CN110784747A - A kind of synchronous playback method of advertising machine - Google Patents

Abstract

The invention discloses a synchronous playing method of an advertising player, which comprises the following steps: step S100: carrying out wireless networking on a plurality of advertisement machines which need to be played synchronously; step S200: the multiple advertising machines adopt NTP protocol to carry out time synchronization; step S300: each advertisement machine starts to play the materials at the same time, preloads the next material before the previous material is played, and then continues to play the preloaded material when the playing starting point of the next material is reached. According to the invention, a plurality of advertisement machines are established into a local area network through a wireless AP, and a time synchronization protocol and a preloading play mode are adopted, so that each advertisement machine device keeps the same time to synchronously play the same material, wherein the material comprises pictures and videos, the synchronous play of the advertisement machines is solved, the problem of scene limitation is solved, no interference signal is introduced, the consistency of local time and loading time is ensured, and the synchronization effect is good.

Description

A kind of synchronous playback method of advertising machine

technical field

The invention relates to the technical field of advertising machines, in particular to a synchronous playing method of advertising machines.

Background technique

With the continuous development and application of advertising machine technology, advertising machines have gradually entered office buildings and communities, and obtaining advertising information through advertising machines has become an indispensable part of people's lives. In the actual demand, there are multiple advertising machines that need to be played to achieve synchronous playback. At present, there are two methods for realizing synchronous playback of multimedia advertising machines on the market: 1) Hardware implementation is a kind of hardware shunting of the output signal of the advertising machine playback box to multiple display screens for display, that is, multiple The display simultaneously displays the signal output by a playback box, so as to achieve the effect of synchronization, but in some scenarios (such as office buildings), the construction is difficult and the cost is high; 2) The software implements the method currently used in the market: when one starts to play, Immediately send messages to other devices. The implementation is relatively simple, but the flexibility is not very good. This method is easy to introduce interference signals and affect the display effect of the display. And the method of advertising synchronous playback according to the time tag, the synchronous playback depends on the local time of each advertising machine terminal, the synchronization effect is not very good due to the delay in receiving the message, inconsistent loading time, unsynchronized local time, etc. .

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a synchronous playback method of an advertising machine, which is used to solve the problem of high cost of hardware synchronization and poor effect of software synchronization in the synchronous playback of advertising machines in the prior art.

The present invention solves the above-mentioned problems through the following technical solutions:

A synchronous playback method for an advertising machine, comprising:

Step S100: wirelessly networking a plurality of advertising machines that need to be played synchronously;

Step S200: multiple advertising machines use the NTP protocol for time synchronization;

Step S300: Each advertising machine starts playing the material at the same time, and preloads the next material before the previous material is played, and then continues to play the preloaded material when the playback start point of the next material is reached. .

The invention establishes a local area network with multiple advertising machines through wireless APs, adopts the time synchronization protocol and the preloading playback mode, so that each advertising machine equipment keeps playing the same material synchronously at the same time. , and is not limited by the scene, and no interference signal is introduced, which ensures consistent local time, consistent loading time, and good synchronization effect.

The two modules of time synchronization and preloading and playing are carried out by networking, and the synchronization method is jointly realized by mutual assistance. Further, the step S200 specifically includes:

Step S210: the client on the advertising machine sends an NTP message to the server, where the NTP message carries the timestamp T1 when leaving the client;

Step S220: when the NTP message reaches the server, the server adds its own time stamp T2; when the response message of the NTP message leaves the server, the server adds its own time stamp T3;

Step S230: when the client receives the response message, the local time of the client is T4;

Step S240: Calculate the time difference between the client and the server:

T2=T1+t+d/2;

T2-T1=t+d/2;

T4=T3-t+d/2;

T3-T4=t-d/2;

Among them, t is the time deviation between the client and the server, and d is the round-trip time between the client and the server, which can be obtained,

d=(T4-T1)-(T3-T2);

t=((T2-T1)+(T3-T4))/2;

Step S250: The multiple advertising machines synchronize the local time according to their respective time offsets t.

NTP (Network Time Protocol, Network Time Protocol) is a protocol used to synchronize the time of each computer in the network. Its purpose is to synchronize the computer's clock to UTC, and its accuracy can reach 0.1ms in the local area network, and its accuracy can reach 1-50ms in most places on the Internet. It can provide high-precision time correction, and can use encrypted confirmation to prevent malicious protocol attacks. NTP has multiple working modes: client/server mode, peer mode, broadcast mode, and multicast mode. This method uses the client/server mode for time synchronization, with the host as the server and the slave as the client.

Further, the step S300 specifically includes:

Step S310: First, initialize the playback time of the first playback material from the playlist, and calculate the playback start time point of the next material according to the playback time and playback duration of the first playback material. Similarly, obtain the current playlist The playback time point of all the materials in the ;

Step S320: Initialize the foreground player to start playing the first material in front of the interface;

Step S330: when the playback reaches S seconds before the end of the current material, start the machine to preload the next material, and pause the playback when the material is loaded and rendered to the first frame;

Step S340: when the playback start time point of the preloaded material is reached, close the foreground player, display the preloaded player, and continue to play the material;

Step S350: Repeat steps S330 to S340 until all materials are played.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The invention adopts the NTP time synchronization protocol and the preloading mode, and the synchronization effect is obviously improved. According to the NTP time synchronization protocol, the host time error calculated by the devices between the local area networks is within 10ms. The playback time error is within 100ms, and the unsynchronized effect cannot be seen by the naked eye; because it is only an application layer software solution, there is no need to modify the system layer code and add additional hardware devices, which reduces the cost, and the synchronization effect is obvious.

Description of drawings

1 is a schematic diagram of time-stamp loading for time synchronization according to the present invention;

Fig. 2 is the time difference calculation schematic diagram of the time synchronization of the present invention;

FIG. 3 is a flow chart of the preload play mode in the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

Example 1:

A synchronous playback method for an advertising machine, comprising:

Step S100: wirelessly networking a plurality of advertising machines that need to be played synchronously;

Step S200: Multiple advertising machines use the NTP protocol for time synchronization, specifically, as shown in Figure 1:

Step S210: the client (client) on the advertising machine sends an NTP message to the server (server), the NTP message carries the timestamp T1 (10000 (T1)) when leaving the client, and the TICK time of the device is taken, That is, the time from the system startup to the present;

Step S220: when the NTP message reaches the server, the server adds its own time stamp T2 (20000(T2)); when the response message of the NTP message leaves the server, the server adds the timestamp T2 (20000(T2)). own timestamp T3(21000(T3));

Step S230: when the client receives the response message, the local time of the client is T4 (13000 (T4));

Step S240: Calculate the time difference between the client (client) and the server (server), as shown in Figure 2:

T2=T1+t+d/2;

T2-T1=t+d/2;

T4=T3-t+d/2;

T3-T4=t-d/2;

Among them, t is the time deviation between the client and the server, and d is the round-trip time between the client and the server, which can be obtained,

d=(T4-T1)-(T3-T2);

t=((T2-T1)+(T3-T4))/2;

Step S250: The multiple advertising machines synchronize the local time according to their respective time deviations t;

Step S300: Each advertising machine starts playing the material at the same time, and preloads the next material before the previous material is played, and then continues to play the preloaded material when the playback start point of the next material is reached. , specifically, as shown in Figure 3:

Step S310: The host and the slave are initialized respectively, and the current playback position of a playlist is constructed to be 0. From the playlist, the playback time of the first playback material is initialized, and the playback time and playback duration of the first playback material are calculated. The playback start time point of the next material, in the same way, get the playback time point of all materials in the current playlist;

Step S320: Initialize the foreground player, and when the playback time is reached, the host and the slave synchronously start playing the first material in front of the interface;

Step S330: when the playback reaches S seconds before the end of the current material (it is a set value, for example, S is set to 4), the next material is preloaded when the machine is turned on, and when the material is loaded and rendered to the first frame, the playback is paused;

Step S340: when the playback start time point of the preloaded material is reached, close the foreground player, display the preloaded player, and continue to play the material;

Step S350: Repeat steps S330 to S340 until all materials are played.

The invention establishes a local area network with multiple advertising machines through wireless APs, adopts the time synchronization protocol and the preloading playback mode, so that each advertising machine equipment keeps playing the same material synchronously at the same time. , and is not limited by the scene, and no interference signal is introduced, which ensures consistent local time, consistent loading time, and good synchronization effect.

Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above-mentioned embodiments are only preferred embodiments of the present invention, and the embodiments of the present invention are not limited by the above-mentioned embodiments, and it should be understood that those skilled in the art Numerous other modifications and embodiments can be devised that will fall within the scope and spirit of the principles disclosed herein.

Claims (3)

1. A synchronous playing method of an advertising player is characterized by comprising the following steps:

step S100: carrying out wireless networking on a plurality of advertisement machines which need to be played synchronously;

step S200: the multiple advertising machines adopt NTP protocol to carry out time synchronization;

step S300: each advertisement machine starts to play the materials at the same time, preloads the next material before the previous material is played, and then continues to play the preloaded material when the playing starting point of the next material is reached.

2. The method for synchronously playing the advertisement player according to claim 1, wherein the step S200 specifically comprises:

step S210: a client on the advertising player sends an NTP message to a server, wherein the NTP message carries a timestamp T1 when the client leaves;

step S220: when the NTP message reaches the server, the server adds a timestamp T2 of the server; when the response message of the NTP message leaves the server, the server adds a timestamp T3 of the server;

step S230: when the client receives the response message, the local time of the client is T4;

step S240: calculating the time difference between the client and the server:

T2＝T1+t+d/2；

T2-T1＝t+d/2；

T4＝T3-t+d/2；

T3-T4＝t-d/2；

where t is the time offset between the client and the server and d is the round trip time between the client and the server, which can be obtained,

d＝(T4-T1)-(T3-T2)；

t＝((T2-T1)+(T3-T4))/2；

step S250: the plurality of advertisement machines synchronize the system clocks according to the respective time offsets t.

3. The method for synchronously playing the advertisement player according to claim 1 or 2, wherein the step S300 specifically comprises:

step S310: firstly, initializing the playing time of a first playing material from a playing list, calculating the playing starting time point of the next material according to the playing time and the playing duration of the first playing material, and similarly, obtaining the playing time points of all the materials in the current playing list;

step S320: initializing a foreground player to start playing a first material in front of an interface;

step S330: starting up to preload the next material when the playing is S seconds before the end of the current material, and pausing the playing when the material is loaded and rendered to the first frame;

step S340: when the playing starting time point of the preloaded material is reached, closing the foreground player, displaying the preloaded player and continuing to play the material;

step S350: the steps S330 to S340 are repeatedly executed until all the material is played.

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