CN103179435B - A kind of multi-path video data multiplexing method and device - Google Patents

Abstract

The invention discloses a multi-channel video data multiplexing method and device. The method includes: receiving multiple video data in real time; creating a file, limiting the maximum storage capacity of the file, and setting the file as the current file; Determine whether the multi-channel video data received within the fixed time is empty at a fixed time interval; if not, multiplex and encapsulate the multi-channel video data received within the fixed time to generate a multiplexed data block; determine the remaining storage capacity of the current file Whether it is greater than or equal to the storage capacity of the multiplexed data block; if yes, write the data in the multiplexed data block to the current file; if not, create a new file, limit the maximum storage capacity of the new file, and reset The new file is the current file, and the data in the multiplexed data block is written into the current file. The technical solution proposed by the invention can effectively realize the synchronization of multi-channel video data, and simplify the processing logic when the player plays the multi-channel video data.

Description

A method and device for multiplexing multiplexed video data

technical field

The present invention relates to the technical field of video processing, in particular to a method and device for multiplexing multiplexed video data.

Background technique

At present, video surveillance is widely used in the field of security as an important technical means to assist public security departments in combating crimes and maintaining social stability. Video surveillance can provide real-time surveillance, record and store the monitored images, and play them back afterwards. As an application of video surveillance, the interrogation system often requires multiple cameras for all-round real-time monitoring and recording. The synchronization of video data of multiple cameras is an important indicator in the interrogation system.

In the prior art, the interrogation system usually burns the video data collected by multiple cameras into the root CD synchronously. Wherein, a plurality of video files are stored in the root CD, and each file corresponds to video data collected by a camera, that is, one channel of video data. When it is required to play multiple channels of video data in the root disc synchronously, the player needs to read multiple video files at the same time for playback. It can be seen that the existing technical solutions have relatively high requirements on the player, and the player is responsible for the synchronization task of multi-channel video data. When fast forwarding and rewinding, multiple video files need to be processed. to strict synchronization. In particular, when multiple cameras have different bit rates, the processing logic of the player will be more complicated, and at the same time, the playback efficiency of the player will also be affected.

Contents of the invention

The purpose of the present invention is to propose a multi-channel video data multiplexing method and device, which can effectively realize the synchronization of video data collected by multiple cameras, simplify the processing logic of the player, improve the efficiency of the player, and simultaneously Carry some user-defined descriptive information to explain the video data collected by multiple cameras.

For reaching this purpose, the present invention adopts following technical scheme:

A method for multiplexing multiplexed video data, the method comprising:

S1: Receive multiple channels of video data in real time;

S2: Create a file, limit the maximum storage capacity of the file, and set the file as the current file;

S3: after a fixed time, judge whether the multi-channel video data received within the fixed time is empty;

S4: When the multi-channel video data received within the fixed time is not empty, multiplex and encapsulate the multiple video data received within the fixed time to generate a multiplexed data block; wherein the multiplexed data The block includes a multiplexed data block identifier, the play time of each channel of video data in the multiplexed data block, and each channel of video data received within the fixed time that is sequentially stored;

S5: Determine whether the remaining storage capacity of the current file is greater than or equal to the storage capacity of the multiplexed data block; if yes, perform step S6, otherwise, perform step S7;

S6: Write the data in the multiplexed data block to the current file, and return to the step S3;

S7: Create a new file in addition, limit the maximum storage capacity of the new file at the same time, and set the new file as the current file, and write the data in the multiplexed data block to the current file , return to the step S3.

Further, the method also includes:

Generate file description information corresponding to the current file according to user input parameters;

Writing the generated file specification information into the current file.

Further, the file description information includes file name, area identifier, and each product identifier.

Further, the fixed time is preferably 100ms.

Further, the multiplexed data block also includes the length of the multiplexed data block and key data;

Wherein, the key data is decrypted data when encrypted video data exists in the multiplexed data block.

Correspondingly, the present invention also provides a multiplex video data multiplexing device, the device comprising:

The video data receiving module is used to receive multi-channel video data in real time;

A file creation module, configured to create a file, limit the maximum storage capacity of the file, and set the file as the current file;

The video data judging module is used to judge whether the multi-channel video data received within the fixed time is empty after every fixed time;

A multiplexing encapsulation module, used to multiplex and encapsulate the multiplexed video data received within the fixed time period when the multiplexed video data received within the fixed time period is not empty, to generate a multiplexed data block;

A file storage capacity judging module, configured to judge whether the remaining storage capacity of the current file is greater than or equal to the storage capacity of the multiplexed data block;

The first multiplexed data writing module is used to write the data in the multiplexed data block into the current file when the remaining storage capacity of the current file is greater than or equal to the storage capacity of the multiplexed data block ;

The second multiplexing data writing module is used to notify the file creation module to create a new file and limit the new file when the remaining storage capacity of the current file is less than the storage capacity of the multiplexing data block. The maximum storage capacity of the file, setting the new file as the current file; writing the data in the multiplexed data block to the current file.

Further, the device also includes a file description information writing module for

Generate file description information corresponding to the current file according to user input parameters;

Writing the generated file specification information into the current file.

Further, the file description information includes file name, area identifier, and each product identifier.

Further, the fixed time is preferably 100ms.

Further, the multiplexed data block also includes the length of the multiplexed data block and key data;

Wherein, the key data is decrypted data when encrypted video data exists in the multiplexed data block.

The beneficial technical effect of the present invention is:

A method and device for multiplexing multiplexed video data proposed by the present invention multiplexes and encapsulates multiplexed video data received in real time into a multiplexed data block at regular intervals and writes it into the same file, and for each multiplexed Sequential storage of each channel of video data in the data block does not cause mutual influence between multiple channels of video data, and can effectively realize the synchronous playback of subsequent multiple channels of video data, so that the processing logic of the player when playing multiple channels of video data Simplification improves the efficiency of the player and does not require cumbersome processing of multiple video files. At the same time, it can also carry some user-defined file description information to meet user needs.

Description of drawings

FIG. 1 is a schematic flowchart of a method for multiplexing multiplexed video data provided by Embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of a device for multiplexing multiple channels of video data according to Embodiment 2 of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

Embodiment one

FIG. 1 is a schematic flowchart of a method for multiplexing multiple channels of video data provided by Embodiment 1 of the present invention. Referring to Fig. 1, a method for multiplexing multiplexed video data includes:

S101: Receive video data collected by multiple cameras in real time, that is, multiple channels of video data.

In step S101, it is possible to first register with multiple cameras, and after successful registration and verification by multiple cameras, multiple channels of video data are received from multiple cameras in real time. Usually, multiple channels of video data come from the same area. For example, multiple channels of video data come from the surveillance video of the interrogation system of a public security bureau in Haidian District, Beijing.

S102: Create a file, limit the maximum storage capacity of the file, and set the file as the current file; wherein, the maximum storage capacity is used to describe the maximum size of content data that the file can store, for example, 25M.

S103: After a fixed time elapses, determine whether the multi-channel video data received within the fixed time is empty, if yes, perform step S104, otherwise, perform step S105. Preferably, the fixed time is 100ms.

S104: Multiple channels of video data have been received, and the following steps are not continued, and the process ends.

S105: Multiplexing and encapsulating the multiple channels of video data received within the fixed time to generate a multiplexed data block Data Block. The multiplexed data block Data Block includes the multiplexed data block identifier, the play time of each channel of video data in the multiplexed data block, and the sequentially stored video data of each channel received within the fixed time.

Taking 15 channels of video data as an example, when multiplexing and encapsulating the 15 channels of video data received within the fixed time, the encapsulation format (the format of the multiplexed data block Data Block) is preferably:

Among them, M in M/O represents a mandatory item, and O represents an optional item; a mandatory item means that this data cannot be empty, and an optional item means that this data can be empty or not;

Time is used to represent the play time of each road video data of this multiplexing data block Data Block, and is identical with the fixed time in step S103; encapsulation;

Ind is used to indicate whether the i-th video data is not empty; when the i-th video data is not empty, the Ind of the i-th video data is 1, the i-th video data length Length_data, and the i-th video data Data exist , is not empty, otherwise when the i-th road video data is empty, the Ind of the i-th road video data is 0, the i-th road video data length Length_data, the i-th road video data Data do not exist, and are empty;

Ind_ecm is used to indicate whether there is key data, and the key data is the decrypted data when there is encrypted video data in the multiplexing data block Data Block; when there is encrypted video data in the multiplexing data block Data Block, Ind_ecm is 1, the key data length Length_ecm and key data Data_ecm exist and are not empty; when there is no encrypted video data in the multiplexed data block Data Block, when Ind_ecm is 0, the key data length Length_ecm, key data Data_ecm does not exist and is empty;

The CRC check is to ensure the integrity of the data in the multiplexed data block.

S106: Determine whether the remaining storage capacity of the current file is greater than or equal to the storage capacity of the multiplexed data block Data Block after multiplexing and encapsulation in step S105, if yes, perform step S107, otherwise, perform step S108. Wherein, the remaining storage capacity of the current file is the difference between the maximum storage capacity of the current file and the storage capacity of data stored in the current file.

S107: Write the data in the multiplexed data block Data Block multiplexed and encapsulated in step S105 into the set current file, and return to step S103.

S108: Create a new file in addition, and limit the maximum storage capacity of the new file at the same time, and set the new file as the current file, and reuse the data in the multiplexed data block Data Block after step S105 is encapsulated Data is written into the set current file, and the process returns to step S103.

In a preferred implementation of this embodiment, the method for multiplexing multiplexed video data also includes:

According to the user input parameters, generate the file description information Readme corresponding to the current file; wherein, the file description information includes information such as file name, regional identifier ID, and each product identifier ID; the regional identifier ID and each product identifier ID are Key identifier required for decryption when encrypted video data is stored in the file. Each channel of video data in the multiplexing data block stored in the file corresponds to a product. Products corresponding to different channels of video data may be the same or different. When the subsequent player reads and plays the file, if a certain channel of video data in the multiplexed data block stored in the file is encrypted video data, it can be found by reading the area identifier ID and each product identifier ID. The product identifier (key identifier) corresponding to the video data is used to decrypt the video data.

Write the generated file description information to the current file; the writing format of the file description information Readme can be but not limited to:

In addition, the current file may also include information such as the length of the file description information, the start identifier, and the end identifier. For example, the current file format is:

After writing all the received multi-channel video data into the created file, store the created file to an external storage device, such as a DVD disc. When the player plays a DVD disc, it can directly play multiple channels of video data at the same time after demultiplexing according to the multiplexing encapsulation format, without considering the problem of time synchronization, because the multiple channels of video data in each multiplexed data block are inherently Synchronize the recorded content, saving the synchronization logic of the player.

The method provided by Embodiment 1 of the present invention multiplexes and encapsulates multiple channels of video data received in real time into a multiplexed data block at regular intervals and writes them into the same file, and for each channel in each multiplexed data block The video data is stored sequentially, and there will be no mutual influence between multiple video data, which effectively solves the time synchronization problem when playing multiple video data, improves the efficiency of reading and writing multiple video data, and avoids multiple video Files are processed, the work task is heavy defect. At the same time, the multi-channel video data multiplexing method proposed in this embodiment can also carry the user's description information on the file name, area identifier ID, and product identifier ID, which can meet user needs.

Embodiment two

Fig. 2 is a schematic diagram of a multi-channel surveillance video content multiplexing device provided by Embodiment 2 of the present invention. Referring to Fig. 2, a kind of multi-channel surveillance video content multiplexing device comprises:

The video data receiving module 201 is used for receiving video data collected by multiple cameras in real time, that is, multi-channel video data. Usually, multiple channels of video data come from the same area. For example, multiple channels of video data come from the surveillance video of the interrogation system of a public security bureau in Haidian District, Beijing.

The file creation module 202 is used to create a file, limit the maximum storage capacity of the file, and set the file as the current file; wherein, the maximum storage capacity is used to describe the maximum size of content data that can be stored in the file, for example 25M.

The video data judging module 203 is configured to judge whether the multi-channel video data received within the fixed time is empty after every fixed time; preferably, the fixed time is 100 ms.

The multiplexing encapsulation module 204 is used for multiplexing and encapsulating the multiplexed video data received within the fixed time when the video data judging module 203 judges that the multiplexed video data received within the fixed time is not empty, to generate a Multiplexing data blocks;

The multiplexed data block includes an identifier of the multiplexed data block, the playing time of each channel of video data in the multiplexed data block, and each channel of video data received within the fixed time and stored sequentially. The playing time of each channel of video data in the multiplexed data block is consistent with the fixed time. Preferably, the multiplexed data block further includes the length of the multiplexed data block and key data. The key data is decrypted data when there is encrypted video data in the multiplexed data block;

The encapsulation format (the format of the multiplexed data block Data Block) when multiplexing and encapsulating the multiple channels of video data received within the fixed time is the same as that in Embodiment 1, and will not be repeated here.

The file storage capacity judging module 205 is used to judge whether the remaining storage capacity of the current file set by the file creation module 202 is greater than or equal to the storage capacity of the multiplexed data block just generated by the multiplexing encapsulation module 204; wherein, the remaining storage capacity of the current file It is the difference between the maximum storage capacity of the current file and the storage capacity of the stored data in the current file.

The first multiplexed data writing module 206 is used for judging by the file storage capacity judging module 205 that the remaining storage capacity of the current file set by the file creation module 202 is greater than or equal to the storage capacity of the multiplexed data block just generated by the multiplexing encapsulation module 204 , write the data in the multiplexed data block just generated by the multiplexed encapsulation module 204 into the current file set by the file creation module 202 .

The second multiplexing data writing module 207 is used for when the file storage capacity judging module 205 judges that the remaining storage capacity of the current file set by the file creation module 202 is less than the storage capacity of the multiplexing data block just generated by the multiplexing encapsulation module 204 ,

Notify the file creation module 202 to create a new file in addition, limit the maximum storage capacity of the new file, set the new file as the current file;

Write the data in the multiplexed data block just generated by the multiplexed encapsulation module 204 to the current file set by the file creation module 202 .

In a preferred implementation of this embodiment, the device also includes a file description information writing module for:

According to the user input parameters, generate the file description information corresponding to the current file set by the file creation module 202; wherein, the file description information includes information such as file name, area identifier ID, each product identifier ID; area identifier ID, Each product identifier ID is the key identification required when encrypted video data is stored in the file; the area identifier ID and each product identifier ID are the key identification required for decryption when encrypted video data is stored in the file. Each channel of video data in the multiplexing data block stored in the file corresponds to a product. Products corresponding to different channels of video data may be the same or different. When the subsequent player reads and plays the file, if a certain channel of video data in the multiplexed data block stored in the file is encrypted video data, it can be found by reading the area identifier ID and each product identifier ID. The product identifier (key identifier) corresponding to the video data is used to decrypt the video data.

Write the generated file description information into the current file set by the file creation module 202; the writing format of the file description information is the same as that in Embodiment 1, and will not be repeated here.

In addition, the set current file may also include information such as the length of the file description information, a start mark, an end mark, and the like.

After writing all the received multi-channel video data into the file created by the file creation module 202, the created file is stored to an external storage device, such as a DVD disc. When the player plays a DVD disc, it can directly play multiple channels of video data at the same time after demultiplexing according to the multiplexing encapsulation format, without considering the problem of time synchronization, because the multiple channels of video data in each multiplexed data block are inherently Synchronize the recorded content, saving the synchronization logic of the player.

In the device proposed in Embodiment 2 of the present invention, the multiplexing and encapsulation module 204 multiplexes and encapsulates multiple channels of video data received in real time to generate multiplexed data blocks after a fixed time interval, and each channel of video in each multiplexed data block The data is stored sequentially. The first multiplexed data writing module 206 or the second multiplexed data writing module 207 writes the multiplexed data blocks generated by the multiplexed package module 204 into the current file set by the file creation module 202. This implementation The example effectively solves the problem of time synchronization when playing multi-channel video data, improves the efficiency of reading and writing multi-channel video data, and avoids the defect of processing multiple video files and heavy work tasks. At the same time, the multiplex video data multiplexing device proposed in this embodiment also includes a file description information writing module, which carries the user's description information on the file name, area identifier ID, and product identifier ID, which can meet user needs.

All or part of the technical solutions provided by the above embodiments can be realized by software programming, and the software program is stored in a readable storage medium, such as a hard disk, an optical disk or a floppy disk in a computer.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. A method for multiplexing multiplexed video data, characterized in that the method comprises: S1: Receive multiple channels of video data in real time; S2: Create a file, limit the maximum storage capacity of the file, and set the file as the current file; S3: after a fixed time, judge whether the multi-channel video data received within the fixed time is empty; S4: When the multi-channel video data received within the fixed time is not empty, multiplex and encapsulate the multiple video data received within the fixed time to generate a multiplexed data block; wherein the multiplexed data The block includes a multiplexed data block identifier, the play time of each channel of video data in the multiplexed data block, and each channel of video data received within the fixed time that is sequentially stored; S5: Determine whether the remaining storage capacity of the current file is greater than or equal to the storage capacity of the multiplexed data block; if yes, perform step S6, otherwise, perform step S7; S6: Write the data in the multiplexed data block to the current file, and return to the step S3; S7: Create a new file in addition, limit the maximum storage capacity of the new file at the same time, and set the new file as the current file, and write the data in the multiplexed data block to the current file , return to the step S3. 2. multiplex video data multiplexing method according to claim 1, is characterized in that, described method also comprises: Generate file description information corresponding to the current file according to user input parameters; Writing the generated file specification information into the current file. 3. The method for multiplexing multiplexed video data according to claim 2, wherein the file description information includes file names, area identifiers, and product identifiers. 4. The method for multiplexing multiplexed video data according to claim 1, wherein the fixed time is preferably 100ms. 5. multiplex video data multiplexing method according to claim 1, is characterized in that, described multiplexing data block also comprises multiplexing data block length, key data; Wherein, the key data is decrypted data when encrypted video data exists in the multiplexed data block. 6. A multiplex video data multiplexing device, characterized in that the device comprises: The video data receiving module is used to receive multi-channel video data in real time; A file creation module, configured to create a file, limit the maximum storage capacity of the file, and set the file as the current file; The video data judging module is used to judge whether the multi-channel video data received within the fixed time is empty after every fixed time; A multiplexing encapsulation module, used to multiplex and encapsulate the multiplexed video data received within the fixed time period when the multiplexed video data received within the fixed time period is not empty, to generate a multiplexed data block; A file storage capacity judging module, configured to judge whether the remaining storage capacity of the current file is greater than or equal to the storage capacity of the multiplexed data block; The first multiplexed data writing module is used to write the data in the multiplexed data block into the current file when the remaining storage capacity of the current file is greater than or equal to the storage capacity of the multiplexed data block ; The second multiplexing data writing module is used to notify the file creation module to create a new file and limit the new file when the remaining storage capacity of the current file is less than the storage capacity of the multiplexing data block. The maximum storage capacity of the file, setting the new file as the current file; writing the data in the multiplexed data block to the current file. 7. The device for multiplexing multiplexed video data according to claim 6, wherein the device also includes a file description information writing module for Generate file description information corresponding to the current file according to user input parameters; Writing the generated file specification information into the current file. 8. The device for multiplexing multiplexed video data according to claim 7, wherein the file description information includes file names, area identifiers, and product identifiers. 9. The device for multiplexing multiplexed video data according to claim 6, wherein the fixed time is preferably 100 ms. 10. multiplex video data multiplexing device according to claim 6, is characterized in that, described multiplexing data block also comprises multiplexing data block length, key data; Wherein, the key data is decrypted data when encrypted video data exists in the multiplexed data block.