WO2020133109A1 - 视频同步方法、服务器端视频同步装置、客户端视频同步装置 - Google Patents
视频同步方法、服务器端视频同步装置、客户端视频同步装置 Download PDFInfo
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- WO2020133109A1 WO2020133109A1 PCT/CN2018/124491 CN2018124491W WO2020133109A1 WO 2020133109 A1 WO2020133109 A1 WO 2020133109A1 CN 2018124491 W CN2018124491 W CN 2018124491W WO 2020133109 A1 WO2020133109 A1 WO 2020133109A1
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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
Definitions
- the invention relates to the field of video synchronization playback, and more specifically, to a video synchronization method, a server-side video synchronization device, and a client-side video synchronization device.
- the multi-screen synchronous playback system based on the local area network has a wide range of applications. In the process of synchronous playback on multiple screens, it is essential to maintain video synchronization.
- the synchronization method used in the prior art is that the video server sends a synchronous broadcast at a certain time interval, and the client searches for the time of the video server after receiving the broadcast to complete the synchronization.
- the problem of the existing multi-screen synchronous video playback solution in the local area network the player needs a certain time to search at any point in time, and there are key frame jumps in the video source such as mp4 files, etc., the player can only find the key frame first, and then Jump to the search time point when rendering, this time point is longer, and the time is uncertain.
- the technical problem to be solved is to provide a video synchronization method, a server-side video synchronization device, and a client-side video synchronization device in view of the above-mentioned defects of the prior art.
- the technical solution adopted to solve the technical problem is to construct a video synchronization method, which is applied to the server side.
- the method includes:
- a video synchronization method is also provided, which is applied to the client.
- the method includes:
- Receive video synchronization broadcast includes key frame information
- the client and the terminal sending the video synchronous broadcast are not in the same frame, they are synchronized to the key frame.
- a server-side video synchronization device includes:
- the first parsing unit is used to parse key frames in the video
- the first sending unit is configured to generate a video synchronization broadcast and send the video synchronization broadcast at a predetermined number of video frames before the key frame.
- a client video synchronization device includes:
- a first receiving unit configured to receive a video synchronization broadcast, the video synchronization broadcast including key frame information
- the first judgment unit is used to determine whether the client and the server that sends the video synchronization broadcast are in the same frame based on the video synchronization broadcast;
- the first synchronization unit is configured to synchronize to the key frame if the client and the terminal sending the video synchronization broadcast are not in the same frame.
- the client in the process of synchronous video playback, by analyzing key frames of the video, the client can receive the synchronous broadcast of the video at the position of the key frame to solve the problems of inaccurate search and synchronization delay of the player.
- FIG. 1 is a flowchart of a video synchronization method applied to a server side provided by an embodiment of the present invention
- FIG. 2 is a flowchart of a video synchronization method applied to a client according to an embodiment of the present invention
- FIG. 3 is a flowchart of a video synchronization method applied to a client provided by an embodiment of the present invention
- FIG. 4 is a structural diagram of a server-side video synchronization device provided by an embodiment of the present invention.
- FIG. 5 is a structural diagram of a client video synchronization device provided by an embodiment of the present invention.
- FIG. 6 is a structural diagram of a client video synchronization device according to an embodiment of the present invention.
- the video synchronization method of this embodiment is applied to a server side, which is located in a multi-screen video synchronization playback system.
- the system includes a server side and multiple clients.
- the server side is connected to each through a network.
- the server and the client are in the same local area network, and any one of the video devices is selected as the server, and the remaining video devices in the local area network are used as the client.
- the video synchronization method includes:
- the video includes key frames and non-key frames.
- the key frame information is obtained by parsing the key frames in the video.
- the key frame information includes key frame position information and key frame time information.
- the video synchronization broadcast includes at least one of a key frame sequence number, a server time stamp, and a server player time point.
- the predetermined number of video frames is satisfied, and the time period from the reception of the video synchronization broadcast to the completion of the video synchronization by the client receiving the video synchronization broadcast is equal to the playback time length of the predetermined number of video frames.
- the server sends the video synchronization broadcast before the key frame, so as to give the client a certain time to call the Seek command to synchronize to the key frame, to ensure that the server and the client complete synchronization.
- the method before parsing the key frames in the video, the method further includes: detecting a video jump instruction; when a video jump instruction is detected, executing the key frame instruction in the video.
- Sending the video synchronization broadcast at a predetermined number of video frames before the key frame includes sending the video synchronization broadcast at a predetermined number of video frames before the first key frame after the video frame where the video jump instruction is detected.
- the video jump instruction is a jump instruction generated by the user adjusting the video progress bar.
- the video synchronization method involved in this application is not limited to the application environment where the video jump instruction is received, and may also include periodic detection. Whether the server and the client are synchronized to preset regular synchronization instructions, etc.
- the non-key frame is not the original video of the video, but is derived from the calculation of several key frames and non-key frames before the non-key frame, so it cannot be directly synchronized to the non-key frame, that is, the server and the client cannot jump at the same time. Go to this non-key frame.
- analyzing the key frames in the video includes: parsing the first key frame after the jump video frame differs from the jump video frame by more than the number of video frames corresponding to the time to complete the video synchronization.
- the jump video frame here includes the video frame where the server side is located after receiving the video jump instruction or receiving the synchronization instruction (including periodic synchronization, based on the user's instruction) (the video frame may be (Key frames may also be non-key frames).
- this embodiment further includes: generating a clock synchronization broadcast and sending the clock synchronization broadcast, that is, the server sends the clock synchronization broadcast to all clients.
- the server side obtains the video key frame time, and sends a video synchronization broadcast at the key frame position to achieve synchronization between the server side and the client.
- a server side includes a processor, a memory storing a computer readable program, and the computer readable program is implemented when the processor executes:
- the video includes key frames and non-key frames.
- the key frame information is obtained by parsing the key frames in the video.
- the key frame information includes key frame position information and key frame time information.
- the video synchronization broadcast includes at least one of a key frame sequence number, a server time stamp, and a server player time point.
- the predetermined number of video frames is satisfied, and the time period from the reception of the video synchronization broadcast to the completion of the video synchronization by the client receiving the video synchronization broadcast is equal to the playback time length of the predetermined number of video frames.
- the server sends the video synchronization broadcast before the key frame, so as to give the client a certain time to call the Seek command to synchronize to the key frame, to ensure that the server and the client complete synchronization.
- the method before parsing the key frames in the video, the method further includes: detecting a video jump instruction; when a video jump instruction is detected, executing the key frame instruction in the video.
- Sending the video synchronization broadcast at a predetermined number of video frames before the key frame includes sending the video synchronization broadcast at a predetermined number of video frames before the first key frame after the video frame where the video jump instruction is detected.
- the video jump instruction is a jump instruction generated by the user adjusting the video progress bar.
- the video synchronization method involved in this application is not limited to the application environment where the video jump instruction is received, and may also include periodic detection. Whether the server and the client are synchronized to preset regular synchronization instructions, etc.
- the non-key frame is not the original video of the video, but is derived from the calculation of several key frames and non-key frames before the non-key frame, so it cannot be directly synchronized to the non-key frame, that is, the server and the client cannot jump at the same time. Go to this non-key frame.
- analyzing the key frames in the video includes: parsing the first key frame after the jump video frame differs from the jump video frame by more than the number of video frames corresponding to the time to complete the video synchronization.
- the jump video frame here includes the video frame where the server side is located after receiving the video jump instruction or receiving the synchronization instruction (including periodic synchronization, based on the user's instruction) (the video frame may be (Key frames may also be non-key frames).
- this embodiment further includes: generating a clock synchronization broadcast and sending the clock synchronization broadcast, that is, the server sends the clock synchronization broadcast to all clients.
- a storage medium which is executed by the processor to implement the above-mentioned video synchronization method.
- the storage medium is a non-transitory storage medium.
- the video synchronization method of this embodiment is applied to a client.
- the client is located in a multi-screen video synchronization playback system.
- the system includes a server and multiple clients.
- the server is connected to each through a network.
- the server and the client are in the same local area network, and any one of the video devices is selected as the server, and the remaining video devices in the local area network are used as the client.
- the video synchronization method includes:
- S20 Receive synchronous video broadcast, which includes key frame information.
- the client receives the video synchronization broadcast broadcast by the server.
- the key frame information includes key frame position information and key frame time information.
- determining whether the client and the server that sends the video synchronization broadcast are in the same frame includes: determining the playback delay between the client and the server, and if the playback delay is less than the length corresponding to one frame, the client and the sending video synchronization broadcast are determined The server side is located in the same frame; otherwise, it is judged that the client and the server side that sends the video synchronization broadcast are located in different frames.
- the frame time is 33.33 milliseconds; if the playback delay between the client and the server is less than 33.33 milliseconds, it is determined that the client and the server that sends the video synchronization broadcast are in the same frame; if the client The playback delay between the client and the server is greater than or equal to 33.33 milliseconds, and it is determined that the client and the server that send the video synchronization broadcast are in different frames.
- Synchronizing to key frames includes: calling the Seek command to synchronize to key frames.
- the client determines whether the client and the server that sends the video synchronous broadcast are in the same frame through key frame information in the video synchronous broadcast, so that the server and the client complete synchronization.
- the video synchronization method of this embodiment further includes:
- S201 Receive a clock synchronization broadcast, and determine whether the client and the server that sends the clock synchronization broadcast are clock synchronized;
- the clock synchronization step is performed. Further, the steps of performing clock synchronization include:
- S2012 Receive the corresponding time synchronization request instruction returned by the server; after the server receives the time synchronization request instruction, add the current time of the server to the time synchronization request instruction, and then return to the client.
- step S2013 Determine whether the round-trip time is less than a preset threshold time, where the round-trip time is determined by the sending time and the receiving time of the time synchronization request instruction; if the round-trip time is less than the preset threshold time, time synchronization is completed. If the round trip time is not less than the preset threshold time, step S2011 is performed: a time synchronization request instruction is sent after receiving the time synchronization instruction.
- the preset threshold time is determined according to the server, client, and network attributes used, for example, the preset threshold time is 20 milliseconds.
- the time synchronization function between the client and the server is firstly added, thereby solving the problem of delay in sending instructions between the client and the server; secondly, by obtaining the video key frame time, the video synchronization broadcast is sent at the key frame position to realize the server and The client completes synchronization.
- a client in another embodiment, includes a processor and a memory storing a computer-readable program.
- the computer-readable program is implemented when the processor executes:
- S20 Receive synchronous video broadcast, which includes key frame information.
- the client receives the video synchronization broadcast broadcast by the server.
- the key frame information includes key frame position information and key frame time information.
- determining whether the client and the server that sends the video synchronization broadcast are in the same frame includes: determining the playback delay between the client and the server, and if the playback delay is less than the length corresponding to one frame, the client and the sending video synchronization broadcast are determined The server side is located in the same frame; otherwise, it is judged that the client and the server side that sends the video synchronization broadcast are located in different frames.
- the frame time is 33.33 milliseconds; if the playback delay between the client and the server is less than 33.33 milliseconds, it is determined that the client and the server that sends the video synchronization broadcast are in the same frame; if the client The playback delay between the client and the server is greater than or equal to 33.33 milliseconds, and it is determined that the client and the server that send the video synchronization broadcast are in different frames.
- Synchronizing to key frames includes: calling the Seek command to synchronize to key frames.
- S201 Receive a clock synchronization broadcast, and determine whether the client and the server that sends the clock synchronization broadcast are clock synchronized;
- the clock synchronization step is performed. Further, the steps of performing clock synchronization include:
- S2012 Receive the corresponding time synchronization request instruction returned by the server; after the server receives the time synchronization request instruction, add the current time of the server to the time synchronization request instruction, and then return to the client.
- step S2013 Determine whether the round-trip time is less than a preset threshold time, where the round-trip time is determined by the sending time and the receiving time of the time synchronization request instruction; if the round-trip time is less than the preset threshold time, time synchronization is completed. If the round trip time is not less than the preset threshold time, step S2011 is performed: a time synchronization request instruction is sent after receiving the time synchronization instruction.
- the preset threshold time is determined according to the server, client, and network attributes used, for example, the preset threshold time is 20 milliseconds.
- the time synchronization function between the client and the server is firstly added, thereby solving the problem of delay in sending instructions between the client and the server; secondly, by obtaining the video key frame time, the video synchronization broadcast is sent at the key frame position to realize the server and The client completes synchronization.
- a storage medium which is executed by the processor to implement the above-mentioned video synchronization method.
- the storage medium is a non-transitory storage medium.
- the server-side video synchronization device of this embodiment is applied to a server-side.
- the server-side is located in a multi-screen video synchronization playback system.
- the system includes a server-side and multiple clients. Connect each client.
- the server and the client are in the same local area network, and any one of the video devices is selected as the server, and the remaining video devices in the local area network are used as the client.
- the server-side video synchronization device includes:
- the first parsing unit 40 is used to parse key frames in the video.
- the video includes key frames and non-key frames.
- the key frame information is obtained by parsing the key frames in the video.
- the key frame information includes key frame position information and key frame time information.
- the first sending unit 41 is configured to generate a video synchronization broadcast and send the video synchronization broadcast at a predetermined number of video frames before the key frame.
- the video synchronization broadcast includes at least one of a key frame sequence number, a server time stamp, and a server player time point.
- the predetermined number of video frames is satisfied, and the time period from the reception of the video synchronization broadcast to the completion of the video synchronization by the client receiving the video synchronization broadcast is equal to the playback time length of the predetermined number of video frames.
- the server sends the video synchronization broadcast before the key frame, so as to give the client a certain time to call the Seek command to synchronize to the key frame, to ensure that the server and the client complete synchronization.
- server-side video synchronization device of this embodiment further includes:
- the first detection unit is used to detect video jump instructions
- the second parsing unit is used to execute a key frame instruction in parsing the video when a video jump instruction is detected.
- the second sending unit is configured to send the video synchronization broadcast at a predetermined number of video frames before the first key frame after the video frame where the video jump instruction is detected.
- the server-side video synchronization apparatus of this embodiment further includes: a third sending unit, configured to generate a clock synchronization broadcast and send the clock synchronization broadcast, that is, the server side sends the clock synchronization broadcast to all clients.
- a third sending unit configured to generate a clock synchronization broadcast and send the clock synchronization broadcast, that is, the server side sends the clock synchronization broadcast to all clients.
- the server side obtains the video key frame time, and sends a video synchronization broadcast at the key frame position to achieve synchronization between the server side and the client.
- the client video synchronization device of this embodiment is applied to a client.
- the client is located in a multi-screen video synchronization playback system.
- the system includes a server and multiple clients. Connect each client.
- the server and the client are in the same local area network, and any one of the video devices is selected as the server, and the remaining video devices in the local area network are used as the client.
- the client video synchronization device includes:
- the first receiving unit 50 is configured to receive video synchronization broadcast, and the video synchronization broadcast includes key frame information.
- the client receives the video synchronization broadcast broadcast by the server.
- the key frame information includes key frame position information and key frame time information.
- the first judgment unit 51 is used to determine whether the client and the server that sends the video synchronization broadcast are in the same frame based on the video synchronization broadcast.
- the first judging unit 51 includes a second judging unit: used to determine the delay between the client and the server. If the delay is less than the length corresponding to one frame, the client and the server that sends the synchronous broadcast of video are in the same frame. ; Otherwise, it is determined that the client and the server that sends the video synchronous broadcast are in different frames.
- the frame time is 33.33 milliseconds; if the time delay between the client and the server is less than 33.33 milliseconds, it is determined that the client and the server that send the video synchronization broadcast are in the same frame; if the client The delay between the server and the server is greater than or equal to 33.33 milliseconds, and it is determined that the client and the server that send the video synchronization broadcast are in different frames.
- the first synchronization unit 52 is used to synchronize to a key frame if the client and the terminal sending the video synchronization broadcast are not in the same frame.
- the client video synchronization device of this embodiment further includes: a second synchronization unit, configured to call the Seek instruction to synchronize to a key frame.
- the client determines whether the client and the server that sends the video synchronous broadcast are in the same frame through key frame information in the video synchronous broadcast, so that the server and the client complete synchronization.
- the client video synchronization apparatus of this embodiment further includes:
- the second receiving unit 501 is used to receive the clock synchronization broadcast and determine whether the client and the server that sends the clock synchronization broadcast are clock synchronized;
- the third synchronization unit is used to perform synchronization of receiving video broadcast when the clock is synchronized;
- the fourth synchronization unit is used to perform the clock synchronization step when the clock is not synchronized.
- the fourth sending unit 5011 is configured to send a time synchronization request instruction after receiving the time synchronization instruction; wherein the time synchronization request instruction includes the current time stamp of the client and the client serial number.
- the third receiving unit 5012 is configured to receive the corresponding time synchronization request instruction returned by the server; after the server receives the time synchronization request instruction, add the current time of the server to the time synchronization request instruction, and then return to the client.
- the third determining unit 5013 is configured to determine whether the round-trip time is less than a preset threshold time, where the round-trip time is determined by the sending time and receiving time of the time synchronization request instruction; if so, time synchronization is completed. If the round trip time is not less than the preset threshold time, step S2011 is performed: a time synchronization request instruction is sent after receiving the time synchronization instruction.
- the preset threshold time is determined according to the server, client, and network attributes used, for example, the preset threshold time is 20 milliseconds.
- the time synchronization function between the client and the server is firstly added, thereby solving the problem of delay in sending instructions between the client and the server; secondly, by obtaining the video key frame time, the video synchronization broadcast is sent at the key frame position to realize the server and The client completes synchronization.
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Abstract
视频同步方法、服务器端视频同步装置、客户端视频同步装置。服务器端的视频同步方法包括:解析视频中的关键帧;生成视频同步广播,并在关键帧前预定数量的视频帧处发送视频同步广播。客户端的视频同步方法包括:接收视频同步广播,视频同步广播包括关键帧信息;基于视频同步广播,确定客户端与发送视频同步广播的服务器端是否位于同一帧;若客户端与发送视频同步广播的终端不位于同一帧,则同步至关键帧。首先,增加客户端和服务器的对时功能,从而解决客户端和服务器之间指令发送时延问题;其次,通过得到视频关键帧时间,在关键帧位置发送视频同步广播,解决播放器查找不准确、同步延迟等问题,实现同步播放。
Description
本发明涉及视频同步播放领域,更具体地说,涉及一种视频同步方法、服务器端视频同步装置、客户端视频同步装置。
基于局域网的多屏同步播放系统具有广泛应用,在多屏进行同步播放过程中,保持视频同步至关重要。现有技术中采用的同步方式是:视频服务器采用一定时间间隔发送同步广播,客户端在接到广播后查找视频服务器所在的时间,完成同步。现有局域网内多屏同步播放视频方案的问题:播放器在任意时间点进行查找需要一定时间,并且视频源比如mp4文件等还存在关键帧跳转,播放器只能先查找到关键帧,然后在渲染的时候跳转到查找时间点,这个时间点较长,且时间不确定。
要解决的技术问题在于,针对现有技术的上述缺陷,提供一种视频同步方法、服务器端视频同步装置、客户端视频同步装置。
解决其技术问题所采用的技术方案是:构造一种视频同步方法,应用于服务器端,所述方法包括:
解析视频中的关键帧;
生成视频同步广播,并在所述关键帧前预定数量的视频帧处发送视频同步广播。
另,还提供一种视频同步方法,应用于客户端,所述方法包括:
接收视频同步广播,所述视频同步广播包括关键帧信息;
基于所述视频同步广播,确定所述客户端与发送所述视频同步广播的服务器端是否位于同一帧;
若所述客户端与发送所述视频同步广播的终端不位于同一帧,则同步至所述关键帧。
另,还提供一种服务器端视频同步装置,所述装置包括:
第一解析单元,用于解析视频中的关键帧;
第一发送单元,用于生成视频同步广播,并在所述关键帧前预定数量的视频帧处发送视频同步广播。
另,还提供一种客户端视频同步装置,所述装置包括:
第一接收单元,用于接收视频同步广播,所述视频同步广播包括关键帧信息;
第一判断单元,用于基于所述视频同步广播,确定所述客户端与发送所述视频同步广播的服务器端是否位于同一帧;
第一同步单元,用于若所述客户端与发送所述视频同步广播的终端不位于同一帧,则同步至所述关键帧。
综上,在视频同步播放过程中,通过解析视频关键帧,使得客户端在关键帧位置接收视频同步广播,解决播放器查找不准确、同步延迟等问题。
下面将结合附图及实施例对本发明作进一步说明,附图中:
图1是本发明一实施例提供的应用于服务器端的视频同步方法流程图;
图2是本发明一实施例提供的应用于客户端的视频同步方法流程图;
图3是本发明一实施例提供的应用于客户端的视频同步方法流程图;
图4是本发明一实施例提供的服务器端视频同步装置结构图;
图5是本发明一实施例提供的客户端视频同步装置结构图;
图6是本发明一实施例提供的客户端视频同步装置结构图。
为了对本发明的技术特征、目的和效果有更加清楚的理解,现对照附图详细说明本发明的具体实施方式。
如图1所示,本实施例的视频同步方法应用于服务器端,该服务器端位于多屏视频同步播放系统中,该系统包括一台服务器端和多台客户端,服务器端通过网络分别连接各个客户端。服务器端和客户端位于同一局域网中,选择其中任意一台视频设备作为服务器端,局域网中剩余视频设备作为客户端。进一步,该视频同步方法包括:
S10、解析视频中的关键帧。视频中包括关键帧和非关键帧,通过解析视频中的关键帧得到关键帧信息,关键帧信息包括关键帧的位置信息和关键帧时间信息等。
S11、生成视频同步广播,并在关键帧前预定数量的视频帧处发送视频同步广播。其中视频同步广播包括关键帧序列号、服务器端时间戳、服务器播放器时间点中的至少一项。预定数量的视频帧满足,接收到视频同步广播的客户端从接收到视频同步广播起至完成视频同步的时间长度等于预定数量的视频帧的播放时间长度。服务器端在关键帧前发送视频同步广播,从而给客户端一定的时间调用Seek指令同步至关键帧,保证服务器端和客户端完成同步。
作为选择,本实施例在解析视频中的关键帧之前还包括:检测视频跳转指令;当检测到视频跳转指令时,执行解析视频中的关键帧指令。在关键帧前预定数量的视频帧处发送视频同步广播包括:在检测到视频跳转指令的视频帧后的第一个关键帧前预定数量的视频帧处发送视频同步广播。
在一非限制性示例中,视频跳转指令是由用户调节视频进度条而生成的跳转指令,然而本申请涉及的视频同步方法不仅限于接收到视频跳转指令应用环境,还可以包括定期检测服务器端和客户端是否同步的预设定期同步指令等。具体地,当用户将视频进度条调节至关键帧A与关键帧B(关键帧B位于关键帧A之后)之间的非关键帧C(即中间帧或过渡帧),由于在一些实施例中,非关键帧并非视频原画,而是由该非关键帧之前的若干个关键帧及非关键帧计算推演得出,因此无法直接同步至该非关键帧,即无法使服务器端和客户端同时跳转至该非关键帧。在这种情况下,假设完成视频同步的时间对应的视频帧数为X,并且非关键帧C与关键帧B的帧数差为X`。如果X`≥X,则上文所指的“解析视频中的关键帧”,即是解析出关键帧B;如果X`<X,则上文所指的“解析视频中的关键帧”,即是解析出关键帧B之后的第一个关键帧B`。总之,“解析视频中的关键帧”包括:解析出跳转视频帧后的第一个与该跳转视频帧相差大于完成视频同步的时间对应的视频帧数的关键帧。此处的跳转视频帧包括接收到视频跳转指令后或接到到同步指令(包括定期同步,基于用户指示下的同步指令)时,所述服务器端所在的视频帧(该视频帧可能是关键帧,也可能是非关键帧)。
如上实施例中,通过解析关键帧信息,有利于客户端迅速SEEK到关键帧;相对于传统地直接解析至当前视频帧,不需要先SEEK到关键帧,然后再根据当前视频帧与关键帧的帧数差再SEEK到该当前视频帧,从而同步效率得到提高。其次,通过预设出预定数量的视频帧,解决了完成同步需要一定时长,导致同步操作本身导致的同步时延问题,进一步提高了同步的正确性。
作为选择,本实施例在解析视频中的关键帧之前还包括:生成时钟同步广播并发送时钟同步广播,即服务器端发送时钟同步广播至所有的客户端。
本实施例中服务器端通过得到视频关键帧时间,在关键帧位置发送视频同步广播,实现服务器端和客户端完成同步。
另一实施例中,还提供有一服务器端,所述服务器端包括处理器,存储有计算机可读程序的存储器,该计算机可读程序被该处理器执行时实现:
S10、解析视频中的关键帧。视频中包括关键帧和非关键帧,通过解析视频中的关键帧得到关键帧信息,关键帧信息包括关键帧的位置信息和关键帧时间信息等。
S11、生成视频同步广播,并在关键帧前预定数量的视频帧处发送视频同步广播。其中视频同步广播包括关键帧序列号、服务器端时间戳、服务器播放器时间点中的至少一项。预定数量的视频帧满足,接收到视频同步广播的客户端从接收到视频同步广播起至完成视频同步的时间长度等于预定数量的视频帧的播放时间长度。服务器端在关键帧前发送视频同步广播,从而给客户端一定的时间调用Seek指令同步至关键帧,保证服务器端和客户端完成同步。
作为选择,本实施例在解析视频中的关键帧之前还包括:检测视频跳转指令;当检测到视频跳转指令时,执行解析视频中的关键帧指令。在关键帧前预定数量的视频帧处发送视频同步广播包括:在检测到视频跳转指令的视频帧后的第一个关键帧前预定数量的视频帧处发送视频同步广播。
在一非限制性示例中,视频跳转指令是由用户调节视频进度条而生成的跳转指令,然而本申请涉及的视频同步方法不仅限于接收到视频跳转指令应用环境,还可以包括定期检测服务器端和客户端是否同步的预设定期同步指令等。具体地,当用户将视频进度条调节至关键帧A与关键帧B(关键帧B位于关键帧A之后)之间的非关键帧C(即中间帧或过渡帧),由于在一些实施例中,非关键帧并非视频原画,而是由该非关键帧之前的若干个关键帧及非关键帧计算推演得出,因此无法直接同步至该非关键帧,即无法使服务器端和客户端同时跳转至该非关键帧。在这种情况下,假设完成视频同步的时间对应的视频帧数为X,并且非关键帧C与关键帧B的帧数差为X`。如果X`≥X,则上文所指的“解析视频中的关键帧”,即是解析出关键帧B;如果X`<X,则上文所指的“解析视频中的关键帧”,即是解析出关键帧B之后的第一个关键帧B`。总之,“解析视频中的关键帧”包括:解析出跳转视频帧后的第一个与该跳转视频帧相差大于完成视频同步的时间对应的视频帧数的关键帧。此处的跳转视频帧包括接收到视频跳转指令后或接到到同步指令(包括定期同步,基于用户指示下的同步指令)时,所述服务器端所在的视频帧(该视频帧可能是关键帧,也可能是非关键帧)。
如上实施例中,通过解析关键帧信息,有利于客户端迅速SEEK到关键帧;相对于传统地直接解析至当前视频帧,不需要先SEEK到关键帧,然后再根据当前视频帧与关键帧的帧数差再SEEK到该当前视频帧,从而同步效率得到提高。其次,通过预设出预定数量的视频帧,解决了完成同步需要一定时长,导致同步操作本身导致的同步时延问题,进一步提高了同步的正确性。
作为选择,本实施例在解析视频中的关键帧之前还包括:生成时钟同步广播并发送时钟同步广播,即服务器端发送时钟同步广播至所有的客户端。
在又一实施例中,还提供有一种存储介质,所述存储介质被处理器执行以实现上述视频同步方法。存储介质为非瞬时性存储介质。
如图2所示,本实施例的视频同步方法应用于客户端,该客户端位于多屏视频同步播放系统中,该系统包括一台服务器端和多台客户端,服务器端通过网络分别连接各个客户端。服务器端和客户端位于同一局域网中,选择其中任意一台视频设备作为服务器端,局域网中剩余视频设备作为客户端。进一步,该视频同步方法包括:
S20、接收视频同步广播,视频同步广播包括关键帧信息。客户端接收服务器端广播的视频同步广播,关键帧信息包括关键帧的位置信息和关键帧时间信息等。
S21、基于视频同步广播,确定客户端与发送视频同步广播的服务器端是否位于同一帧。具体的,确定客户端与发送视频同步广播的服务器端是否位于同一帧包括:确定客户端与服务器端的播放时延,若播放时延小于一帧对应的时长,则判断客户端与发送视频同步广播的服务器端位于同一帧;否则,则判断客户端与发送视频同步广播的服务器端位于不同帧。例如视频源是30帧/秒,则一帧时间为33.33毫秒;若客户端与服务器端之间的播放时延小于33.33毫秒,判断客户端与发送视频同步广播的服务器端位于同一帧;若客户端与服务器端之间的播放时延大于或等于33.33毫秒,判断客户端与发送视频同步广播的服务器端位于不同帧。
S22、若客户端与发送视频同步广播的终端不位于同一帧,则同步至关键帧。同步至关键帧包括:调用Seek指令同步至关键帧。
本实施例中客户端通过视频同步广播中的关键帧信息确定客户端与发送视频同步广播的服务器端是否位于同一帧,实现服务器端和客户端完成同步。
如图3所示,在上述实施例的基础上,本实施例的视频同步方法在接收视频同步广播之前还包括:
S201、接收时钟同步广播,并确定客户端与发送时钟同步广播的服务器端是否时钟同步;
当时钟同步,则执行接收视频同步广播;
当时钟不同步,则执行时钟同步步骤。进一步,执行时钟同步步骤包括:
S2011、接收时间同步指令后发送时间同步请求指令;其中时间同步请求指令包括客户端的当前时间戳和客户端序列号。
S2012、接收服务器端返回的对应述时间同步请求指令;服务器端接收到时间同步请求指令后,在该时间同步请求指令上加上服务器端当前时间,然后返回至客户端。
S2013、判断往返时间是否小于预设阈值时间,其中往返时间由时间同步请求指令的发送时间和接收时间确定;若往返时间小于预设阈值时间,则完成时间同步。若往返时间不小于预设阈值时间,则执行步骤S2011:接收时间同步指令后发送时间同步请求指令。其中预设阈值时间根据服务器端、客户端、以及所使用的网络属性确定,例如预设阈值时间为20毫秒。
本实施例首先增加客户端和服务器的对时功能,从而解决了客户端和服务器之间指令发送时延问题;其次通过得到视频关键帧时间,在关键帧位置发送视频同步广播,实现服务器端和客户端完成同步。
另一实施例中,还提供有一客户端,所述客户端包括处理器,存储有计算机可读程序的存储器,该计算机可读程序被该处理器执行时实现:
S20、接收视频同步广播,视频同步广播包括关键帧信息。客户端接收服务器端广播的视频同步广播,关键帧信息包括关键帧的位置信息和关键帧时间信息等。
S21、基于视频同步广播,确定客户端与发送视频同步广播的服务器端是否位于同一帧。具体的,确定客户端与发送视频同步广播的服务器端是否位于同一帧包括:确定客户端与服务器端的播放时延,若播放时延小于一帧对应的时长,则判断客户端与发送视频同步广播的服务器端位于同一帧;否则,则判断客户端与发送视频同步广播的服务器端位于不同帧。例如视频源是30帧/秒,则一帧时间为33.33毫秒;若客户端与服务器端之间的播放时延小于33.33毫秒,判断客户端与发送视频同步广播的服务器端位于同一帧;若客户端与服务器端之间的播放时延大于或等于33.33毫秒,判断客户端与发送视频同步广播的服务器端位于不同帧。
S22、若客户端与发送视频同步广播的终端不位于同一帧,则同步至关键帧。同步至关键帧包括:调用Seek指令同步至关键帧。
S201、接收时钟同步广播,并确定客户端与发送时钟同步广播的服务器端是否时钟同步;
当时钟同步,则执行接收视频同步广播;
当时钟不同步,则执行时钟同步步骤。进一步,执行时钟同步步骤包括:
S2011、接收时间同步指令后发送时间同步请求指令;其中时间同步请求指令包括客户端的当前时间戳和客户端序列号。
S2012、接收服务器端返回的对应述时间同步请求指令;服务器端接收到时间同步请求指令后,在该时间同步请求指令上加上服务器端当前时间,然后返回至客户端。
S2013、判断往返时间是否小于预设阈值时间,其中往返时间由时间同步请求指令的发送时间和接收时间确定;若往返时间小于预设阈值时间,则完成时间同步。若往返时间不小于预设阈值时间,则执行步骤S2011:接收时间同步指令后发送时间同步请求指令。其中预设阈值时间根据服务器端、客户端、以及所使用的网络属性确定,例如预设阈值时间为20毫秒。
本实施例首先增加客户端和服务器的对时功能,从而解决了客户端和服务器之间指令发送时延问题;其次通过得到视频关键帧时间,在关键帧位置发送视频同步广播,实现服务器端和客户端完成同步。
在又一实施例中,还提供有一种存储介质,所述存储介质被处理器执行以实现上述视频同步方法。存储介质为非瞬时性存储介质。
如图4所示,本实施例的服务器端视频同步装置应用于服务器端,该服务器端位于多屏视频同步播放系统中,该系统包括一台服务器端和多台客户端,服务器端通过网络分别连接各个客户端。服务器端和客户端位于同一局域网中,选择其中任意一台视频设备作为服务器端,局域网中剩余视频设备作为客户端。进一步,该服务器端视频同步装置包括:
第一解析单元40,用于解析视频中的关键帧。视频中包括关键帧和非关键帧,通过解析视频中的关键帧得到关键帧信息,关键帧信息包括关键帧的位置信息和关键帧时间信息等。
第一发送单元41,用于生成视频同步广播,并在关键帧前预定数量的视频帧处发送视频同步广播。其中视频同步广播包括关键帧序列号、服务器端时间戳、服务器播放器时间点中的至少一项。预定数量的视频帧满足,接收到视频同步广播的客户端从接收到视频同步广播起至完成视频同步的时间长度等于预定数量的视频帧的播放时间长度。服务器端在关键帧前发送视频同步广播,从而给客户端一定的时间调用Seek指令同步至关键帧,保证服务器端和客户端完成同步。
作为选择,本实施例的服务器端视频同步装置还包括:
第一检测单元,用于检测视频跳转指令;
第二解析单元,用于当检测到视频跳转指令时,执行解析视频中的关键帧指令。
第二发送单元,用于在检测到视频跳转指令的视频帧后的第一个关键帧前预定数量的视频帧处发送视频同步广播。
作为选择,本实施例的服务器端视频同步装置还包括:第三发送单元,用于生成时钟同步广播并发送时钟同步广播,即服务器端发送时钟同步广播至所有的客户端。
本实施例中服务器端通过得到视频关键帧时间,在关键帧位置发送视频同步广播,实现服务器端和客户端完成同步。
如图5所示,本实施例的客户端视频同步装置应用于客户端,该客户端位于多屏视频同步播放系统中,该系统包括一台服务器端和多台客户端,服务器端通过网络分别连接各个客户端。服务器端和客户端位于同一局域网中,选择其中任意一台视频设备作为服务器端,局域网中剩余视频设备作为客户端。进一步,该客户端视频同步装置包括:
第一接收单元50,用于接收视频同步广播,视频同步广播包括关键帧信息。客户端接收服务器端广播的视频同步广播,关键帧信息包括关键帧的位置信息和关键帧时间信息等。
第一判断单元51,用于基于视频同步广播,确定客户端与发送视频同步广播的服务器端是否位于同一帧。
具体的,第一判断单元51包括第二判断单元:用于确定客户端与服务器端的时延,若时延小于一帧对应的时长,则判断客户端与发送视频同步广播的服务器端位于同一帧;否则,则判断客户端与发送视频同步广播的服务器端位于不同帧。例如视频源是30帧/秒,则一帧时间为33.33毫秒;若客户端与服务器端之间的时延小于33.33毫秒,判断客户端与发送视频同步广播的服务器端位于同一帧;若客户端与服务器端之间的时延大于或等于33.33毫秒,判断客户端与发送视频同步广播的服务器端位于不同帧。
第一同步单元52,用于若客户端与发送视频同步广播的终端不位于同一帧,则同步至关键帧。
本实施例的客户端视频同步装置还包括:第二同步单元,用于调用Seek指令同步至关键帧。
本实施例中客户端通过视频同步广播中的关键帧信息确定客户端与发送视频同步广播的服务器端是否位于同一帧,实现服务器端和客户端完成同步。
如图6所示,在上述实施例的基础上,本实施例的客户端视频同步装置还包括:
第二接收单元501,用于接收时钟同步广播,并确定客户端与发送时钟同步广播的服务器端是否时钟同步;
第三同步单元,用于当时钟同步,则执行接收视频同步广播;
第四同步单元,用于当时钟不同步,则执行时钟同步步骤。
本实施例的客户端视频同步装置中第四同步单元包括:
第四发送单元5011,用于接收时间同步指令后发送时间同步请求指令;其中时间同步请求指令包括客户端的当前时间戳和客户端序列号。
第三接收单元5012,用于接收服务器端返回的对应述时间同步请求指令;服务器端接收到时间同步请求指令后,在该时间同步请求指令上加上服务器端当前时间,然后返回至客户端。
第三判断单元5013,用于判断往返时间是否小于预设阈值时间,其中往返时间由时间同步请求指令的发送时间和接收时间确定;若是,则完成时间同步。若往返时间不小于预设阈值时间,则执行步骤S2011:接收时间同步指令后发送时间同步请求指令。其中预设阈值时间根据服务器端、客户端、以及所使用的网络属性确定,例如预设阈值时间为20毫秒。
本实施例首先增加客户端和服务器的对时功能,从而解决了客户端和服务器之间指令发送时延问题;其次通过得到视频关键帧时间,在关键帧位置发送视频同步广播,实现服务器端和客户端完成同步。
本说明书中各个实施例采用递进的方式描述,每个实施例重点说明的都是与其他实施例的不同之处,各个实施例之间相同相似部分互相参见即可。对于实施例公开的装置而言,由于其与实施例公开的方法相对应,所以描述的比较简单,相关之处参见方法部分说明即可。
以上实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人士能够了解本发明的内容并据此实施,并不能限制本发明的保护范围。凡跟本发明权利要求范围所做的均等变化与修饰,均应属于本发明权利要求的涵盖范围。
Claims (20)
- 一种视频同步方法,应用于服务器端,其特征在于,所述方法包括:解析视频中的关键帧;生成视频同步广播,并在所述关键帧前预定数量的视频帧处发送视频同步广播。
- 根据权利要求1所述的视频同步方法,其特征在于,所述视频同步广播包括关键帧序列号、服务器端时间戳、服务器播放器时间点中的至少一项。
- 根据权利要求1所述的视频同步方法,其特征在于,所述预定数量的视频帧满足,接收到所述视频同步广播的客户端从接收到所述视频同步广播起至完成视频同步的时间长度等于所述预定数量的视频帧的播放时间长度。
- 根据权利要求1所述的视频同步方法,其特征在于,所述解析视频中的关键帧之前所述方法包括:检测视频跳转指令;当检测到视频跳转指令时,执行解析视频中的关键帧指令;所述在所述关键帧前预定数量的视频帧处发送视频同步广播包括,在检测到视频跳转指令的视频帧后的第一个关键帧前预定数量的视频帧处发送视频同步广播。
- 根据权利要求1所述的视频同步方法,其特征在于,所述解析视频中的关键帧之前所述方法包括:生成时钟同步广播并发送所述时钟同步广播。
- 一种视频同步方法,应用于客户端,其特征在于,所述方法包括:接收视频同步广播,所述视频同步广播包括关键帧信息;基于所述视频同步广播,确定所述客户端与发送所述视频同步广播的服务器端是否位于同一帧;若所述客户端与发送所述视频同步广播的终端不位于同一帧,则同步至所述关键帧。
- 根据权利要求6所述的视频同步方法,其特征在于,所述基于所述视频同步广播,确定所述客户端与发送所述视频同步广播的服务器端是否位于同一帧包括:确定所述客户端与所述服务器端的时延,若所述时延小于一帧对应的时长,则判断所述客户端与发送所述视频同步广播的服务器端位于同一帧;否则,则判断所述客户端与发送所述视频同步广播的服务器端位于不同帧。
- 根据权利要求6所述的视频同步方法,其特征在于,所述同步至所述关键帧包括:调用Seek指令同步至所述关键帧。
- 根据权利要求6所述的视频同步方法,其特征在于,所述接收视频同步广播之前,包括接收时钟同步广播,并确定所述客户端与发送所述时钟同步广播的服务器端是否时钟同步;当时钟同步,则执行所述接收视频同步广播;当时钟不同步,则执行时钟同步步骤。
- 根据权利要求9所述的视频同步方法,其特征在于,所述执行时钟同步步骤包括:接收时间同步指令后发送时间同步请求指令;接收服务器端返回的对应述时间同步请求指令;判断往返时间是否小于预设阈值时间,其中所述往返时间由所述时间同步请求指令的发送时间和接收时间确定;若是,则完成时间同步。
- 一种服务器端视频同步装置,其特征在于,所述装置包括:第一解析单元,用于解析视频中的关键帧;第一发送单元,用于生成视频同步广播,并在所述关键帧前预定数量的视频帧处发送视频同步广播。
- 根据权利要求11所述的服务器端视频同步装置,其特征在于,所述视频同步广播包括关键帧序列号、服务器端时间戳、服务器播放器时间点中的至少一项。
- 根据权利要求11所述的服务器端视频同步装置,其特征在于,所述预定数量的视频帧满足,接收到所述视频同步广播的客户端从接收到所述视频同步广播起至完成视频同步的时间长度等于所述预定数量的视频帧的播放时间长度。
- 根据权利要求11所述的服务器端视频同步装置,其特征在于,所述装置还包括:第一检测单元,用于检测视频跳转指令;第二解析单元,用于当检测到视频跳转指令时,执行解析视频中的关键帧指令;第二发送单元,用于在检测到视频跳转指令的视频帧后的第一个关键帧前预定数量的视频帧处发送视频同步广播。
- 根据权利要求11所述的服务器端视频同步装置,其特征在于,所述装置还包括:第三发送单元,用于生成时钟同步广播并发送所述时钟同步广播。
- 一种客户端视频同步装置,其特征在于,所述装置包括:第一接收单元,用于接收视频同步广播,所述视频同步广播包括关键帧信息;第一判断单元,用于基于所述视频同步广播,确定所述客户端与发送所述视频同步广播的服务器端是否位于同一帧;第一同步单元,用于若所述客户端与发送所述视频同步广播的终端不位于同一帧,则同步至所述关键帧。
- 根据权利要求16所述的客户端视频同步装置,其特征在于,所述装置还包括:第二判断单元,用于确定所述客户端与所述服务器端的时延,若所述时延小于一帧对应的时长,则判断所述客户端与发送所述视频同步广播的服务器端位于同一帧;否则,则判断所述客户端与发送所述视频同步广播的服务器端位于不同帧。
- 根据权利要求16所述的客户端视频同步装置,其特征在于,所述装置还包括:第二同步单元,用于调用Seek指令同步至所述关键帧。
- 根据权利要求16所述的客户端视频同步装置,其特征在于,所述装置还包括第二接收单元,用于接收时钟同步广播,并确定所述客户端与发送所述时钟同步广播的服务器端是否时钟同步;第三同步单元,用于当时钟同步,则执行所述接收视频同步广播;第四同步单元,用于当时钟不同步,则执行时钟同步步骤。
- 根据权利要求19所述的客户端视频同步装置,其特征在于,所述第四同步单元包括:第四发送单元,用于接收时间同步指令后发送时间同步请求指令;第三接收单元,用于接收服务器端返回的对应述时间同步请求指令;第三判断单元,用于判断往返时间是否小于预设阈值时间,其中所述往返时间由所述时间同步请求指令的发送时间和接收时间确定;若是,则完成时间同步。
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