CN112004132B - Video synchronous playing method and device - Google Patents
Video synchronous playing method and device Download PDFInfo
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- CN112004132B CN112004132B CN202010908079.3A CN202010908079A CN112004132B CN 112004132 B CN112004132 B CN 112004132B CN 202010908079 A CN202010908079 A CN 202010908079A CN 112004132 B CN112004132 B CN 112004132B
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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
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play
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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
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
Abstract
The application relates to a video synchronous playing method and device. The video synchronous playing method is used for a terminal and comprises the following steps: acquiring standard playing time of a video to be played relative to a reference server; determining the time difference between the local and the reference server, and determining the local actual playing time of the video to be played according to the standard playing time of the video to be played and the time difference; and acquiring a corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time, and playing. The video synchronous playing method and device can achieve multi-terminal synchronous playing.
Description
Technical Field
The present application relates to the field of internet technologies, and in particular, to a method and an apparatus for synchronously playing videos, a computing device, and a computer-readable storage medium.
Background
In order to solve the technical problem that each playing terminal simultaneously and synchronously plays the same video in the prior art, especially in a complex network environment, a method generally adopted is that each terminal independently controls the playing progress of each terminal in the process of playing the video, or the playing synchronization of each terminal is ensured through a live streaming service. However, the conventional video playing scheme cannot ensure that each terminal accessing the system keeps synchronous all the time during playing.
Therefore, how to ensure that the terminals are always synchronized during the video playing becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present application provides a method and an apparatus for video synchronous playing, a computing device and a computer-readable storage medium, so as to solve the technical defects in the prior art.
Specifically, the application provides the following technical scheme:
a first aspect of the present application provides a method for synchronously playing video, which is used for a terminal and includes the following steps:
acquiring standard playing time of a video to be played relative to a reference server;
determining the time difference between the local and the reference server, and determining the local actual playing time of the video to be played according to the standard playing time of the video to be played and the time difference;
and acquiring a corresponding video clip from the storage address of the video to be played according to the local current time and the local actual playing time, and playing.
Optionally, for the video synchronous playing method, acquiring and playing a corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time, including:
comparing the local current time with the local actual playing time to determine a video clip of the video to be played corresponding to the local current time;
and acquiring the corresponding video clip from the storage address of the video to be played and playing the video clip.
Optionally, for the video synchronous playing method, acquiring and playing a corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time, including:
comparing the local current time with the starting playing time in the local actual playing time;
under the condition that the local current time is earlier than the playing starting time, acquiring a first video clip of the video to be played from the storage address of the video to be played as an initial playing video clip and playing at the playing starting time in the local actual playing time;
and under the condition that the local current time is later than the playing starting time, determining the video clip of the video to be played corresponding to the local current time, and acquiring the corresponding video clip from the storage address of the video to be played and playing the video clip.
Optionally, for the video synchronous playing method, the method further includes:
and monitoring the playing position of the video to be played in a preset monitoring period in the playing process of the video to be played.
Optionally, for the video synchronous playing method, the monitoring period is less than or equal to a preset error threshold;
monitoring the playing position of the video to be played in a preset monitoring period in the playing process of the video to be played, and the monitoring method comprises the following steps:
determining an expected playing position of the video to be played at the monitoring point of the monitoring period according to the local actual playing time, and acquiring the current playing position of the video to be played;
and under the condition that the difference value between the expected playing position and the current playing position of the video to be played exceeds the error threshold value, adjusting the playing of the video to be played.
Optionally, for the video synchronous playing method, when the difference exceeds the error threshold, adjusting the playing of the video to be played includes:
under the condition that the current playing position of the video to be played is faster than the expected playing position, pausing playing the video to be played or slowing down playing the video to be played;
and under the condition that the current playing position of the video to be played is slower than the expected playing position, acquiring a video clip corresponding to the expected playing position and playing the video clip, or accelerating to play the video to be played.
Optionally, for the video synchronous playing method, acquiring the video segment corresponding to the expected playing position includes:
searching whether a video clip corresponding to the expected playing position is included in the downloaded video clips;
if not, stopping the currently downloaded video clip and downloading the video clip corresponding to the expected playing position from the storage address of the video to be played.
Optionally, for the video synchronous playing method, the videos to be played are stored in multiple service nodes in a fragment form in a distributed manner, and include an index file and a video fragment file;
the video synchronous playing method further comprises the following steps:
determining an optimal service node in the plurality of service nodes based on the connection speed, and downloading the index file of the video to be played from the optimal service node; and downloading the video clip file according to the index file and decoding.
Optionally, for the video synchronized playing method, determining a time difference between the local server and the reference server includes:
accessing the reference server and sending a time synchronization request to the reference server;
receiving time synchronization request feedback of the reference server and recording received local time t4, wherein the time synchronization request feedback comprises local time t1 when the terminal sends a time synchronization request, time t2 when the reference server receives the time synchronization request and time t3 when the reference server issues the time synchronization request feedback;
and determining the time difference between the local and the reference server according to the t1, the t2, the t3 and the t 4.
Optionally, for the video synchronous playing method, the method further includes:
monitoring and adjusting the playing position of the video to be played at the monitoring point of the current monitoring period for a time exceeding the monitoring period;
and for the next monitoring period, determining an expected playing position corresponding to the monitoring point of the next monitoring period by adopting a preset control algorithm based on the difference between the monitoring and adjusting time of the current monitoring period and the monitoring period.
Optionally, for the video synchronous playing method, the method further includes:
pre-calculating the expected downloading time of the video clip corresponding to the expected playing position according to the current downloading speed;
and under the condition that the end point of the expected downloading time exceeds the actual playing time corresponding to the expected playing position, determining the optimal downloaded video clip according to the expected downloading time and determining the updated expected playing position.
The second aspect of the present application provides a video synchronous playing device, which is used for a terminal, and includes:
the acquisition module is configured to acquire the standard playing time of the video to be played relative to the reference server;
the time module is configured to determine a time difference between a local part and the reference server, and determine a local actual playing time of the video to be played according to a standard playing time of the video to be played and the time difference;
and the playing module is configured to acquire and play the corresponding video clip from the storage address of the video to be played according to the local current time and the local actual playing time.
A third aspect of the present application provides a computing device, comprising a memory, a processor and computer instructions stored on the memory and executable on the processor, wherein the processor executes the instructions to implement the steps of the video synchronized playback method.
A fourth aspect of the present application provides a computer-readable storage medium, which stores computer instructions, wherein the computer instructions, when executed by a processor, implement the steps of the aforementioned video synchronized playing method.
The application provides a video synchronous playing method, which comprises the steps of obtaining standard playing time relative to a reference server, determining the time difference between a local part and the reference server, determining the local actual playing time of a video to be played according to the standard playing time of the video to be played and the time difference, determining the actual playing time relative to the reference server for different playing terminals through the steps, and providing a basis for realizing synchronous playing of the video by different terminals; according to the method and the device, the corresponding video clips are obtained from the storage addresses of the videos to be played and played according to the local current time and the local actual playing time, the video clips played by different terminals are all the video clips corresponding to the standard playing time of the reference server, and therefore synchronous playing of multiple terminals is achieved.
The video synchronous playing method provided by the application also comprises the steps of monitoring the playing position of the video to be played in a preset monitoring period in the process of playing the video, and adjusting the playing position of the video to be played in time under the condition that the error of the playing position is greater than the error threshold value, so that the multiple terminals are kept synchronous all the time during the video playing.
Drawings
Fig. 1 is a schematic flowchart of a video synchronous playing method according to an embodiment of the present application;
fig. 2a is a schematic scene diagram of a video synchronous playing method according to an embodiment of the present application;
fig. 2b is a scene schematic diagram of a video synchronous playing method according to an embodiment of the present application;
fig. 3 is a scene schematic diagram of a video synchronous playing method according to an embodiment of the present application;
fig. 4a is a scene schematic diagram of a video synchronous playing method according to an embodiment of the present application;
fig. 4b is a scene schematic diagram of a video synchronous playing method according to an embodiment of the present application;
fig. 5 is a schematic flowchart of a video synchronous playing method according to a second embodiment of the present application;
fig. 6a is a scene schematic diagram of a video synchronous playing method according to a second embodiment of the present application;
fig. 6b is a schematic scene diagram of a video synchronous playing method according to the second embodiment of the present application;
fig. 7 is a schematic structural diagram of a video synchronous playing device according to a third embodiment of the present application;
fig. 8 is a schematic structural diagram of a computing device according to a fourth embodiment of the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The terminology used in the description of the one or more embodiments is for the purpose of describing the particular embodiments only and is not intended to be limiting of the description of the one or more embodiments. As used in one or more embodiments of the present specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in one or more embodiments of the present specification refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The word "if," as used herein, may be interpreted as "at \8230; \8230when" or "when 8230; \823030when" or "in response to a determination," depending on the context.
First, the noun terms to which one or more embodiments of the present invention relate are explained.
A reference server: the time difference is determined by a server used for determining the time difference with the local time of the terminal, and the time of the reference server is taken as the reference standard time; the reference server can be a time server or a server for storage, and the type of the reference server is not specifically limited in the application and can be selected according to actual requirements.
A terminal: the term "input/output device" refers broadly to a general term for all input/output devices, such as a keyboard, a mouse, a camera, a microphone, a screen, a printer, etc.; the present application specifically refers to a playing terminal having a video playing function, such as a television, a mobile phone, and the like.
PID (Proportional-Derivative-Integral) control: the PID control is a control amount formed by linearly combining the proportion (P), integral (I) and derivative (D) of the error signal.
In the present application, a video synchronous playing method and apparatus, a computing device and a computer readable storage medium are provided, which are described in detail in the following embodiments one by one.
Example one
The present embodiment provides a video synchronous playing method for a terminal, and referring to fig. 1, fig. 1 shows a flowchart of the video synchronous playing method provided by the present embodiment, which includes steps S101 to S103.
S101, acquiring standard playing time of a video to be played relative to a reference server.
The video synchronous playing scheme provided by the application is applied to the terminal, and the terminal is a general term of all input and output devices in a broad sense, such as a keyboard, a mouse, a camera, a microphone, a screen, a printer and the like; the "terminal" in this application specifically refers to a playing terminal with a video playing function, such as a television, a mobile phone, and the like.
In the case that a terminal actually plays a video, the time for accessing the playing system by different terminals is completely random, and a time error also exists in the local time corresponding to different terminals, so that in order to ensure that synchronous playing can be achieved between different terminals randomly accessed in the playing process, a reference server serving as a reference for playing time needs to be determined for different terminals.
The reference server in the present application refers to a server for determining a time difference with a local time of a terminal, and takes a time of the reference server as a reference standard time; the reference server can be a time server or a server for storage, and the type and the function of the reference server are not specifically limited and can be selected according to actual requirements.
For example, fig. 2a and fig. 2b show a scene schematic diagram of a connection mode between different terminals and a reference server in the video synchronous playing method provided by the present invention, where the terminals 1 to 5 are connected to a storage server through a network, respectively, the storage server is used as the reference server, and the video playing time relative to the storage server is used as the standard playing time; in fig. 2b, a terminal 1 and a terminal 2 are connected to a storage server 1 through a network for obtaining a video to be played, terminals 3 to 5 are connected to the storage server 2 through a network for obtaining a video to be played, and the terminals 1 to 5 are connected to an independent time server through a network, where the time server is a reference server for determining a standard playing time of the video to be played. Fig. 2a and 2b provided in the present application are only schematic schemes in which different terminals are connected to a reference server through a network, and in practical applications, the reference server may be selected according to specific situations of the technical schemes.
Further, under the condition that the terminal randomly accesses to the playing system of the video to be played, the standard playing time of the video to be played relative to the reference server is obtained.
S102, determining the time difference between the local and the reference server, and determining the local actual playing time of the video to be played according to the standard playing time of the video to be played and the time difference.
As shown in fig. 3, fig. 3 is a schematic view of a scenario in which different terminals and a reference server determine time differences in the present application, and fig. 3 illustrates two different terminals as an example, where time of the reference server is t0, local time of the terminal 1 is t1, and local time of the terminal 2 is t2, then time difference Δ t1 between the terminal 1 and the reference server is t1-t0, and time difference Δ t2 between the terminal 2 and the reference server is t2-t0.
Specifically, the playing time of the video to be played relative to the reference server is used as a standard playing time, and after the time difference between the terminal and the reference server is determined, the local actual playing time of the video to be played is calculated according to the standard playing time and the time difference.
For example, when the reference server time is 8: +3s, -2s and +5s, and then determining the local actual playing time from the terminal 1 to the terminal 3 according to the time difference and the standard playing time of the video to be played, see table 1 below, where table 1 shows the relationship between the standard playing time and the actual playing time of the video to be played at different terminals.
TABLE 1
As can be seen from the above table, taking the example that the video to be played is divided into 5 video segments to be played, and each video segment is only played at the beginning of time, where each video segment has a standard playing time relative to the reference server, and the time differences between the terminals 1 and 3 respectively relative to the reference server have been determined according to the foregoing contents, then each terminal determines the local actual playing time of the terminal according to the time differences and the standard playing time of each video segment of the video to be played. Further, the standard playing time of the video slice of the video to be played may be a time point at which playing starts, or may be a range of playing times. For example, "video clip 1, 9. The present application does not specifically limit the standard playing time of the video clip as the time point for starting playing or the playing time range of the video clip.
Further, in the video synchronous playing method provided by the present application, determining a time difference between the local server and the reference server includes:
accessing the reference server and sending a time synchronization request to the reference server;
receiving time synchronization request feedback of the reference server and recording received local time t4, wherein the time synchronization request feedback comprises local time t1 when the terminal sends a time synchronization request, time t2 when the reference server receives the time synchronization request and time t3 when the reference server issues the time synchronization request feedback;
and determining the time difference between the local and the reference server according to the t1, the t2, the t3 and the t 4.
In the method, the terminal sends the time setting request to the reference server to determine the time difference between the local terminal and the reference server, so that the time setting time difference of the terminal relative to the reference server can be determined quickly and accurately.
Further, in the present application, an average value of two time differences t2-t1 and t4-t3 may be used as the time difference, or the time difference may be calculated based on a time difference calculation algorithm used in the prior art, and the time difference calculation method is not specifically limited in the present application.
S103, acquiring a corresponding video clip from the storage address of the video to be played according to the local current time and the local actual playing time, and playing.
Specifically, referring to the contents in table 1, for example, if the current time of the terminal 1 is 9.
Further, because the time when different terminals access the system for playing video to be played has randomness, the following two situations can be distinguished: when the terminal is accessed, the video to be played does not start to be played; or when the terminal is accessed, the video to be played is played for a period of time.
Further, in the video synchronous playing method provided by the present application, acquiring and playing the corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time includes:
comparing the local current time with the local actual playing time to determine a video clip of the video to be played corresponding to the local current time;
and acquiring the corresponding video clip from the storage address of the video to be played and playing the video clip.
Further, acquiring a corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time and playing the video segment comprises:
comparing the local current time with the starting playing time in the local actual playing time;
under the condition that the local current time is earlier than the playing starting time, acquiring a first video clip of the video to be played from the storage address of the video to be played as an initial playing video clip and playing at the playing starting time in the local actual playing time;
and under the condition that the local current time is later than the playing starting time, determining the video clip of the video to be played corresponding to the local current time, and acquiring the corresponding video clip from the storage address of the video to be played and playing the video clip.
Specifically, referring to fig. 4a, fig. 4a is a schematic view of a scene in which a local current time is earlier than a start playing time in the local actual playing time, specifically: the actual playing time of the video to be played in the terminal A is 9-00, wherein 9; the current local time of the terminal a is 8, and is earlier than the playing start time 9 in the actual local playing time, the terminal a acquires the first video clip in the storage address of the video to be played as the starting playing video clip, and waits for 9 00, and starts to play the first video clip P1 of the video to be played from 9.
Referring to fig. 4b, fig. 4b is a scene schematic diagram illustrating a situation that the current time at the local is later than the actual start playing time at the local, specifically: the actual playing time of the video to be played at the terminal B is 9-00, wherein 9; the local current time of the terminal B is 9, 13 is later than the playing start time 9 in the local actual playing time, 00, and the terminal B determines a video clip corresponding to the local current time 9, which can be seen as a second video clip P2 in the figure, and acquires the P2 from the storage address of the video to be played and starts playing from the current time 9.
According to the video synchronous playing method, the video clip of the video to be played corresponding to the local current time is determined by comparing the local current time with the local actual playing time, the playing clip of the video to be played corresponding to the local current time of the terminal can be rapidly and accurately determined for different terminals in a complex video playing system, and the different terminals are all based on the local actual playing time of the video to be played determined by the reference server, so that the synchronous playing of the video to be played by the different terminals accessed at any time can be realized.
Further, in the video synchronous playing method provided by the application, the video to be played is stored in a plurality of service nodes in a fragment form in a distributed manner, and the video to be played includes an index file and a video clip file;
the video synchronous playing method further comprises the following steps:
determining an optimal service node in the plurality of service nodes based on the connection speed, and downloading the index file of the video to be played from the optimal service node; and downloading the video clip file according to the index file and decoding.
According to the method and the device, the optimal service node is selected according to the connection speed to be used for downloading the video clip to be played, the video clip of the video to be played can be obtained at the highest speed, and the user experience is improved.
In this embodiment, a video synchronous playing method is provided through the above steps S101 to S103, a time difference between a local area and a reference server is determined by obtaining a standard playing time relative to the reference server, a local actual playing time of a video to be played is determined according to the standard playing time of the video to be played and the time difference, and actual playing times relative to the reference server can be determined for different playing terminals through the above steps, so that a basis is provided for different terminals to synchronously play the video; according to the method and the device, the corresponding video clips are obtained from the storage addresses of the videos to be played and played according to the local current time and the local actual playing time, so that the video clips played by different terminals are all the video clips corresponding to the standard playing time of the reference server, and synchronous playing of the different terminals is achieved.
Example two
The present embodiment provides a video synchronous playing method for a terminal, referring to fig. 5, fig. 5 shows a flowchart of the video synchronous playing method provided by the present embodiment, which includes steps S501 to S504.
S501, acquiring standard playing time of the video to be played relative to a reference server.
S502, determining the time difference between the local and the reference server, and determining the local actual playing time of the video to be played according to the standard playing time of the video to be played and the time difference.
S503, acquiring a corresponding video clip from the storage address of the video to be played according to the local current time and the local actual playing time, and playing.
Since the specific contents included in steps S501 to S503 have already been described in detail in the foregoing, detailed description is omitted in this embodiment.
S504, monitoring the playing position of the video to be played in a preset monitoring period in the playing process of the video to be played.
Specifically, in order to ensure that each terminal plays synchronously in the process of playing the video to be played, the terminal monitors the playing position of the video to be played according to a preset monitoring period. The monitoring period may be set according to actual conditions of each terminal, for example, the monitoring period is 10s, 30s, 1min, and the like, which is not limited in the present application.
Further, in the video synchronous playing method provided by the application, the monitoring period is less than or equal to a preset error threshold;
monitoring the playing position of the video to be played in a preset monitoring period in the playing process of the video to be played, and the monitoring method comprises the following steps:
determining an expected playing position of the video to be played at the monitoring point of the monitoring period according to the local actual playing time, and acquiring the current playing position of the video to be played;
and under the condition that the difference value between the expected playing position and the current playing position of the video to be played exceeds the error threshold value, adjusting the playing of the video to be played.
For example, the playing of the terminal a is described as an example, the video to be played is played at a normal playing speed of 60 frames per second, and with a preset check period of 2s and a preset error threshold of 3s, in the process of playing the video to be played, the terminal a determines an expected playing position at a monitoring point according to the local actual playing time every 2s, obtains the current playing position of the terminal at the detection point, compares the expected playing position with the current playing position, and adjusts the playing of the video to be played if a difference between the two positions exceeds the error threshold. For example, if the expected playing position is the 4 th frame of the second video segment, and the current playing position is the 64 th frame of the second video segment, the difference value between the expected playing position and the current playing position is 60 frames, the corresponding time difference value is 1s, and the difference value is within the preset error threshold value of 3s, no adjustment is required; if the expected playing position is the 20 th frame of the second video segment, and the current playing position is the 260 th frame of the second video segment, the difference value between the expected playing position and the current playing position is 240 frames, and the corresponding time difference value is 4s, if the difference value exceeds the preset error threshold value and is 3s, the playing of the video to be played needs to be adjusted.
Further, in the video synchronous playing method provided by the present application, when the difference exceeds the error threshold, adjusting the playing of the video to be played includes:
under the condition that the current playing position of the video to be played is faster than the expected playing position, pausing playing the video to be played or slowing down playing the video to be played;
and under the condition that the current playing position of the video to be played is slower than the expected playing position, acquiring a video clip corresponding to the expected playing position and playing the video clip, or accelerating to play the video to be played.
As shown in fig. 6a, fig. 6a shows a scene schematic diagram of an expected playing position (E point) and a current playing position (C point) corresponding to a monitoring point M1 in a monitoring period in the video synchronous playing method provided by the present application. When the current playing position (point C) corresponding to the monitoring point M1 is faster than the corresponding expected playing position (point E) and the difference between the two exceeds the preset error threshold, the terminal a needs to adjust the playing of the video to be played.
Specifically, if the terminal a plays the video to be played at a playing speed of 60 frames per second, the preset check period is 2s, and the preset error threshold is 3s. The expected playing position is the 20 th frame of the third video segment (P3), the current playing position is the 260 th frame of P3, the difference value between the two is 240 frames, the corresponding time difference value is 4s, the difference value exceeds the preset error threshold value and is 3s, and the current playing position of the video to be played is faster than the expected playing position, and the following two ways can be adopted for adjustment:
(1) Stopping playing at the current playing position, specifically: stopping playing, determining a corresponding first time difference between the current playing position and the expected playing position according to the playing speed, resuming playing after waiting for the first time difference, namely, the terminal A stops playing at the current playing position, and resumes playing after waiting for 4 s;
(2) The speed-down playing of the video to be played specifically comprises the following steps: and calculating a playing error according to the current playing position and the expected playing position, calculating a first playing speed according to the playing error, and carrying out speed reduction playing according to the first playing speed.
In another case, fig. 6b shows a scene schematic diagram of an expected playing position (E point) and a current playing position (C point) corresponding to a monitoring point M2 in a monitoring period in the video synchronous playing method provided by the present application: when the current playing position (point C) corresponding to the monitoring point M2 of the terminal a is slower than the expected playing position (point E) corresponding to the monitoring point M2 and the difference between the two exceeds the preset error threshold, the playing of the video to be played needs to be adjusted.
Specifically, the terminal a plays the video to be played at a normal play speed of 60 frames per second, with a preset check period of 2s and a preset error threshold of 3s. The expected playing position is the 420 th frame of the fifth video segment (P5), the current playing position is the 120 th frame of P5, the difference between the two is 300 frames, the corresponding time difference is 5s, the difference exceeds the preset error threshold value and is 3s, and the current playing position of the video to be played is slower than the expected playing position, the following two ways can be adopted for adjustment:
(1) Acquiring and playing the video clip corresponding to the expected playing position, specifically: the terminal A acquires a video clip corresponding to a 420 th frame of a second video clip at an expected playing position, namely acquires the second video clip and starts to play from the 420 th frame;
(2) The accelerated playing of the video to be played specifically comprises: and calculating a playing error according to the current playing position and the expected playing position, calculating a second playing speed according to the playing error, and carrying out accelerated playing according to the second playing speed.
Specifically, the video to be played may be played in a decelerating or accelerating manner according to a common means in the art, and the decelerating or accelerating manner of playing the video to be played is not particularly limited in the present application.
Further, under the condition that the current playing position of the video to be played is slower than the expected playing position, acquiring a video segment corresponding to the expected playing position, including:
searching whether a video clip corresponding to the expected playing position is included in the downloaded video clips;
if not, stopping the currently downloaded video clip and downloading the video clip corresponding to the expected playing position from the storage address of the video to be played.
According to the foregoing, the terminal starts downloading the video to be played after establishing connection with the optimal service node, so that when the current playing position of the monitoring point in the preset monitoring period is slower than the expected playing position, for example, the current playing position is the 300 th frame of the second video segment, and the expected playing position corresponds to the 350 th frame of the fourth video segment, the terminal first searches whether the fourth video segment has been downloaded in the local already downloaded video segments, and if the terminal does not download the fourth video segment but is downloading the third video segment, the terminal stops downloading the current third video segment, and directly downloads the fourth video segment corresponding to the expected playing position.
Through the operation, the video clip corresponding to the expected playing position can be obtained in time, and the downloading of the video clip which is not needed to be played is cancelled, so that the downloading time and the flow resource are saved, and the occupation of the local storage space of the terminal is reduced.
Further, in the video synchronous playing method provided by the present application, the method further includes:
pre-calculating the expected downloading time of the video clip corresponding to the expected playing position according to the current downloading speed;
and under the condition that the end point of the expected downloading time exceeds the expected playing position, determining an optimal downloaded video clip according to the expected downloading time, and determining an updated expected playing position according to the optimal downloaded video clip.
For example, still taking the aforementioned terminal expected playing position as the 350 th frame of the fourth video segment as an example, before the terminal downloads the fourth video segment, the expected downloading time for downloading the fourth video segment is pre-calculated according to the current downloading speed of the terminal, and it is determined whether the actual playing time corresponding to the 350 th frame of the fourth video segment has exceeded the following ratio according to the expected downloading time, for example, the current time is 9. In this case, the terminal determines the optimal download segment according to the download completion time corresponding to the expected download time being 9; in another case, if the playing position corresponding to the download completion time 9.
According to the method and the device, the optimal download segment can be selected according to the download speed and the corresponding expected play position is determined, the actual play time of the expected play position can be obtained at the moment when the download is completed, the play position corresponding to the actual play time of the video to be played is more accurate, and the terminals can play synchronously.
Further, the video synchronous playing method provided by the present application further includes:
under the condition that the time for monitoring and adjusting the playing position of the video to be played at the monitoring point of the current monitoring period exceeds the monitoring period;
and for the next monitoring period, determining an expected playing position corresponding to the monitoring point of the next monitoring period by adopting a preset control algorithm based on the difference between the monitoring and adjusting time of the current monitoring period and the monitoring period.
Specifically, for example, the preset monitoring period of the terminal is 5s, and since the difference between the current playing position and the expected playing position of the monitoring point in the current monitoring period exceeds the preset error threshold, the terminal adjusts the playing position in the current monitoring period, and when the total time consumed from the starting time of the monitoring action to the end of adjusting the playing position in the current monitoring period is 6s, the preset monitoring period is exceeded by 5s, so the expected playing position of the monitoring point in the next monitoring period is re-determined according to the preset control algorithm based on the error of the time exceeding.
Specifically, the control algorithm in the present application may employ PID (Proportional-Derivative-Integral) control.
Through the steps, in the process of playing the video, if the situation that the playing adjustment behavior is more complex and causes the situation that the playing adjustment behavior exceeds the preset monitoring period occurs, in order to reduce the influence of the subsequent monitoring behavior of the video to be played, the error behavior can be effectively controlled by adopting a control algorithm, and the error of synchronous playing is reduced.
The present application provides a video synchronous playing method through the foregoing steps S501 to S504, where a terminal only sends a time synchronization request to a reference server at a moment of accessing playing, and each terminal monitors a playing position of a video to be played and performs self-adjustment in a playing process, so that it is possible to ensure that each terminal plays synchronously, and the server does not need to adjust playing, which is low in cost, good in stability, and strong in extensibility.
EXAMPLE III
The embodiment provides a video synchronous playing device, which is used for a terminal, and referring to fig. 7, fig. 7 shows a schematic structural diagram of the video synchronous playing device provided by the present application, where the device includes the following modules:
an obtaining module 701 configured to obtain a standard playing time of a video to be played relative to a reference server;
a time module 702 configured to determine a time difference between a local and the reference server, and determine a local actual playing time of the video to be played according to a standard playing time of the video to be played and the time difference;
the playing module 703 is configured to obtain a corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time, and play the video segment.
Optionally, the time module 702 is further configured to:
accessing the reference server and sending a time synchronization request to the reference server;
receiving time synchronization request feedback of the reference server and recording the received local time t4, wherein the time synchronization request feedback comprises the local time t1 when the terminal sends the time synchronization request, the time t2 when the reference server receives the time synchronization request and the time t3 when the reference server sends the time synchronization request feedback;
and determining the time difference between the local and the reference server according to the t1, the t2, the t3 and the t 4.
Optionally, the playing back module 703 is further configured to:
comparing the local current time with the local actual playing time to determine a video clip of the video to be played corresponding to the local current time;
and acquiring the corresponding video clip from the storage address of the video to be played and playing the video clip.
Optionally, the playing back module 703 is further configured to:
comparing the local current time with the starting playing time in the local actual playing time;
under the condition that the local current time is earlier than the starting playing time in the local actual playing time, acquiring a first video segment of the video to be played from the storage address of the video to be played as an initial playing video segment, and playing at the starting playing time in the local actual playing time;
and under the condition that the local current time is later than the local actual playing starting time, determining the video clip of the video to be played corresponding to the local current time, and acquiring the corresponding video clip from the storage address of the video to be played and playing the video clip.
Further, the video synchronous playing device provided by the present application further includes a monitoring module, where the monitoring module is configured to:
and monitoring the playing position of the video to be played in a preset monitoring period in the playing process of the video to be played.
Optionally, in the video synchronous playing device provided by the present application, the monitoring period is less than or equal to a preset error threshold.
Optionally, the monitoring module is further configured to:
determining an expected playing position of the monitoring point of the video to be played in the monitoring period according to the local actual playing time, and acquiring the current playing position of the video to be played;
and under the condition that the difference value between the expected playing position and the current playing position of the video to be played exceeds the error threshold value, adjusting the playing of the video to be played.
Optionally, the monitoring module is further configured to:
under the condition that the current playing position of the video to be played is faster than the expected playing position, the video to be played is paused to be played or decelerated to be played;
and under the condition that the current playing position of the video to be played is slower than the expected playing position, acquiring a video clip corresponding to the expected playing position and playing or accelerating the video to be played to play the video to be played.
Optionally, the monitoring module is further configured to:
searching whether a video clip corresponding to the expected playing position is included in the downloaded video clips;
if not, stopping the currently downloaded video clip and downloading the video clip corresponding to the expected playing position from the storage address of the video to be played.
Specifically, the video to be played is stored in a plurality of service nodes in a fragment form in a distributed manner, and the video to be played includes an index file and a video clip file.
Optionally, the monitoring module is further configured to:
under the condition that the time for monitoring and adjusting the playing position of the video to be played at the monitoring point of the current monitoring period exceeds the monitoring period;
and for the next monitoring period, determining an expected playing position corresponding to the monitoring point of the next monitoring period by adopting a preset control algorithm based on the difference between the monitoring and adjusting time of the current monitoring period and the monitoring period.
Optionally, the monitoring module is further configured to:
pre-calculating the expected downloading time of the video clip corresponding to the expected playing position according to the current downloading speed;
and under the condition that the end point of the expected downloading time exceeds the actual playing time corresponding to the expected playing position, determining the optimal downloaded video clip according to the expected downloading time and determining the updated expected playing position.
Further, the video synchronous playing device provided by the present application further includes a downloading module, where the downloading module is configured to:
determining an optimal service node in the plurality of service nodes based on the connection speed, and downloading the index file of the video to be played from the optimal service node; and downloading the video clip file according to the index file and decoding.
The application provides a video synchronous playing device, which determines the time difference between a local part and a reference server by acquiring the standard playing time relative to the reference server, determines the local actual playing time of a video to be played according to the standard playing time of the video to be played and the time difference, can determine the actual playing time relative to the reference server for different playing terminals through the steps, and provides a basis for realizing synchronous playing of the video by different terminals; according to the method and the device, the corresponding video clips are obtained from the storage addresses of the videos to be played and played according to the local current time and the local actual playing time, the video clips played by different terminals are all the video clips corresponding to the standard playing time of the reference server, and therefore synchronous playing of multiple terminals is achieved.
The above is a schematic scheme of a video synchronous playing device of this embodiment. It should be noted that the technical solution of the apparatus and the technical solution of the method of the video synchronized playing apparatus belong to the same concept, and details of the technical solution of the video synchronized playing apparatus, which are not described in detail, can be referred to the description of the technical solution of the video synchronized playing method. The specific content included in the video synchronous playing method is provided in the foregoing embodiment, and is not described herein again.
Example four
The present embodiment provides a computing device 800, shown in FIG. 8.
FIG. 8 is a block diagram illustrating a configuration of a computing device 800 according to an embodiment of the present description. The components of the computing device 800 include, but are not limited to, a memory 810 and a processor 820. The processor 820 is coupled to the memory 810 via a bus 830, and the database 850 is used to store data.
Computing device 800 also includes access device 840, access device 840 enabling computing device 800 to communicate via one or more networks 860. Examples of such networks include the Public Switched Telephone Network (PSTN), a Local Area Network (LAN), a Wide Area Network (WAN), a Personal Area Network (PAN), or a combination of communication networks such as the internet. Access device 840 may include one or more of any type of network interface (e.g., a Network Interface Card (NIC)) whether wired or wireless, such as an IEEE802.11 Wireless Local Area Network (WLAN) wireless interface, a worldwide interoperability for microwave access (Wi-MAX) interface, an ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a bluetooth interface, a Near Field Communication (NFC) interface, and so forth.
In one embodiment of the present description, the above-described components of computing device 800, as well as other components not shown in FIG. 8, may also be connected to each other, such as by a bus. It should be understood that the block diagram of the computing device structure shown in FIG. 8 is for purposes of example only and is not limiting as to the scope of the description. Those skilled in the art may add or replace other components as desired.
Computing device 800 may be any type of stationary or mobile computing device, including a mobile computer or mobile computing device (e.g., tablet, personal digital assistant, laptop, notebook, netbook, etc.), a mobile phone (e.g., smartphone), a wearable computing device (e.g., smartwatch, smartglasses, etc.), or other type of mobile device, or a stationary computing device such as a desktop computer or PC. Computing device 800 may also be a mobile or stationary server.
The processor 820 may perform the steps in the video synchronous playing method provided in the foregoing embodiments. The specific steps are not described in detail in this embodiment.
An embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions, and when the instructions are executed by a processor, the computer-readable storage medium implements the steps in the video synchronous playing method as described above.
The above is an illustrative scheme of a computer-readable storage medium of the present embodiment. It should be noted that the technical solution of the storage medium and the technical solution of the video synchronous playing method belong to the same concept, and details that are not described in detail in the technical solution of the storage medium can be referred to the description of the technical solution of the video synchronous playing method.
The computer instructions comprise computer program code which may be in the form of source code, object code, an executable file or some intermediate form, or the like. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, and software distribution medium, etc. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media may not include electrical carrier signals or telecommunication signals in accordance with legislation and patent practice.
It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art will appreciate that the embodiments described in this specification are presently considered to be preferred embodiments and that acts and modules are not required in the present application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The preferred embodiments of the present application disclosed above are intended only to aid in the explanation of the application. Alternative embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and the practical application, to thereby enable others skilled in the art to best understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.
Claims (12)
1. A video synchronous playing method is characterized in that the method is used for a terminal and comprises the following steps:
acquiring standard playing time of a video to be played relative to a reference server;
determining the time difference between the local and the reference server, and determining the local actual playing time of the video to be played according to the standard playing time of the video to be played and the time difference;
acquiring a corresponding video clip from the storage address of the video to be played according to the local current time and the local actual playing time, and playing the video clip;
monitoring the playing position of the video to be played in a preset monitoring period in the playing process of the video to be played;
under the condition that the time for monitoring and adjusting the playing position of the video to be played at the monitoring point of the current monitoring period exceeds the monitoring period; and determining an expected playing position corresponding to the monitoring point in the next monitoring period by adopting a preset control algorithm based on the difference value between the monitoring and adjusting time of the current monitoring period and the monitoring period, wherein the control algorithm is a PID control algorithm.
2. The method for synchronously playing the video according to claim 1, wherein the step of obtaining the corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time and playing the video segment comprises:
comparing the local current time with the local actual playing time to determine a video clip of the video to be played corresponding to the local current time;
and acquiring the corresponding video clip from the storage address of the video to be played and playing the video clip.
3. The method for synchronously playing the video according to claim 1, wherein the step of obtaining the corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time and playing the video segment comprises:
comparing the local current time with the starting playing time in the local actual playing time;
under the condition that the local current time is earlier than the playing starting time, acquiring a first video clip of the video to be played from the storage address of the video to be played as an initial playing video clip and playing at the playing starting time in the local actual playing time;
and under the condition that the local current time is later than the playing starting time, determining the video clip of the video to be played corresponding to the local current time, and acquiring the corresponding video clip from the storage address of the video to be played and playing the video clip.
4. The video synchronous playing method according to claim 1, wherein the monitoring period is less than or equal to a preset error threshold;
monitoring the playing position of the video to be played in a preset monitoring period in the playing process of the video to be played, and the method comprises the following steps:
determining an expected playing position of the monitoring point of the video to be played in the monitoring period according to the local actual playing time, and acquiring the current playing position of the video to be played;
and under the condition that the difference value between the expected playing position and the current playing position of the video to be played exceeds the error threshold value, adjusting the playing of the video to be played.
5. The method of claim 4, wherein adjusting the playing of the video to be played when the difference exceeds the error threshold comprises:
under the condition that the current playing position of the video to be played is faster than the expected playing position, pausing playing the video to be played or slowing down playing the video to be played;
and under the condition that the current playing position of the video to be played is slower than the expected playing position, acquiring a video clip corresponding to the expected playing position and playing the video clip, or playing the video to be played in an accelerated way.
6. The method for playing video synchronously according to claim 5, wherein obtaining the video segment corresponding to the expected playing position comprises:
searching whether a video clip corresponding to the expected playing position is included in the downloaded video clips;
if not, stopping the currently downloaded video clip and downloading the video clip corresponding to the expected playing position from the storage address of the video to be played.
7. The method for synchronously playing video according to claim 1, wherein the video to be played is stored in a plurality of service nodes in a fragment form in a distributed manner, and comprises an index file and a video clip file;
the video synchronous playing method further comprises the following steps:
determining an optimal service node in the plurality of service nodes based on the connection speed, and downloading the index file of the video to be played from the optimal service node; and downloading the video clip file according to the index file and decoding.
8. The method for playing video synchronously as claimed in claim 1, wherein determining the time difference between the local and the reference server comprises:
accessing the reference server and sending a time synchronization request to the reference server;
receiving time synchronization request feedback of the reference server and recording received local time t4, wherein the time synchronization request feedback comprises local time t1 when the terminal sends a time synchronization request, time t2 when the reference server receives the time synchronization request and time t3 when the reference server issues the time synchronization request feedback;
and determining the time difference between the local and the reference server according to the t1, the t2, the t3 and the t 4.
9. The video synchronized playback method of claim 6, further comprising:
pre-calculating the expected downloading time of the video clip corresponding to the expected playing position according to the current downloading speed;
and under the condition that the end point of the expected downloading time exceeds the actual playing time corresponding to the expected playing position, determining the optimal downloaded video clip according to the expected downloading time and determining the updated expected playing position.
10. A video synchronous playing device is used for a terminal and comprises:
the acquisition module is configured to acquire standard playing time of a video to be played relative to a reference server;
the time module is configured to determine a time difference between a local area and the reference server, and determine a local actual playing time of the video to be played according to a standard playing time of the video to be played and the time difference;
the playing module is configured to acquire a corresponding video segment from the storage address of the video to be played according to the local current time and the local actual playing time and play the video segment;
the monitoring module is configured to monitor the playing position of the video to be played in a preset monitoring period in the playing process of the video to be played, and the time for monitoring and adjusting the playing position of the video to be played at the monitoring point of the current monitoring period exceeds the monitoring period; and determining an expected playing position corresponding to the monitoring point in the next monitoring period by adopting a preset control algorithm based on the difference value between the monitoring and adjusting time of the current monitoring period and the monitoring period, wherein the control algorithm is a PID control algorithm.
11. A computing device, comprising:
a memory and a processor;
the memory is configured to store computer-executable instructions, and the processor is configured to execute the computer-executable instructions to implement the method of:
the steps of the video synchronized playback method of any of claims 1-9.
12. A computer readable storage medium storing computer instructions which, when executed by a processor, implement the steps of the video synchronized playback method of any of claims 1-9.
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