CN109413443B - Method and device for realizing time shifting function - Google Patents
Method and device for realizing time shifting function Download PDFInfo
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- 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
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/23418—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics
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- H04N21/26208—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists the scheduling operation being performed under constraints
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- H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
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Abstract
The invention relates to a multimedia technology, and provides a method and a device for realizing a time shifting function, which are used for improving the accuracy of video contents searched by a time shifting mode. The method comprises the following steps: the network server performs refined slicing on N original slice files including the time shifting starting position point in front of the time shifting starting position point according to the specified target duration, and sends the obtained target slice files to the time shifting terminal, and the time shifting terminal performs time shifting operation on the target slice files according to the preset step length until the time shifting starting end point indicated by the user is reached. Compared with the original slice file, the target slice file has shorter duration, so that the time shifting terminal can be positioned to the time shifting starting end point appointed by the user more easily when performing time shifting operation, the accuracy of the video content searched by the time shifting terminal through the time shifting mode can be effectively improved, and the phenomenon of video content jumping in the time shifting process is avoided.
Description
Technical Field
The present invention relates to multimedia technologies, and in particular, to a method and an apparatus for implementing a time shift function.
Background
With the development of technology, time-shifted television (TSoC) has become increasingly popular. The time-shift television refers to that when a viewer watches a digital television program, the viewer can press a pause key or a rewind/fast forward key at any time to select a program point which the viewer needs to watch.
For example, when a user watches live video content, if a part of the played video content is missed due to temporary going out, the user may press the "back" key to enter the time shift mode to watch the played video content (generally within 2 hours), and after the watching is finished, the user may press the "exit" key to exit the time shift mode.
In general, the live broadcasting of video content can be realized in a multicast mode and a unicast mode.
The multicast method is implemented by using Internet Group Management Protocol (IGMP) Protocol. The playing terminal can obtain the live video content only by joining the multicast group.
The unicast scheme is implemented using HTTP Live Streaming (HLS) protocol. The live video content can be cut into a plurality of fragments, and the terminal downloads and plays the plurality of fragments.
After providing live video content to a user, it is also necessary to provide a time shift function and a review function to the user, where the time shift function can be implemented by HLS protocol, and HLS is a mainstream technology used at present.
In the prior art, the HLS protocol is used to realize the time shift function, which mainly slices a video file to obtain a plurality of slice files, and then the terminal downloads and plays the slice files, usually slicing in 10 seconds. Therefore, when the terminal plays the currently moved slice file, the played position point is not the position point that the user wants to watch, and a screen flashing phenomenon may occur.
Obviously, in the prior art, the terminal cannot accurately provide the video content of the position point which the terminal wants to watch to the user in the time-shifting mode.
Disclosure of Invention
The embodiment of the invention provides a method and a device for realizing a time shifting function, which are used for improving the accuracy of video contents searched by a time shifting mode.
The embodiment of the invention provides the following specific technical scheme:
in a first aspect, a method for implementing a time shift function includes:
determining a time shifting starting position point indicated by a user based on a notification of a time shifting terminal, and acquiring N original slice files which are in front of the time shifting starting position point and contain the time shifting starting position point, wherein N is a preset parameter, and the slice files are obtained after slicing video contents according to a system default duration;
slicing the obtained N original slice files again according to a specified target time length to obtain a plurality of target slice files, wherein the target time length is less than the default time length of the system;
and sending the target slice files to the time shifting terminal, and triggering the time shifting terminal to perform time shifting operation in the target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
Optionally, re-slicing the obtained N original slice files according to a specified target duration to obtain a plurality of target slice files, including:
dividing the N original slice files into a plurality of file groups, and respectively slicing each file group again by adopting corresponding target time length, wherein the target time length corresponding to one file group is positively correlated with the distance between the one file group and a time-shifting starting position point.
Optionally, sending the plurality of target slice files to the time shift terminal includes:
determining the total time Tn of all target slice files, determining the total time Tc required by generating the target slice files, and determining the generated time Ts of time shifting operation;
if Ts is greater than Tn + Tc, all the target slice files are sent to the time shifting terminal;
and if Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point, stopping sending the target slice file to the time shifting terminal based on the time shifting end position point.
Optionally, further comprising:
determining a pause starting position point indicated by a user based on the notification of the time-shifting terminal;
judging whether an original slice file with the pause position point as a starting point exists in the generated original slice files, if so, directly acquiring the original slice file as the pause slice file, otherwise, determining the starting point based on the pause position point, and re-slicing the video content behind the starting point to obtain the pause slice file;
and sending the obtained pause slice file to a time shift terminal, and triggering the time shift terminal to start playing the video content based on the pause slice file when the user indicates to finish pausing.
Optionally, determining a starting point based on the pause location point includes:
and taking a position point N seconds before the pause position point as a starting point, wherein N is more than or equal to 0.
In a second aspect, a method for implementing a time shift function includes:
informing a time shifting starting position point indicated by a user to a network server, and triggering the network server to execute the following operations: acquiring N original slice files which are in front of the time-shifting starting position point and contain the time-shifting starting position point, and re-slicing the acquired N original slice files according to a specified target duration to acquire a plurality of target slice files, wherein N is a preset parameter, the slice files are obtained after video contents are sliced according to a system default duration, and the target duration is less than the system default duration;
and receiving the target slice files issued by the network server, and performing time shifting operation in the target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
Optionally, the receiving the plurality of target slice files sent by the network server includes:
determining the total time Tn of all target slice files, determining the total time Tc required by generating the target slice files, and determining the generated time Ts of time shifting operation;
if Ts is greater than Tn + Tc, downloading all target slice files;
and if Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point and the target slice file containing the time shifting end position point is downloaded, stopping downloading.
Optionally, performing a time shift operation in the plurality of target slice files according to a preset step size includes:
and starting from the time shifting starting position point to the front, and respectively adopting corresponding time shifting frequency according to the distance between each target slice file and the time shifting starting position point to perform time shifting operation in the corresponding target slice file.
Optionally, further comprising:
informing a time shifting starting position point indicated by a user to a network server, and triggering the network server to execute the following operations: judging whether an original slice file with the pause position point as a starting point exists in the generated original slice files or not based on the pause starting position point, if so, directly acquiring the original slice file as a pause slice file, otherwise, determining the starting point based on the pause position point, and re-slicing the video content behind the starting point to obtain the pause slice file;
and receiving a pause slice file issued by the network server, and starting to play the video content based on the pause slice file when the user indicates to finish pausing.
In a third aspect, an apparatus for implementing a time shift function includes:
an obtaining unit, configured to determine a time-shift starting position point indicated by a user based on a notification of a time-shift terminal, and obtain N original slice files that are before the time-shift starting position point and include the time-shift starting position point, where N is a preset parameter, and the slice files are obtained after slicing video content according to a system default duration;
the processing unit is used for slicing the obtained N original slice files again according to the specified target time length to obtain a plurality of target slice files, wherein the target time length is less than the system default time length;
and the communication unit is used for sending the target slice files to the time shifting terminal and triggering the time shifting terminal to perform time shifting operation in the target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
Optionally, when the N original slice files obtained are sliced again according to the specified target duration to obtain a plurality of target slice files, the processing unit is configured to:
dividing the N original slice files into a plurality of file groups, and respectively slicing each file group again by adopting corresponding target time length, wherein the target time length corresponding to one file group is positively correlated with the distance between the one file group and a time-shifting starting position point.
Optionally, when the plurality of target slice files are sent to the time shift terminal, the communication unit is configured to:
determining the total time Tn of all target slice files, determining the total time Tc required by generating the target slice files, and determining the generated time Ts of time shifting operation;
if Ts is greater than Tn + Tc, all the target slice files are sent to the time shifting terminal;
and if Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point, stopping sending the target slice file to the time shifting terminal based on the time shifting end position point.
Optionally, the processing unit is further configured to:
determining a pause starting position point indicated by a user based on the notification of the time-shifting terminal;
judging whether an original slice file with the pause position point as a starting point exists in the generated original slice files, if so, directly acquiring the original slice file as the pause slice file, otherwise, determining the starting point based on the pause position point, and re-slicing the video content behind the starting point to obtain the pause slice file;
the communication unit is further configured to:
and sending the obtained pause slice file to a time shift terminal, and triggering the time shift terminal to start playing the video content based on the pause slice file when the user indicates to finish pausing.
Optionally, when determining the start point based on the pause location point, the processing unit is configured to:
and taking a position point N seconds before the pause position point as a starting point, wherein N is more than or equal to 0.
In a fourth aspect, an apparatus for implementing a time shift function includes:
a communication unit, configured to notify the network server of the time-shift starting location point indicated by the user, and trigger the network server to perform the following operations: acquiring N original slice files which are in front of the time-shifting starting position point and contain the time-shifting starting position point, and re-slicing the acquired N original slice files according to a specified target duration to acquire a plurality of target slice files, wherein N is a preset parameter, the slice files are obtained after video contents are sliced according to a system default duration, and the target duration is less than the system default duration;
and the time shifting unit is used for receiving the target slice files issued by the network server and carrying out time shifting operation on the target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
Optionally, when receiving the plurality of target slice files sent by the network server, the communication unit is configured to:
determining the total time Tn of all target slice files, determining the total time Tc required by generating the target slice files, and determining the generated time Ts of time shifting operation;
if Ts is greater than Tn + Tc, downloading all target slice files;
and if Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point and the target slice file containing the time shifting end position point is downloaded, stopping downloading.
Optionally, when performing a time shift operation in the plurality of target slice files according to a preset step size, the time shift unit is configured to:
and starting from the time shifting starting position point to the front, and respectively adopting corresponding time shifting frequency according to the distance between each target slice file and the time shifting starting position point to perform time shifting operation in the corresponding target slice file.
Optionally, the communication unit is further configured to:
informing a time shifting starting position point indicated by a user to a network server, and triggering the network server to execute the following operations: judging whether an original slice file with the pause position point as a starting point exists in the generated original slice files or not based on the pause starting position point, if so, directly acquiring the original slice file as a pause slice file, otherwise, determining the starting point based on the pause position point, and re-slicing the video content behind the starting point to obtain the pause slice file;
the time shifting unit is further configured to:
and receiving a pause slice file issued by the network server, and starting to play the video content based on the pause slice file when the user indicates to finish pausing.
A fifth aspect is a computing device comprising a memory for storing program instructions and a processor for calling the program instructions stored in the memory and executing the method of any of the first aspects according to the obtained program instructions.
A sixth aspect, the computer-readable storage medium having stored thereon computer-executable instructions for causing the computer to perform the method of any of the first aspects.
A seventh aspect, a computing device, comprising a memory for storing program instructions and a processor for calling the program instructions stored in the memory and executing the method of any of the second aspects according to the obtained program instructions.
An eighth aspect is a computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any of the second aspects.
In the embodiment of the invention, a network server acquires N original slice files containing a time-shifting starting position point before the time-shifting starting position point, finely slices the acquired N original slice files according to the specified target time length, and sends a plurality of acquired target slice files to a time-shifting terminal, and the time-shifting terminal performs time-shifting operation on the plurality of target slice files according to the preset step length until the time-shifting starting end point indicated by a user is reached. Compared with the original slice file, the target slice file has shorter duration, so that the time shifting terminal can be positioned to the time shifting starting end point appointed by the user more easily when performing time shifting operation, the accuracy of the video content searched by the time shifting terminal through the time shifting mode can be effectively improved, and the phenomenon of video content jumping in the time shifting process is avoided.
Drawings
Fig. 1 is a schematic flow chart of searching video content through a time shift function according to an embodiment of the present invention;
FIG. 2 is a functional block diagram of a network server according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a time-shift terminal in an embodiment of the present invention.
Detailed Description
In order to improve the accuracy of the video content searched in the time-shift mode, in the embodiment of the invention, the played video content is sliced again from the time-shift starting position point indicated by the user, a slice file with a finer time unit is obtained, and in the newly divided slice file, the corresponding video content is searched according to the time-shift ending position point indicated by the user.
Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Currently, when a user uses a time-shifting terminal (for example, a television with a time-shifting function or a set-top box with a time-shifting function), the user can enter a live channel to watch live video content when watching the live video content, and at this time, the time-shifting terminal can provide live video content for the user through an IGMP multicast mode or an HLS unicast mode.
When the IGMP multicast mode is adopted to realize the live broadcast, the time-shifting terminal is required to join in the multicast, so that the network server can uniformly send the live video resources to the live broadcast group for the time-shifting terminal to play.
When the HLS unicast mode is adopted to realize live broadcasting, the time shifting terminal needs to download the slice file from the network server, and live video content is provided for the user through the slice file.
When a user indicates a time shifting terminal to switch from a live broadcast mode to a time shifting mode, if the live broadcast video content is provided by adopting an IGMP multicast mode before, the time shifting terminal exits a live broadcast group, downloads a slice file corresponding to a time shifting starting time point appointed by the user from a network server with the nearest routing distance, and prepares to provide the time-shifted video content for the user; if the HLS unicast mode is used to provide the live video content, the time-shift terminal generally backward watches the video content that is not seen clearly or that is desired to be watched repeatedly after entering the time-shift mode, and the time length between the time-shift ending position point and the time-shift starting position point is generally not too long, so that, optionally, the time-shift terminal provides the time-shifted video content within M hours (e.g., 2 hours) to the user at most.
In the embodiment of the invention, the time shifting starting position point and the time ending position point are not objective time, but refer to the playing position of the video content when the user indicates to start the time shifting mode and the playing position of the video content when the user indicates to end the time shifting mode.
Referring to fig. 1, in the embodiment of the present invention, a specific process of the time shift terminal implementing the time shift function is as follows:
step 100: and the time shifting terminal starts a time shifting mode according to the user instruction, determines a time shifting starting position point appointed by the user, and reports the time shifting starting position point to the network server.
Specifically, when the user initiates the time shift operation, the time shift terminal enters the time shift mode and records the position point of the current live video content as the time shift start position point.
In the embodiment of the present invention, in order to improve the time shifting efficiency, the network server generally employs a server at the edge of the network, that is, a server closer to the route of the time shifting terminal, which is also referred to as an edge server, and will not be described in detail later.
Step 101: and the network server acquires N original slice files which are in front of the time shifting starting position point and contain the time shifting starting position point.
The slice file generally includes two parts, one part is an index file, and the other part is a video file, the index file can be regarded as a directory of video files, at least names of the video files included in the slice file are generally recorded, and a part of the video contents in the entire live video contents is recorded in the video file. The original slicing file refers to a file obtained by slicing the live video content according to a default duration (typically 10s) of the system.
Alternatively, N is 10, that is, the network server obtains 10 original slice files, which contain the time shift start position point and are generated based on the video content before the time shift start position point, that is, 100 seconds of original slice files.
Step 102: and the network server re-slices the obtained N sliced files according to the specified target time length to obtain a plurality of target sliced files, wherein the target time length is less than the default time length of the system.
Dividing N original slice files into a plurality of file groups, and respectively re-slicing each file group by adopting corresponding target time length, wherein the target time length corresponding to one file group is positively correlated with the distance between the one file group and the time-shifting starting position point, namely the closer the distance between the file group and the time-shifting starting position point is, the shorter the corresponding target time length is.
For example, assume that N is 10, divided into two groups, one group containing 5 original slice files, a group that is close in time to the time shift start position point is referred to as N1, and a group that is adjacent to N1 and relatively far from the time shift start position point is referred to as N2.
Then, for N1, the network server re-slices N2 according to a first target duration (which is only an example, and may also be 1 second or less) that is less than or equal to 2 seconds, to generate 5 × (10/2) ═ 25 new target slice files, and for N2, the network server re-slices into 5 × (10/5) ═ 10 or more new target slice files according to a second target duration (which is only an example) that is greater than 2 seconds and less than or equal to 5 seconds, and after re-slicing, the network server issues all the latest target slice files to the time shift terminal.
Step 103: and the network server sends the target slice files to the time shifting terminal.
Step 104: and the time shifting terminal performs time shifting operation in the obtained plurality of target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
Specifically, when receiving the target slice file, the time shift terminal needs to refer to a time shift end position point specified by a user and determine the download amount of the target slice file based on a time shift waiting delay requirement of the user.
In the embodiment of the present invention, the time shift terminal may be set to download at least M target slice files, and optionally, M is 35. That is, at least 35 or more target slice files are downloaded from the time shift start point, that is, the target slice file including the re-slicing at the time interval of 2 seconds in the above N1 and the target slice file including the re-slicing at the time interval of 5 seconds in the above N2.
Let the time for downloading a target slice file be T1, and T1 is the bandwidth rate of the network where the time-shift terminal is located/(target duration x code rate corresponding to the slice). Then, the total time length for downloading 35 target slice files is: t35 ═ 35 × T1.
Assuming that the total time length for downloading all the object slice files is Tn and the total time length required for generating the object slice files is Tc, the time shifting terminal will determine the generated time length Ts of the time shifting operation first and compare Ts, Tn and Tc.
And if Ts is greater than Tn + Tc, downloading all the target slice files for the user to watch in a time-shifting manner.
Of course, if all target slice files are downloaded, the size of the buffer area needs to be considered, and the target slice files need to be downloaded within the tolerance range of the buffer area, which is not described herein again.
After the time shift terminal finishes downloading all target slice files, if the time shift operation is still continued, and the time shift end position point is not reached (possibly, the user indicates the time shift end position point, or the time shift end position point is not shifted), the time shift terminal will continue downloading the original slice files (i.e., slices in units of 10 seconds) to continue the time shift operation.
If Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point, the time shifting terminal stops downloading the target slice file based on the time shifting end position point.
Therefore, the time shifting end position point can be ensured to be positioned in the target slice file, and a user can obtain more accurate time shifting watching content.
Further, assuming that the time-shift end position point indicated by the user is beyond the range of the target slice file, the time-shift terminal may still continue to provide the Ts file of the original slice file (i.e., slicing in units of 10 seconds) to the time-shift terminal for the user to watch with the time-shift content.
In the embodiment of the present invention, as the original slice file within a time length of about 100 seconds (10 seconds × 10) before the time shift start position point can be re-sliced, according to the usage habit of a general user, the user generally requires that the time shift end position point is accurately positioned within 1-2 minutes ahead from the time shift start position point, and the content moving ahead again is time-shifted according to the granularity of the original slice file, which can meet the requirement.
Of course, in step 104, the operation of comparing Ts, Tn, and Tc may also be completed by the network server, and based on the comparison result, it is determined what manner to send the target slice file to the time-shift terminal, optionally:
and if Ts is greater than Tn + Tc, the network server sends all the target slice files to the time shifting terminal.
Of course, if the time shift operation is not stopped after the target slice file is sent, the network server will continue to send the original slice file to the time shift terminal, which is not described herein again.
Correspondingly, the time shift terminal can also download all the target slice files when Ts > Tn + Tc is determined.
And if Ts is less than or equal to Tn + Tc, the network server determines that the user indicates a time shifting end position point, and stops sending the target slice file to the time shifting terminal based on the time shifting end position point.
Correspondingly, the time-shift terminal may also stop downloading when downloading the target slice file containing the time-shift end position point based on the time-shift end position point indicated by the user when it is determined that Ts is less than or equal to Tn + Tc.
Of course, if the time-shift end position point indicated by the user exceeds the range of the target slice file, the network server will continue to send the original slice file to the time-shift terminal, which is not described herein again.
Furthermore, in the embodiment of the present invention, the time shift terminal performs a time shift operation in the target slice file by using a corresponding time shift frequency according to a distance between the time shift current position point and the time shift starting position point, respectively, from the time shift starting position point forward.
The so-called time shift operation, in the embodiment of the present invention, is to find a video key frame (hereinafter referred to as an I frame) in a target slice file. The time shifting terminal searches an I frame closest to the time shifting starting position point in the target slice file from the time shifting starting position point, and then the I frame starts to retreat at a constant speed by adopting a gradual change frequency, for example, the I frame can be searched in the time shifting frequency target slice file of 1 second, 2 seconds, 2.5 seconds, 5 seconds and the like.
For example, assuming that the time-shift current location point is denoted as Tshifte and the time-shift start location point is denoted as Tshiftb, the time-shift terminal adjusts the time-shift frequency based on Td, Tshifte-Tshiftb, starting from the time-shift start location point in the target slice file.
For example, if Td is Tshifte-Tshiftb <1 minute, the time shift terminal may perform I-frame search at a time shift frequency of 1 second.
For another example, if 1 minute < Td ═ Tshifte-Tshiftb <5 minutes, the time-shift terminal may perform I-frame search at a time-shift frequency of 2 seconds or 2.5 seconds.
For another example, if Td >5 minutes, the time-shifted terminal may perform I-frame search at a time-shifted frequency of 5 seconds.
Once the I-frame is found, it needs to be displayed to the user so that the user can determine whether the time shift operation needs to be stopped based on the displayed I-frame.
Based on the foregoing embodiments, further, in the embodiments of the present invention, in addition to providing a time shift operation from the time shift starting position to the front, the time shift terminal may also provide a backward time shift operation for the user after the user indicates to pause playing of the video content.
In practical applications, when a user watches a live program, the user leaves the live program for a while for some reason, and when the user wants to return, the user can continue watching from a pause position, and the user does not have to jump the content during playing.
In general, the above functions may be realized by a multicast mode, and a time-shift terminal may receive a live video stream after joining a multicast group. When a user indicates that the time-shift terminal pauses the video content currently being played, the time-shift terminal starts to enter a time-shift state, and specifically, the time-shift terminal can start to download the original slice file. The original slice file downloaded by the time-shifting terminal is processed by the network server, so that the time position of the original slice file is before the pause point, and after the time-shifting terminal finds the downloaded original slice file from the pause point, the starting point of the original slice file is not necessarily the pause point, so that when the user returns to indicate to finish pause, the time-shifting terminal continues to play the video content, and the video content jump phenomenon occurs.
In order to overcome the above defects, in the embodiment of the present invention, the following processing is performed:
firstly, the time shifting terminal determines a pause position point indicated by a user and reports the pause position point to a network server.
Secondly, after the network server obtains the pause position point reported by the time-shifting terminal, the network server searches whether an original slice file which takes the pause position point as a starting point exists in the generated original slice file, if so, the original slice file is directly obtained as the pause slice file, otherwise, the network server determines the starting point based on the pause position point, and re-slices the video content behind the starting point to obtain the pause slice file.
In practical applications, if the time duration Tp of the pause of the user is short, for example, Tp <5s, the network server may not complete the re-slicing and sending of the video content in time, and in order to ensure that the network server has enough time to complete the above operations, optionally, the network server may start re-slicing the video content after the starting point with a position point N seconds before the pause position point as a starting point, where N is greater than or equal to 0 (i.e., when it is determined that the user will pause for a long time, N may also be 0, that is, directly with the pause position point as the starting point).
Finally, the network server sends the obtained pause slice file to the time-shifting terminal.
And the time shifting terminal receives the pause slice file sent by the network server, and can smoothly continue to play the video content from the pause position point when the user indicates to stop pausing.
In the foregoing embodiment, optionally, the time-shift terminal implements live broadcasting of the video content in a multicast manner, and when the network server performs live broadcasting on the video content, the slicing duration adopted by the network server is smaller than the system default duration (e.g., 10 seconds) adopted by the original slicing file, and optionally, the slicing duration may adopt 5 seconds or 3 seconds.
On the other hand, in the embodiment of the present invention, the slice service capability is sunk to the edge service node, that is, the network server is a service node which is located at the edge of the network side and has the closest routing distance with the time-shifting terminal, so that the network server can quickly respond to the request of the time-shifting terminal and timely provide the relevant target slice file, so that the time-shifting terminal can quickly and accurately complete the time-shifting operation.
Based on the above embodiments, referring to fig. 2, in an embodiment of the present invention, the network server at least includes an obtaining unit 20, a processing unit 21 and a communication unit 22, wherein,
an obtaining unit 20, configured to determine a time shift starting position point indicated by a user based on a notification of a time shift terminal, and obtain N original slice files that are before the time shift starting position point and include the time shift starting position point, where N is a preset parameter, and the slice files are obtained after slicing video content according to a system default duration;
the processing unit 21 is configured to slice the obtained N original slice files again according to a specified target duration to obtain a plurality of target slice files, where the target duration is less than the system default duration;
and the communication unit 22 is configured to send the target slice files to the time shift terminal, and trigger the time shift terminal to perform a time shift operation on the target slice files according to a preset step length until a time shift start end point indicated by a user is reached.
Optionally, when the N original slice files obtained are sliced again according to the specified target duration to obtain a plurality of target slice files, the processing unit 21 is configured to:
dividing the N original slice files into a plurality of file groups, and respectively slicing each file group again by adopting corresponding target time length, wherein the target time length corresponding to one file group is positively correlated with the distance between the one file group and a time-shifting starting position point.
Optionally, when the target slice files are sent to the time shift terminal, the communication unit 22 is configured to:
determining the total time Tn of all target slice files, determining the total time Tc required by generating the target slice files, and determining the generated time Ts of time shifting operation;
if Ts is greater than Tn + Tc, all the target slice files are sent to the time shifting terminal;
and if Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point, stopping sending the target slice file to the time shifting terminal based on the time shifting end position point.
Optionally, the processing unit 21 is further configured to:
determining a pause starting position point indicated by a user based on the notification of the time-shifting terminal;
judging whether an original slice file with the pause position point as a starting point exists in the generated original slice files, if so, directly acquiring the original slice file as the pause slice file, otherwise, determining the starting point based on the pause position point, and re-slicing the video content behind the starting point to obtain the pause slice file;
the communication unit 22 is further configured to:
and sending the obtained pause slice file to a time shift terminal, and triggering the time shift terminal to start playing the video content based on the pause slice file when the user indicates to finish pausing.
Optionally, when determining the starting point based on the pause location point, the processing unit 21 is configured to:
and taking a position point N seconds before the pause position point as a starting point, wherein N is more than or equal to 0.
Based on the above-mentioned embodiments, referring to fig. 3, in one embodiment of the present invention, the time-shifting terminal includes at least a communication unit 30 and a time-shifting unit 31, wherein,
a communication unit 30, configured to notify the network server of the time-shift starting location point indicated by the user, and trigger the network server to perform the following operations: acquiring N original slice files which are in front of the time-shifting starting position point and contain the time-shifting starting position point, and re-slicing the acquired N original slice files according to a specified target duration to acquire a plurality of target slice files, wherein N is a preset parameter, the slice files are obtained after video contents are sliced according to a system default duration, and the target duration is less than the system default duration;
the time shifting unit 31 is configured to receive the target slice files sent by the network server, and perform a time shifting operation on the target slice files according to a preset step length until a time shifting start end point indicated by the user is reached.
Optionally, when receiving the plurality of target slice files sent by the web server, the communication unit 30 is configured to:
determining the total time Tn of all target slice files, determining the total time Tc required by generating the target slice files, and determining the generated time Ts of time shifting operation;
if Ts is greater than Tn + Tc, downloading all target slice files;
and if Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point and the target slice file containing the time shifting end position point is downloaded, stopping downloading.
Optionally, when performing a time shift operation in the plurality of target slice files according to a preset step size, the time shift unit 31 is configured to:
and starting from the time shifting starting position point to the front, and respectively adopting corresponding time shifting frequency according to the distance between each target slice file and the time shifting starting position point to perform time shifting operation in the corresponding target slice file.
Optionally, the communication unit 30 is further configured to:
informing a time shifting starting position point indicated by a user to a network server, and triggering the network server to execute the following operations: judging whether an original slice file with the pause position point as a starting point exists in the generated original slice files or not based on the pause starting position point, if so, directly acquiring the original slice file as a pause slice file, otherwise, determining the starting point based on the pause position point, and re-slicing the video content behind the starting point to obtain the pause slice file;
the time shift unit 31 is further configured to:
and receiving a pause slice file issued by the network server, and starting to play the video content based on the pause slice file when the user indicates to finish pausing.
In one embodiment of the present invention, a computing device is provided, which includes a memory for storing program instructions and a processor for calling the program instructions stored in the memory and executing any one of the methods executed by the network server according to the obtained program instructions.
In one embodiment of the present invention, a computer-readable storage medium is provided, which stores computer-executable instructions for causing the computer to perform any one of the methods performed by the network server described above.
In one embodiment of the present invention, a computing device is provided, which includes a memory and a processor, wherein the memory is used for storing program instructions, and the processor is used for calling the program instructions stored in the memory and executing any one of the methods executed by the time-shifting terminal according to the obtained program instructions.
In one embodiment of the present invention, a computer storage medium is provided, which stores computer-executable instructions for causing the computer to perform any one of the methods performed by the network server described above.
In summary, in the embodiment of the present invention, the network server obtains N original slice files including the time shift start position point before the time shift start position point, performs refined slicing on the obtained N original slice files according to the specified target duration, and sends the obtained target slice files to the time shift terminal, and the time shift terminal performs a time shift operation on the target slice files according to the preset step length until the time shift start end point indicated by the user is reached. Compared with the original slice file, the target slice file has shorter duration, so that the time shifting terminal can be positioned to the time shifting starting end point appointed by the user more easily when performing time shifting operation, the accuracy of the video content searched by the time shifting terminal through the time shifting mode can be effectively improved, and the phenomenon of video content jumping in the time shifting process is avoided.
Furthermore, when time shifting operation is performed, the time shifting terminal can also adjust the time shifting frequency according to the occurrence duration of the time shifting operation, so that the time shifting requirement of a user can be met, and the time shifting searching efficiency is improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (14)
1. A method for implementing a time shift function, comprising:
determining a time shifting starting position point indicated by a user based on a notification of a time shifting terminal, and acquiring N original slice files which are in front of the time shifting starting position point and contain the time shifting starting position point, wherein N is a preset parameter, and the original slice files are obtained after slicing video contents according to a system default duration;
dividing the N original slice files into a plurality of file groups, and respectively slicing each file group again by adopting corresponding target time length to obtain a plurality of target slice files, wherein the target time length corresponding to one file group is positively correlated with the distance between the one file group and a time-shifting starting position point, and the target time length is less than the default time length of the system;
and sending the target slice files to the time shifting terminal, and triggering the time shifting terminal to perform time shifting operation in the target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
2. The method of claim 1, wherein sending the plurality of target slice files to the time-shifting terminal comprises:
determining the total time Tn of all target slice files, determining the total time Tc required by generating the target slice files, and determining the generated time Ts of time shifting operation;
if Ts is greater than Tn + Tc, all the target slice files are sent to the time shifting terminal;
and if Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point, stopping sending the target slice file to the time shifting terminal based on the time shifting end position point.
3. The method of claim 1 or 2, further comprising:
determining a pause starting position point indicated by a user based on the notification of the time-shifting terminal;
judging whether an original slice file with the pause starting position point as a starting point exists in the generated original slice files, if so, directly acquiring the original slice file as the pause slice file, otherwise, determining the starting point based on the pause starting position point, and re-slicing the video content behind the starting point to obtain the pause slice file;
and sending the obtained pause slice file to a time shift terminal, and triggering the time shift terminal to start playing the video content based on the pause slice file when the user indicates to finish pausing.
4. The method of claim 3, wherein determining a starting point based on the pause start location point comprises:
and taking a position point N seconds before the pause starting position point as a starting point, wherein N is more than or equal to 0.
5. A method for implementing a time shift function, comprising:
informing a time shifting starting position point indicated by a user to a network server, and triggering the network server to execute the following operations:
acquiring N original slice files containing the time-shifting starting position point before the time-shifting starting position point, dividing the N original slice files into a plurality of file groups, and re-slicing each file group by adopting corresponding target time length to acquire a plurality of target slice files, wherein the target time length corresponding to one file group is positively correlated with the distance between the one file group and the time-shifting starting position point, N is a preset parameter, the original slice files are files obtained by slicing video contents according to system default time length, and the target time length is less than the system default time length;
and receiving the target slice files issued by the network server, and performing time shifting operation in the target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
6. The method of claim 5, wherein receiving the plurality of target slice files from a web server comprises:
determining the total time Tn of all target slice files, determining the total time Tc required by generating the target slice files, and determining the generated time Ts of time shifting operation;
if Ts is greater than Tn + Tc, downloading all target slice files;
and if Ts is less than or equal to Tn + Tc, when the user indicates the time shifting end position point and the target slice file containing the time shifting end position point is downloaded, stopping downloading.
7. The method of claim 5 or 6, wherein performing time shifting operation in the plurality of target slice files according to a preset step size comprises:
and starting from the time shifting starting position point to the front, and respectively adopting corresponding time shifting frequency according to the distance between each target slice file and the time shifting starting position point to perform time shifting operation in the corresponding target slice file.
8. The method of claim 7, further comprising:
informing a time shifting starting position point indicated by a user to a network server, and triggering the network server to execute the following operations: judging whether an original slice file with the pause starting position point as a starting point exists in the generated original slice files or not based on the pause starting position point, if so, directly acquiring the original slice file as the pause slice file, otherwise, determining the starting point based on the pause starting position point, and re-slicing the video content behind the starting point to obtain the pause slice file;
and receiving a pause slice file issued by the network server, and starting to play the video content based on the pause slice file when the user indicates to finish pausing.
9. An apparatus for implementing a time shift function, comprising:
an obtaining unit, configured to determine a time shift starting position point indicated by a user based on a notification of a time shift terminal, and obtain N original slice files that are before the time shift starting position point and include the time shift starting position point, where N is a preset parameter, and the original slice files are obtained after slicing video content according to a system default duration;
the processing unit is used for dividing the N original slice files into a plurality of file groups, and slicing each file group again by adopting corresponding target time length to obtain a plurality of target slice files, wherein the target time length corresponding to one file group is positively correlated with the distance between the one file group and a time-shifting starting position point, and the target time length is less than the system default time length;
and the communication unit is used for sending the target slice files to the time shifting terminal and triggering the time shifting terminal to perform time shifting operation in the target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
10. An apparatus for implementing a time shift function, comprising:
a communication unit, configured to notify the network server of the time-shift starting location point indicated by the user, and trigger the network server to perform the following operations:
acquiring N original slice files containing the time-shifting starting position point before the time-shifting starting position point, dividing the N original slice files into a plurality of file groups, and re-slicing each file group by adopting corresponding target time length to acquire a plurality of target slice files, wherein the target time length corresponding to one file group is positively correlated with the distance between the one file group and the time-shifting starting position point, N is a preset parameter, the original slice files are files obtained by slicing video contents according to system default time length, and the target time length is less than the system default time length;
and the time shifting unit is used for receiving the target slice files issued by the network server and carrying out time shifting operation on the target slice files according to a preset step length until a time shifting starting end point indicated by a user is reached.
11. A computing device comprising a memory for storing program instructions and a processor for calling up program instructions stored in the memory to execute the method of any one of claims 1 to 4 in accordance with the program instructions obtained.
12. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 1-4.
13. A computing device comprising a memory for storing program instructions and a processor for calling up program instructions stored in the memory to execute the method of any one of claims 5 to 8 in accordance with the program instructions obtained.
14. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 5-8.
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| CN114417055A (en) * | 2021-12-28 | 2022-04-29 | 北京华夏电通科技股份有限公司 | Video playing method and device, computer equipment and storage medium |
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