CN110798730A - MP4 file recording and repairing method - Google Patents
MP4 file recording and repairing method Download PDFInfo
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- CN110798730A CN110798730A CN201911110575.8A CN201911110575A CN110798730A CN 110798730 A CN110798730 A CN 110798730A CN 201911110575 A CN201911110575 A CN 201911110575A CN 110798730 A CN110798730 A CN 110798730A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/85406—Content authoring involving a specific file format, e.g. MP4 format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
- H04N21/4325—Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4334—Recording operations
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Databases & Information Systems (AREA)
- Management Or Editing Of Information On Record Carriers (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
The invention relates to a method for recording and repairing an MP4 file, which specifically comprises the following steps: the audio and video data generating device comprises an audio and video generating area and a data indexing area, wherein the audio and video generating area is used for storing audio and video data, the data indexing area is used for storing audio and video metadata information, the audio and video area can store the audio and video data in real time, and the data indexing area can store the audio and video metadata information at regular time. According to the MP4 file recording and repairing method provided by the invention, when the MP4 file is damaged due to unexpected interruption in the recording process, the damaged MP4 file can be quickly and automatically repaired, and the loss caused by the damage of the MP4 file is avoided.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a method for recording and repairing an MP4 file.
Background
In the prior art, for intelligent education or education informatization, video recording and video on demand and playback in the teaching process are commonly used and also important applications, but when MP4 files are recorded in classroom teaching, abnormal interruption of the recording process due to power failure, equipment failure and the like can be possibly caused, so that the MP4 file is damaged, and the MP4 file information is incompletely stored and cannot be used, namely, the video recording process is abnormally stopped, so that the video recording video files cannot be normally played and used.
Disclosure of Invention
The invention provides a method for recording and repairing an MP4 file, which solves the problems that an MP4 file is damaged when interruption occurs in the process of recording an MP4 file, and the recording needs to be carried out again when the situation is serious.
In order to achieve the purpose, the invention provides the following technical scheme:
an MP4 file recording method is applied to recording audio and video, and the method specifically comprises the following steps:
s1, generating an audio and video area for storing audio and video data and generating a data index area for storing audio and video metadata information;
s2, recording audio and video data according to an MP4 file packaging format, storing the audio and video data in the audio and video area in real time, and storing the audio and video metadata information in the data index area at regular time;
and S3, when the recording is normally finished, writing the audio and video metadata information in the data index area into the audio and video area, deleting the data index area, and renaming the audio and video area as a recording area.
Preferably, after the step S2, before the step S3, the method further includes a step S21 of generating a second data index area, updating the audio/video metadata information to the second data index area in real time, and renaming the second data index area as a data index area after the updating is completed.
Preferably, S22 is further included after the step S21, the data index is divided into a first part and a second part, the first part is the first 8 bytes and stores effective audio/video data length information, and the second part is the last byte and stores the audio/video metadata information.
Preferably, S31 is further included after the step S3, and when the recording process of the MP4 file abnormally ends, the audio video area and the data index area are simultaneously reserved.
An MP4 file repairing method specifically comprises the following steps:
s1, searching the damaged audio and video area, searching the data index area corresponding to the damaged audio and video area, reading the effective audio and video data length information in the first 8 bytes from the first part of the data index area, wherein the second part of the data index area is effective audio and video metadata information;
s2, searching the audio and video area, positioning the effective position of audio and video data in the audio and video area according to the length information of the effective audio and video data, and discarding the audio and video data at the position;
s3, writing the audio and video metadata information in the data index area into the audio and video area;
and S4, renaming the audio and video area as a recording area, deleting the data index area, and completing audio and video repair.
Through implementing above technical scheme, have following technological effect: according to the MP4 file recording and repairing method, when the MP4 file is damaged due to unexpected interruption in the recording process, the damaged MP4 file can be automatically repaired, and loss caused by damage of the MP4 file is avoided.
Drawings
Fig. 1 is a flow chart of MP4 file recording provided by the present invention;
fig. 2 is a flowchart of MP4 file repair provided by the present invention.
Detailed Description
In order to better understand the technical scheme of the invention, the following detailed description is made on the embodiments provided by the invention in combination with the accompanying drawings.
Example 1: an MP4 file recording method is applied to recording audio and video, and the method specifically comprises the following steps:
s1, generating an audio and video area for storing audio and video data and generating a data index area for storing audio and video metadata information;
s2, recording audio and video data according to an MP4 file packaging format, storing the audio and video data in the audio and video area in real time, and storing the audio and video metadata information in the data index area at regular time;
and S3, when the recording is normally finished, writing the audio and video metadata information in the data index area into the audio and video area, deleting the data index area, and renaming the audio and video area as a recording area.
In this embodiment, the recording of the MP4 file is applied to the recording of teaching videos, when an audio/video is recorded, an audio/video area and a data index area are generated first, the audio/video area is a folder or an audio/video storage area for storing audio/video data, the audio/video data is recorded teaching videos or other MP4 video data, the data index area is a folder or an audio/video metadata information storage area for storing audio/video metadata information, the audio/video metadata information is index information of the audio/video data, the audio/video area can store the recorded audio/video data, such as teaching videos or other MP4 videos, in real time, and does not interrupt the audio/video data, the audio/video metadata information is stored in the data index area at regular time, and a plurality of interrupts occur in the middle, such as every 10s, The method is mainly characterized in that certain time is needed for generating the audio and video metadata information, certain resources are consumed, the storage of audio and video data is affected too frequently, when a recording process is not accidental, after the recording process is normally finished, the audio and video metadata information in the data index area is written into the audio and video area, the data index area is deleted, the audio and video area is renamed to be the recording area, the whole recording process is finished, when the MP4 file recording process is abnormally finished, the audio and video area and the data index area are simultaneously reserved, and the audio and video data in the audio and video area are repaired by utilizing the audio and video data information in the data index area.
Example 2: an MP4 file recording method is applied to recording audio and video, and the method specifically comprises the following steps:
s1, generating an audio and video area for storing audio and video data and generating a data index area for storing audio and video metadata information;
s2, recording audio and video data according to an MP4 file packaging format, storing the audio and video data in the audio and video area in real time, and storing the audio and video metadata information in the data index area at regular time;
and S3, when the recording is normally finished, writing the audio and video metadata information in the data index area into the audio and video area, deleting the data index area, and renaming the audio and video area as a recording area.
After the step S2, before the step S3, the method further includes a step S21 of generating a second data index area, updating the audio/video metadata information to the second data index area in real time, and renaming the second data index area as a data index area after the updating is completed.
In this embodiment, in order to prevent that the recording process is unexpected in the interval time of updating the audio/video metadata information, the audio/video data stored in the audio/video area is damaged, and meanwhile, the audio/video metadata information stored in the data index area is also damaged, so that the audio/video data cannot be recovered, and therefore, the audio/video metadata information is updated into a temporary second data index area first, and is renamed into the data index area after the audio/video metadata information is updated successfully, so that the original data index area is covered, and the phenomenon that the audio/video data are damaged and cannot be recovered in the audio/video area is avoided.
Example 3: an MP4 file recording method is applied to recording audio and video, and the method specifically comprises the following steps:
s1, generating an audio and video area for storing audio and video data and generating a data index area for storing audio and video metadata information;
s2, recording audio and video data according to an MP4 file packaging format, storing the audio and video data in the audio and video area in real time, and storing the audio and video metadata information in the data index area at regular time;
and S3, when the recording is normally finished, writing the audio and video metadata information in the data index area into the audio and video area, deleting the data index area, and renaming the audio and video area as a recording area.
After the step S2, before the step S3, the method further includes a step S21 of generating a second data index area, updating the audio/video metadata information to the second data index area in real time, and renaming the second data index area to a data index area after the updating is completed, and after the step S21, the method further includes a step S22 of dividing the data index area into a first part and a second part, where the first part is the first 8 bytes and stores the valid audio/video data length information, and the second part is the following bytes and stores the audio/video metadata information.
In this embodiment, the data index area is divided into two parts, the first part is the first 8 bytes for storing effective audio and video data length information, so as to be convenient for rapidly positioning the length of effective audio and video data in the MP4 file repair, the second part is the later bytes for storing audio and video metadata information, and when the audio and video data stored in the audio and video area is damaged, the audio and video data in the audio and video area can be recovered through the audio and video metadata information in the data index area.
On the basis of the foregoing embodiments, in other embodiments, further, after the step S3, S31 is included, and when the MP4 file recording process abnormally ends, the audio video area and the data index area are reserved.
In this embodiment, when recording is finished due to an accident occurring during the recording process of the MP4 file, such as a power failure or a machine failure, the audio and video area and the data index area are simultaneously reserved, so that the recorded MP4 file can be recovered when damaged, thereby reducing loss and secondary recording, and saving cost.
The embodiment of the invention also provides an MP4 file repairing method, which is applied to repairing any MP4 file in the above embodiments, and the method specifically comprises the following steps:
s1, searching the damaged audio and video area, searching the data index area corresponding to the damaged audio and video area, reading the effective audio and video data length information in the first 8 bytes from the first part of the data index area, wherein the second part of the data index area is effective audio and video metadata information;
s2, searching the audio and video area, positioning the effective position of audio and video data in the audio and video area according to the length information of the effective audio and video data, and discarding the audio and video data at the position;
s3, writing the audio and video metadata information in the data index area into the audio and video area;
and S4, renaming the audio and video area as a recording area, deleting the data index area, and completing audio and video repair.
In this embodiment, when the recording process is abnormally finished, the system is in a normal operation state after the abnormal recovery, if the system is idle, that is, in a non-recording state, the audio-video area is searched in the magnetic disk, if an area of this type exists, which represents that the video recording is abnormally stopped, audio-video data needs to be repaired, at this time, two areas of the audio-video area and the data index area are retained in the system, the data index area corresponding to the damaged audio-video area is searched, the effective audio-video data length information in the first 8 bytes is read from the first part of the data index area, the second part of the data index area is effective audio-video metadata information, then the audio-video area is opened, and the complete position of the audio-video data in the audio-video area can be quickly located according to the effective audio-video data length information of the first part of the data index area, and deleting the audio and video data after the position, writing effective audio and video metadata information in the second part of the data index area into the position where the audio and video data are complete in the audio and video area, completing the repair of the audio and video data in the audio and video area, finally renaming the audio and video area as a recording area, deleting the data index area, and completing the repair of the audio and video data.
While the MP4 file recording and repairing method provided by the embodiment of the present invention has been described in detail, for those skilled in the art, the idea of the embodiment of the present invention may be changed in the specific implementation and application scope, and in summary, the present disclosure should not be construed as limiting the present invention.
Claims (5)
1. An MP4 file recording method is applied to recording audio and video, and the method specifically comprises the following steps:
s1, generating an audio and video area for storing audio and video data and generating a data index area for storing audio and video metadata information;
s2, recording audio and video data according to an MP4 file packaging format, storing the audio and video data in the audio and video area in real time, and storing the audio and video metadata information in the data index area at regular time;
and S3, when the recording is normally finished, writing the audio and video metadata information in the data index area into the audio and video area, deleting the data index area, and renaming the audio and video area as a recording area.
2. The MP4 file recording method according to claim 1, further comprising, after the step S2 and before the step S3, a step S21 of generating a second data index area, updating the av metadata information to the second data index area in real time, and renaming the second data index area as a data index area after the updating is completed.
3. The MP4 file recording method according to claim 1, further comprising, after the step S21, S22, dividing the data index into a first part and a second part, wherein the first part is the first 8 bytes and stores valid audio/video data length information, and the second part is the last bytes and stores the audio/video metadata information.
4. The MP4 file recording method as claimed in claim 1, further comprising step S31 after the step S3, wherein the audio video area and the data index area are reserved when the recording process of the MP4 file is abnormally terminated.
5. An MP4 file repairing method, applied to the repairing of the MP4 file as claimed in any one of claims 1-4, the method specifically includes the following steps:
s1, searching the damaged audio and video area, searching the data index area corresponding to the damaged audio and video area, reading the effective audio and video data length information in the first 8 bytes from the first part of the data index area, wherein the second part of the data index area is effective audio and video metadata information;
s2, searching the audio and video area, positioning the effective position of audio and video data in the audio and video area according to the length information of the effective audio and video data, and discarding the audio and video data at the position;
s3, writing the audio and video metadata information in the data index area into the audio and video area;
and S4, renaming the audio and video area as a recording area, deleting the data index area, and completing audio and video repair.
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| CN201911110575.8A CN110798730A (en) | 2019-11-14 | 2019-11-14 | MP4 file recording and repairing method |
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| CN201911110575.8A CN110798730A (en) | 2019-11-14 | 2019-11-14 | MP4 file recording and repairing method |
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| CN114173075A (en) * | 2021-10-22 | 2022-03-11 | 广州市奥威亚电子科技有限公司 | Mp4 file saving method and device for recording, electronic equipment and storage medium |
| CN116860509A (en) * | 2023-09-04 | 2023-10-10 | 深圳麦风科技有限公司 | PST file repairing method, device and storage medium |
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Application publication date: 20200214 |