JP2003224831A - Multiplexing apparatus and method, recording medium, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily revise the contents of a prescribed multiplexed stream. <P>SOLUTION: A scheduler 8 controls multiplexing of a multiplexer 8 according to a multiplexing schedule based on arrival time information attached to packets constituting a stream other than a video stream. A multiplexer 9 properly reads packets constituting a video stream stored in a buffer memory 5 and attaches the arrival time information supplied from the scheduler 8 to the packet. The multiplexer 9 multiplexes the packets of streams other than video streams read from a buffer memory 7 on the packets of the video streams read from the buffer memory 5 and supplies resultant MPEG transport streams to an error correction section 10. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplexing device and method, a recording medium, and a program, and more particularly, to a multiplexing device and method capable of easily changing the contents of a multiplexed stream. , A recording medium, and a program.

[0002]

2. Description of the Related Art MPEG is used as a standard for multiplexing and recording or transmitting information such as video and audio, and related information such as subtitles and still images.
(MovingPicture Experts Group) System standard (ISO / I
EC13818-1) exists.

[0003] For example, DV performed in Europe
In digital television broadcasting such as B (Digital Video Broadcasting) or BS (Broadcasting Satellite) digital broadcasting performed in Japan, MPEG2 transport stream is used, and DVD-video format or DVD-VR ( An MPEG program stream is used for recording in a video recording format or the like.

By the way, the contents of a specific stream, such as a case where the bit rate of a video stream or an audio stream multiplexed in an MPEG transport stream or an MPEG program stream is lowered, are changed. In this case, it was necessary to separate all multiplexed streams, to process a given stream, and then to remultiplex all streams.

Usually, when performing re-multiplexing, many operations are required, and a memory for separately storing separated streams must be prepared and managed, so that a specific stream is eventually obtained. When changing the contents of, there is a problem that it takes time and the configuration of the device becomes complicated.

The present invention has been made in view of such a situation, and it is an object of the present invention to easily change the contents of a predetermined stream which is multiplexed.

[0006]

The multiplexer according to the present invention comprises:
A calculation unit that calculates the amount of data that can be inserted into the first multiplexed stream based on the arrival time of the first multiplexed stream, and the data for the amount of data calculated by the calculation unit is used as the first multiplexed stream. And a multiplexing unit for multiplexing the second multiplexed stream.

In the multiplexing method of the present invention, the calculation step of calculating the amount of data that can be inserted into the first multiplexed stream based on the arrival time of the first multiplexed stream and the calculation step are performed. And a multiplexing step of inserting data of the data amount into the first multiplexed stream and multiplexing the second multiplexed stream.

The program of the recording medium of the present invention comprises a calculation control step for controlling the calculation of the amount of data that can be inserted into the first multiplexed stream based on the arrival time of the first multiplexed stream, and processing of the calculation control step. And a multiplexing control step of controlling the multiplexing of the second multiplexed stream by inserting the data for the data amount calculated in step 1 into the first multiplexed stream.

The program of the present invention is calculated by the calculation control step for controlling the calculation of the amount of data that can be inserted into the first multiplexed stream based on the arrival time of the first multiplexed stream, and the calculation control step. And a multiplexing control step of controlling the multiplexing of the second multiplexed stream by inserting the data of the data amount into the first multiplexed stream. .

In the multiplexing device and method and the program of the present invention, the amount of data that can be inserted into the first multiplexed stream is calculated based on the arrival time of the first multiplexed stream, and the calculated amount of data is calculated. Minutes of data
The second multiplexed stream is multiplexed by being inserted into the first multiplexed stream.

[0011]

1 shows an example of the configuration of a recording apparatus to which the present invention is applied.

The tuner 1 demodulates the received radio wave, and the MPEG (Movi) of the channel selected by the program selection information is demodulated.
ng Picture Experts Group) 2 MPEG transport stream encoded according to the standard is output to the demultiplexer 2.

The demultiplexer 2 extracts a stream forming a program selected by the program selection information from the MPEG transport stream supplied from the tuner 1, and extracts the extracted stream from a PID (packet I
The video stream is decomposed into a video stream and a stream other than the video stream (stream consisting of audio data and control data) based on D), and the video stream is supplied to the video decoder 3. Supply to.

For example, when the MPEG transport stream shown in FIG. 2A is input to the demultiplexer 2, for example, only the packets of the video stream to which the "V" is attached in the drawing are added to the arrival time adding unit 6. 2B, audio data packets P0, P1, P3, ... And control data packets P2,
Is supplied. In this stream, the position of each packet (packet interval) holds the state in the original MPEG transport stream.

The video decoder 3 includes a demultiplexer 2
The video stream input from is decoded in accordance with the MPEG2 standard, and the resulting video signal is supplied to the video encoder 4. At this time, the video decoder 3 extracts the display time information incorporated in the video stream and supplies it to the scheduler 8.

The video encoder 4 is a video decoder 3
Video signal from MPEG at the required bit rate (eg lower than the original bit rate)
The video stream obtained as a result of encoding in accordance with the standard No. 2 is supplied to the multiplexer 9 via the buffer memory 5. At this time, the video encoder 4
For example, Picture Coding Type, amount of generated bits, Top Fie
The access unit information such as ld First Flag and Repeat First Field Flag is supplied to the scheduler 8.

The arrival time addition unit 6 adds arrival time information indicating the time when the packet arrives at the recording device, to the input packet that constitutes a stream other than the video stream. Packets with arrival time information added,
It is supplied to the buffer memory 7 and temporarily stored.

For example, when the stream shown in FIG. 2B is input to the arrival time addition unit 6, for example, the packet P
Since the arrival time of 0 is time t0, as shown in FIG. 2C, arrival time information (indicated as ATS in the figure) representing time t0 is added to the packet P0 and stored in the buffer memory 7. Remembered. Similarly, the packet P1 is added with the time information indicating the time t1, the packet P2 is added with the time information indicating the time t2, and the packet P3 is added with the time information indicating the time t3. Remembered.

The arrival time information may be any information as long as the time interval of multiplexing can be restored, and for example, a count value of a 27 MHz clock is used. In the example of FIG. 2C, the arrival time information is added to the beginning of the packet, but if it can be removed later, it can be added to another place.

The scheduler 8 has display time information input from the video decoder 3, access unit information input from the video encoder 4, and a multiplexer 9.
The multiplexing of the multiplexer 9 is controlled according to the multiplexing schedule based on the arrival time information (arrival time information added to the packets forming the stream other than the video stream) input from the. When controlling the multiplexing, the scheduler 8 supplies the arrival time information added to the packets forming the video stream to the multiplexer 9.

The multiplexer 9 appropriately reads the packets forming the streams other than the video stream stored in the buffer memory 7, reads the arrival time information added thereto, and notifies the scheduler 8 of the arrival time information.

The multiplexer 9 appropriately reads the packets forming the video stream stored in the buffer memory 5, and adds the arrival time information supplied from the scheduler 8 thereto.

Under the control of the scheduler 8, the multiplexer 9 multiplexes the packets of the streams other than the video stream read from the buffer memory 7 and the packets of the video stream read from the buffer memory 5, and the resulting MPEG transport. The stream is supplied to the error correction unit 10.

For example, as shown in FIG.
The MPEG transport stream is supplied to the error correction unit 10.

The MPEG transport stream supplied to the error correction unit 10 is subjected to error correction there, and after being modulated, passes through the recording head 12 to a recording medium 13
Will be supplied to and recorded.

As described above, since the arrival time information for restoring the multiplexing interval is added to the packets of the video stream and the packets of the streams other than the video stream, the re-multiplexed MPEG transport stream is As shown in FIG. 2E, reproduction is performed with the time interval during recording maintained.

Next, the operation of the scheduler 8 when recording an MPEG transport stream will be described with reference to the flowchart of FIG.

In step S10, the scheduler 8
Calculates the time T0 required to multiplex (insert) one packet based on the following equation. T0 (sec) = packet length (bit) / Rmux (bps) The packet length is 1 in the MPEG transport stream.
It is constant at 88 × 8 bits. Rmux is the multiplexing rate.

The time T0 calculated here is stored in the memory built in the scheduler 8.

Next, in step S11, the scheduler 8 determines whether or not there is a packet that has not been multiplexed, and if it is determined that there is a packet, that is,
If the stream has not ended, the process proceeds to step S12.

In step S12, the scheduler 8
Reads the arrival time information input from the multiplexer 9 (for example, the arrival time information of the packet Pcur which constitutes a stream other than the video stream read from the buffer memory 7 by the multiplexer 9 now), and indicates the time represented by the time. Store as tcur.

For example, the arrival time information when the packet P1 of FIG. 2C is added to the multiplexer 9 is read, and the time t1 represented by the arrival time information is stored as the time tcur.

Next, in step S13, the scheduler 8 receives the time tcur and the arrival time information (packet Pcu input from the multiplexer 9 in the previous processing here.
The difference Tdiff is calculated as shown in the following equation using the time tprev that represents the arrival time information of the packet Pprev read from the buffer memory 7 by the multiplexer 9 immediately before r. Tdiff = tprev-tcur

For example, as shown in FIG.
The interval between the packet P0 (packet Pprev) and the packet P1 (packet Pcur) in B is calculated as Tdiff.

The scheduler 8 then sends the packet Pcur
The time tcur represented by the arrival time information (time t1 represented by the arrival time information of the packet P1) is stored as the time tprev.

In step S14, the scheduler 8
Determines whether Tdiff calculated in step S13 is greater than the value 0. If it is determined that Tdiff is greater than 0, step S1
Go to step 5 and calculate the following formula to calculate Tdiff (packet P
Calculate the number N of packets of the video stream that can be inserted (between prev and packet Pcur).

N = (Tdiff / T0) -1

For example, as shown in FIG. 4, packet P1
When the packet P0 is the packet Pprev and the packet Pcur, the number N of packets of the video stream that can be inserted into Tdiff is 3.

In step S16, the scheduler 8
Judges whether or not the number of packets N calculated in step S15 is 0, and if it is judged not to be 0, the process proceeds to step S17.

In step S17, the scheduler 8
Confirms whether or not the T-STD buffer has a free space for storing one packet, and in step S18, based on the confirmation result, can the packet of the video stream be multiplexed? Determine whether or not. The details of the process of step S17 will be described later.

If it is determined in step S18 that multiplexing is possible, the process proceeds to step S19, in which the scheduler 8
Instruct the multiplexer 9 to perform multiplexing.

Next, in step S20, the scheduler 8 subtracts the value 1 from the number N of packets, and
In step S21, the time obtained by adding the time T0 to the current time is supplied to the multiplexer 9 as the arrival time information added to the packet of the video stream.

The current time and time T0 are both the time and time on the time scale based on the PCR of the MPEG transport stream, and are added by the arrival time adding unit 6 to the packets of streams other than the video stream. Since the arrival time is a time on the time scale unique to the arrival time adding unit 6, the time scales differ from each other. Therefore, when the video stream and the streams other than the video stream are multiplexed, the time scales of the arrival times are set to each other. Need to be unified.

To unify the time scale, the arrival time information added to the packets of the video stream is changed to the time scale of the arrival time addition unit 6 or the arrival time added to the packets of the streams other than the video stream. This can be done by changing the information to the PCR time scale, but in this case, the arrival time information (time obtained by adding the time T0 to the current time) added to the packet of the video stream, The time scale of the arrival time addition unit 6 is used for conversion.

Thereafter, the process returns to step S16,
Subsequent processing is performed.

When the multiplexer 9 receives the multiplexing instruction from the scheduler 8 (step S19), it reads one packet of the video stream from the buffer memory 5, and receives the arrival time information (step S21) supplied from the scheduler 8 therein. Add and packet Ppr
Pack from ev and multiplex (insert). The packet Pprev is multiplexed in step S22, which will be described later and is performed last time.

If it is determined in step S18 that the packets of the video stream cannot be multiplexed,
The process of step S19 is skipped and step S20 is performed.
Proceed to. That is, in this case, the arrival time information is supplied to the multiplexer 9 in step S21, but since multiplexing is not instructed (step S19), packet multiplexing of the video stream is not performed.

When it is determined in step S16 that the number of packets N = 0, that is, when all the packets of the number that can be inserted in Tdiff are all multiplexed, the process proceeds to step S22, and the scheduler 8 Instructs multiplexing of packets for streams other than video streams.

At this time, the multiplexer 9 multiplexes (inserts) the packet Pcur of the stream other than the video stream into the packet of the video stream multiplexed according to the instruction in the process of step S19. As a result, for example, as shown in FIG. 2D, the packets of the three video streams are inserted (multiplexed) between the packets P0 and P1.

Then, the process returns to step S11, and the subsequent processes are executed.

When it is determined in step S11 that there are no packets to be multiplexed, the scheduler 8 ends the process.

As described above, according to the present invention, since the stream (for example, the video stream) whose contents are changed (for example, the bit rate is changed) and the other stream are divided, two buffers should be prepared. Good luck
The structure of the device can be simplified. Further, the calculation required for multiplexing is substantially the calculation of Tdiff (step S
13) and the calculation of the number N of packets (step S15), the multiplexing process can be performed quickly.

In the above, the case of recording the MPEG transport stream has been described as an example, but the case of recording the MPEG program stream will be described below.

At this time, the demultiplexer 2 extracts a stream forming a program selected by the program selection information from the MPEG program stream supplied from the tuner 1, and extracts the extracted stream based on the stream ID. Then, the video stream is decomposed into streams other than the video stream (streams including audio data and control data), the video stream is supplied to the video decoder 3, and the streams other than the video stream are supplied to the arrival time addition unit 6.

For example, when the MPEG program stream shown in FIG. 5A is input to the demultiplexer 2, for example, the arrival time adding unit 6 includes only packs of video streams, which are marked with "V" in the figure. The extracted audio data pack ("A") as shown in FIG. 5B.
Pack with ")" and control data pack "D"
A stream consisting of packs marked with is supplied. In this stream, the position of each pack (interval between packs) holds the state in the original MPEG program stream.

The video decoder 3 includes a demultiplexer 2
The video stream input from is decoded in accordance with the MPEG2 standard, and the resulting video signal is supplied to the video encoder 4. At this time, the video decoder 3 extracts the display time information incorporated in the video stream and supplies it to the scheduler 8.

The video encoder 4 is the video decoder 3
Video signal from MPEG at the required bit rate (eg lower than the original bit rate)
The video stream obtained as a result of encoding in accordance with the standard No. 2 is supplied to the multiplexer 9 via the buffer memory 5. At this time, the video encoder 4
The access unit information is supplied to the scheduler 8.

For example, when the stream shown in FIG. 2B is input to the arrival time adding unit 6, the pack has arrived at the recording device in a pack that constitutes a stream other than the video stream, as shown in FIG. 2C. Arrival time information indicating the time is added and stored in the buffer memory 7.

The scheduler 8 includes display time information input from the video decoder 3, access unit information input from the video encoder 4, and a multiplexer 9.
The multiplexing of the multiplexer 9 is controlled according to the multiplexing schedule based on the arrival time information (arrival time information added to the packs forming the streams other than the video stream) input from the. When controlling the multiplexing, the scheduler 8 supplies the arrival time information added to the packs forming the video stream to the multiplexer 9.

The multiplexer 9 performs multiplexing under the control of the scheduler 8 and, as a result,
The MPEG program stream as shown in FIG. 5D is supplied to the error correction unit 10.

The MPEG program stream recorded in this way is reproduced with the recording time interval held as shown in FIG. 5E.

Next, the operation of the scheduler 8 for storing the MPEG program stream will be described with reference to the flowchart of FIG.

In step S30, the scheduler 8
Is the time T0 required to multiplex one pack,
It is calculated based on the following formula. The pack length can be set to any length. Rmux is the multiplexing rate. T0 (sec) = pack length (bit) / Rmux (bps)

The time T0 calculated here is stored in the memory built in the scheduler 8.

Next, in step S31, the scheduler 8 determines whether or not there is a pack that has not been multiplexed, and if it is determined that there is a pack, that is, if the stream has not ended, step S32. Proceed to.

In step S32, the scheduler 8
Reads the arrival time information supplied from the multiplexer 9 (for example, the arrival time information of the pack Pcur that composes a stream other than the video stream read by the multiplexer 9 now), and represents the time represented by the time tcu.
Remember as r.

Next, in step S33, the scheduler 8 determines the time tcur and the arrival time information (pack Pcur) input from the multiplexer 9 in the previous processing here.
The difference Tdiff is calculated as shown in the following equation, using the time tprev that represents the arrival time information of the pack Pprev read from the buffer memory 7 by the multiplexer 9 immediately before. Tdiff = tprev-tcur

After that, the scheduler 8 stores the time tcur represented by the arrival time information of the pack Pcur as the time tprev.

In step S34, the scheduler 8
Determines whether Tdiff calculated in step S33 is greater than the value 0, and if it is determined to be larger, step S3
Go to step 5 and calculate the following formula to calculate Tdiff (pack Ppr
Compute the number N of packs of video streams that can be inserted (between ev and pack Pcur).

N = (Tdiff / T0) -1

In step S36, the scheduler 8
Determines whether the number N of packs calculated in step S35 is 0, and if it is determined not to be 0, step S
Proceed to 37.

In step S37, the scheduler 8
Confirms whether or not there is a free space in the P-STD buffer that can store one pack.
At 38, it is determined whether the pack of the video stream can be multiplexed based on the confirmation result. In addition,
Details of the process of step S37 will be described later.

If it is determined in step S38 that multiplexing is possible, the process proceeds to step S39, where the scheduler 8
Instruct the multiplexer 9 to perform multiplexing.

Next, in step S40, the scheduler 8 subtracts the value 1 from the number N of packs, and in step S41, the time obtained by adding the time T0 to the current time is set as the pack of the video stream. The arrival time information to be added is supplied to the multiplexer 9.

To unify the time scale, the arrival time addition unit 6 uses the arrival time information (time obtained by adding the time T0 to the current time) added to the pack of the video stream.
Converted to the time scale of.

Thereafter, the processing returns to step S36,
Subsequent processing is performed.

When the multiplexer 9 receives the multiplexing instruction from the scheduler 8 (step S39), it reads one pack of the video stream from the buffer memory 5 and receives the arrival time information (step S41) supplied from the scheduler 8 therein. Along with addition, pack Pprev
It is packed from and multiplexed (inserted).

If it is determined in step S38 that the packs of the video stream cannot be multiplexed, the process of step S39 is skipped and the process proceeds to step S40. That is, in this case, arrival time information is supplied to the multiplexer 9 in step S41, but since multiplexing is not instructed (step S39), multiplexing of packs of video streams is not performed.

If it is determined in step S36 that the number of packs N = 0, that is, if all packs that can be inserted into Tdiff have been inserted (multiplexed), the process proceeds to step S42 and the scheduler is executed. 8 indicates multiplexing of packs of streams other than video streams.

At this time, the multiplexer 9 sets the pack Pcur of streams other than the video stream in step S
The pack of the multiplexed video stream is multiplexed (inserted) following the instruction in the processing of 39.

Then, the process returns to step S31, and the subsequent processes are executed.

If it is determined in step S31 that there are no packs to be multiplexed, the scheduler 8
Terminates the process.

Next, the processing in step S17 of FIG. 3 or step S37 of FIG. 6 will be described. In addition,
Here, the process of step S37 of FIG. 6 will be described as an example.

FIG. 7 shows a configuration example of P-STD.

The pack of the video stream is input to the buffer 21 and is temporarily stored. The pack of the video stream stored in the buffer 21 includes the display time information (DTS (Decoding Time S
tamp)), the access unit (AU) (frame or field) is extracted at a timing when the time is reached and supplied to the decoder 22.

The access unit supplied to the decoder 22 is decoded there, and then directly or in the buffer 2.
It is output after being sorted by 3.

An audio stream pack is input to the buffer 24 and is temporarily stored therein. Buffer 2
The audio stream pack stored in 4 is extracted in access unit (frame) units at the timing when the display time information supplied from the video decoder 3 reaches the time and supplied to the decoder 25.

The access unit supplied to the decoder 25 is decoded there and then output.

In the above-described configuration example in which only the video stream is re-encoded, only the buffer of the video stream need be considered.

In the flowchart of FIG. 8, step S3
The details of the process in 7 are shown.

In step S50, it is determined whether or not the display time information of each access unit stored in the buffer 21 has a value of SCR (current time in FIG. 6) or more. If determined, the process proceeds to step S51, and the data amount for the access unit corresponding to the display time information of SCR or more is subtracted from the occupied amount of the buffer 21.

When it is determined in step S50 that the display time information of SCR or more does not exist, or in step S5
When the occupancy of the buffer 21 is subtracted in 1, the process proceeds to step S52.

In step S52, it is determined whether or not there is a free space for storing one pack in the buffer 21, and if it is determined that there is no free space, the process proceeds to step S53 and P-STD is stored. It is confirmed that there is no free space to store one pack.

On the other hand, if it is determined in step S52 that there is a space, the process proceeds to step S54, where the data amount for one pack is added to the occupied amount of the buffer 21, and then in step S55, the P-STD is added to the P-STD. It is confirmed that there is enough space to store one pack.

In step S53 or step S55,
When the empty state of the buffer 21 is confirmed, the process ends, and the process proceeds to step S38 in FIG.

FIG. 9 shows a structural example of another recording apparatus to which the present invention is applied. This recording apparatus is provided with two sets of the video decoder 3 to the buffer memory 5 of FIG. 1 (the video decoder 3-1 to the buffer memory 5-1.
And video decoder 3-2 to buffer memory 5-2
Is provided). That is, in this case, the MPEG transport stream or the MPEG program stream for two channels can be recorded as described above.

FIG. 10 is a block diagram showing the configuration of an embodiment of the computer 101 which functions as the recording / reproducing apparatus as described above. CPU (Central Processing Uni
t) 111 is connected to an input / output interface 116 via a bus 115, and the CPU 111 allows the user to input a keyboard,
When a command is input from the input unit 118 including a mouse or the like, for example, the recording medium such as the magnetic disk 131, the optical disk 132, the magneto-optical disk 133, or the semiconductor memory 134 mounted on the ROM 112, the hard disk 114, or the drive 120 is recorded. The stored program is loaded into the RAM 113 and executed. As a result, the various processes described above are performed. Furthermore, CPU11
1 outputs the processing result to the output unit 117 including an LCD (Liquid Crystal Display) or the like as needed, for example, via the input / output interface 116. In addition,
The program is stored in the hard disk 114 or the ROM 112 in advance and provided to the user integrally with the computer 101, or the magnetic disk 131, the optical disk 13 or the like.
2, it can be provided as a package medium such as the magneto-optical disk 133, the semiconductor memory 134, or can be provided to the hard disk 114 from a satellite, a network or the like via the communication unit 119.

[0098]

According to the multiplexing apparatus and method and the program of the present invention, the amount of data that can be inserted into the first multiplexed stream is calculated based on the arrival time of the first multiplexed stream. Since the data of the data amount is inserted into the first multiplexed stream and the second multiplexed stream is multiplexed, the data can be easily re-multiplexed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a recording apparatus to which the present invention has been applied.

FIG. 2 is a diagram illustrating a recording process of the recording apparatus in FIG.

FIG. 3 is a flowchart illustrating the operation of the scheduler of FIG.

FIG. 4 is a diagram for explaining the operation of the scheduler of FIG.

5 is another diagram for explaining the recording process of the recording apparatus in FIG. 1. FIG.

FIG. 6 is a flowchart illustrating another operation of the scheduler of FIG.

FIG. 7 is a block diagram showing a configuration example of P-STD.

FIG. 8 is a flowchart illustrating the process of step S37 of FIG.

FIG. 9 is a diagram showing another configuration example of a recording apparatus to which the present invention has been applied.

FIG. 10 is a block diagram showing a configuration example of a personal computer 101.

[Explanation of symbols]

1 tuner, 2 demultiplexer, 3 video decoder, 4 video encoder, 5 buffer memory, 6 arrival time addition unit, 7 buffer memory,
8 scheduler, 9 multiplexer, 10
Error correction unit, 11 modulation unit, 12 recording head, 1
3 recording media

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Motoki Kato             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Yoshikazu Takashima             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F term (reference) 5C063 AB03 AB07 AC01 AC05 AC10                       CA11 CA23                 5K028 AA11 EE05 KK01 KK12 LL15                       MM05 SS05 SS15 SS24

Claims (4)

[Claims] 1. A multiplexing device for re-multiplexing a bitstream, the calculating means for calculating the amount of data that can be inserted into the first multiplexed stream based on the arrival time of the first multiplexed stream, A multiplexing device for inserting the data for the data amount calculated by the calculating device into the first multiplexed stream and multiplexing the second multiplexed stream. . 2. A multiplexing method of a multiplexer for re-multiplexing a bitstream, wherein a calculation for calculating the amount of data that can be inserted into the first multiplexed stream is based on the arrival time of the first multiplexed stream. And a multiplexing step of inserting the data for the data amount calculated in the processing of the calculation step into the first multiplexed stream and multiplexing the second multiplexed stream. Characteristic multiplexing method. 3. A program of a multiplexer for re-multiplexing a bitstream, said first first stream being based on the arrival time of the first multiplexed stream.
A calculation control step for controlling the calculation of the amount of data that can be inserted into the multiplexed stream, and by inserting the data for the amount of data calculated in the processing of the calculation control step into the first multiplexed stream, A recording medium having a computer-readable program recorded thereon, the recording medium including a multiplexing control step of controlling multiplexing of a second multiplexed stream. 4. A program of a multiplexer for re-multiplexing a bitstream, said first first stream being based on the arrival time of the first multiplexed stream.
A calculation control step for controlling the calculation of the amount of data that can be inserted into the multiplexed stream, and by inserting the data for the amount of data calculated in the processing of the calculation control step into the first multiplexed stream, A program for causing a computer to execute a process including a multiplexing control step of controlling multiplexing of a second multiplexed stream.