless of whether the time code is superimposed on the system area or the ancillary area.

  Therefore, the decoder 13 according to the first embodiment outputs the time code even when it is unknown whether the time code is superimposed on the system area or the ancillary area added to the data body. be able to.

  In the first embodiment, the recording analysis unit 11 is described as an example in which the analysis result indicating whether the time code is superimposed on the system area or the ancillary area is written in the metadata of the header part. It is not necessarily limited to this. For example, the recording analysis unit 11 may treat the analysis result as a part of the material management information and output it to the storage unit 12 as a material management information file different from the MXF file.

  At this time, the storage unit 12 stores the MXF file and the material management information file from the recording analysis unit 11. The accumulating unit 12 reads the MXF file and the material management information file to be stored in response to the read instruction, and outputs the read MXF file and the material management information to the decoder 13.

  The separation unit 131 outputs the material management information to the determination unit 133, and outputs the data superimposed on the system area and the data superimposed on the ancillary area to the reproduction analysis unit 134.

  The determination unit 133 refers to the analysis result written in the material management information, and determines whether the time code is superimposed on the system area or the ancillary area. The determination unit 133 outputs the determination result to the reproduction analysis unit 134.

  Thus, by storing the analysis result in the storage unit 12 as a material management information file, the decoder 13 can read the time code regardless of whether the time code is superimposed on the system area or the ancillary area. It becomes.

(Second Embodiment)
FIG. 6 is a block diagram illustrating a functional configuration of the video server 20 according to the second embodiment. The video server 20 illustrated in FIG. 6 includes a storage unit 21 and a decoder 22.

  The accumulation unit 21 receives the MXF file. The accumulation unit 21 stores the received MXF file.

  Further, the storage unit 21 reads the MXF file to be stored in response to the read instruction. The accumulation unit 21 outputs the read MXF file to the decoder 22.

  The decoder 22 includes a separation unit 221, a decoding unit 222, a reproduction analysis unit 223, and a multiplexing unit 224.

  The separation unit 221 separates the MXF file read from the storage unit 21 into metadata, data superimposed on the system area and data superimposed on the ancillary area, and data bodies such as video data and audio data. . Separation unit 221 outputs the data body to decryption unit 222. Further, the separation unit 221 outputs metadata, data superimposed on the system area, and data superimposed on the ancillary area to the reproduction analysis unit 223.

  The decoding unit 222 decodes the data body from the separation unit 221 by a decoding method corresponding to the data body encoding method. Decoding section 222 outputs the decoded data to multiplexing section 224.

  The reproduction analysis unit 223 analyzes the system area and the ancillary area of the body part of the received MXF file, and determines whether the time code is superimposed on the system area or the ancillary area. Based on the determination result, the reproduction analysis unit 223 reads the time code from the system area or the ancillary area. The reproduction analysis unit 223 outputs the read time code to the multiplexing unit 224.

  For example, when determining that the time code is superimposed only on the system area, the reproduction analysis unit 223 reads the time code superimposed on the system area. When determining that the time code is superimposed only on the ancillary area, the reproduction analysis unit 223 reads the time code superimposed on the ancillary area. When determining that the time code is superimposed on both the system area and the ancillary area, the reproduction analysis unit 223 reads the time code superimposed on one area in accordance with a preset priority.

  The multiplexing unit 224 multiplexes the decoded data from the decoding unit 222 with the time code from the reproduction analysis unit 223 to create a baseband signal. The multiplexing unit 224 outputs the baseband signal to the subsequent stage.

  As described above, in the second embodiment, the reproduction analysis unit 223 analyzes the MXF file and determines whether the time code is superimposed on the system area or the ancillary area. Then, the reproduction analysis unit 223 reads out the time code superimposed on the system area or the ancillary area based on the determination result. Thereby, the decoder 22 can read the time code regardless of whether the time code is superimposed on the system area or the ancillary area.

  Therefore, according to the decoder 22 according to the second embodiment, the time code is output even when it is unknown whether the time code is superimposed on either the system area or the ancillary area added to the data body. be able to.

  In each of the above embodiments, as shown in FIG. 7, the case where the decoders 13 and 22 output the time code added to the data body of the body part as an example has been described as an example. However, the present invention is not limited to this. Absent. For example, the time code is superimposed on the metadata of the MXF file, and as shown in FIG. 8, the time code superimposed on the metadata is incremented for each reproduction and the time code at the time of reproduction is output. Absent. At this time, the reproduction analysis units 134 and 223 are set in advance to read the time code superimposed on the metadata or read the time code superimposed on the system area or the ancillary area. When viewing the reproduced MXF file, the time code superimposed on the metadata is set to be read. Further, when editing the reproduced MXF file, since the acquisition time of the data body is necessary, the time code superimposed on the system area or the ancillary area is set to be read.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

10, 20 ... Video server 11 ... Recording analysis unit 12, 21 ... Storage unit 13, 22 ... Decoder 131, 221 ... Separation unit 132, 222 ... Decoding unit 133 ... Determination unit 134, 223 ... Reproduction analysis unit 135, 224 ... Multiplex part

Claims (8)

In a video server that stores an MXF file in which a data body is stored in a body part for each frame, and the body part includes a system area and an ancillary area for each data body.
A recording analysis unit that analyzes a system area and an ancillary area of the MXF file and creates management information indicating which of the system area and the ancillary area includes a time code;
An accumulation unit for accumulating the MXF file from the recording analysis unit and the management information;
A decoding unit that decodes the data body of the MXF file read from the storage unit;
A determination unit that refers to the management information read from the storage unit and determines whether a time code is superimposed on a system area or an ancillary area of the MXF file;
Based on the determination result of the determination unit, a reproduction analysis unit that reads a time code from the system area or ancillary area of the MXF file read from the storage unit;
A video server, comprising: a multiplexing unit that multiplexes a data body decoded by the decoding unit and a time code from the reproduction analysis unit and outputs the multiplexed data as a baseband signal.   When the determination unit determines that the time code is superimposed on the system area and the ancillary area of the MXF file, the reproduction analysis unit determines whether the system area and the ancillary area are in accordance with a preset priority. 2. The video server according to claim 1, wherein the time code is read out from either one of them. The MXF file further includes metadata in which a time code is superimposed on a header part,
2. The reproduction analysis unit reads a time code from a preset one of MXF file metadata read from the storage unit and a system area or ancillary area of the MXF file. Or the video server of 2. In a video server that stores an MXF file in which a data body is stored in a body part for each frame, and the body part includes a system area and an ancillary area for each data body.
An accumulator for accumulating MXF files;
A decoding unit that decodes the data body of the MXF file read from the storage unit;
Analyzing the system area and ancillary area of the MXF file read from the storage unit, and based on the determination result of which of the system area and the ancillary area contains the time code, the system area or ancillary area of the MXF file A playback analysis unit that reads the time code from
A video server, comprising: a multiplexing unit that multiplexes a data body decoded by the decoding unit and a time code from the reproduction analysis unit and outputs the multiplexed data as a baseband signal.   When the playback analysis unit determines that a time code is superimposed on the system area and the ancillary area of the MXF file, the playback analysis unit performs time from either the system area or the ancillary area according to a preset priority. 5. The video server according to claim 4, wherein the code is read out. The MXF file further includes metadata in which a time code is superimposed on a header part,
5. The reproduction analysis unit reads a time code from a preset one of the metadata of the MXF file read from the storage unit and the system area or ancillary area of the MXF file. Or the video server of 5. An MXF file playback method used in a video server for storing an MXF file in which a data body is stored in a body part for each frame, and the body part includes a system area and an ancillary area for each data body,
Analyzing the system area and ancillary area of the MXF file, creating management information as to which of the system area and the ancillary area contains the time code,
Storing the MXF file and the management information in a storage unit;
Decode the data body of the MXF file read from the storage unit,
Refer to the management information read from the storage unit, determine whether the time code is superimposed on the system area or ancillary area of the MXF file,
Based on the determination result, the time code is read from the system area or ancillary area of the MXF file read from the storage unit,
An MXF file reproduction method, wherein the decoded data body and the read time code are multiplexed and output as a baseband signal. An MXF file playback method used in a video server for storing an MXF file in which a data body is stored in a body part for each frame, and the body part includes a system area and an ancillary area for each data body,
Store MXF files in the storage unit,
Decode the data body of the MXF file read from the storage unit,
Analyzing the system area and ancillary area of the MXF file read from the storage unit, and based on the determination result of which of the system area and the ancillary area contains the time code, the system area or ancillary area of the MXF file Read the time code from
An MXF file reproduction method, wherein the decoded data body and the read time code are multiplexed and output as a baseband signal.

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