CN105847724B - A kind of video record power-off protection method and device - Google Patents
A kind of video record power-off protection method and device Download PDFInfo
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- CN105847724B CN105847724B CN201610225402.0A CN201610225402A CN105847724B CN 105847724 B CN105847724 B CN 105847724B CN 201610225402 A CN201610225402 A CN 201610225402A CN 105847724 B CN105847724 B CN 105847724B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Management Or Editing Of Information On Record Carriers (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
The invention discloses a kind of video record power-off protection method and devices, which comprises video record creates mp4 file, and newly created mp4 file is written in file header ftyp；Creation Amoov box and Bmoov box, the Amoov box and Bmoov box all account for a moov box space size；The size of fixed mdat box, writes video data into mdat box；It is alternately written into Amoov box and Bmoov box at regular intervals, thereto a write-in moov type and data, another write-in free type and data；Described device includes: MP4 file creating unit；Index information file creating unit；Media data writing unit；Cycling element.The present invention saves multiple mdat information by the information of alternately preservation moov, so that occurring power-off or card machine suddenly when video record, still can guarantee the integrality of mp4 file, so that video recording energy normal play.The present invention is widely used in video record field as a kind of video record power-off protection method and device.
Description
Technical field
The present invention relates to video record technical field more particularly to a kind of video record power-off protection methods and device.
Background technique
MP4 file is by several box(Box=BoxHeader+BoxData; BoxHeader = BoxSize +
BoxType;) composition.
Video record refers to recording from computer hardware terminal, the video of computer viewing window environment, common recording
Mode includes capturing the hardware videos such as camera, video camera, digital camera, TV card, DVR, records the game of computer viewing window
Video, QQ video, recording film etc..Athletic-type camera be collect high definition dynamic take pictures, extensive angle video recording, stabilization waterproof shatter-resistant in
The camera of the whole body.Outdoor sports, photography, extreme sport are generally liked using crowd, be mainly used for taking photo by plane, racing car,
In every movement such as skiing, bungee jumping, parachute jumping, diving, tourism, recording of growing up, due to using outdoors, when battery capacity is low
Time cannot charge in time, so causing video file to be recorded it is easy to appear unexpected power-off or card machine when video record
Mistake is produced, video file is imperfect, is unable to normal play.Current video record generally uses reserve battery or powers on extensive
Compound formula saves video file to prevent from powering off suddenly or the case where card machine, cannot accomplish power-off and timely when machine
It saves.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide one kind to work as equipment accident power-off, works as machine, card mistake
Etc. situations when guarantee video file integrality, guarantee video recording can normal play video record power-off protection method and device.
The technical scheme adopted by the invention is that: a kind of video record power-off protection method, including MP4 document recording, institute
Stating MP4 file includes: ftyp box, free box, moov box and mdat box comprising:
Step A: video record creates mp4 file, and newly created mp4 file is written in file header ftyp；
Step B: creation Amoov box and Bmoov box, the Amoov box and Bmo box all account for a moov box
Subspace size, box type are respectively moov and free；
Step C: video file is written in mdat box the size of fixed mdat box；
Step D: it is alternately written into the Amoov box and Bmoov box of creation at regular intervals: a write-in thereto
Moov type and data, another write-in free type and data；Step C and step D are carried out simultaneously.
Further, the moov box is for storing media index information.
Further, the mdat box is due to storing media data.
Further, the step C specifically includes sub-step:
C1: the size of fixed mdat box starts simultaneously at write-in view at the BoxSize of size write-in mdat box
Frequency evidence；
C2: when write-in mdat box video data size be more than mdat box BoxSize, then new mdat box is written
Son repeats step C1.
Further, the mdat box size is to estimate certain time video recording according to the size of current video recording code stream
Video data size.
Further, the certain time is 5 minutes.
A kind of video record power-off protection apparatus comprising:
MP4 file creating unit: being used for video record, creates mp4 file, and newly created mp4 is written in file header ftyp
File；
Index information file creating unit: creation Amoov box and Bmoov box, the Amoov box and Bmoov box
Son all accounts for a moov box space size, and box type is respectively moov and free；
Media data writing unit: the size of fixed mdat box writes video data into mdat box；
Cycling element: alternately writing the Amoov box and Bmoov box of creation at regular intervals, thereto a write-in
Moov type and data, another write-in free type and data.
Further comprising:
Second media data writing unit: when the video file size of write-in mdat box is more than mdat box
New mdat box is then written in BoxSize.
The beneficial effects of the present invention are: the present invention saves multiple mdat information by the information of alternately preservation moov, so that
Occur power-off or card machine suddenly when video record, still can guarantee the integrality of mp4 file, so that video recording can normally be broadcast
It puts.
Detailed description of the invention
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
Fig. 1 is the flow chart of the specific embodiment of the invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
A kind of video record power-off protection method, including MP4 document recording, the MP4 file include: ftyp box,
Free box, moov box and mdat box,
As shown in Figure 1, comprising:
Step A: video record creates mp4 file, and newly created mp4 file is written in file header ftyp；
Step B: creation Amoov box and Bmoov box, the Amoov box and Bmoov box all account for a moov
Box space size, box type are respectively moov and free；
Step C: the size of fixed mdat box writes video data into mdat box；
Step D: alternately writing the Amoov box and Bmoov box of creation at regular intervals, thereto a write-in
Moov type and data, another write-in free type and data；Step C and step D are carried out simultaneously.
Ftyp as MP4 format mark and include some information about file.Stop video recording if normal, then ensures
One is moov in Amoov and Bmoov, another is renamed as free, first modifies the BoxData of Amoov, then modifies
The BoxType of Amoov is moov, and the BoxType for finally modifying Bmoov is free, or first modifies the BoxData of Bmoov, then
The BoxType for modifying Bmoov is moov, and the BoxType for finally modifying Amoov is free.Mdat box is rewritten simultaneously
BoxSize, to will not be had an impact to normal video file；If centainly having one correctly because accidental cause powers off
Moov box guarantees that video recording can normal play to can guarantee the integrality of video file.
It is further used as preferred embodiment, the moov box is for storing media index information.
It is further used as preferred embodiment, the mdat box is due to storing media data.
It is further used as preferred embodiment, the step C specifically includes sub-step:
C1: the size of fixed mdat box starts simultaneously at write-in view at the BoxSize of size write-in mdat box
Frequency evidence；
C2: when write-in mdat box video file size be more than mdat box BoxSize, then new mdat box is written
Son repeats step C1.
Multiple mdat boxes may be likely to occur in a MP4 file simultaneously, if centainly having because accidental cause powers off
One correct mdat box guarantees that video recording can normal play to can guarantee the integrality of video file.
Be further used as preferred embodiment, the mdat box size be according to the size for frame per second of currently recording a video come
Estimate the video file size of certain time video recording.
It is further used as preferred embodiment, the certain time is 5 minutes.This time can be according to user preferences tune
Section can control the size of mdat box by adjusting this time, and mdat box is smaller, and it is fewer that power-off protection loses the video gone.
If normal stop video recording, then ensure it is newest in Amoov and Bmoov be renamed as moov, another is renamed as
Free, while the BoxSize of mdat box is rewritten, to will not be had an impact to normal video file；If because accidental cause is disconnected
Electricity then centainly has a correct moov box, to can guarantee the integrality of video file, guarantees that video recording can normally be broadcast
It puts.
A kind of video record power-off protection apparatus comprising:
MP4 file creating unit: being used for video record, creates mp4 file, and newly created mp4 is written in file header ftyp
File；
Index information file creating unit: creation Amoov box and Bmoov box, the Amoov box and Bmoov box
Son all accounts for a moov box space size；
Media data writing unit: the size of fixed mdat box writes video data into mdat box；
Cycling element: alternately writing the Amoov box and Bmoov box of creation at regular intervals, thereto a write-in
Moov type file, another write-in free type file.
It is further used as preferred embodiment comprising:
Second media data writing unit: when the video data size of write-in mdat box is more than mdat box
New mdat box is then written in BoxSize.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (5)
1. a kind of video record power-off protection method, including MP4 document recording, the MP4 file includes: ftyp box, free
Box, moov box and mdat box, characterized in that it comprises:
Step A: video record creates mp4 file, and newly created mp4 file is written in file header ftyp；
Step B: it is empty that creation Amoov box and Bmoov box, the Amoov box and Bmoov box all account for a moov box
Between size；
Step C: video file is written in mdat box the size of fixed mdat box；
Step D: it is alternately written into Amoov box and Bmoov box at regular intervals: a write-in moov type and number thereto
According to another write-in free type and data；
Step C and step D are run parallel；
The step C specifically includes sub-step:
C1: the size of fixed mdat box starts simultaneously at write-in video counts at the BoxSize of size write-in mdat box
According to；
C2: when write-in mdat box video file size be more than mdat box BoxSize, then new mdat box is written,
Repeat step C1.
2. video record power-off protection method according to claim 1, it is characterised in that:
The mdat box size is to estimate that the certain time video file of video recording is big according to the size of current video recording frame per second
It is small.
3. video record power-off protection method according to claim 2, it is characterised in that:
The certain time is 5 minutes.
4. a kind of video record power-off protection apparatus, characterized in that it comprises:
MP4 file creating unit: being used for video record, creates mp4 file, and newly created mp4 file is written in file header ftyp；
Index information file creating unit: creation Amoov box and Bmoov box, the Amoov box and Bmoov box are all
A moov box space size is accounted for, box type is respectively moov and free；
Media data writing unit: the size of fixed mdat box writes video data into mdat box；
Cycling element: the Amoov box and Bmoov box of creation are alternately write at regular intervals, thereto a write-in moov
Type and data, another write-in free type and data.
5. video record power-off protection apparatus according to claim 4, characterized in that it comprises:
Second media data writing unit: when write-in mdat box video data size be more than mdat box BoxSize, then
New mdat box is written.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610225402.0A CN105847724B (en) | 2016-04-12 | 2016-04-12 | A kind of video record power-off protection method and device |
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| CN201610225402.0A CN105847724B (en) | 2016-04-12 | 2016-04-12 | A kind of video record power-off protection method and device |
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| CN105847724A CN105847724A (en) | 2016-08-10 |
| CN105847724B true CN105847724B (en) | 2018-12-07 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106935252A (en) * | 2017-02-08 | 2017-07-07 | 苏州科达科技股份有限公司 | A kind of MP4 document generating methods and device |
| CN109936715B (en) * | 2017-12-19 | 2021-09-03 | 华为技术有限公司 | MP4 file processing method and related equipment thereof |
| CN109167951A (en) * | 2018-09-13 | 2019-01-08 | 深圳市信丰伟业科技有限公司 | Powered-off fault based on Android framework automobile data recorder can play video method |
| CN111385508B (en) * | 2018-12-28 | 2021-08-20 | 广州市百果园信息技术有限公司 | Video processing method, device, equipment and storage medium |
| CN110798730A (en) * | 2019-11-14 | 2020-02-14 | 深圳市浪涛科技有限公司 | MP4 file recording and repairing method |
| CN110798712A (en) * | 2019-11-28 | 2020-02-14 | 苏州长风航空电子有限公司 | Lightweight compression video packaging method |
| CN111063380A (en) * | 2020-01-02 | 2020-04-24 | 南京美乐威电子科技有限公司 | MP4 file generation method, processing device, equipment and storage medium |
| CN111885331A (en) * | 2020-07-25 | 2020-11-03 | 徐州云创电子科技有限公司 | Novel mp4 packaging method for automatic storage of video interruption |
| CN111835993A (en) * | 2020-09-16 | 2020-10-27 | 深圳市阿达视高新技术有限公司 | Damage-proof video storage method, device, equipment and medium |
| CN112732180B (en) * | 2020-12-29 | 2023-04-14 | 哈尔滨海能达科技有限公司 | Information processing method, processing device, electronic equipment and storage medium |
| CN114374875B (en) * | 2021-12-31 | 2024-05-28 | 浙江大华技术股份有限公司 | MP4 file recording method, device and readable storage medium |
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