CN108009035A - A kind of MP4 file corruptions detection method and device - Google Patents

A kind of MP4 file corruptions detection method and device Download PDF

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CN108009035A
CN108009035A CN201610926517.2A CN201610926517A CN108009035A CN 108009035 A CN108009035 A CN 108009035A CN 201610926517 A CN201610926517 A CN 201610926517A CN 108009035 A CN108009035 A CN 108009035A
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files
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CN108009035B (en
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苏许臣
孙伟芳
朱立松
黄建杰
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CCTV INTERNATIONAL NETWORKS WUXI Co Ltd
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751—Error or fault detection not based on redundancy

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Abstract

The present invention provides a kind of MP4 file corruptions detection method and device, it is related to detection technique field, wherein, the present invention proposes a kind of to detect the method and system of MP4 file corruptions based on being scanned MP4 file binary system byte data, the present invention by by MP4 file binary system byte data slots with it is default contrast byte compared with, if there is identical situation, then represent that MP4 files have damage, and obtain file corruption position by calculating, decoding detection is carried out to MP4 files as starting point to damage position again, it is time-consuming present invention obtains detection is reduced, reduce the technique effect of hardware resource consumption.

Description

A kind of MP4 file corruptions detection method and device
Technical field
The present invention relates to detection technique field, more particularly to a kind of MP4 file corruptions detection method and device.
Background technology
MP4 files are being recorded, when editor and transmission, it is possible to are damaged.And the MP4 files damaged are being broadcast Occur that mosaic, interim card, frozen frame and sound draw the problems such as asynchronous when putting, directly affect viewing experience.
Nowadays common MP4 file test methods are that MP4 files are decapsulated and decoded, if damage occurs Encapsulated layer, then will report an error during decapsulation；In the event of in coding layer, then will report an error, but decapsulate when decoding Conciliating code detection method has detection process to take the shortcomings that long and hardware resource consumption is excessive.
The content of the invention
For it is above-mentioned to MP4 files by decapsulating and decoding is detected, take long and hardware resource consumption mistake The problem of big, the present invention provides a kind of file test method.
Technical solution provided by the invention is as follows：
A kind of MP4 file corruptions detection method, including：
S1：Read the binary system byte data in MP4 files to be measured；
S2：Binary system byte data described in length segmentation S1 with default contrast byte, obtain binary system byte data Fragment；
S3：The binary system byte data slot is subjected to content comparison with default contrast byte one by one；
If identical, stopping is compared, and represents file corruption.
Further, the content of the default contrast byte is 0.
Further, the binary system byte data read in S1 in MP4 files to be measured include：
Binary system byte data in MP4 files to be measured are read with preset byte length.
Further, the preset byte length is the integral multiple of default contrast byte length.
Further, S3 is further included：
When content is more identical, calculates and record file corruption position percentage.
Further, the calculation document damage position percentage formula is as follows：
Wherein, pt is file corruption position percentage, and dL is default contrast byte length, and rN is the binary word contrasted Data slot number is saved, sL is the binary system byte data overall length of MP4 files.
Further, the MP4 file corruptions detection method is further included when S3 judges MP4 file corruptions：
S4：Read MP4 file video lengths；
S5：Calculation document damages time point；
S6：The MP4 files are decoded since file corruption time point；
S7：Judge whether successfully decoded；
If failure；Then represent MP4 file corruptions.
Further, the formula at the damage time point of calculation document described in S5 is as follows：
P=pt*sT
Wherein, p is the file corruption time point, and pt is file corruption position percentage, and sT is the MP4 files Video length.
A kind of MP4 file corruptions detection device, including：
Byte read module, byte segmentation module and byte comparison module；
Wherein, the byte read module is used to read the binary system byte data in MP4 files；
The byte splits module, is connected with the byte read module, and the byte segmentation module is with default contrast word The length of section splits the binary system byte data in the MP4 files of reading；
The byte comparison module, is connected with byte segmentation module, and the byte comparison module is used to that institute will to be split The binary system byte data slot obtained compared with default contrast byte, judges file corruption one by one when identical.
Further, the byte comparison module includes：Comparing unit, computing unit and storage unit；
Wherein, the comparing unit, is connected with byte segmentation module, and the comparing unit is used to that gained will to be split Binary system byte data slot compared with default contrast byte, judges file corruption one by one when identical；
The computing unit, is connected with the comparing unit, comparison knot of the computing unit based on the comparing unit Fruit, when comparative result is identical, calculation document damages position percentage；
The storage unit, is connected with the computing unit, and the storage unit is used to store the computing unit calculating File corruption position percentage.
Further, further include：Duration read module and decoding process module；
Wherein, the duration read module, for reading MP4 file video lengths；
The decoding process module, is connected with the byte comparison module and the duration read module respectively, described Decoding process module is used to decode MP4 files.
Further, the decoding process module includes：Damage time point computing unit and decoding unit；
Wherein, the damage time point computing unit, reads mould with the byte comparison module and the duration respectively Block connects, and the damage time point computing unit is used for the time point of calculation document damage position；
The decoding unit, is connected with the damage time point computing unit, when the decoding unit is based on the damage Between put computing unit calculate file corruption position time point MP4 files are decoded.
MP4 file corruptions detection method and device provided by the invention, can bring following beneficial effect：
In the present invention, by by the binary system byte data slot in MP4 files, and one by one by data slot with it is pre- If contrast byte compares, whether damaged, obtained without decapsulation and decoding process to identify with comparative result identification MP4 files The technique effect whether MP4 files damage, effectively improves detection efficiency.
In the present invention, position when detecting file corruption is accounted for into the percentage of whole file as file corruption position Percentage, can obtain the video time of file corruption position by the percentage.
In the present invention, the video time from file corruption position proceeds by the detection of MP4 file decodings, again to MP4 File is detected, and increases detection accuracy, simultaneously because decoding detection since file corruption position, reduces decoding detection It is overall time-consuming.
Brief description of the drawings
Below by a manner of clearly understandable, preferred embodiment is described with reference to the drawings, to above-mentioned characteristic, technical characteristic, Advantage and its implementation are further described.
Fig. 1 is the flow chart of MP4 file corruptions detection method of the present invention；
Fig. 2 is a specific implementation illustration of MP4 file corruptions detection method of the present invention；
Fig. 3 is another specific implementation illustration of MP4 file corruptions detection method of the present invention；
Fig. 4 is the block diagram of MP4 file corruptions detection device of the present invention；
Fig. 5 is a specific implementation illustration of MP4 file corruptions detection device of the present invention；
Fig. 6 is another specific implementation illustration of MP4 file corruptions detection device of the present invention.
Drawing reference numeral explanation：
100- byte read modules, 200- bytes segmentation module, 300- byte comparison modules, 301- comparing units, 302- Computing unit, 303- storage units, 400- duration read modules, 500- decoding process modules, 501- damage time points calculate single Member, 502- decoding units.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below The embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for For those of ordinary skill in the art, without creative efforts, other can also be obtained according to these attached drawings Attached drawing, and obtain other embodiments.
It is a kind of MP4 file corruptions detection method provided by the invention as shown in Figure 1, the content of MP4 files is typically all It is made of binary system byte, wherein the binary system byte data of the MP4 files damaged have the presence of large area identical bytes, so We do quick detection as examination criteria to whether MP4 files damage.Before detection, we can set default contrast word Section, the byte have certain length dL；And some binary system byte.When starting detection, we read all the two of MP4 files System byte data, wherein binary system byte data length are sL.With the two of the length dL interception MP4 files of default contrast byte System byte data, can obtain dL/sL binary system byte data slot.After fragment obtains, one by one by fragment and default pair It is compared than byte, if whole bytes are identical, then it represents that there are large area identical bytes in MP4 files, so as to represent MP4 There is damage in file.
MP4 file corruptions are usually that binary system byte data zero byte of large area occur, so default contrast byte content It is zero, when it is the situation of zero byte entirely to detect binary system byte data slot, illustrates that MP4 files have damage.
Default contrast byte length cannot be too short, because MP4 files are not when damaging；Binary system byte data therein can There can be a small amount of consecutive identical byte；Such as：Zero byte, if default contrast byte is too short, can exist to MP4 file corruptions Erroneous judgement, we are more than or equal to length of 512 byte lengths as default contrast byte using dL.
MP4 files are usually larger, disposably can not all read its binary system byte data, so we are first to MP4 texts Part carries out fragmentation, i.e., sectional reading binary system byte data are compared, the binary word joint number of each section of reading According to cannot be shorter than default contrast byte length, we be used as per segment length, specifically using the multiple of default contrast byte length Can be the length that 1024 bytes are multiplied by more than or equal to 1024.
A kind of MP4 file corruptions detection method of this law offer is provided.It can be seen from the figure that judging After file corruption, the calculating to damaging position and record are added；Detailed process is as follows：
S1：Read the binary system byte data in MP4 files to be measured；
S2：Binary system byte data described in length segmentation S1 with default contrast byte, obtain binary system byte data Fragment；
S301：The binary system byte data slot is subjected to content comparison with default contrast byte one by one；
If identical, stopping is compared, and is represented file corruption, is calculated and record file corruption position percentage.
, can be with if we are split the binary system byte data in MP4 files with default contrast byte length N number of binary system byte data slot is obtained, when judging file corruption, the binary system byte data crossed by contrast can be obtained Fragment number rN, that is, the starting number of the binary system byte data slot damaged.So rN*dL can draw the two of damage System byte data initial length, this length divided by the total binary system byte data length of MP4 files, it is possible to obtain damage position Account for the percentage of total length, i.e. file corruption position percentage；Specific formula is as follows：
Wherein, pt is file corruption position percentage, and dL is contrast byte length, and rN is the binary word joint number contrasted According to fragment number, sL is the binary system byte data overall length of MP4 files.
Such as：MP4 file binary system byte data lengths are 4096 bytes；That is sL=4096, preset contrast byte length It is 512 bytes；That is dL=512.By binary system byte data with can be obtained after default contrast byte length segmentation 8 two into Byte data fragment processed；That is N=8.After starting detection, the 4th binary system byte data slot and default contrast byte phase are found Together；That is MP4 files damage, at this time rN=4, and pt=0.5 can be calculated by above-mentioned formula；That is file corruption position hundred It is 0.5 to divide ratio.
It is illustrated in figure 3 a kind of MP4 file corruptions detection method provided by the invention.
From figure 3, it can be seen that we add the mistake that decoding detection is carried out to MP4 files after the method that Fig. 2 is provided Journey；Detailed process is as follows：
S1：Read the binary system byte data in MP4 files to be measured；
S2：Binary system byte data described in length segmentation S1 with default contrast byte, obtain binary system byte data Fragment；
S301：The binary system byte data slot is subjected to content comparison with default contrast byte one by one；
If identical, stopping is compared, and is represented file corruption, is calculated and record file corruption position percentage；
S4：Read MP4 file video lengths；
S5：Calculation document damages time point；
S6：The MP4 files are decoded since file corruption time point；
S7：Judge whether successfully decoded；
If failure；Then represent MP4 file corruptions；
This process can improve MP4 files damage to judging that MP4 file corruption results verify with Fig. 2 methods The accuracy rate of bad detection.It is time-consuming longer due to integrally being decoded to MP4 files, file corruption position may MP4 files it is overall compared with Position afterwards, damages position percentage, at this time the decoding school before position is damaged since we have been computed simultaneously storage file Test, belong to idle work, so we do not use overall decoding to verify the MP4 files with broken parts, but use Solution code check is proceeded by from damage position, verification efficiency is improved with this.
When solving code check, video length sT is first obtained.MP4 files are decoded since file corruption time point again, And judge whether to be correctly decoded, if cannot be correctly decoded supporting paper has damage really.The wherein file corruption time Point can be calculated by file corruption position percentage and obtained, and specific formula is as follows：
P=pt*sT
Wherein, p is the file corruption time point, and pt is file corruption position percentage, and sT is the MP4 files Video length.
Such as：A length of 60s during the MP4 files of reading；That is sT=60, file corruption position percentage are 0.5；That is pt=0.5, Can be calculated file corruption time point by above-mentioned formula is 30s.At this time to MP4 texts since video length is the position of 30s Part carries out decoding detection, and it is time-consuming can effectively to reduce decoding.
Detection initial time can be adjusted 10s to 20s forward, allowed by us on the basis of above-mentioned file corruption time point Whole detection process is more accurate.
If 4 show a kind of MP4 file corruptions detection device provided by the invention, including byte read module 100；Word Section segmentation module 200 and byte comparison module 300；
Binary system byte data in MP4 files are read out by byte read module 100, byte segmentation module 200 The binary system byte data read are divided into some binary system byte data slots, byte with the length of default contrast byte Comparison module 300 is one by one by binary system byte data slot compared with default contrast byte, when finding identical, feedback There is the information of damage in MP4 files.
A kind of MP4 file corruptions detection device provided by the invention is illustrated in figure 5, wherein, byte comparison module 300 wraps Include comparing unit 301, computing unit 302 and storage unit 303.
Comparing unit 301 by the binary system byte data slot obtained after segmentation one by one with it is default contrast byte compared with, when It was found that when binary system byte data slot is identical with default contrast byte, represent that MP4 files have damage, at this time computing unit 302 Start to calculate MP4 file corruptions position percentage；Using equation below：
Wherein, pt is file corruption position percentage, and dL is contrast byte length, and rN is the binary word joint number contrasted According to fragment number, sL is the binary system byte data overall length of MP4 files.
Such as：It is 4096 bytes that byte read module 100, which reads MP4 file binary system byte data lengths,；That is sL= 4096, it is 512 bytes to preset contrast byte length；That is dL=512.Byte splits module 200 by binary system byte data with pre- If 8 binary system byte data slots can be obtained after contrast byte length segmentation；That is N=8.After starting detection, byte contrast mould Block 300 finds that the 4th binary system byte data slot is identical with default contrast byte；That is MP4 files damage, at this time rN= 4, pt=0.5 can be calculated by above-mentioned formula；I.e. file corruption position percentage is 0.5.
Storage unit 302 is preserved result of calculation pt.
It is illustrated in figure 6 a kind of MP4 file corruptions detection device provided by the invention.When being added on the basis of Fig. 5 Long read module 400 and decoding process module 500；Wherein decoding process module 500 includes damage time point computing unit 501 And decoding unit 502.
Duration read module 400 reads MP4 files when byte comparison module 300 judges that MP4 files damage Video length, then decoding judgement is carried out to MP4 files by decoding process module 500, if it is true to decode explanation MP4 files Real storage is damaging.Time point computing unit 501 is damaged in decoding process module 500 can be preferentially to MP4 file corruptions position Time point is calculated, and formula is as follows：
P=pt*sT
Wherein, p is the file corruption time point, and pt is file corruption position percentage, and sT is the MP4 files Video length.
Such as：A length of 60s during the MP4 files that duration read module 400 is read；That is sT=60, file corruption position percentage For 0.5；That is pt=0.5, can be calculated file corruption time point by above-mentioned formula is 30s.At this time decoding unit 502 just from regarding The position of a length of 30s starts to carry out decoding detection to MP4 files during frequency.It is time-consuming that this process can effectively reduce decoding.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the preferred of the present invention Embodiment, it is noted that for those skilled in the art, do not departing from the premise of the principle of the invention Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (12)

  1. A kind of 1. MP4 file corruptions detection method, it is characterised in that including：
    S1：Read the binary system byte data in MP4 files to be measured；
    S2：Binary system byte data described in length segmentation S1 with default contrast byte, obtain binary system byte data slot；
    S3：The binary system byte data slot is subjected to content comparison with default contrast byte one by one；
    If identical, stopping is compared, and represents file corruption.
  2. 2. MP4 file corruptions detection method as claimed in claim 1, it is characterised in that the content of the default contrast byte It is 0.
  3. 3. MP4 file corruptions detection method as claimed in claim 1 or 2, it is characterised in that MP4 files to be measured are read in S1 In binary system byte data include：
    Binary system byte data in MP4 files to be measured are read with preset byte length.
  4. 4. MP4 file corruptions detection method as claimed in claim 3, it is characterised in that the preset byte length is default Contrast the integral multiple of byte length.
  5. 5. MP4 file corruptions detection method as claimed in claim 1 or 2, it is characterised in that S3 is further included：
    When content is more identical, calculates and record file corruption position percentage.
  6. 6. MP4 file corruptions detection method as claimed in claim 5, it is characterised in that the calculation document damages position hundred Divide as follows than formula：
    <mrow> <mi>p</mi> <mi>t</mi> <mo>=</mo> <mfrac> <mrow> <mi>r</mi> <mi>N</mi> <mo>*</mo> <mi>d</mi> <mi>L</mi> </mrow> <mrow> <mi>s</mi> <mi>L</mi> </mrow> </mfrac> </mrow>
    Wherein, pt is file corruption position percentage, and dL is default contrast byte length, and rN is the binary word joint number contrasted According to fragment number, sL is the binary system byte data overall length of MP4 files.
  7. 7. MP4 file corruption detection methods as claimed in claim 5, it is characterised in that the MP4 file corruptions detection method Further included when S3 judges MP4 file corruptions：
    S4：Read MP4 file video lengths；
    S5：Calculation document damages time point；
    S6：The MP4 files are decoded since file corruption time point；
    S7：Judge whether successfully decoded；
    If failure；Then represent MP4 file corruptions.
  8. 8. MP4 file corruptions detection method as claimed in claim 7, it is characterised in that when calculation document described in S5 is damaged Between the formula put it is as follows：
    P=pt*sT
    Wherein, p is the file corruption time point, and pt is file corruption position percentage, and sT is the MP4 files video Duration.
  9. A kind of 9. MP4 file corruptions detection device, it is characterised in that including：Byte read module, byte segmentation module and word Save comparison module；
    Wherein, the byte read module is used to read the binary system byte data in MP4 files；
    The byte splits module, is connected with the byte read module, and the byte segmentation module is with default contrast byte Length splits the binary system byte data in the MP4 files of reading；
    The byte comparison module, is connected with byte segmentation module, and the byte comparison module is used to that gained will to be split Binary system byte data slot compared with default contrast byte, judges file corruption one by one when identical.
  10. 10. MP4 file corruptions detection device as claimed in claim 9, it is characterised in that the byte comparison module includes： Comparing unit, computing unit and storage unit；
    Wherein, the comparing unit, with the byte segmentation module be connected, the comparing unit be used for will split obtained by two into Byte data fragment processed compared with default contrast byte, judges file corruption one by one when identical；
    The computing unit, is connected with the comparing unit, comparative result of the computing unit based on the comparing unit, when Calculation document damages position percentage when comparative result is identical；
    The storage unit, is connected with the computing unit, and the storage unit is used to store the text that the computing unit calculates Part damages position percentage.
  11. 11. the MP4 file corruption detection devices as described in claim 9 or 10, it is characterised in that further include：Duration reads mould Block and decoding process module；
    Wherein, the duration read module, for reading MP4 file video lengths；
    The decoding process module, is connected, the decoding with the byte comparison module and the duration read module respectively Processing module is used to decode MP4 files.
  12. 12. MP4 file corruptions detection device as claimed in claim 11, it is characterised in that the decoding process module includes： Damage time point computing unit and decoding unit；
    Wherein, the damage time point computing unit, connects with the byte comparison module and the duration read module respectively Connect, the damage time point computing unit is used for the time point of calculation document damage position；
    The decoding unit, is connected, the decoding unit is based on the damage time point with the damage time point computing unit The file corruption position time point that computing unit calculates decodes MP4 files.
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CN101478684A (en) * 2008-12-31 2009-07-08 杭州华三通信技术有限公司 Method and system for detecting integrity of stored video data
CN103886883A (en) * 2014-03-20 2014-06-25 公安部物证鉴定中心 Method and system for recovering lossy video monitoring data
CN104486614A (en) * 2014-12-10 2015-04-01 央视国际网络无锡有限公司 MP4 (Mobile Pentium 4) video format corruption detection method

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Publication number Priority date Publication date Assignee Title
KR20060020466A (en) * 2004-08-31 2006-03-06 엘지전자 주식회사 Operating program automatic restoration method for mobile communication device
CN101425136A (en) * 2008-10-24 2009-05-06 北京工业大学 Method and device for acquiring partial binary mode characteristic of video image
CN101478684A (en) * 2008-12-31 2009-07-08 杭州华三通信技术有限公司 Method and system for detecting integrity of stored video data
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