JP4321713B2 - Information recording method and apparatus - Google Patents

Description

  The present invention relates to an information recording apparatus suitable for recording content data of a digital TV broadcast program, for example.

Conventionally, in the field of information recording technology, when an external AV input signal is encoded into MPEG-TS, an information recording medium capable of high-speed conversion to MPEG-PS conforming to the DVD standard, information on the information recording medium An information recording apparatus and an information recording method for recording the information have been proposed. Where AV is Audio-Visual, MPEG-TS is Moving Picture Exparts-Groupe-Transport
Stream, DVD, Digital Versatile Disk, and (MPEG-PS) PS, Program Stream, are abbreviated (hereinafter the same). In this proposal, management information (flag information indicating that a first stream (for example, MPEG-TS) has been recorded in a restricted format that can be converted into a second stream (for example, MPEG-PS) ( VOBI). By referring to the management information (VOBI), it is possible to easily recognize whether or not the recorded data is recorded in the restricted format without analyzing the data recorded on the information recording medium (see, for example, Patent Document 1). .

JP 2003-228922 A

  In recent years, content information (hereinafter abbreviated as “program content information”) of television (hereinafter referred to as “TV”) broadcast programs on a DVD or hard disk (hereinafter referred to as “HD”) is MPEG2 Products (information recording devices) capable of recording in a data standard (data format) have become widespread. As described above, the MPEG2 data standard (data format) includes the MPEG2-TS standard, which is a multiplexing / demultiplexing system compatible with multiprograms, and one program (movie / program, etc.) multiplexed into a basic packet. There are two types of MPEG2-PS standards for time division transmission. The MPEG2-TS standard is mainly used in broadcasting systems that transmit a plurality of program content information, ATM (Asynchronous Transfer Mode), and the like, and also in receivers (IRD) and digital VTR systems. On the other hand, the MPEG2-PS standard is mainly used in a system for recording / reproducing one movie or program on a storage medium such as a DVD.

  Even when the same program content information is recorded using the MPEG2-TS standard and when recording using the MPEG2-PS standard, the former program additional information sent by broadcasting Etc. can be recorded together. In addition, although conversion from the MPEG2-TS standard to the MPEG2-PS standard is possible, conversion from the MPEG2-PS standard to the MPEG2-TS standard, which is the reverse of this, is difficult. Therefore, in order to record program content information, the MPEG2-TS standard, which is a data standard suitable for recording a large number of program content information, is usually used as an MPEG2 data standard. A certain HD is used.

  By the way, depending on the user, it may be assumed that only specific program content information, which is so-called favorite program content information, is recorded and stored on the DVD among the program content information recorded on the HD. In such a case, the MPEG2-PS standard (format) is more suitable for recording on a DVD. Therefore, in order to re-record the program content information recorded on the HD in the MPEG2-TS standard on the DVD, It becomes necessary to convert to the MPEG2-PS standard (format).

  However, it takes time to convert a stream (program content information) multiplexed in the MPEG2-TS standard to the MPEG2-PS standard, for example, it is necessary to recalculate the complicated buffer management of the decoder. There is.

  Accordingly, a first object of the present invention is to provide a predetermined video / audio data desired by a user, which is different from the video / audio data converted into the predetermined first compression format to be recorded in the video / audio data storage unit. What is converted into the second compression format is to enable recording on a recording medium of a different type from the above in a relatively short time.

  The second object of the present invention is that the recording capacity of the video / audio data storage unit is video / audio data desired by the user, which is converted into a predetermined first compression format, When there is no room for recording together with the data converted into the predetermined second compression format necessary for re-recording on a different type of recording medium, the video / audio data is in accordance with the data standard according to the user's request. Is to be able to record.

  An information recording apparatus according to a first aspect of the present invention includes a video / audio data extraction unit that extracts video / audio data desired by a user from a plurality of input video / audio data, and the video / audio data extraction unit. A first video / audio data conversion unit that converts the extracted video / audio data into video / audio data of a predetermined first compression format and outputs the video / audio data, and the video extracted by the video / audio data extraction unit A second video / audio data converter for converting audio data into video / audio data in a predetermined second compression format different from the first compression format, and the first video / audio To store the first compressed video / audio data output from the data converter and the second compressed video / audio data output from the second video / audio data converter, respectively. of The image / audio data storage unit and the video / audio data storage unit each have a free space capable of storing both the first compressed video / audio data and the second compressed video / audio data. When the free space detection unit for detecting whether or not the free space detection unit detects that there is no free space in the video / audio data storage unit, the user performs the first and second compression. A determination unit that determines which format video / audio data is desired, and stores the compressed video / audio data according to the determination result of the determination unit in the video / audio data storage unit Accordingly, the first video / audio data conversion unit and / or the second video / audio data conversion unit is controlled.

  In a preferred embodiment according to the first aspect of the present invention, when the determination unit determines that the user does not desire any of the first and second compressed video / audio data, The control unit controls the first video / audio data conversion unit.

  An information recording apparatus according to a second aspect of the present invention includes a video / audio data extracting unit that extracts video / audio data from a plurality of input video / audio data, and a video extracted by the video / audio data extracting unit. A first video / audio data converter that converts audio data into video / audio data in a first compression format and outputs the video / audio data extracted by the video / audio data extractor; A second video / audio data conversion unit that converts and outputs video / audio data in a second compression format different from the first compression format, and the above-mentioned output from the first video / audio data conversion unit A video / audio data storage unit for storing video / audio data in a first compression format and video / audio data in the second compression format output from the second video / audio data conversion unit; Video / Sound If the data storage unit does not have enough free space to store both the first compressed video / audio data and the second compressed video / audio data, the first compressed video A control unit that controls to store either the audio data or the video / audio data in the second compression format in the video / audio data storage unit;

  In a preferred embodiment according to the second aspect of the present invention, the control unit controls the first compressed video / audio data and the second compressed video / audio data based on a user selection. Is controlled to be stored in the video / audio data storage unit.

  In an embodiment different from the above, the first compression format is an MPEG2-TS format, and the second compression format is an MPEG2-PS format.

  According to a third aspect of the present invention, there is provided an information recording method comprising: extracting video / audio data from a plurality of input video / audio data; and extracting video / audio data in the step of extracting the video / audio data. Is converted into video / audio data of the first compression format and output, and the video / audio data extracted in the step of extracting the video / audio data is different from the first compression format. Converting to and outputting video / audio data in the second compression format, storing video / audio data in the first compression format, and video / audio data in the second compression format; When there is no free space for storing both the video / audio data in the first compression format and the video / audio data in the second compression format, the video / audio in the first compression format Chromatography comprising data, or the step of controlling to store either the video and audio data of the second form of compression, the.

  In a preferred embodiment according to the third aspect of the present invention, the first compression format is an MPEG2-TS format, and the second compression format is an MPEG2-PS format.

  According to the present invention, the predetermined second compression different from the video / audio data desired by the user converted into the predetermined first compression format to be recorded in the video / audio data storage unit. What has been converted into a format can be recorded in a relatively short time on a different type of recording medium.

  According to the present invention, the recording capacity of the video / audio data storage unit includes video / audio data desired by the user, which has been converted into the predetermined first compression format, and the above When there is no room for recording together with the data converted into the predetermined second compression format necessary for re-recording on another type of recording medium, the video / audio data is recorded according to the data standard according to the user's request. Can be able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing the overall configuration of an information recording apparatus according to an embodiment of the present invention.

  The information recording apparatus 100 includes a configuration of a TV receiver (hereinafter referred to as “TV receiver”) capable of receiving digital television (TV) broadcast radio waves, for example. The information recording apparatus 100 has a function of recording digital AV data (digital video / audio data) such as a received digital TV broadcast signal in the MPEG2 data standard (data format), a function of reproducing the recorded digital AV data, and the like. Have

  As shown in FIG. 1, the information recording apparatus 100 includes an input terminal 1, a receiving unit 3, a packet separating unit 5, a decoding unit 7, an output terminal 9, an MPEG2-TS recording unit 11, an MPEG2- A PS recording unit 13, an MPEG2-TS playback unit 15, an MPEG2-PS copy unit 17, an MPEG2-PS decoding unit 19, a storage unit 21, and a control unit 23 are provided. Reference numeral 25 denotes an MPEG2-PS recording medium that is detachable from the information recording apparatus 100 used in the information recording apparatus 100 for recording digital data in the MPEG2-PS format, such as a DVD.

  The input terminal 1 is connected to an antenna (not shown), and is a digital TV (encoded TV broadcast radio wave) from a plurality of digital TV broadcast stations (not shown) received by the antenna (not shown). Broadcast radio waves are transmitted to the receiver 3 through the input terminal 1.

  The receiving unit 3 reads some of the TV broadcast radio waves through the input terminal 1 under the control of the control unit 23, so that some digital AV data (which is encoded AV data) included in the TV broadcast radio waves. Are demodulated and modulated signals (hereinafter referred to as “video signals”). At the same time, the receiving unit 3 corrects an error generated in the video signal when the TV broadcast radio wave is transmitted from the digital TV broadcast station (not shown) to the information recording apparatus 100. The video signal after the error correction is output from the receiving unit 3 to the packet separating unit 5.

  The packet separation unit 5 receives the video signal output from the reception unit 3 under the control of the control unit 23, selects / extracts digital AV data desired by the user, and selects the extracted / extracted digital signal. The AV data is output to the decoding unit 7.

  Under the control of the control unit 23, the decoding unit 7 decodes the digital AV data output from the packet separation unit 5 (so that it can be viewed by the user) and outputs it to the output terminal 9.

  The MPEG2-TS recording unit 11 reads the digital AV data selected / extracted by the packet separation unit 5 under the control of the control unit 23, and reads the read digital AV data (from a digital TV broadcast station (not shown)). In accordance with the received MPEG2-TS format, it is converted into the MPEG2-TS format and then recorded in the storage unit 21.

  Under the control of the control unit 23, the MPEG2-PS recording unit 13 reads the digital AV data selected / extracted by the packet separation unit 5, converts the read digital AV data into the MPEG2-PS format, and then stores the digital AV data. 21.

  Under the control of the control unit 23, the MPEG2-TS playback unit 15 reads out and plays back the digital AV data stored in the storage unit 21 in the MPEG2-TS format from the storage unit 21, and decodes the reproduced digital AV data. To the conversion unit 7.

  Under the control of the control unit 23, the MPEG2-PS copy unit 17 reads out the digital AV data stored in the storage unit 21 in the MPEG2-PS format from the storage unit 21, and converts the read digital AV data into the MPEG2- Copy to PS recording medium 25.

  Under the control of the control unit 23, the MPEG2-PS decoding unit 19 reproduces the digital AV data stored in the MPEG2-PS recording medium 25 (in the MPEG2-PS format), and plays the reproduced digital AV data. , Output to the output terminal 9.

  The storage unit 21 has a storage capacity large enough to store, for example, TV broadcast program content data (the above-described digital AV data). The storage unit 21 stores the digital AV data converted into the MPEG2-TS format by the MPEG2-TS recording unit 11 and stores the digital AV data converted into the MPEG2-PS format by the MPEG2-PS recording unit 13. In response to a data read request from the MPEG2-TS playback unit 15, the storage unit 21 outputs the digital AV data stored in the MPEG2-TS format to the MPEG2-TS playback unit 15. The storage unit 21 also outputs the digital AV data stored in the MPEG2-PS format to the MPEG2-PS copy unit 17 in response to a data read request from the MPEG2-PS copy unit 17.

  The control unit 23 is configured by each unit (that is, the reception unit 3, the packet separation unit 5, the decoding unit 7, the MPEG2-TS recording unit 11, the MPEG2-PS recording unit 13, and the MPEG2-TS reproduction) constituting the information recording apparatus 100 described above. Unit 15, MPEG2-PS copy unit 17, and MPEG2-PS decoding unit 19).

  Next, an example of a recording operation of content data of a TV broadcast program in the information recording apparatus 100 having the above configuration will be described.

  An antenna (not shown) receives digital TV broadcast radio waves from a plurality of digital TV broadcast stations (not shown), so that a video signal obtained by multiplexing several digital AV data is input from the input terminal 1 to the receiving unit 3. And the video signal is demodulated in the receiver 3. The control unit 23 controls the packet separation unit 5 so that the content data of the TV broadcast program desired by the user can be obtained, and the obtained content data of the TV broadcast program in the MPEG2-TS format and the MPEG2-PS format, respectively. In order to record, the MPEG2-TS recording unit 11 and the MPEG2-PS recording unit 13 are controlled.

  Thereby, the MPEG2-TS recording unit 11 converts the content data of the obtained TV broadcast program into the MPEG2-TS format in accordance with the received MPEG2-TS format (from a digital TV broadcast station (not shown)). To the storage unit 21. On the other hand, the MPEG2-PS recording unit 13 converts the obtained content data of the TV broadcast program into content data in the MPEG2-PS format and then records it in the storage unit 21.

  In this way, each time content data of the same TV broadcast program is recorded, the content data is converted into the MPEG2-TS format and the MPEG2-PS format, respectively, and then recorded in the storage unit 21. .

  Next, an example of an operation for copying content data of a TV broadcast program to the MPEG2-PS recording medium 25 in the information recording apparatus 100 having the above configuration will be described.

  The control unit 23 controls the MPEG2-PS copy unit 17 in order to copy the MPEG2-PS format data stored in the storage unit 21 to the MPEG2-PS recording medium 25. The MPEG2-PS copy unit 17 reads the content data of the TV broadcast program stored in the MPEG2-PS format in the storage unit 21 and writes the read content data to the MPEG2-PS recording medium 25. Thus, when there is a request to copy the content data of the TV broadcast program stored in the storage unit 21 to the MPEG2-PS recording medium 25, the content is converted into the MPEG2-PS format in advance and stored in the storage unit 21. Since the content data of the TV broadcast program stored in can be used, conversion to the MPEG2-PS format at the time of the copying operation is not required, so that the processing time at the time of copying can be shortened.

  As described above, the content data of the TV broadcast program is converted into the MPEG2-TS format and the MPEG2-PS format at the time of recording in the information recording apparatus 100, and both are stored in the storage unit 21. Since it is possible to reduce the processing time when copying the content data of the TV broadcast program from the storage unit 21 to the MPEG2-PS recording medium 25 later, it is possible to improve the usability of the user.

  FIG. 2 is a diagram showing an example of a recording mode setting screen for TV broadcast program content data included in the information recording apparatus 100 shown in FIG.

  In the recording mode setting screen 27 shown in FIG. 2, the user can convert the content data of a desired TV broadcast program into only the MPEG2-TS format and record it in the storage unit 21 (of the information recording apparatus 100). Alternatively, the content data of the TV broadcast program can be converted into the MPEG2-TS format and the MPEG2-PS format, respectively, and either one of the recording modes can be set alternatively. .

  FIG. 3 is a flowchart showing an example of a recording operation of content data of a TV broadcast program in the information recording apparatus 100 shown in FIG.

  In FIG. 3, first, it is checked whether or not the user has requested recording of content data of a desired TV broadcast program (step S101). As a result of this check, if it is recognized that a recording request has been made (YES in step S101), the content data is recorded in the MPEG2-TS format and the MPEG2-PS format on the recording mode setting screen 27 shown in FIG. It is checked whether or not the recording mode has been selected (that is, whether or not there is a recording request in the MPEG2-PS format) (step S102).

  As a result of this check, if it is recognized that there is a request for recording in the MPEG2-PS format (YES in step S102), the content data is converted into the MPEG2-TS format and the MPEG2-PS format, respectively. Both are written in the storage unit 21 (step S103). On the other hand, if there is no request for recording in the MPEG2-PS format as a result of the check (NO in step S102), only the content data after conversion to the MPEG2-TS format is written in the storage unit 21 (step S102). S104).

  FIG. 4 is a diagram showing a modification of the recording mode setting screen for content data of a TV broadcast program in the information recording apparatus 100 shown in FIG.

  The recording mode setting screen 105 shown in FIG. 4 is based on the assumption that the user-desired TV broadcast program content data is set to a mode for recording in both MPEG2-TS format and MPEG2-PS format. This is a screen displayed on the display unit (not shown) of the information recording apparatus 100 when the storage unit 21 has insufficient storage capacity. The recording mode setting screen 105 includes a soft key 105a for setting a recording mode in the MPEG2-TS format as means for setting a priority recording mode for giving priority to either the MPEG2-TS format or the MPEG2-PS format. And a soft key 105b for setting a recording mode in the MPEG2-PS format. When the soft key 105a selects a mode for converting the content data into the MPEG2-TS format and recording, the soft key 105b selects the mode for converting the content data into the MPEG2-PS format and recording. In addition, each user performs a touch operation. If the user does not touch any soft key (105a, 105b) while the recording mode setting screen 105 is displayed, the MPEG2-TS format is set by default.

  FIG. 5 is a flowchart showing a modification of the recording operation of content data of a TV broadcast program in the information recording apparatus 100 shown in FIG.

  Also in this modified example, as in the above-described embodiment of the present invention, when there is a vacant storage capacity of the storage unit 21 shown in FIG. 1, the content data of the received TV broadcast program is recorded as information recording. At the time of recording in the apparatus 100, both are converted into the MPEG2-TS format and the MPEG2-PS format, and both are stored in the storage unit 21. However, when the storage capacity of the storage unit 21 is small, the user can select whether the content data is converted into the MPEG2-TS format or the MPEG2-PS format and stored in the storage unit 21. Let it be entrusted. This is different from the above-described embodiment of the present invention.

  In FIG. 5, first, it is checked whether or not the user has requested to record the content data of the TV broadcast program (step S111). As a result of the check, if it is recognized that a recording request has been made (YES in step S111), the storage capacity of the storage unit 21 is the content data of the TV broadcast program desired by the user, and is in MPEG2-TS format and MPEG2 It is checked whether there is enough free space to store both the content data converted into the -PS format (step S112). As a result of this check, if the storage capacity of the storage unit 21 is not small (NO in step S112), the content data of the desired TV broadcast program from the user is either in the MPEG2-TS format or the MPEG2-PS format. On the other hand, it is checked whether there is no instruction to record, that is, a priority recording designation instruction, and the storage unit 21 has enough free space to record the content data in the MPEG2-TS format. This check is performed, for example, by detecting whether the soft key (105a, 105b) on the recording mode setting screen 105 shown in FIG. 4 has been touched by the user (step S113).

  As a result of this check, if the storage unit 21 recognizes that there is at least a priority recording designation instruction, regardless of whether there is enough free space to record the content data in the MPEG2-TS format (step S113). Next, it is checked whether or not it is an instruction to specify priority recording in the MPEG2-TS format, and whether or not the storage unit 21 has enough free space to record the content data in the MPEG2-TS format. This check is also performed by detecting whether the soft key (105a, 105b) on the recording mode setting screen 105 shown in FIG. 4 is touched by the user (step S114).

  As a result of this check, if it is recognized that there is no preferential recording designation instruction in the MPEG2-TS format and that the storage unit 21 does not have enough free space to record the content data in the MPEG2-TS format (step NO in S114), it is checked whether or not it is an instruction to specify priority recording in the MPEG2-PS format, and whether or not the storage unit 21 has enough free space to record the content data in the MPEG2-PS format (step S115).

  As a result of this check, if it is recognized that the priority recording designation instruction is MPEG2-PS and the storage unit 21 has enough free space to record the content data in the MPEG2-PS format (YES in step S115). ) After the content data is converted into the MPEG2-PS format, it is written in the storage unit 21 (step S116). Thereby, a series of processing operations are completed. If there is not enough free space in the storage unit 21 to record the content data in the MPEG2-PS format (NO in step S115), a series of processing operations are performed without writing the content data into the storage unit 21. finish.

  Next, when it is recognized that the priority recording designation instruction is in the MPEG2-TS format and the storage unit 21 has enough free space to record the content data in the MPEG2-TS format (YES in step S114). After the content data is converted into the MPEG2-TS format, it is written in the storage unit 21 (step S117). Thereby, a series of processing operations are completed. Even when there is no priority recording designation instruction and the storage unit 21 recognizes that there is enough free space to record the content data in the MPEG2-TS format (YES in step S113), the content data is converted to MPEG2. After the conversion to the TS format, the data is written in the storage unit 21 (step S117). If the storage capacity of the storage unit 21 is the same content data as the above-described content data and has enough free space to store both the content data converted into the MPEG2-TS format and the MPEG2-PS format (step S112) YES), both the content data converted into the MPEG2-TS format and the MPEG2-PS format are written in the storage unit 21 (step S118), and the series of processing operations is completed.

  The preferred embodiments of the present invention and modifications thereof have been described above, but these are examples for explaining the present invention, and the scope of the present invention is limited only to these embodiments and modifications. is not. The present invention can be implemented in various other forms.

1 is a block diagram showing an overall configuration of an information recording apparatus according to an embodiment of the present invention. The figure which shows an example of the recording mode setting screen of TV broadcast program content data which the information recording device described in FIG. 1 has. The flowchart which shows an example of the recording operation | movement of the content data of a TV broadcast program in the information recording device described in FIG. The figure which shows the modification of the recording mode setting screen of the content data of a TV broadcast program in the information recording device described in FIG. The flowchart which shows the modification of the recording operation | movement of the content data of a TV broadcast program in the information recording device described in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input terminal 3 Receiving part 5 Packet separation part 7 Decoding part 9 Output terminal 11 MPEG2-TS recording part 13 MPEG2-PS recording part 15 MPEG2-TS reproduction part 17 MPEG2-PS copying part 19 MPEG2-PS decoding part 21 Storage Unit 23 Control unit 25 MPEG2-PS recording medium (used for information recording apparatus 100) 27, 105 Recording mode setting screen (for TV broadcast program content data) 100 Information recording apparatus

Claims (7)

A video / audio data extraction unit for extracting video / audio data desired by the user from a plurality of input video / audio data;
A first video / audio data conversion unit that converts the video / audio data extracted by the video / audio data extraction unit into video / audio data of a predetermined first compression format and outputs the video / audio data;
A second video / audio that is output by converting the video / audio data extracted by the video / audio data extraction unit into video / audio data of a predetermined second compression format different from the first compression format. A data converter,
The first compressed video / audio data output from the first video / audio data converter, and the second compressed video / audio data output from the second video / audio data converter. A video / audio data storage unit for storing audio data;
Free space for detecting whether or not the video / audio data storage section has a free space capable of storing both the first compressed video / audio data and the second compressed video / audio data A detection unit;
When the free space detection unit detects that the video / audio data storage unit does not have the free space, the user desires either the first or second compression format video / audio data. A determination unit for determining whether or not
With
The first video / audio data conversion unit and / or the second video / audio data is stored in the video / audio data storage unit in a compressed format according to the determination result of the determination unit. An information recording apparatus for controlling a data conversion unit. The information recording apparatus according to claim 1,
When the determination unit determines that the user does not desire any of the first and second compressed video / audio data, the control unit determines the first video / audio data conversion unit. An information recording device that is controlled. A video / audio data extraction unit for extracting video / audio data from a plurality of input video / audio data;
A first video / audio data conversion unit that converts the video / audio data extracted by the video / audio data extraction unit into video / audio data of a first compression format and outputs the data;
Second video / audio data conversion for converting the video / audio data extracted by the video / audio data extraction unit into video / audio data of a second compression format different from the first compression format and outputting the converted data And
The first compressed video / audio data output from the first video / audio data converter, and the second compressed video / audio data output from the second video / audio data converter. A video / audio data storage unit for storing audio data;
When the video / audio data storage section does not have a free space capable of storing both the video / audio data in the first compression format and the video / audio data in the second compression format, the first A control unit for controlling the video / audio data storage unit to store any one of the compressed video / audio data and the second compressed video / audio data;
An information recording apparatus comprising: The information recording apparatus according to claim 3,
The control unit stores either the first compressed video / audio data or the second compressed video / audio data in the video / audio data storage unit based on a user selection. Information recording apparatus to control as follows. The information recording apparatus according to any one of claims 1 to 4,
The first compression format is MPEG2-TS format;
An information recording apparatus wherein the second compression format is an MPEG2-PS format. Extracting video / audio data from a plurality of input video / audio data;
Converting the video / audio data extracted in the step of extracting the video / audio data into video / audio data of a first compression format and outputting the data;
Converting the video / audio data extracted in the step of extracting the video / audio data into video / audio data of a second compression format different from the first compression format, and outputting the video / audio data;
Storing the video / audio data in the first compression format and the video / audio data in the second compression format;
When there is no free space capable of storing both the video / audio data in the first compression format and the video / audio data in the second compression format, or the video / audio data in the first compression format, or Controlling to store any one of the video / audio data in the second compression format;
An information recording method comprising: The information recording method according to claim 6, wherein
The first compression format is MPEG2-TS format;
An information recording method in which the second compression format is an MPEG2-PS format.

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