CN104144322A - Method and system for achieving video monitoring on mobile terminal and video processing server - Google Patents
Method and system for achieving video monitoring on mobile terminal and video processing server Download PDFInfo
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- 238000012545 processing Methods 0.000 title claims abstract description 20
- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 238000012856 packing Methods 0.000 claims abstract description 12
- 238000000605 extraction Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 abstract description 19
- 230000006835 compression Effects 0.000 description 7
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- 238000004806 packaging method and process Methods 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 3
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Abstract
The invention relates to a method and system for achieving video monitoring on a mobile terminal and a video processing server. The method comprises the step of receiving video streaming collected by a camera and decoding the video streaming, the step of extracting decoded key frames according to user demands, the step of packing the key frames into a picture format, and the step of pushing the packed picture file to the mobile terminal in a file mode. By means of the method and system for achieving video monitoring on the mobile terminal and the video processing server, the problems of screen blurring and mosaic occurring when the 3G network condition cannot meet the video transmission requirement can be solved .
Description
Technical Field
The present disclosure relates to video monitoring, and in particular, to a method, a system and a video processing server for implementing video monitoring on a mobile terminal.
Background
The application of mobile phone video monitoring services is more and more popular, the mobile phone video monitoring services are widely applied to various fields such as security protection, enterprise display and the like, and the frequency of video browsing on a mobile phone by a user is higher and higher.
The video quality of conventional video surveillance is typically CIF (Common intermediate format, 352 × 288 pixels), D1 (704 × 576 pixels), 720P (1280 × 720 pixels under progressive scan), 1080P (1920 × 1080 pixels under progressive scan) format, and the full frame is 25 frames/S. The code stream condition of the D1 resolution image is about 1.5Mbps, and since the 3G network cannot satisfy the bandwidth required for the image transmission of the D1 or higher resolution format, the image of the D1 or higher resolution format is difficult to normally transmit under the 3G network condition.
In the prior art, a conventional method adopted for solving the problem is to reduce the resolution and the frame rate of a video stream by adding a video transcoding unit and decoding and then encoding a code stream transmitted at the front end so as to adapt to a 3G network transmission environment and mobile phone decoding capability.
Although this method in the prior art reduces the resolution and frame rate of the video stream, there may still be a problem of frame loss during transmission, and if P frames (forward-frame) are lost, it may cause problems of screen-blooming and mosaic.
Disclosure of Invention
The present disclosure proposes a new technical solution in view of at least one of the above problems.
The present disclosure provides, in one aspect thereof, a method for implementing video monitoring on a mobile terminal, which can solve the phenomena of screen splash and mosaic that occur when 3G network conditions do not meet video transmission requirements.
The present disclosure provides, in another aspect thereof, a video processing server that can solve the phenomena of the screen splash and the mosaic that occur when the 3G network conditions do not meet the video transmission requirements.
The present disclosure provides, in yet another aspect thereof, a system for implementing video monitoring on a mobile terminal, which can solve the phenomena of screen splash and mosaic that occur when 3G network conditions do not meet video transmission requirements.
According to the present disclosure, there is provided a method for implementing video monitoring on a mobile terminal, including:
receiving a video stream collected by a camera, and decoding the video stream;
extracting the decoded key frame according to the user requirement;
packing the key frames into a picture format;
and pushing the packaged picture file to the mobile terminal in a file form.
In some embodiments of the disclosure, the method further comprises:
and after receiving the picture files, the mobile terminal continuously displays the pictures in each picture file according to the timestamp information carried by each picture file.
In some embodiments of the present disclosure, the step of extracting the decoded key frame according to the user requirement includes:
judging the continuity requirement of the user on the image;
if the continuity requirement of the user on the image is higher than a set threshold value, extracting each decoded key frame, otherwise, extracting the decoded key frames according to a set time interval.
According to the present disclosure, there is also provided a video processing server, including:
the decoding unit is used for receiving the video stream collected by the camera and decoding the video stream;
the key frame extraction unit is used for extracting the decoded key frame according to the user requirement;
the picture packing unit is used for packing the key frames into a picture format;
and the file pushing unit is used for pushing the packed picture files to the mobile terminal in a file form.
In some embodiments of the present disclosure, the key frame extraction unit includes:
the continuity judging subunit is used for judging the continuity requirement of the user on the image;
and the extraction subunit is used for extracting each decoded key frame if the continuity requirement of the user on the image is higher than a set threshold, and otherwise, extracting the decoded key frames according to a set time interval.
According to the disclosure, a system for implementing video monitoring on a mobile terminal is also provided, which includes the mobile terminal and the video processing server in the foregoing embodiment.
In some embodiments of the present disclosure, after receiving the picture files, the mobile terminal continuously displays the pictures in each picture file according to the timestamp information carried by each picture file.
In the technical scheme of the disclosure, after the video stream is decoded, the video stream is not encoded, but a picture format is formed by using the decoded key frame, and then the picture file is transmitted to the mobile terminal in a file form. The file transmission mode is different from the streaming transmission mode in the prior art, and due to the fact that the problem of frame loss does not exist, the phenomena of screen splash and mosaic which occur when the 3G network condition does not meet the video transmission requirement can be effectively avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, are incorporated in and constitute a part of this application. In the drawings:
fig. 1 is a flowchart illustrating a method for implementing video monitoring on a mobile terminal according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a video processing server according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of a video processing server according to another embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of a system for implementing video monitoring on a mobile terminal according to an embodiment of the present disclosure.
Detailed Description
The present disclosure will be described below with reference to the accompanying drawings. It is to be noted that the following description is merely illustrative and exemplary in nature and is in no way intended to limit the disclosure, its application, or uses. Unless specifically stated otherwise, the relative arrangement of components and steps and numerical expressions and values set forth in the embodiments do not limit the scope of the present disclosure. Additionally, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail but are intended to be part of the specification where appropriate.
In order to solve the problems of screen splash, mosaic and the like which may be generated when the 3G network condition does not meet the video transmission requirement, the following embodiments of the present disclosure do not need to decode first as in the prior art, re-encode after the resolution and frame rate of the video stream are reduced, and transmit the encoded video stream to the mobile terminal. The method and the device directly extract the key frames of the frames decoded by the video stream, convert the extracted key frames into the picture format, and directly transmit the pictures instead of the video stream to the mobile terminal.
Fig. 1 is a flowchart illustrating a method for implementing video monitoring on a mobile terminal according to an embodiment of the present disclosure.
As shown in fig. 1, this embodiment may include the steps of:
s102, receiving a video stream collected by a camera, and decoding the video stream;
in general, key frames and non-key frames are obtained after decoding a video stream.
The key frame is also called an I frame (intra picture), which is an important frame in inter-frame compression coding and is a coded frame of full-frame compression. When decoding, the data of I frame can be used to reconstruct complete image, the I frame can be generated without referring to other pictures, and the video file is composed of a plurality of continuous pictures.
Non-key frames include P-frames and B-frames (bi-directionally interpolated predictive coded frames).
A P frame among the non-key frames is predicted from a P frame or an I frame preceding it, and it is compared with the same information or data between the P frame or the I frame preceding it, i.e., inter-frame compression is performed in consideration of the characteristics of motion.
The B frame in the non-key frame adopts an inter-frame compression algorithm of bidirectional prediction. When compressing a frame into a B frame, it compresses the frame according to the difference of the adjacent previous frame, the current frame and the next frame data, that is, only the difference between the current frame and the previous and next frames is recorded. Only with B-frame compression can 200 be achieved: 1, high compression. Generally, I-frames are the least efficient in compression, P-frames are higher, and B-frames are the highest.
S104, extracting the decoded key frame according to the user requirement;
for example, each decoded key frame may be extracted, or the decoded key frames may be extracted at regular time intervals.
S106, packaging the key frames into a picture format;
that is, each key frame is converted into a picture format and stored as a picture file.
And S108, pushing the packaged picture file to the mobile terminal in a file form.
The embodiment does not encode any more after decoding the video stream, but forms a picture format by using the decoded key frame, and then transmits the picture file to the mobile terminal in a file form. The file transmission mode is different from the streaming transmission mode in the prior art, and due to the fact that the problem of frame loss does not exist, the phenomena of screen splash and mosaic which occur when the 3G network condition does not meet the video transmission requirement can be effectively avoided.
Further, after receiving the picture files, the mobile terminal continuously displays the pictures in each picture file according to the timestamp information carried by each picture file.
Specifically, the time stamp information on each picture may be carried by the file name of each picture file.
In step S104, the step of extracting the decoded key frame according to the user requirement may include:
judging the continuity requirement of the user on the image;
if the requirement of the user on the continuity of the image is higher than a set threshold value, each decoded key frame is extracted to ensure the continuity of the image, otherwise, the decoded key frames are extracted according to a set time interval, and therefore the network load can be reduced on the premise of meeting the requirement of the user.
The embodiment of the disclosure is based on a video stream transcoding image technology, directly discards non-key image frames after decoding a video stream, packs the key image frames into continuous images according to a set strategy (for example, transmitting 1 or several frames of images per second) and then pushes the continuous images to a browsing end, namely, a mobile phone client, and because the mobile phone end does not have video stream information and only receives image files, the phenomena of image screenings, mosaics and the like generated when the 3G network condition does not meet the video transmission requirement can be solved, and the transcoding pressure can be greatly reduced.
Next, the technical solution of the present disclosure will be described in detail by a specific example.
Firstly, the platform transcoding unit decodes the video stream transmitted by the front end after receiving the video stream, and because the requirement on the real-time performance of the picture format is low, the key frame information is packaged into the picture format, so that the problems of mosaic, screen splash and the like can not occur under the condition of insufficient bandwidth.
Secondly, because the file form has low requirement on network bandwidth, the picture can be directly pushed to a mobile phone end playing container in the file form, video decoding is not needed for mobile phone end display, and continuous picture information can be directly displayed in the container.
In addition, the following picture packing strategy is also designed:
(1) packaging all key frames: and packaging all decoded image I frames.
(2) Packing according to fixed interval time, and directly transmitting after packing: for users with low requirements on image continuity, an I frame may be packaged into a picture at regular time intervals (for example, one per second), and the picture is transmitted to the client in a file form after being packaged.
It will be understood by those skilled in the art that all or part of the steps of implementing the above method embodiments may be implemented by hardware associated with program instructions, the program may be stored in a storage medium readable by a computing device, and the program may execute the steps of the above method embodiments when executed, and the storage medium may include various media capable of storing program codes, such as ROM, RAM, magnetic disk and optical disk.
Fig. 2 is a schematic structural diagram of a video processing server according to an embodiment of the present disclosure.
As shown in fig. 2, the video processing server 20 in this embodiment may include a decoding unit 202, a key frame extraction unit 204, a picture packing unit 206, and a file push unit 208. Wherein,
a decoding unit 202, configured to receive a video stream collected by a camera and decode the video stream, where a key frame (i.e., an I frame) and a non-key frame (i.e., a P frame and a B frame) can be obtained after decoding the video stream;
a key frame extracting unit 204, configured to extract the decoded key frames according to user requirements, for example, each decoded key frame may be extracted, or the decoded key frames may be extracted at certain time intervals;
a picture packing unit 206, configured to pack the key frames into a picture format, that is, convert each key frame into a picture format, and store the picture format as a picture file;
and a file pushing unit 208, configured to push the packaged picture file to the mobile terminal in a file form.
The embodiment does not encode any more after decoding the video stream, but forms a picture format by using the decoded key frame, and then transmits the picture file to the mobile terminal in a file form. The file transmission mode is different from the streaming transmission mode in the prior art, and due to the fact that the problem of frame loss does not exist, the phenomena of screen splash and mosaic which occur when the 3G network condition does not meet the video transmission requirement can be effectively avoided.
Fig. 3 is a schematic structural diagram of a video processing server according to another embodiment of the present disclosure.
As shown in fig. 3, compared with the embodiment in fig. 2, the key frame extracting unit 302 in the video processing server 30 of this embodiment may include a continuity judging subunit 302a and an extracting subunit 302 b. Wherein,
a continuity judging subunit 302a, configured to judge a continuity requirement of the user on the image;
the extracting subunit 302b is configured to, if the requirement of the user on the continuity of the image is higher than a set threshold, extract each decoded key frame to ensure the continuity of the image, otherwise, extract the decoded key frames according to a set time interval, so that the network load can be reduced on the premise of meeting the requirement of the user.
Fig. 4 is a schematic structural diagram of a system for implementing video monitoring on a mobile terminal according to an embodiment of the present disclosure.
As shown in fig. 4, the system 40 in this embodiment may include a mobile terminal 402 and a video processing server 404. Wherein, the video processing server can be realized according to the foregoing embodiment.
Further, after receiving the picture files, the mobile terminal continuously displays the pictures in each picture file according to the timestamp information carried by each picture file.
Specifically, the time stamp information on each picture may be carried by the file name of each picture file.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be mutually referred to. For the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the description of the method embodiment section for the relevant points.
The above embodiments of the present disclosure have the following beneficial effects:
(1) because only the video stream is decoded and is not re-encoded any more, the processing load of transcoding is obviously reduced;
(2) the file in the picture format is transmitted to the mobile terminal instead of the video stream, so that the mobile terminal does not need to perform decoding operation, a playing plug-in is not required to be installed in the mobile terminal, and the complexity of the mobile terminal is reduced;
(3) because the file in the picture format is transmitted to the mobile terminal instead of the video stream, the problem of frame loss does not exist in the transmission process, and the problems of screen splash, mosaic and the like in the prior art can not occur.
While the present disclosure has been described with reference to exemplary embodiments, it should be understood that the present disclosure is not limited to the exemplary embodiments described above. It will be apparent to those skilled in the art that the above-described exemplary embodiments may be modified without departing from the scope and spirit of the disclosure. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (7)
1. A method for realizing video monitoring on a mobile terminal is characterized by comprising the following steps:
receiving a video stream collected by a camera, and decoding the video stream;
extracting the decoded key frame according to the user requirement;
packing the key frames into a picture format;
and pushing the packaged picture file to the mobile terminal in a file form.
2. The method for implementing video surveillance on a mobile terminal according to claim 1, further comprising:
and after receiving the picture files, the mobile terminal continuously displays the pictures in each picture file according to the timestamp information carried by each picture file.
3. The method of claim 1, wherein the step of extracting the decoded key frames according to the user requirement comprises:
judging the continuity requirement of the user on the image;
if the continuity requirement of the user on the image is higher than a set threshold value, extracting each decoded key frame, otherwise, extracting the decoded key frames according to a set time interval.
4. A video processing server, comprising:
the decoding unit is used for receiving the video stream collected by the camera and decoding the video stream;
the key frame extraction unit is used for extracting the decoded key frame according to the user requirement;
the picture packing unit is used for packing the key frames into a picture format;
and the file pushing unit is used for pushing the packed picture files to the mobile terminal in a file form.
5. The video processing server according to claim 4, wherein the key frame extraction unit comprises:
the continuity judging subunit is used for judging the continuity requirement of the user on the image;
and the extraction subunit is used for extracting each decoded key frame if the continuity requirement of the user on the image is higher than a set threshold, and otherwise, extracting the decoded key frames according to a set time interval.
6. A system for implementing video monitoring on a mobile terminal, characterized in that it comprises a mobile terminal and a video processing server according to any one of claims 4 to 5.
7. The system according to claim 6, wherein the mobile terminal continuously displays the pictures in each picture file according to the timestamp information carried by each picture file after receiving the picture file.
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| CN114222124A (en) * | 2021-11-29 | 2022-03-22 | 广州波视信息科技股份有限公司 | Encoding and decoding method and device |
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| CN111147928A (en) * | 2019-12-03 | 2020-05-12 | 西安万像电子科技有限公司 | Video processing method, server, terminal and system |
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| CN114222124A (en) * | 2021-11-29 | 2022-03-22 | 广州波视信息科技股份有限公司 | Encoding and decoding method and device |
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Application publication date: 20141112 |