CN112995649B - Network terminal and network terminal evaluating method - Google Patents
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- CN112995649B CN112995649B CN201911285090.2A CN201911285090A CN112995649B CN 112995649 B CN112995649 B CN 112995649B CN 201911285090 A CN201911285090 A CN 201911285090A CN 112995649 B CN112995649 B CN 112995649B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4383—Accessing a communication channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
Abstract
The application provides a network terminal and a network terminal evaluation method, which relate to the technical field of communication, and the method comprises the following steps: receiving a channel switching operation instruction for switching to a designated multicast program, and recording the triggering time of the channel switching operation instruction; determining a duration between the received first frame video data and the first I frame video data of the designated multicast program; recording a start display time of the first I-frame video data; and determining the time difference between the starting display time and the triggering time, and correcting the time difference according to the duration between the first frame of video data and the first I frame of video data to obtain the channel changing speed of the network terminal. By the method, accuracy of network terminal performance evaluation is further improved.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a network terminal and a network terminal evaluation method.
Background
In the related art, when evaluating the channel changing speed performance of a network terminal for a multicast program, a stopwatch or a timer is generally adopted to calculate the difference value between the stop static frame of the current program or the screen blackout and the output of the first frame picture of the next program, and the difference value is used as the channel changing speed of the multicast program. Further, to reduce the error, the average value may be calculated a plurality of times.
However, the accuracy of evaluating the performance of the network terminal by the method is low, and based on the accuracy, the embodiment of the application provides a network terminal evaluating method.
Disclosure of Invention
The invention provides a network terminal and a network terminal evaluating method, which can improve the accuracy of evaluating the network terminal.
According to an aspect in an exemplary embodiment, there is provided a network terminal, including: a display screen; an input unit configured to receive a user instruction;
and a processor, connected to the display screen and the input unit, configured to:
receiving a channel switching operation instruction for switching to a designated multicast program through the input unit, and recording the triggering time of the channel switching operation instruction;
receiving data of the designated multicast program through the input unit; and is combined with the other components of the water treatment device,
determining a duration between the received first frame video data and the first I frame video data of the designated multicast program;
recording a start display time of the first I-frame video data;
and determining the time difference between the starting display time and the triggering time, and correcting the time difference according to the duration between the first frame of video data and the first I frame of video data to obtain the channel changing speed of the network terminal.
The beneficial effects that this embodiment produced: the method eliminates the influence of the time length between the first frame of video data and the first I frame of video data on the channel changing speed of the network terminal, and further improves the evaluation accuracy of the network terminal.
In some exemplary embodiments, the processor is further configured to:
determining a start receiving time when the data of the designated multicast program starts to be received;
determining an I-frame image receiving time of receiving first I-frame video data of the designated multicast program;
a duration between the start receive time and the I-frame image receive time is determined.
The beneficial effects that this embodiment produced: the influence of the arrival time of the first I frame is removed, the influence of uncertainty of the arrival time of the I frame is eliminated, and the accuracy of evaluating the network terminal is further improved.
In some exemplary embodiments, the processor is further configured to:
determining a channel changing speed of the network terminal determined based on each channel changing operation instruction by triggering a plurality of channel changing operation instructions;
and taking the average value of a plurality of channel changing speeds as the final channel changing speed of the network terminal.
The beneficial effects that this embodiment produced: the error can be further reduced by calculating the average value for a plurality of times, and the accuracy of evaluating the channel changing speed is improved.
In some exemplary embodiments, the plurality of zapping instructions are zapping instructions for different multicast programs.
The beneficial effects that this embodiment produced: by the method, errors caused by the fact that the same multicast program is used after switching and before switching when the channel switching speed is evaluated can be avoided.
In some exemplary embodiments, the processor is further configured to:
and correcting the time difference by subtracting the time length between the first frame of video data and the first I frame of video data from the time difference between the starting display time and the triggering time.
The beneficial effects that this embodiment produced: by the method, the channel changing speed of the network terminal can be obtained more intuitively.
According to another aspect in the exemplary embodiment, there is provided a network terminal evaluating method, including:
receiving a channel switching operation instruction for switching to a designated multicast program, and recording the triggering time of the channel switching operation instruction;
determining a duration between the received first frame video data and the first I frame video data of the designated multicast program;
recording a start display time of the first I-frame video data;
and determining the time difference between the starting display time and the triggering time, and correcting the time difference according to the duration between the first frame of video data and the first I frame of video data to obtain the channel changing speed of the network terminal.
The beneficial effects that this embodiment produced: the method eliminates the influence of the time length between the first frame of video data and the first I frame of video data on the channel changing speed of the network terminal, and further improves the evaluation accuracy of the network terminal.
In some exemplary embodiments, the determining a duration between the received first frame video data and the first I frame video data of the specified multicast program includes:
determining a start receiving time when the data of the designated multicast program starts to be received;
determining an I-frame image receiving time of receiving first I-frame video data of the designated multicast program;
a duration between the start receive time and the I-frame image receive time is determined.
The beneficial effects that this embodiment produced: the influence of the arrival time of the first I frame is removed, the influence of uncertainty of the arrival time of the I frame is eliminated, and the accuracy of evaluating the network terminal is further improved.
In some exemplary embodiments, the method further comprises:
determining a channel changing speed of the network terminal determined based on each channel changing operation instruction by triggering a plurality of channel changing operation instructions;
and taking the average value of a plurality of channel changing speeds as the final channel changing speed of the network terminal.
The beneficial effects that this embodiment produced: the error can be further reduced by calculating the average value for a plurality of times, and the accuracy of evaluating the channel changing speed is improved.
In some exemplary embodiments, the plurality of zapping instructions are zapping instructions for different multicast programs.
The beneficial effects that this embodiment produced: by the method, errors caused by the fact that the same multicast program is used after switching and before switching when the channel switching speed is evaluated can be avoided.
In some exemplary embodiments, the determining the time difference between the start display time and the trigger time and correcting the time difference according to the duration between the first frame of video data and the first I frame of video data includes:
and correcting the time difference by subtracting the time length between the first frame of video data and the first I frame of video data from the time difference between the starting display time and the triggering time.
The beneficial effects that this embodiment produced: by the method, the channel changing speed of the network terminal can be obtained more intuitively.
According to yet another aspect of the exemplary embodiments, a computer storage medium is provided, in which computer executable instructions are stored, the computer executable instructions being configured to perform the network termination evaluation method described above.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, it being obvious that the drawings in the following description are some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 schematically illustrates a structural diagram of a network terminal provided in an embodiment of the present application;
fig. 2 schematically illustrates a multicast program zapping time;
FIG. 3 illustrates a schematic diagram of interactions between a network terminal and a server;
FIG. 4 is a schematic flow chart of a network terminal evaluation method;
FIG. 5 is a schematic flow chart of a network terminal evaluating method;
fig. 6 schematically illustrates a multicast program zapping time;
fig. 7 illustrates a schematic diagram of time of a multicast program zapping operation;
fig. 8 exemplarily shows a schematic structural diagram of a network terminal;
fig. 9 schematically shows a structural diagram of the network terminal evaluating device.
Detailed Description
The following description will be given in detail of the technical solutions in the embodiments of the present application with reference to the accompanying drawings. Wherein, in the description of the embodiments of the present application, "/" means or is meant unless otherwise indicated, for example, a/B may represent a or B; the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: the three cases where a exists alone, a and B exist together, and B exists alone, and in addition, in the description of the embodiments of the present application, "plural" means two or more than two.
The terms "first," "second," and the like, are used below for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Fig. 1 is a schematic structural diagram of a network terminal 100 according to an embodiment of the present application. The embodiment will be specifically described below taking the network terminal 100 as an example. It should be understood that the network terminal 100 shown in fig. 1 is only one example, and that the network terminal 100 may have more or fewer components than shown in fig. 1, may combine two or more components, or may have a different configuration of components. The various components shown in the figures may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and/or application specific integrated circuits.
A hardware configuration block diagram of the network terminal 100 according to an exemplary embodiment is exemplarily shown in fig. 1. As shown in fig. 1, the network terminal 100 includes: radio Frequency (RF) circuitry 110, memory 120, display unit 130, camera 140, sensor 150, audio circuitry 160, wireless fidelity (Wireless Fidelity, wi-Fi) module 170, processor 180, bluetooth module 181, and power supply 190.
The RF circuit 110 may be used for receiving and transmitting signals during the process of receiving and transmitting information or communication, and may receive downlink data of the base station and then transmit the downlink data to the processor 180 for processing; uplink data may be sent to the base station. Typically, RF circuitry includes, but is not limited to, antennas, at least one amplifier, transceivers, couplers, low noise amplifiers, diplexers, and the like.
Memory 120 may be used to store software programs and data. The processor 180 performs various functions of the network terminal 100 and data processing by running software programs or data stored in the memory 120. Memory 120 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. The memory 120 stores an operating system that enables the network terminal 100 to operate. The memory 120 in the present application may store an operating system and various application programs, and may also store code for performing the methods described in the embodiments of the present application.
The display unit 130 may be used to receive input digital or character information, generate signal inputs related to user settings and function control of the network terminal 100, and in particular, the display unit 130 may include a touch screen 131 provided at the front of the network terminal 100, and may collect touch operations on or near the user, such as clicking buttons, dragging scroll boxes, and the like.
The display unit 130 may also be used to display information input by a user or information provided to the user and a graphical user interface (Graphical User Interface, GUI) of various menus of the network terminal 100. In particular, the display unit 130 may include a display 132 disposed on the front side of the network terminal 100. The display 132 may be configured in the form of a liquid crystal display, light emitting diodes, or the like. The display unit 130 may be used to display various graphical user interfaces described in this application.
The touch screen 131 may cover the display screen 132, or the touch screen 131 and the display screen 132 may be integrated to implement the input and output functions of the network terminal 100, and the integrated touch screen may be simply referred to as a touch display screen. The display unit 130 may display an application program and corresponding operation steps.
The camera 140 may be used to capture still images or video. The object generates an optical image through the lens and projects the optical image onto the photosensitive element. The photosensitive element may be a charge coupled device (Charge Coupled Device, CCD) or a Complementary Metal Oxide Semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, which is then transferred to the processor 180 for conversion into a digital image signal.
The network terminal 100 may further include at least one sensor 150 such as an acceleration sensor 151, a distance sensor 152, a fingerprint sensor 153, a temperature sensor 154. The network terminal 100 may also be configured with other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, light sensors, motion sensors, and the like.
Audio circuitry 160, speaker 161, microphone 162 may provide an audio interface between a user and network terminal 100. The audio circuit 160 may transmit the received electrical signal converted from audio data to the speaker 161, and the speaker 161 converts the electrical signal into a sound signal and outputs the sound signal. The network terminal 100 may also be configured with a volume button for adjusting the volume of the sound signal. On the other hand, the microphone 162 converts the collected sound signal into an electrical signal, which is received by the audio circuit 160 and converted into audio data, which is output to the RF circuit 110 for transmission to, for example, another network terminal, or to the memory 120 for further processing. Microphone 162 may capture the voice of the user in this application.
Wi-Fi belongs to a short-range wireless transmission technology, and the network terminal 100 can help a user to send and receive e-mail, browse web pages, access streaming media and the like through the Wi-Fi module 170, so that wireless broadband internet access is provided for the user.
The processor 180 is a control center of the network terminal 100, connects various parts of the entire network terminal using various interfaces and lines, and performs various functions of the network terminal 100 and processes data by running or executing software programs stored in the memory 120, and calling data stored in the memory 120. In some embodiments, the processor 180 may include one or more processors; the processor 180 may also integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., and a baseband processor that primarily handles wireless communications. It will be appreciated that the baseband processor described above may not be integrated into the processor 180. The processor 180 may run an operating system, application programs, user interface displays and touch responses, and the processing methods described in the embodiments of the present application. In addition, the processor 180 is coupled with the input unit and the display unit 130. The input unit is configured to receive a user instruction.
The bluetooth module 181 is configured to perform information interaction with other bluetooth devices having a bluetooth module through a bluetooth protocol. For example, the network terminal 100 may establish a bluetooth connection with a wearable electronic device (e.g., a smart watch) also provided with a bluetooth module through the bluetooth module 181, thereby performing data interaction.
The network terminal 100 also includes a power supply 190 (e.g., a battery) that provides power to the various components. The power supply may be logically connected to the processor 180 through a power management system, so that functions of managing charge, discharge, power consumption, etc. are implemented through the power management system. The network terminal 100 may also be configured with a power button for power on and off, screen locking, etc. functions of the network terminal.
In the encoding of video, P-frames and B-frames are encoded based on the difference between the previous frame (P-frame) or the previous and subsequent frames (B-frames), except that the I-frame is a complete picture. Groups of pictures (Group of Pictures, GOP) are often referred to in video coding, a GOP being in effect a group of consecutive pictures. The length between two I frames is commonly referred to as GOP length, and if a video has a certain GOP length of 120 frames and the slice source is 60fps (i.e., 60 frames of pictures are transmitted per second), the time difference between two I frames is 2 seconds.
It should be noted that, for a performance index of a channel change speed of a multicast live program, a network terminal is usually indicated by calculating a difference between a stop (still frame or black screen) of a current program and a first frame of picture output of a next program by using a stopwatch or an instrument. To reduce the error, the average value may be calculated a plurality of times.
The inventor finds that the method cannot solve the error caused by the randomness of the channel change due to the length of the GOP of the live program. Especially in the case of small dynamic changes in the program images, a GOP length of up to 4 seconds is possible. If the method is adopted to evaluate the channel changing speed performance of the multicast program of a certain terminal, the maximum error can reach 4 seconds, and the error can not be removed to the maximum extent.
In general, the influence factors of the channel change time of the multicast program include the following aspects, as shown in fig. 2: the internet group management protocol (Internet Group Management Protocol, IGMP protocol) processes time T1n (time when a multicast program to be switched is added to a multicast group and a message that the multicast program addition is successful is transmitted to a terminal device), device processing time T2n (time when a network terminal reads data from a buffer), arrival time T3n of an I frame after a channel change (time difference between when a device receives non-I frame data and when it receives next I frame data), and decoding time T4n of the device (time when the network terminal decodes an I frame image).
As previously described, a stopwatch or instrument is typically used to calculate the difference in time between the stop still frame or black screen of the current program and the first frame picture output of the next program, and to reduce the error, the average value may be calculated multiple times, so as to evaluate the channel change speed of the network terminal (e.g., digital video conversion box). In fig. 3, the time to be considered in evaluating the network terminal zapping speed includes: after receiving the channel switching operation instruction for switching to the designated multicast program, the network terminal transmits the channel switching operation instruction to a server (such as a multicast switch, a source server and the like) for a time length (T1 n in fig. 2) through an IGMP protocol, the server adds the designated multicast program to the multicast group and transmits the multicast program to the network terminal so that the network terminal reads video data from a cache for the time length (T2 n in fig. 2), and the network terminal receives the first dataThe required duration of the I-frame video data is T3n in fig. 2, and the required duration of the network terminal for decoding the received first I-frame video data is T4n in fig. 2. Therefore, it can be known that the handoff speed of the network terminal is tn= (t1n+t2n+t3n+t4n), where n represents the number of times of handoff, T1, T2 … Tn are each the speed of each handoff, and in order to make the determined handoff speed more accurate, the average of the determined handoff speeds may be used to represent the final handoff speed, i.e. calculate the final handoff speedAs a final determined zapping speed, wherein T d Indicating the final zapping speed.
The longer the GOP length, the higher the compression ratio, and the longer the I-frame will be to the device after the zapping. In addition, the longer the GOP length of the same program content, the smaller the bandwidth occupied by the transmission process. In practical applications, the GOP length of many high definition programs is even up to 5 seconds. Case 1: if the zapping speed is 7 seconds, the arrival time of the I-frame actually takes 5 seconds (1 GOP length), accounting for 71.4%; case 2 if an I frame is received just after a zapping (without any waiting I frame time), the zapping speed is 2 seconds. Compared with the case 1, the channel switching speed is naturally improved by 71.4 percent (5 seconds), and the terminal to be evaluated does not perform any performance optimization in practice, but the channel switching time is different.
Since the live program is transmitted by the server in real time during the encoding process, the user datagram protocol (User Datagram Protocol, UDP) message transmitted by the server to the network terminal after the user has changed channels does not necessarily contain an I frame. As described above, the time to wait for an I frame to arrive after a handoff may reach 5 seconds in the worst case, but if the very first frame data is I frame data, the time to wait for an I frame is negligible. The performance of the network terminal is evaluated in the mode, so that a large error exists, and a novel network terminal evaluation method is provided based on the method for evaluating the network terminal so as to improve the accuracy of network terminal evaluation.
As described above, the performance evaluation of the network terminal multicast program channel switching speed is greatly affected by the factor of when the first I frame data arrives after the user operates, and because of the real-time property of the live program, the influence of the factor is random, which generates great uncertainty on the evaluation accuracy, and the terminal live program channel switching speed cannot be evaluated truly. Referring to fig. 4, a network terminal evaluating method provided in the embodiment of the present application may be applied to a network terminal playing a multicast program, for example: a digital video conversion box. After receiving the channel change operation of the multicast program triggered by the remote controller or other infrared devices, the method can execute:
step 401: and receiving a channel switching operation instruction for switching to the appointed multicast program, and recording the triggering time of the channel switching operation instruction, wherein the triggering time is assumed to be t1.
Step 402: a time period between the received first frame video data and the first I frame video data of the specified multicast program is determined, assuming the time period is Δt.
In one embodiment, a start reception time when data of the designated multicast program starts to be received may be determined first, then an I-frame image reception time when first I-frame video data of the designated multicast program is received may be determined, and finally a duration between the start reception time and the I-frame image reception time may be determined.
In particular, the first frame of video data is read by FFmpeg (FFmpeg is an open source computer program that can be used to record, convert digital audio and video into a stream) at time t2 (i.e. start time) in the processor of the network terminal, and when the first I frame is read at time t3, the channel change speed of the network terminal is corrected by calculating the difference between t2 and t3. In implementation, ffmpeg may be implemented by the following code, but the program code is not limited thereto, and any program code that can implement determining a duration between a start reception time and the I-frame image reception time is applicable to the present application.
After the channel change, the cache data is continuously read
While((av_read_frame(context,&InPack)>＝0))
{
Data decoding
Len＝avcodec_decode_video2(context,&outFrame,&nComplete,&InPack)；
Recording a time point t2; the function is performed only once, avoiding that I-frames are performed multiple times before arrival
Determining whether it is an I frame
If(nComplete>0&&outFrame.key_frame)
{
Recording a time point t3;
break; the/(jump-out while loop)
}
}
The difference between T2 and T3 is calculated, Δt=t3-T2.
In the program code, Δt is used as a correction value of the zapping speed.
By the method, the influence of the arrival time of the first I frame is removed, the influence of uncertainty of the arrival time of the I frame is eliminated, and the evaluation accuracy of the network terminal is further improved.
Step 403: the start display time of the first I-frame video data is recorded, assuming that the time is t4.
Step 404: and determining the time difference between the starting display time and the triggering time, and correcting the time difference according to the duration between the first frame of video data and the first I frame of video data to obtain the channel changing speed of the network terminal.
In one embodiment, the time difference is corrected by subtracting the time length between the first frame of video data and the first I frame of video data from the time difference between the start display time and the trigger time, i.e. t=t4-T1- Δt (where T represents the time point and T represents the time length). The value of T=t4-T1-deltaT is used as an evaluation standard for evaluating the network terminal channel changing speed. If T is large, the channel changing speed is low; if T is small, the channel changing speed is high; the absolute value of T is the relative value of the complete channel change time after the waiting I frame time is removed, and the channel change speed is evaluated through T, so that the channel change speed is more objective and accurate.
In addition, to make the determined zapping speed more accurate, an average of the multiple measurements may be used as the final zapping speed. For example, m measurements are taken together, m is a positive integer, and the average of the m measurements is determined to represent the final zapping speed.
In one embodiment, the channel change speed of the network terminal determined based on each channel change operation instruction can be determined by triggering a plurality of channel change operation instructions, and the average value of the channel change speeds is taken as the final channel change speed of the network terminal. The error can be further reduced by calculating the average value for a plurality of times, and the accuracy of evaluating the channel changing speed is improved.
In one embodiment, the plurality of zapping instructions are zapping instructions for different multicast programs. Such as: the evaluation of the channel change speed of the network terminal is to switch the multicast program 1 to the multicast program 2 instead of switching to the multicast program 1 again in the case of the currently playing multicast program 1.
By the method, errors caused by the fact that the same multicast program is used after switching and before switching when the channel switching speed is evaluated can be avoided.
The following describes in detail the steps of the flow shown in fig. 5, in step 501: and receiving a channel switching operation instruction for switching to the designated multicast program, counting the triggering time of the operation instruction as t1, and transmitting the channel switching operation instruction to the server.
Step 502: and the network terminal reads the cache data, wherein the cache data is transmitted after the server adds the designated multicast program into the multicast group.
Step 503: the buffered data is read in sequence, recording the time t2 of reading the first frame of video data (the recording time point is only operated 1 time, and no time is recorded for the second and subsequent data reading operations).
Step 504: whether the read video data is I-frame video data is determined, if so, step 505 is executed, and if not, step 503 is executed.
Step 505: the time for recording and reading the I-frame video data is t3.
Step 506: the I-frame video data is decoded and parsed into images at time t4.
It is known that the channel change operation time is t4-t1- (t 3-t 2). Fig. 6 shows a schematic diagram of a channel change operation after receiving the first frame of video data, which is not an I frame but a P frame, fig. 7 shows a schematic diagram of a channel change operation after receiving the first frame of video data, which is an I frame, and fig. 7 shows t2≡t3, where the difference between t3 and t2 is only the judgment time of the I frame in the above program code, and the value is very small.
Based on the same concept, as shown in fig. 8, an embodiment of the present application provides a terminal for reporting information, where the terminal includes: a processor 800 and a memory 801, wherein the processor 800 stores program code that, when executed by the processor 800, causes the terminal to:
receiving a channel switching operation instruction for switching to a designated multicast program, and recording the triggering time of the channel switching operation instruction;
determining a duration between the received first frame video data and the first I frame video data of the designated multicast program;
recording a start display time of the first I-frame video data;
and determining the time difference between the starting display time and the triggering time, and correcting the time difference according to the duration between the first frame of video data and the first I frame of video data to obtain the channel changing speed of the network terminal.
Optionally, the processor 800 is specifically configured to:
determining a start receiving time when the data of the designated multicast program starts to be received;
determining an I-frame image receiving time of receiving first I-frame video data of the designated multicast program;
a duration between the start receive time and the I-frame image receive time is determined.
Optionally, the processor 800 is specifically configured to:
determining a channel changing speed of the network terminal determined based on each channel changing operation instruction by triggering a plurality of channel changing operation instructions;
and taking the average value of a plurality of channel changing speeds as the final channel changing speed of the network terminal.
Optionally, the plurality of channel change operation instructions are channel change operation instructions for different multicast programs.
Optionally, the processor 800 is specifically configured to:
and correcting the time difference by subtracting the time length between the first frame of video data and the first I frame of video data from the time difference between the starting display time and the triggering time.
Referring to fig. 9, a network terminal evaluating device provided in an embodiment of the present application includes: a receiving module 91, a first determining module 92, a recording module 93 and a second determining module 94.
A receiving module 91, configured to receive a channel switching operation instruction for switching to a specified multicast program, and record a trigger time of the channel switching operation instruction;
a first determining module 92, configured to determine a duration between the received first frame video data and the first I frame video data of the specified multicast program;
a recording module 93, configured to record a start display time of the first I-frame video data;
a second determining module 94, configured to determine a time difference between the start display time and the trigger time, and correct the time difference according to a duration between the first frame of video data and the first I frame of video data, so as to obtain a channel changing speed of the network terminal.
In one implementation, the first determining module is specifically configured to:
determining a start receiving time when the data of the designated multicast program starts to be received;
determining an I-frame image receiving time of receiving first I-frame video data of the designated multicast program;
a duration between the start receive time and the I-frame image receive time is determined.
In one implementation, the apparatus further comprises: the third determining module is used for determining the channel changing speed of the network terminal determined based on each channel changing operation instruction by triggering a plurality of channel changing operation instructions;
and taking the average value of a plurality of channel changing speeds as the final channel changing speed of the network terminal.
In one embodiment, the plurality of zapping instructions are zapping instructions for different multicast programs.
In one embodiment, the second determining module is specifically configured to:
and correcting the time difference by subtracting the time length between the first frame of video data and the first I frame of video data from the time difference between the starting display time and the triggering time.
Since the network terminal and the computer storage medium in the embodiments of the present invention may be applied to the above-mentioned processing method, the technical effects that can be obtained by the network terminal and the computer storage medium may also refer to the above-mentioned method embodiments, and the embodiments of the present invention are not described herein again.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (8)
1. A network terminal, the network terminal comprising:
a display screen;
an input unit configured to receive a user instruction;
and a processor, connected to the display screen and the input unit, configured to:
receiving a channel switching operation instruction for switching to a designated multicast program through the input unit, and recording the triggering time of the channel switching operation instruction;
receiving data of the designated multicast program through the input unit; and is combined with the other components of the water treatment device,
determining a duration between the received first frame video data and the first I frame video data of the designated multicast program;
recording a start display time of the first I-frame video data;
and correcting the time difference by subtracting the time length between the first frame of video data and the first I frame of video data from the time difference between the starting display time and the triggering time, so as to obtain the channel changing speed of the network terminal.
2. The network terminal of claim 1, wherein the processor is configured to:
determining a start receiving time when the data of the designated multicast program starts to be received;
determining an I-frame image receiving time of receiving first I-frame video data of the designated multicast program;
a duration between the start receive time and the I-frame image receive time is determined.
3. The network terminal of claim 1, wherein the processor is configured to:
determining a channel changing speed of the network terminal determined based on each channel changing operation instruction by triggering a plurality of channel changing operation instructions;
and taking the average value of a plurality of channel changing speeds as the final channel changing speed of the network terminal.
4. A network terminal according to claim 3, wherein the plurality of zapping instructions are zapping instructions for different multicast programs.
5. The network terminal evaluating method is characterized by comprising the following steps:
receiving a channel switching operation instruction for switching to a designated multicast program, and recording the triggering time of the channel switching operation instruction;
determining a duration between the received first frame video data and the first I frame video data of the designated multicast program;
recording a start display time of the first I-frame video data;
and correcting the time difference by subtracting the time length between the first frame of video data and the first I frame of video data from the time difference between the starting display time and the triggering time, so as to obtain the channel changing speed of the network terminal.
6. The method of claim 5, wherein said determining the duration between the received first frame video data and the first I frame video data of the specified multicast program comprises:
determining a start receiving time when the data of the designated multicast program starts to be received;
determining an I-frame image receiving time of receiving first I-frame video data of the designated multicast program;
a duration between the start receive time and the I-frame image receive time is determined.
7. The method of claim 5, wherein the method further comprises:
determining a channel changing speed of the network terminal determined based on each channel changing operation instruction by triggering a plurality of channel changing operation instructions;
and taking the average value of a plurality of channel changing speeds as the final channel changing speed of the network terminal.
8. The method of claim 5, wherein the plurality of zapping instructions are zapping instructions for different multicast programs.
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