CN107800989B - Video display method and system based on dynamic frame rate detection and network video recorder - Google Patents
Video display method and system based on dynamic frame rate detection and network video recorder Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440281—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the temporal resolution, e.g. by frame skipping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0127—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter
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Abstract
The invention discloses a video display method, a system and a network video recorder based on dynamic frame rate detection, wherein the video display method comprises the following steps: A. the network camera collects video data, encodes the video data and sends the encoded code stream to the network video recorder; B. the network video recorder detects the frame rate of the received code stream, records the changed frame rate if the frame rate is detected to be changed, and decodes the code stream according to the changed frame rate; C. and sending the decoded video data to a display for displaying. The invention detects the frame rate before decoding the received code stream, thus when the frame rate is detected to be changed, the decoding is carried out according to the changed frame rate, thereby thoroughly solving the problems of abnormal and pause video and improving the fluency of video playing.
Description
Technical Field
The invention relates to the field of security monitoring, in particular to a video display method and system based on dynamic frame rate detection and a network video recorder.
Background
With the rapid development of internet technology in recent years, the security video monitoring industry also enters the networking and intelligent era. The security network monitoring in the networking and intelligent era is showing strong characteristics of the internet industry.
In a security video monitoring system, when code stream data sent by an IPC (internet protocol camera) is previewed and played back by an NVR (network video recorder), the frame rate of the video data changes in real time, so that the problems of abnormal pictures, video blocking and the like of a video during decoding can be caused. The main reason for this problem is that IPC is used to achieve better video monitoring effect in a special environment during monitoring, so that the frame rate is adjusted to a certain extent. For example, at night, IPC may perform frame dropping processing, which may cause the frame rate of the actual video data to change.
Because the frame rate of the security industry accessing the IPC can not be changed greatly, the processing in this aspect is less, but under a special scene, the frame rate change is required, and at the moment, the problems are generally solved by manually adjusting or counting for a long time and using the average frame rate. However, the solution has the defects that manual intervention and statistics are needed, and the problems of video blocking, screen splash and the like when the frame rate changes still exist.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a video display method and system based on dynamic frame rate detection and a network video recorder, and aims to solve the problems of blockage, screen splash and the like of security videos in the prior art.
The technical scheme of the invention is as follows:
a video display method based on dynamic frame rate detection comprises the following steps:
A. the network camera collects video data, encodes the video data and sends the encoded code stream to the network video recorder;
B. the network video recorder detects the frame rate of the received code stream, records the changed frame rate if the frame rate is detected to be changed, and decodes the code stream according to the changed frame rate;
C. and sending the decoded video data to a display for displaying.
In the step B, after receiving the code stream, the network video recorder stores the code stream.
In the step C, the video is output to a display through a VGA/HDMI interface for displaying.
The video display method based on dynamic frame rate detection, wherein the step a specifically includes:
a1, the network camera collects video data and encodes the video data, and sends the encoded code stream to the switch;
a2, the exchanger transmits the code stream to the network video recorder.
The video display method based on dynamic frame rate detection, wherein the step C is followed by further comprising:
and after receiving the playback instruction, the network video recorder reads the stored code stream, performs frame rate detection, records the changed frame rate if the frame rate is detected to be changed, decodes the code stream according to the changed frame rate, and then sends the code stream to the display for displaying.
The video display method based on dynamic frame rate detection, wherein the step C is followed by further comprising:
and after the network video recorder receives the adding instruction, searching the network video camera and adding the searched network video camera.
A network video recorder, comprising:
the stream receiving module is used for receiving the code stream; the code stream is obtained after the network camera collects and codes the video;
the frame rate detection module is used for carrying out frame rate detection on the received code stream, and recording the frame rate after the change if the frame rate is detected to be changed;
the decoding module is used for decoding the code stream according to the changed frame rate;
and the output module is used for sending the decoded video data to a display for displaying.
The network video recorder further comprises:
and the code stream storage module is used for storing the received code stream.
A video display system based on dynamic frame rate detection comprises a network camera, a network video recorder and a display screen which are connected in sequence;
the network camera collects video data, encodes the video data and sends the encoded code stream to the network video recorder;
the network video recorder detects the frame rate of the received code stream, records the changed frame rate if the frame rate is detected to be changed, and decodes the code stream according to the changed frame rate; then sending the decoded video data to a display;
the display displays the received video data.
The video display system based on the dynamic frame rate detection is characterized in that the network video recorder is connected to a display through a VGA/HDMI interface.
Has the advantages that: the invention detects the frame rate before decoding the received code stream, thus when the frame rate is detected to be changed, the decoding is carried out according to the changed frame rate, thereby thoroughly solving the problems of abnormal and pause video and improving the fluency of video playing.
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FIG. 1 is a flowchart illustrating a video display method based on dynamic frame rate detection according to a preferred embodiment of the present invention.
FIG. 2 is a schematic block diagram of the method of the present invention.
FIG. 3 is a block diagram of a video display system according to the present invention.
Detailed Description
The present invention provides a preview and playback method and system based on dynamic frame rate detection, and the following further describes the present invention in detail in order to make the purpose, technical scheme and effect of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a video display method based on dynamic frame rate detection according to a preferred embodiment of the present invention, which includes the following steps:
s1, the network camera collects video data and encodes the video data, and then the encoded code stream is sent to the network video recorder;
s2, the network video recorder detects the frame rate of the received code stream, if the frame rate is detected to be changed, the changed frame rate is recorded, and the code stream is decoded according to the changed frame rate;
and S3, sending the decoded video data to a display for displaying.
In the method, before the code stream is decoded and displayed, the frame rate of the code stream is detected, so that whether the frame rate of the code stream changes or not can be accurately judged, if so, the code stream is decoded according to the changed frame rate, and the situations of blocking, screen splash and the like can not occur even if the frame rate changes.
Further, the step S1 specifically includes:
s11, the network camera collects video data and encodes the video data, and sends the encoded code stream to the switch;
and S12, the exchanger forwards the encoded code stream to the network video recorder.
As shown in fig. 2, in the step S11, the terminal device web cam (IPC)100 is the main source of video capture. After the network camera 100 collects the video data, the video data is encoded, and the encoded code stream is sent to the switch. The network camera 100 may be provided in plural, for example, 10, and collectively transmitted to the switch.
In step S12, the switch is used to forward the compressed and encoded code stream, that is, forward the code stream to the network video recorder 200.
In step S2, after receiving the code stream, the network video recorder 200 performs frame rate detection on the received code stream.
The step is mainly to judge whether the frame rate is changed, if the frame rate is changed and decoding is carried out according to the frame rate before the change, phenomena such as blocking or screen splash and the like can occur. Therefore, when the frame rate is detected to change, the changed frame rate is recorded, and the code stream is decoded according to the changed frame rate, so that video playing can be smoother before and after the frame rate is changed, and the problems of sudden playing jam and the like when the frame rate is changed can be avoided. In the prior art, the processing of step S2 is not performed, and decoding is performed directly at a uniform frame rate after the code stream is received, which causes problems such as deadlock.
In step S3, the decoded video data is sent to the display 300 for display.
For a plurality of network cameras 100, the processing of step S2 may be performed, and then each processed code stream is integrated, that is, multiple paths of data are integrated and then sent to the display 300 for displaying.
Further, in step S3, the output is output to the display 300 through the VGA/HDMI interface for display. The VGA or HDMI interface can realize the transmission of video data.
Further, in step S2, after receiving the code stream, the network video recorder 200 stores the code stream. The code stream is saved for playback convenience, so that the video can be called and browsed.
Specifically, the step S3 is followed by:
after receiving the playback instruction, the network video recorder 200 reads the stored code stream, performs frame rate detection, records the changed frame rate if the frame rate is detected to be changed, decodes the code stream according to the changed frame rate, and then sends the code stream to the display 300 for display.
The playback process is similar to the real-time playing process, but the stored code stream needs to be read, and then frame rate detection is performed, and for the case of frame rate change, the changed frame rate is recorded, and then decoding and displaying are performed according to the changed frame rate.
Therefore, the problems of video blockage or screen splash and the like can not occur in the video playback process, and the smoothness of the playback process is ensured.
Further, the step S3 is followed by:
after receiving the addition instruction, the network video recorder 200 searches for the network video camera 100 and adds the searched network video camera 100.
The network video recorder 200 can search the network video cameras 100 in the network, add the searched network video cameras 100 to the whole system, receive the video data shot by the newly added network video cameras 100, and perform real-time monitoring and playback.
The main processes of the dynamic frame rate detection at preview and playback are shown in fig. 2, wherein A, B, C is the process of decoding the display at the dynamic frame rate detection at preview, and D, E, B, C is the process of decoding the display at the dynamic frame rate detection at playback.
A. Sending the code stream received by the stream receiving module 210 to the frame rate detection module 220 to provide a video source for frame rate detection;
B. the frame rate detection module 220 determines whether the current frame rate changes, and if so, sets the changed frame rate into a decoder (i.e., the decoding module 230) to ensure that the video frame rate in the decoder is consistent with the frame rate of the video to be decoded;
C. sending the decoded video data and the interface data to VGA/HDMI for output and display;
D. the code stream received by the stream receiving module 210 is stored in the code stream storage module 250 so as to be viewed and played back later;
E. acquiring the code stream from the code stream storage module 250, and sending the code stream to the frame rate detection module 220 for frame rate judgment;
F. the search addition module 260 sends a search command to the IPC over the network and adds to the IPC.
The frame rate is how many frames there are in a video played in one second. A frame is a basic unit constituting a video. The video file itself is composed of many continuous pictures, and simply understood as the frame rate is the number of pictures recorded in one second (in practice, the pictures are compressed, and a frame of data is not necessarily stored as a complete picture).
Key frames, also called I-frames, are important frames in inter-frame compression coding, the interval adjustment of I-frames affects GOP length and thus GOP reading speed, if the I-frame interval is set too large, it may be forced to replace I-frames with B/P-frames, i.e. to reduce picture quality, if I-frame interval is set too large, I-frames are the basis of inter-frame compression, for example, a typical GOP (IBP frame packet) structure is generally: ibbpbbpbbpbbbpbb, B is a previous and a next reference frame, i.e. data of the current frame is obtained by referring to data of the previous and the next frames and adding the change of the current frame, and P is a forward reference frame, explaining and referring to the B frame.
The frame rate detection can be realized by detecting the interval of the I frame, namely, whether the frame rate change occurs in the transmitted code stream is judged, and the dynamic frame rate detection can be realized.
The present invention further provides a network video recorder 200, as shown in fig. 2, which includes:
a stream receiving module 210, configured to receive a code stream; the code stream is obtained after the network camera collects and codes the video;
a frame rate detection module 220, configured to perform frame rate detection on the received code stream, and record a frame rate after the change if the frame rate is detected to be changed;
a decoding module 230, configured to decode the code stream according to the changed frame rate;
and an output module 240, configured to send the decoded video data to a display for displaying.
Further, the network video recorder 200 further includes:
and a code stream storage module 250, configured to store the received code stream.
The search adding module 260 is configured to search the network camera 100 after receiving the adding instruction, and add the searched network camera 100.
The details of the network video recorder are described in the above-mentioned method, and thus are not described again.
The invention also provides a video display system based on dynamic frame rate detection, as shown in fig. 3, which comprises a network camera 100, a network video recorder 200 and a display screen 300 which are connected in sequence;
the network camera 100 acquires video data, encodes the video data, and sends the encoded code stream to the network video recorder 200;
the network video recorder 200 detects the frame rate of the received code stream, records the changed frame rate if the frame rate is detected to be changed, and decodes the code stream according to the changed frame rate; then sends the decoded video data to the display 300;
the display 300 displays the received video data.
Further, the network video recorder 200 is connected to the display 300 through a VGA/HDMI interface.
Further, an exchanger 400 is connected between the network camera 100 and the network video recorder 200, and the exchanger 400 can receive the code streams sent by the multiple paths of network cameras 100 and forward the code streams to the network video recorder 200.
The technical details of the system module are described in detail in the foregoing method, and thus are not described again.
In summary, the frame rate is detected before the received code stream is decoded, so that when the frame rate is detected to be changed, the decoding is performed according to the changed frame rate, thereby thoroughly solving the problems of video abnormality and video blockage, and improving the fluency of video playing.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (9)
1. A video display method based on dynamic frame rate detection is characterized by comprising the following steps:
A. the network camera collects video data, encodes the video data and sends the encoded code stream to the network video recorder;
B. the network video recorder detects the frame rate of the received code stream, records the changed frame rate if the frame rate is detected to be changed, and decodes the code stream according to the changed frame rate;
C. sending the decoded video data to a display for displaying;
the step C is followed by:
and after receiving the playback instruction, the network video recorder reads the stored code stream, performs frame rate detection, records the changed frame rate if the frame rate is detected to be changed, decodes the code stream according to the changed frame rate, and then sends the code stream to the display for displaying.
2. The video display method based on dynamic frame rate detection as claimed in claim 1, wherein in said step B, after the network video recorder receives the code stream, the network video recorder stores the code stream.
3. The method as claimed in claim 1, wherein in the step C, the video is outputted to a display via a VGA/HDMI interface for displaying.
4. The video display method based on dynamic frame rate detection according to claim 1, wherein the step a specifically comprises:
a1, the network camera collects video data and encodes the video data, and sends the encoded code stream to the switch;
a2, the exchanger transmits the code stream to the network video recorder.
5. The method for displaying video based on dynamic frame rate detection according to claim 1, further comprising, after the step C:
and after the network video recorder receives the adding instruction, searching the network video camera and adding the searched network video camera.
6. A network video recorder, wherein the video display method based on dynamic frame rate detection as claimed in any one of claims 1 to 5 is applied, and comprises:
the stream receiving module is used for receiving the code stream; the code stream is obtained after the network camera collects and codes the video;
the frame rate detection module is used for carrying out frame rate detection on the received code stream, and recording the frame rate after the change if the frame rate is detected to be changed;
the decoding module is used for decoding the code stream according to the changed frame rate;
and the output module is used for sending the decoded video data to a display for displaying.
7. The network video recorder of claim 6, further comprising:
and the code stream storage module is used for storing the received code stream.
8. A video display system based on dynamic frame rate detection is characterized by comprising a network camera, a network video recorder and a display screen which are sequentially connected;
the network camera collects video data, encodes the video data and sends the encoded code stream to the network video recorder;
the network video recorder detects the frame rate of the received code stream, records the changed frame rate if the frame rate is detected to be changed, and decodes the code stream according to the changed frame rate; then sending the decoded video data to a display;
the display displays the received video data;
after the display displays the received video data, the method further comprises the following steps:
and after receiving the playback instruction, the network video recorder reads the stored code stream, performs frame rate detection, records the changed frame rate if the frame rate is detected to be changed, decodes the code stream according to the changed frame rate, and then sends the code stream to the display for displaying.
9. The video display system based on dynamic frame rate detection as claimed in claim 8, wherein the network video recorder is connected to the display through a VGA/HDMI interface.
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| CN109157839B (en) * | 2018-10-16 | 2022-10-11 | Oppo广东移动通信有限公司 | Frame rate regulation and control method, device, storage medium and terminal |
| CN110446099B (en) * | 2019-08-14 | 2021-06-15 | 北京壹灵壹教育科技股份有限公司 | Local area network cross-platform screen broadcasting system |
| CN111240984A (en) * | 2020-01-15 | 2020-06-05 | 中国平安财产保险股份有限公司 | Abnormal page identification method and device, computer equipment and storage medium |
| CN111312149B (en) * | 2020-03-10 | 2023-12-08 | Tcl华星光电技术有限公司 | Driving method and driving device |
| CN117459771B (en) * | 2023-12-26 | 2024-04-19 | 杭州睿盯科技有限公司 | Method and system for storing, previewing and replaying video of network camera |
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| CN101692711A (en) * | 2009-09-08 | 2010-04-07 | 中兴通讯股份有限公司 | Method for encoding and decoding video, system and video monitoring system |
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