JP2004248104A - Information processor and information processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize lip-synchronization deviation that occurs by "connection recording". <P>SOLUTION: Overflowed time information Te being the difference between time information at a connection point X of video data recorded beforehand in a recording medium and time information at a connection point Y of audio data is calculated, compressively encoding timing of audio data to be newly recorded on the recording medium 50 is shifted with respect to compressively encoding timing of the video data for the overflowed time information Te, and the video data and audio data subjected to compressive encoding are recorded on the recording medium 50. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information processing apparatus and an information processing method for recording video data and audio data encoded by the MPEG method on a recording medium.
[0002]
[Prior art]
A recording device for recording video data and audio data compressed and encoded by a moving picture encoding method such as an MPEG (Moving Picture Expert Group) method, for example, an MPEG2 method, on a magnetic recording medium has been devised (for example, Patent Reference 1).
[0003]
[Patent Document 1]
JP 2001-309305 A
[0004]
[Problems to be solved by the invention]
By the way, when decoding and reproducing video data and audio data that have been compression-encoded by the MPEG method, it is necessary to perform lip sync that matches the movement of the mouth with the audio timing.
[0005]
In the MPEG system, in order to synchronize video data and audio data, a video PES (Packetized Elementary Stream) packet and an audio PES packet, and a PTS (Presentation Time Stamp) as playback time information in each PES header. And control information such as DTS (Decoding Time Stamp) for specifying a decoding timing. Then, at the time of decoding and reproduction, the control information is extracted, and video data and audio data are synchronized based on the extracted control information so that a lip-sync shift does not occur.
[0006]
The video data usually has a video frame of a fixed length (time) such as 1/30 seconds or 1/25 seconds.
[0007]
On the other hand, the audio data is continuous and has no delimiter other than the sample points, but has an audio frame of a specific length to determine the calculation range when compressing and encoding the audio data by the MPEG method. Is formed.
[0008]
The frame length (time axis length) of the video frame and the audio frame hardly becomes equal.
[0009]
Therefore, when new video data and audio data that have been compression-encoded are “joined and recorded” from arbitrary portions of video data and audio data that have been recorded in advance on the magnetic recording medium, the audio data is It will be recorded discontinuously in time.
[0010]
As described above, when the “join recording” is performed, the decoding timing and the output timing are recorded on the magnetic recording medium beyond the range that can be controlled by the DTS and the PTS, and the lip-sync deviation becomes unusable. There is a problem that occurs.
[0011]
Furthermore, since audio data is recorded on a magnetic recording medium in a discontinuous manner with time, there is a problem that decoding processing during reproduction may not be performed normally. In particular, when the magnetic recording medium on which the video data and the audio data are “joined-recorded” as described above is played back by, for example, an external device, the external device causes the magnetic recording medium to be discontinuous in time. However, there is a problem that it is not possible to know that audio data is recorded in the audio data, so that normal decoding processing cannot be expected.
[0012]
Therefore, the present invention has been devised in order to solve the above-described problem. Even when video data and audio data are compression-encoded and “join recording” is performed, the lip sync deviation is minimized. An information processing apparatus for recording video data and audio data on a recording medium so that the video data and audio data are recorded on a recording medium so that the video data and audio data are normally decoded by an external device. And an information processing method.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, an information processing apparatus according to the present invention comprises: a compression encoding unit for compressing and encoding video data and audio data according to an MPEG system; And a recording means for recording the video data on a recording medium, wherein video data and audio data are newly recorded from an arbitrary position designated on the recording medium in which video data is newly recorded, and When splicing and recording audio data, the video data and the first header information, which are header information of the audio data, recorded near the specified position are respectively detected. Second header which is header information of video data and audio data recorded immediately before the header information of Header information detecting means for respectively detecting the video information, video data reproduction end time information using the second header information detected by the header information detection means as header information, and audio data reproduction end time information. Further, a protruding time information calculating means for calculating protruding time information which is a difference between the reproduction end time information of the video data and the reproduction end time information of the audio data, and a video data to be newly recorded on the recording medium. A video data compression encoding start instruction for starting compression encoding is generated and output to the compression encoding unit, and the video data compression encoding start instruction is output to the compression encoding unit, and thus the protruding time is determined. After the elapse of the protruding time calculated by the information calculation means, the audio to be newly recorded on the recording medium Compression encoding instruction generating means for generating an audio data compression encoding start instruction for starting compression encoding of data and outputting the generated instruction to the compression encoding means; video data compressed and encoded by the compression encoding means; Recording data stream generating means for generating a recording data stream including audio data and PTS (Presentation Time Stamp) and DTS (Decoding Time Stamp) included in header information of the recording data stream generated by the recording data stream generating means. ) Is updated to be continuous with the PTS and DTS included in the second header information, and the recording data stream in which the header information is updated by the header information updating means is header And a controlling means for controlling said recording means so as to be recorded from the position of the detected said first header information by broadcast detecting means.
[0014]
Further, in order to achieve the above object, an information processing method according to the present invention comprises: a compression encoding unit for compressing and encoding video data and audio data according to an MPEG method; An information processing method for an information processing apparatus comprising: a recording unit that records audio data on a recording medium, wherein video data and audio data are recorded in advance from an arbitrary position specified on the recording medium. When newly connecting and recording video data and audio data, the video data recorded near the specified position and the first header information that is header information of audio data are respectively detected, Header information of video data and audio data recorded immediately before the detected first header information. Header information detecting step for detecting the second header information, video data playback end time information using the second header information detected in the header information detection step as header information, and audio data playback end Time information, and furthermore, an overflow time information calculating step of calculating overflow time information that is a difference between the video data playback end time information and the audio data playback end time information; A video data compression encoding start instruction for starting the compression encoding of the video data to be recorded is output to the compression encoding means, and the video data compression encoding start instruction is output to the compression encoding means. Then, after the protruding time calculated by the protruding time information calculating step has elapsed, the recording medium is newly written. A compression encoding instruction generating step of generating an audio data compression encoding start instruction for starting compression encoding of audio data to be recorded and outputting the instruction to the compression encoding means; and a video encoded by the compression encoding means. A recording data stream generating step of generating a recording data stream including data and audio data; PTS (Presentation Time Stamp) and DTS (Decoding) included in header information of the recording data stream generated by the recording data stream generating step. Time stamp) is updated to be continuous with the PTS and DTS included in the second header information, respectively, and the recording data stream in which the header information is updated by the header information updating step is updated. Over arm, characterized in that a control step for controlling said recording means so as to be recorded from the position of the header information detection process in the first header information detected by.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of an information processing apparatus and an information processing method according to the present invention will be described in detail with reference to the drawings.
[0016]
First, a configuration of an information processing apparatus shown as an embodiment of the present invention will be described with reference to FIG.
[0017]
The information processing apparatus 1 includes an external input unit 11, an MPEG encoder 12, a header information extraction unit 13, a stream recording processing unit 14, an MPEG encoder control unit 15, a PTS / DTS update processing unit 16, a pseudo data generation It includes a unit 17, an ECC processing unit 18, a recording circuit 19, a reproduction circuit 20, a stream reproduction processing unit 21, an external output unit 22, an MPEG decoder 23, and a control unit 24.
[0018]
The information processing device 1 records video data and audio data that are compression-encoded by the MPEG method on a tape-shaped magnetic recording medium 50 that is detachable from the information processing device 1, and reproduces the recorded video data and audio data. It is a possible device.
[0019]
Further, the information processing apparatus 1 can freely perform “join recording” in which new video data and audio data are overwritten on an arbitrary portion of the tape-shaped magnetic recording medium 50 on which video data and audio data are recorded in advance. Can be
[0020]
The external input unit 11 reconstructs MPEG compression-encoded video data and audio data, which are multiplexed into a TS (Transport Stream) and transmitted from the outside, into a video PES packet and an audio PES packet. To supply.
[0021]
The MPEG encoder 12 compression-encodes (encodes) digital video data and digital audio data according to the MPEG system to generate a video ES (Elementary Stream) and an audio ES. The MPEG encoder 12 divides the encoded video ES and audio ES into video PES packets and audio PES packets, and supplies the video PES packets and audio PES packets to the stream recording processing unit 14.
[0022]
The MPEG encoder 12 performs the encoding process while adjusting the generated code amount of the picture based on the detected data occupation amount of a VBV (Video Buffering Verifier) buffer.
[0023]
The VBV buffer is a buffer virtually provided in the preceding stage of the decoder, and serves as a guide when adjusting the encoding amount at the time of encoding by referring to the occupation amount of the VBV buffer.
[0024]
For example, in a decoding process, a picture to be decoded is temporarily stored in a VBV buffer for a certain period of time, and when a decoding time comes, data for one picture is read from the VBV buffer and a decoding process is performed. Is assumed.
[0025]
At this time, if the amount of coding of the picture is enormous, the VBV buffer underflows and a delay occurs when displaying the picture. In addition, if the amount of generated coding of a picture is small, the VBV buffer overflows and the VBV buffer breaks down.
[0026]
As described above, in order to prevent a failure such as underflow or overflow of the VBV buffer from occurring, the generated code amount of a picture to be encoded by the MPEG encoder 12 is set to a target value for each picture by operating a quantization parameter, for example. Adjust so that it becomes the code amount.
[0027]
If the operation of the quantization parameter is not sufficient, a copy picture (Copy Picture) having a small code amount obtained by copying a picture that is temporally preceding in the data stream to be decoded, or a stuffing byte which is particularly meaningless data is used. To adjust the decoding timing and the amount of data. If the VBV buffer overflows, a stuffing byte is inserted. If the VBV buffer underflows, a copy picture is inserted.
[0028]
The header information extraction unit 13 includes video data and audio data PTS, DTS, and frame length information reproduced from the tape-shaped magnetic recording medium 50 via the reproduction circuit 20, the ECC processing unit 18, and the stream reproduction processing unit 21. Extract header information. The PTS and the DTS are header information provided for each access unit of video data and audio data, that is, for each frame. PTS is time information for reproducing and outputting video data and audio data recorded on the tape-shaped magnetic recording medium 50, respectively, and DTS is time information for decoding video data and audio data, respectively.
[0029]
When an instruction to perform “join recording” is issued at an arbitrary position on the tape-shaped magnetic recording medium 50, the header information extraction unit 13 records the nearest position to the above-specified arbitrary position under the control of the control unit 24. The header information is read out. The position of the header information is a connection point at which “connection recording” starts.
[0030]
Further, the header information extraction unit 13 controls the header of the video data (hereinafter also referred to as final video data) immediately before the connection point and the audio data (hereinafter also referred to as final audio data) under the control of the control unit 24. Extract each piece of information. The header information extracted by the header information extraction unit 13 is sent to the stream recording processing unit 14.
[0031]
The stream recording processing unit 14 multiplexes video PES packets and audio PES packets supplied from the external input unit 11 or the MPEG encoder 12 to generate a data stream to be recorded on the tape-shaped magnetic recording medium 50.
[0032]
Further, the stream recording processing unit 14 calculates the overflow time using the header information sent from the header information extracting unit 13.
[0033]
Here, the protruding time will be described. The protruding time indicates a shift amount of a display time between video data recorded in advance on the tape-shaped magnetic recording medium 50 and audio data recorded corresponding to the video data.
[0034]
Specifically, a connection point X when new video data is "joined-recorded" to video data recorded on the tape-shaped magnetic recording medium 50 shown in FIG. The amount of deviation from the connecting point Y when new audio data is “joined-recorded” to the audio data shown in FIG. 2B and recorded on the tape-shaped magnetic recording medium 50 is referred to as “protruding time”.
[0035]
As described above, since the frame length of video data and the frame length of audio data compressed and encoded by the MPEG system are different from each other, the PTS of the audio data is delayed from the PTS of the video data, and the It is extremely often recorded on the magnetic recording medium 50.
[0036]
That is, as shown in FIGS. 2A and 2B, the audio data recorded on the tape-shaped magnetic recording medium 50 has a lip-sync shift with respect to the video data, and the video data is reproduced. Is completed, the reproduction of the audio data does not end.
[0037]
The stream recording processing unit 14 calculates the protruding time described with reference to FIGS. 2A and 2B using the header information of the final video data and the final audio data extracted by the header information extracting unit 13. .
[0038]
If the PTS included in the header information of the final video data is Tve, the frame length is VF, the PTS included in the header information of the final audio data is Tae, and the frame length is AF, the protruding time Te is expressed by the equation (1). It can be calculated as follows.
[0039]
Te = (Tae + AF)-(Tve + VF) (1)
[0040]
The value calculated by Tae + AF in the expression (1) is time information at which the reproduction of the final audio data ends, that is, time information at a connection point Y of the audio data. The value calculated by Tve + VF is the time information at which the reproduction of the final video data ends, that is, the time information at the connection point X of the video data.
[0041]
The value of the overflow time Te calculated by the stream recording processing unit 14 is sent to the MPEG encoder control unit 15.
[0042]
When the pseudo data generation unit 17 described later generates pseudo data for video data, the overrun time Te calculated as in the above equation (1) is determined by the frame length of the generated pseudo data. It is calculated taking into account.
[0043]
That is, assuming that the frame length of the pseudo data is GF, the overflow time Te is calculated as shown in Expression (2).
[0044]
Te = (Tae + AF)-(Tve + VF + GF) (2)
[0045]
The MPEG encoder control unit 15 generates an encoding start command for instructing the MPEG encoder 12 to start encoding video data and audio data, and outputs the command to the MPEG encoder 12. The MPEG encoder control unit 15 generates an encoding start command for each of the video data and the audio data.
[0046]
First, the MPEG encoder control unit 15 generates an encoding start command for video data in response to the “join recording” start instruction sent from the control unit 24, and sends it to the video encoder 12a.
[0047]
Subsequently, the MPEG encoder control unit 15 sends an encoding start command for the video data, and after an overflow time Te generated by the stream recording processing unit 14, generates an encoding start command for the audio data, and sends the encoding start command to the audio encoder 12b. Send out.
[0048]
As described above, the start time of the encoding by the audio encoder 12b is delayed by the protruding time Te for the following reason.
[0049]
For example, suppose that video data and audio data as shown in FIGS. 3A and 3B are newly recorded on the tape-shaped magnetic recording medium 50.
[0050]
In the video data shown in FIG. 3A, the PTS of the video data of the head frame (hereinafter, also referred to as head video data) is Tvs, and the audio data of the head frame in the audio data shown in FIG. The PTS of (hereinafter, also referred to as head audio data) is Tas.
[0051]
The audio data shown in FIG. 3B is delayed from the video data shown in FIG. 3A by a delay time Ts. The delay time Ts can be expressed by Expression (3) using Tvs, which is the PTS of the head video data, and Tas, which is the PTS of the head audio data.
[0052]
Ts = Tas-Tvs (3)
[0053]
If the delay time Ts has a relationship of Te> Ts or a relationship of Te <Ts with the protruding time Te, the audio data to be newly recorded is recorded in advance on the tape-shaped magnetic recording medium 50. The recorded audio data is recorded discontinuously in time. As described above, if the audio data is recorded on the tape-shaped magnetic recording medium 50 so as to be discontinuous in time, a normal decoding process cannot be performed.
[0054]
If the delay time Ts and the protruding time Te are the same time, that is, if the relationship of Ts = Te is satisfied, the audio data newly recorded on the tape-shaped magnetic recording medium 50 becomes temporally continuous. Will be recorded.
[0055]
Then, the MPEG encoder control unit 15 delays the encode start command by the overrun time Te so that the audio data to be “joined-recorded” is delayed from the video data encoding process by overrun time Te, and sends the audio start command to the audio encoder 12b. Send out.
[0056]
The PTS / DTS update processing unit 16 stores the PTS and DTS of the video PES packet and the audio PES packet of the data stream generated by the stream recording processing unit 14 in the “linkage recording” recorded on the tape magnetic recording medium 50. The base data is updated so as to be temporally continuous according to the PTS and DTS of the underlying data.
[0057]
The pseudo data generation unit 17 generates pseudo data, such as a copy picture and a stuffing byte, to be inserted into video data after the connection point when preventing the above-described failure of the VBV buffer. Since the failure of the VBV buffer as described above occurs when the generated code amount changes extremely, a copy picture or a stuffing byte is often inserted at a connection point of “connection recording”.
[0058]
The ECC processing unit 18 performs an error correction coding process and an interleave process on the data stream transmitted from the stream recording processing unit 14, and transmits the data stream to the recording circuit 19. Further, the ECC processing unit 18 performs a deinterleave process and an error correction decoding process on the data stream transmitted from the reproduction circuit 20, and transmits the data stream to the stream reproduction processing unit 21.
[0059]
Specifically, the ECC processing unit 18 has an ECC Bank memory (not shown), and temporarily buffers a data stream to be recorded on the tape-shaped magnetic recording medium 50 or a data stream to be reproduced, and executes the above-described processing.
[0060]
The recording circuit 19 performs a recording process of recording the data stream transmitted from the ECC processing unit 18 on the tape-shaped magnetic recording medium 50. For example, the recording circuit 19 converts the data stream into serial data, amplifies the data stream, and records the amplified data on a tape-shaped magnetic recording medium 50 rotated by a rotating drum (not shown) via a magnetic head (not shown).
[0061]
The reproducing circuit 20 performs a reproducing process for reproducing the data stream recorded on the tape-shaped magnetic recording medium 50. The data stream reproduced by the reproduction circuit 20 is sent to the ECC processing unit 18.
[0062]
The stream reproduction processing unit 21 demultiplexes the data stream supplied from the ECC processing unit 18 and separates the data stream into video PES packets and audio PES packets.
[0063]
The PTS extraction unit 22 extracts the PTS from the demultiplexed video PES packet and audio PES packet in the stream reproduction processing unit 21 and sends the PTS to the stream recording unit 14.
[0064]
The external output unit 22 divides a video PES packet and an audio PES packet supplied from the stream reproduction processing unit 21 to generate a TS packet, and multiplexes the TS packet to generate a TS.
[0065]
The MPEG decoder 23 generates a video ES and an audio ES from the video PES packet and the audio PES packet supplied from the stream reproduction processing unit 21, respectively, and performs decompression decoding processing on the MPEG data into digital video data and digital audio data. .
[0066]
The control unit 24 controls each unit of the information processing apparatus 1 in an integrated manner. The control unit 24 controls the operation of each unit, for example, when performing the above-described “join recording”, and records video data and audio data that have been compression-encoded by the MPEG method on the tape-shaped magnetic recording medium 50. Let it.
[0067]
Subsequently, using the flowchart shown in FIG. 4, in the information processing apparatus 1 according to the embodiment of the present invention, when "joint recording" for recording new video data and audio data on the tape-shaped magnetic recording medium 50, Will be described.
[0068]
First, in step S1, when the user issues an instruction to perform “join recording” at an arbitrary position on the tape-shaped magnetic recording medium 50, the control unit 24 starts the reproduction circuit 20, the ECC processing unit 18, the stream reproduction process. The section 21 is controlled so as to reproduce the vicinity of the arbitrary position on the tape-shaped magnetic recording medium 50.
[0069]
In step S2, the control unit 24 controls the header information extraction unit 13 to read out the header information recorded closest to the specified position, and set a connection point at which "connection recording" starts. decide.
[0070]
In step S3, the control unit 24 controls the header information extracting unit 13 to extract the header information of the final video data and the final audio data, which are the video data and the audio data immediately before the connection point, and perform stream recording. It is sent to the processing unit 14.
[0071]
In step S4, the stream recording processing unit 14 uses the PTS and frame length information of the video data and the PTS and frame length information of the audio data from the extracted header information to calculate the protruding time from the expression (1) described above. Te is generated and sent to the MPEG encoder control unit 15.
[0072]
When the pseudo data generation unit 17 generates pseudo data for video data, the stream recording processing unit generates an overflow time Te from Expression (2) that also takes into consideration the frame length of the pseudo data, and controls the MPEG encoder control. To the unit 15.
[0073]
In step S5, the control unit 24 generates a connection recording start command, which is an instruction to start “connection recording”, and sends it to the MPEG encoder control unit 15.
[0074]
In step S6, the MPEG encoder control unit 15 generates an encode start command which is an instruction to start encoding processing of video data to be “joined-recorded” in response to the joint recording start command sent from the control unit 24. , To the video encoder 12a.
[0075]
In step S7, the video encoder 12a compresses and encodes video data to be newly recorded on the tape-shaped magnetic recording medium 50 by the MPEG method, and sends the encoded data to the stream recording processing unit 14.
[0076]
In step S8, the MPEG encoder control unit 15 determines whether or not the overflow time Te has elapsed since the generation of the encoding start command which is a command to start the encoding processing of the video data. If the overrun time Te has elapsed, the process proceeds to step S9; otherwise, the process waits until the overrun time Te is reached.
[0077]
In step S9, the MPEG encoder control unit 15 sends an encoding start command to the video encoder 12a, and starts an encoding process of audio data to be “joined-recorded” in response to a lapse of the protruding time Te. Is generated and transmitted to the audio encoder 12b. At this time, the MPEG encoder control unit 15 sends out the encoding start command in the audio encoder 12b in consideration of the delay time from the reception of the command to the start of the processing.
[0078]
In step S10, the audio encoder 12b compresses and encodes the audio data to be newly recorded on the tape-shaped magnetic recording medium 50 by the MPEG method, and sends it to the stream recording processing unit 14.
[0079]
In step S11, the stream recording processing unit 14 multiplexes the video data and the audio data compressed and encoded by the video encoder 12a and the audio encoder 12b into a data stream to be recorded on the tape-shaped magnetic recording medium 50.
[0080]
In step S12, the PTS / DTS update processing unit 16 performs the PTS and DTS of the video data and the audio data of the data stream multiplexed by the stream recording processing unit 14, and the header information added to each frame. Is updated so as to be continuous with the underlying video data and audio data PTS and DTS recorded on the tape-shaped magnetic recording medium 50 to be “join-recorded”.
[0081]
In step S13, the control unit 24 sends the data stream generated by the stream recording processing unit 14 to the ECC processing unit 18 and records the data stream on the tape-shaped magnetic recording medium 50 via the recording circuit 19.
[0082]
In this way, the start time of the encoding process in the audio encoder 12b is extended from the encoding start time in the video encoder 12a by the stream recording processing unit 14 using the expression (1) or (2). By delaying by the time Te, the PTS of the audio data to be recorded on the tape-shaped magnetic recording medium 50 can be recorded temporally continuously.
[0083]
As described above, the information processing apparatus 1 performs the “joint recording”, the final video data of the video data and the audio data previously recorded on the tape-shaped magnetic recording medium 50, and the header of the final audio data. By calculating the protruding time Te from the information and delaying the encoding start time of the audio data by the calculated protruding time Te, the audio data can be recorded on the tape-shaped magnetic recording medium 50 continuously in time.
[0084]
This makes it possible to minimize the lip-sync deviation at the time of reproduction, and even when the video data and the audio data “spliced and recorded” on the tape-shaped magnetic recording medium 50 are reproduced by an external device or the like. , Normal decoding processing can be expected.
[0085]
【The invention's effect】
As is clear from the above description, according to the present invention, at the time of “join recording” on a recording medium, a joining point for recording new video data and audio data, video data recorded immediately before, and The protruding time information is calculated from the header information of the audio data, the compression encoding process of the audio data is delayed by the protruding time with respect to the compression encoding process of the video data, and the new video data and audio data are recorded on a recording medium. Record.
[0086]
Therefore, the video data and the audio data recorded in "join recording" are recorded on the recording medium with the PTS interval continuously, so that even when the MPEG decoder of the external device is used at the time of reproduction, the decoding process is normally performed. It is possible to do.
[0087]
In addition, even if the “link recording” is performed, a new lip-sync deviation can be prevented from being generated. Therefore, even when the “link recording” is repeated a plurality of times, the lip-sync deviation is prevented from being accumulated. To make things possible.
[Brief description of the drawings]
FIG. 1 is a diagram for describing a configuration of an information processing apparatus shown as an embodiment of the present invention.
FIG. 2 is a diagram for explaining an overflow time.
FIG. 3 is a diagram showing an example of audio data newly recorded on a tape-shaped magnetic recording medium and video data in the information processing apparatus shown as an embodiment of the present invention.
FIG. 4 is a flowchart for explaining an operation at the time of “join recording” on a tape-shaped magnetic recording medium in the information processing apparatus.
[Explanation of symbols]
Reference Signs List 1 information processing device, 11 external input unit, 12 MPEG encoder, 12a video encoder, 12b audio encoder, 13 header information extraction unit, 14 stream recording processing unit, 15 MPEG encoder control unit, 16 PTS / DTS update processing unit, 17 pseudo Data generation unit, 18, ECC processing unit, 19 recording circuit, 21 stream reproduction processing unit, 50 tape-shaped magnetic recording medium

Claims (6)

An information processing apparatus comprising: compression encoding means for compressing and encoding video data and audio data in an MPEG system; and recording means for recording the compression-encoded video data and audio data on a recording medium. ,
When newly connecting video data and audio data from an arbitrary position specified on the recording medium in which video data and audio data are recorded in advance, recording near the arbitrary position specified above First header information, which is header information of the detected video data and audio data, respectively, and further, header information of the video data and audio data recorded immediately before the detected first header information. Header information detecting means for respectively detecting second header information,
It calculates video data playback end time information and audio data playback end time information using the second header information detected by the header information detection means as header information, and further comprises the video data playback end time information. And a protruding time information calculating means for calculating protruding time information that is a difference between the reproduction end time information of the audio data and
Generating a video data compression encoding start command for starting compression encoding of video data to be newly recorded on the recording medium and outputting the instruction to the compression encoding means;
After the video data compression / encoding start command is output to the compression / encoding means, the compression code of audio data to be newly recorded on the recording medium after a lapse of the overflow time calculated by the overflow time information calculation means. Compression encoding instruction generating means for generating an audio data compression encoding start instruction for starting the encoding and outputting the instruction to the compression encoding means,
Recording data stream generating means for generating a recording data stream including video data and audio data compressed and encoded by the compression encoding means,
The PTS (Presentation Time Stamp) and DTS (Decoding Time Stamp) included in the header information of the recording data stream generated by the recording data stream generating means are respectively added to the PTS and DTS included in the second header information. Header information updating means for updating to be continuous,
Control means for controlling the recording means such that the recording data stream in which the header information is updated by the header information updating means is recorded from the position of the first header information detected by the header information detecting means; An information processing apparatus comprising: The protruding time information calculating means adds the PTS of the video data included in the second header information detected by the header information detecting means and the frame length information of the video data to obtain the reproduction end time information of the video data. Calculate,
The protruding time information calculating means calculates the audio data reproduction end time information by adding the PTS of the audio data included in the header information detected by the header information detecting means and the frame length information of the audio data. The information processing apparatus according to claim 1, wherein: Pseudo video data generating means for generating pseudo video data generated in accordance with the generated code amount of the video data to be seamlessly recorded and inserted at a position to be seamlessly recorded,
The protruding time information calculating means adds the PTS of the video data included in the second header information detected by the header information detecting means and the frame length information of the video data, and further comprises the pseudo video data generating means. 3. The information processing apparatus according to claim 2, wherein the reproduction end time information of the video data is calculated by adding the frame length information of the pseudo video data generated in the step (c). Information processing of an information processing apparatus comprising: compression encoding means for compressing and encoding video data and audio data according to the MPEG system; and recording means for recording the compressed and encoded video data and audio data on a recording medium. The method,
When newly connecting video data and audio data from an arbitrary position specified on the recording medium in which video data and audio data are recorded in advance, recording near the arbitrary position specified above First header information, which is header information of the detected video data and audio data, respectively, and further, header information of the video data and audio data recorded immediately before the detected first header information. A header information detecting step of detecting each of the second header information,
Calculate video data playback end time information and audio data playback end time information using the second header information detected in the header information detection step as header information, and further calculate the video data playback end time information. And a protruding time information calculating step of calculating protruding time information that is a difference between the reproduction end time information of the audio data and
Generating a video data compression encoding start command for starting compression encoding of video data to be newly recorded on the recording medium and outputting the instruction to the compression encoding means;
After the video data compression / encoding start command is output to the compression / encoding means, after the protruding time calculated by the protruding time information calculating step, the compression code of the audio data to be newly recorded on the recording medium is passed. A compression encoding instruction generating step of generating an audio data compression encoding start instruction for starting the encoding and outputting the instruction to the compression encoding means;
A recording data stream generating step of generating a recording data stream including video data and audio data compressed and encoded by the compression encoding means,
The PTS (Presentation Time Stamp) and DTS (Decoding Time Stamp) included in the header information of the recording data stream generated in the recording data stream generation step are respectively added to the PTS and DTS included in the second header information. A header information updating step of updating to be continuous,
A control step of controlling the recording means so that the recording data stream in which the header information is updated by the header information updating step is recorded from the position of the first header information detected by the header information detecting step. An information processing method comprising: The protruding time information calculating step includes adding the PTS of the video data included in the second header information detected in the header information detecting step and the frame length information of the video data to obtain the reproduction end time information of the video data. Calculate,
Also, the protruding time information calculating step calculates the reproduction end time information of the audio data by adding the PTS of the audio data included in the header information detected in the header information detecting step and the frame length information of the audio data. 5. The information processing method according to claim 4, wherein: A pseudo video data generating step of generating pseudo video data that is generated in accordance with the generated code amount of the video data to be seamlessly recorded and inserted at a position to be seamlessly recorded,
The protruding time information calculating step adds the PTS of the video data included in the second header information detected in the header information detecting step and the frame length information of the video data, and further includes the pseudo video data generating step. 6. The information processing method according to claim 5, wherein the reproduction end time information of the video data is calculated by adding the frame length information of the pseudo video data generated in the step (c).

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