CN105491461B - A kind of video transmission method - Google Patents
A kind of video transmission method Download PDFInfo
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Abstract
This application discloses a kind of video transmission methods, including：Corresponding benchmark code rate and lowest bit rate are set for every kind of resolution format in advance, corresponding benchmark frame per second and minimum frame per second are set for the rate travel of different stage.The periodically current maximum traffic rate CR for eating dishes without rice or wine to support of monitoringUU_Current, and it is being unable to satisfy CRUU_CurrentWhen the demand of current code rate, according to lowest bit rate, current code rate and the CR under current video formatUU_CurrentRelationship, to resolution ratio, code rate and frame per second carry out structure adjusting.Using the application, appropriate adjustment can be carried out to transmission of video, to reduce the influence for transmitted video to the greatest extent to greatest extent using the remaining bandwidth eated dishes without rice or wine.
Description
Technical field
This application involves the communication technology, in particular to a kind of video transmission method.
Background technique
With the rapid development of wireless technology, wireless application scene constantly extends, and more and more fields are needed using nothing
Line networking is transmitted to complete corresponding information, including data service, voice service etc., especially utilizes nothing in some specialized fields
Line+wired mixing or independence networking carry out scene monitoring, real-time video transmission etc..And a root problem of wireless network is
With covering, capacity, interference variation, transmittability can change, need to examine in practical application especially mobile context
Consider influence of such variation to institute's transmission services.
In the prior art, for the transmission of video under mobile condition, individually adjusting resolution ratio will affect certain large screens
The display effect of scene；Individually adjusting frame per second will affect fluency under certain mobile contexts, and individually adjusting code rate will appear biography
Defeated information content is unsatisfactory for the requirement of the clarity under given resolution.Therefore under wireless scene, integrated survey user personality is needed, is moved
State selects suitable Developing Tactics transmission of video, to meet transmission demand to greatest extent.
Summary of the invention
The application provides a kind of video transmission method, can rationally carry out the adjustment of transmission of video, to the greatest extent under wireless scene
Amount reduces the influence for transmitted video.
To achieve the above object, the application adopts the following technical scheme that：
A kind of video transmission method, including：
Corresponding benchmark code rate and lowest bit rate are set for every kind of resolution format in advance, for the movement of different stage
Corresponding benchmark frame per second and minimum frame per second is arranged in rate；
The current code rate of video is transmitted in the periodical current rate travel for monitoring mobile device, mobile device
CRCurrent_m, current resolution format m and currently eat dishes without rice or wine support maximum traffic rate CRUU_Current；It determines described when Forward
The dynamic corresponding benchmark frame per second F of rateBase_n；
As the CRUU_CurrentMeet the lowest bit rate CR under current video format m described in conditionMin_m≤CRUU_Current<
CRCurrent_mWhen, the target frame rate of the transmission video is reduced until the corresponding minimum frame per second F of current rate travelMin_n, and will
Target bit rate is set as the CRUU_Current, maintain resolution format constant；
As the CRUU_CurrentMeet condition C RUU_Current<CRMin_mWhen, by the target resolution lattice of the transmission video
Formula is reduced to benchmark code rate closest to CRUU_CurrentResolution format m', and determine corresponding target bit rate and target frame rate；
The target resolution format, target bit rate and target frame rate are sent to the transmission video by the mobile device
Receiving end, if the receiving end feedback support issue each target value, by it is described transmission video resolution format, code
Rate and frame per second adjust separately as corresponding target value；Otherwise, the code rate of the transmission video is adjusted to min [CRUU_Current,
CRMin_m]；
Transmission of video is carried out according to resolution format adjusted, code rate and frame per second.
Preferably, keeping the frame per second of I frame constant when reducing the target frame rate, reducing the frame per second of non-I frame.
Preferably, the target frame rate for reducing the transmission video is until the corresponding minimum frame per second of current rate travel
FMin_nIncluding：
Calculate prediction frame per second
FPred=1+ (CRUU_Current-(CRCurrent_I_frame+ΔCRI_Compensate))/CRPred_PB_frame+Δ
FCompensate；If the prediction frame per second FPredThe corresponding minimum frame per second F of the current rate travel of >=mobile deviceMin_n, then
The target frame rate of the transmission video is set as the prediction frame per second；If the prediction frame per second FPred<FMin_n, then by the biography
The target frame rate of defeated video is set as FMin_n；
Wherein, CRPred_PB_frame=(CRCurrent_m-CRCurrent_I_frame)/((FCurrent*ΔTI_Frame) -1),
CRCurrent_I_frameFor current resolution current frame rate FCurrentThe Mean Speed of lower I frame, Δ TI_FrameFor the time of I frame period
Length, Δ CRI_CompensateFor I frame code rate offset, Δ FCompensateFor frame per second offset.
Preferably, the target resolution format that will transmit video is reduced to benchmark code rate closest to CRUU_Current's
Resolution format m' simultaneously determines corresponding target bit rate and target frame rate includes：
In benchmark code rate≤CRUU_CurrentResolution format in select optimal resolution format m', by the transmission
The target resolution Format adjusting of video is m', and target frame rate is set as the corresponding benchmark frame per second of the present rate, will
Target bit rate is set as the benchmark code rate under the resolution format m '；Benchmark code rate≤CR if it does not existUU_CurrentResolution
Rate format is then meeting condition minimum code rate<CRUU_Current<Optimal resolution ratio is selected in the resolution format of benchmark code rate
Format m', the target resolution Format adjusting by the transmission video is m', and target bit rate is set as CRUU_Current, and root
According to the CRUU_CurrentMinimum frame per second corresponding with the current rate travel reduces target frame rate.
Preferably, keeping the frame per second of I frame constant when reducing the target frame rate, reducing the frame per second of non-I frame.
Preferably, benchmark code rate≤CR if it does not existUU_CurrentResolution format, then the reduction target frame rate packet
It includes：
The target frame rate is set as to predict frame per second FPred=Max [FPred',FMin_n]；Wherein, FPred'=1+
(CRUU_Current-(CRCurrent_I_frame+ΔCRI_Compensate))/CRPred_PB_frame+ΔFCompensate, CRPred_PB_frame=
(CRUU_Current-CRCurrent_I_frame)/((FBase_n*ΔTI_Frame) -1), CRCurrent_I_frameFor current resolution current frame rate
FCurrentThe Mean Speed of lower I frame, Δ TI_FrameFor the time span of I frame period, Δ CRI_CompensateFor I frame code rate offset,
ΔFCompensateFor frame per second offset.
Preferably, working as the CRUU_CurrentMeet condition C RUU_Current>CRCurrent_mWhen, this method further comprises：
If current frame rate FCurrent<FBase_n, then keep resolution format constant, target bit rate be set as Min
[CRUU_Current,CRBase_m], and according to the CRUU_CurrentBenchmark frame per second corresponding with the current rate travel calculates target
Frame per second；
If current frame rate FCurrent=FBase_nAnd CRUU_CurrentBenchmark code rate CR under≤current resolution formatBase_m,
It then keeps resolution format and frame per second constant, target bit rate is set as Min [CRUU_Current,CRBase_m]；
If current frame rate FCurrent=FBase_nAndCRUU_Current>CRBase_m, then it is m+1 by target resolution format setting,
Target bit rate is set as Min [CRUU_Current,CRMax_m+1], and according to CRUU_CurrentIt is corresponding with the current rate travel
Benchmark frame per second calculates target frame rate.
Preferably, keeping the frame per second of I frame constant when calculating the target frame rate.
Preferably, if current frame rate FCurrent<FBase_n, the calculating target frame rate is：FPred=Min [FPred,FMax_n]；
Wherein,
FPred=1+ (CRUU_Current-(CRCurrent_I_frame+ΔCRI_Compensate))/CRPred_PB_frame+Δ
FCompensate, CRPred_PB_frame=(CRUU_Current-CRCurrent_I_frame)/((FCurrent*ΔTI_Frame) -1),
CRCurrent_I_frameFor current resolution current frame rate FCurrentThe Mean Speed of lower I frame, Δ CRI_CompensateFor I frame code rate benefit
Repay value, Δ FCompensateFor frame per second offset, FCurrentFor the current frame rate of the transmission video, FMax_nWork as to be pre-set
The corresponding maximum frame per second of preceding rate travel.
Preferably, if current frame rate FCurrent=FBase_nAnd CRUU_Current>CRBase_m, the calculating target frame rate is：
FPred=Min [FPred,FMax_n]；Wherein,
CRPred_PB_frame=(CRUU_Current-CRCurrent_I_frame)/((FBase_n*ΔTI_Frame) -1),
CRCurrent_I_frameFor current resolution current frame rate FCurrentThe Mean Speed of lower I frame, Δ CRI_CompensateFor I frame code rate benefit
Repay value, Δ FCompensateFor frame per second offset, FMax_nFor the corresponding maximum frame per second of pre-set current rate travel.
Preferably, the mobile device is by the SPS mechanism of codec or SIP signaling by the target resolution lattice
Formula, target bit rate and target frame rate are sent to the receiving end of the transmission video.
Preferably, this method further comprises：Before transmitting video, the mobile device is sent certainly to the receiving end
The resolution format and frame per second that body is supported, and receive the resolution format and frame per second of the receiving end support of the receiving end feedback.
As seen from the above technical solution, in the application, corresponding benchmark code rate is set for every kind of resolution format in advance
And lowest bit rate, for the rate travel of different stage, corresponding benchmark frame per second and minimum frame per second are set.Periodically monitoring is current
Eat dishes without rice or wine the maximum traffic rate CR supportedUU_Current, and it is being unable to satisfy CRUU_CurrentWhen the demand of current code rate, according to current
Lowest bit rate, current code rate and CR under video formatUU_CurrentRelationship, comprehensive tune is carried out to resolution ratio, code rate and frame per second
It is whole, to adapt transmission of video to the maximum traffic rate CR for currently eating dishes without rice or wine to supportUU_Current.To utilize sky to greatest extent
The remaining bandwidth of mouth carries out appropriate adjustment to transmission of video, to reduce the influence for transmitted video to the greatest extent.
Detailed description of the invention
Fig. 1 is the basic procedure schematic diagram of video transmission method in the application.
Specific embodiment
In order to which the purpose, technological means and advantage of the application is more clearly understood, the application is done below in conjunction with attached drawing
It is further described.
Under wireless transmission environments, when the remaining bandwidth eated dishes without rice or wine can not support the target bit rate of current video stream, need into
The adjustment of row transmission of video, which needs to save and is adapted to interface-free resources, while guaranteeing video transmission quality.In the application,
Adjustment process follows following principle：
According to user, current practical rate travel determines current frame per second adjusting range；
Frame per second is preferentially reduced, reaching does not influence fluency, is adapted to ability of eating dishes without rice or wine, and guarantees clarity；
When frame per second is minimized, resolution ratio is maintained, preferentially adjusts code rate, is adapted to ability of eating dishes without rice or wine；
Frame per second, which is minimized, adjusts code rate is still not enough to match ability of eating dishes without rice or wine, and reduces resolution ratio, and adjust frame per second simultaneously
And code rate；
It eats dishes without rice or wine capability improving, preferentially improves frame per second, guarantee to stablize transmission；
It eats dishes without rice or wine capability improving, frame per second reaches maximum, promotes resolution ratio.
The video transmission method in the application is described in detail below.
Fig. 1 is the basic procedure schematic diagram of video transmission method in the application.As shown in Figure 1, this method includes：
Step 101, corresponding benchmark code rate and lowest bit rate are set for every kind of resolution format in advance, for not at the same level
Corresponding benchmark frame per second and minimum frame per second is arranged in other rate travel.
In this step, rate travel is classified, corresponding benchmark frame per second and most under different stage rate travel is set
Small frame per second requirement.Specifically, N can be setVelocityGrade rate travel thresholding VThred_n, rate threshold increases V step by stepThred_n-1
<=VThred_n；Mobile subscriber in corresponding each rank, is arranged benchmark frame per second FBase_n, as allow under the same level rate travel
Adjust to maximum frame per second, benchmark frame per second increases F step by stepBase_n-1<=FBase_n；Mobile subscriber in corresponding each rank, if
Set minimum frame per second FMin_n, i.e., allow to adjust under the same level rate travel to minimum frame per second, minimum frame per second increases F step by stepMin_n-1<
=FMin_n, the minimum frame per second with level-one should be no more than benchmark frame per second FMin_n<=FBase_n.One is defined for all rate travels
A initial frame per second is FInit.Wherein, n ∈ [1, NVelocity].Furthermore it is preferred that the shifting of each rank can also be corresponded to further
Corresponding maximum frame per second F is arranged in dynamic rateMax_n, in general, FBase_n<=FMax_n。
It is required according to current scene and capacity of equipment (being obtained by SIP signaling negotiation) confirms available resolution format,
And the benchmark code rate under each format and minimum code rate requirement are set.Wherein, available resolution format can be sent by video
The signaling negotiation between receiving end is held to determine.It is assumed that determining MResolutionA video resolution format, from 1 to MResolution,
Resolution ratio is gradually increased；In initial frame per second FInitUnder, define the benchmark code rate CR of each resolution format mBase_mAnd meets and be somebody's turn to do
The minimum code rate CR of resolution ratio clarity demandMin_m, wherein m ∈ [1, MResolution].Here, benchmark code rate, which can be, meets phase
It answers resolution ratio clarity and is not in the code rate of blocking artifact.Resolution format is from 1 to MResolution, the more big corresponding view of m
Frequency clarity is higher, and code rate requires higher；Under same resolution ratio, CRMin_m<=CRBase_m.Wherein, scene can be according to reality
Classify.
When transmission of video starts, need to initialize the relevant parameter of transmission of video.Initial resolution can be
The specified resolution ratio of current scene, initial bit rate are the corresponding benchmark code rate of current rate travel, i.e. CRInit_m=CRBase_m, just
Beginning frame per second is FInitFrame/s.The time span Δ T of initial I frame periodI_FrameS, it is preferable that maintain I frame period during the adjustment
Duration is constant.
In an initial condition, it can not know the condition of eating dishes without rice or wine, at this moment non-I frame average bit rate is estimated as follows：
The time span Δ T of I frame periodI_FrameIn the case that s is constant, drop frame per second mainly reduces P frame and B frame, then closely
It is about like the single video frame Mean Speed for calculating non-I frame：
CRPred_PB_frame=(CRCurrent-CRCurrent_I_frame)/((FCurrent*ΔTI_Frame) -1), wherein
CRCurrent_I_frameFor the Mean Speed of I frame under current resolution current frame rate, can be obtained by data statistics.
Next, in real-time video transmission, it can be by the processing of step 102~107, according to condition week of currently eating dishes without rice or wine
Carry out to phase property the adjustment of transmission of video.
Step 102, the current rate travel of cycle monitoring mobile device, video is transmitted in mobile device current code rate,
The current resolution format m and maximum traffic rate CR supported that eats dishes without rice or wineUU_Current。
During carrying out transmission of video, the current rate travel for sending the mobile device of video is periodically monitored
VCurrent, currently eat dishes without rice or wine available bandwidth CRUU_Current', the business code rate under current video resolution format and the resolution format
CRCurrent_m。
Further, according to the corresponding relationship and current rate travel being arranged in step 101, current rate travel institute is determined
In the corresponding benchmark code rate of rank and lowest bit rate.To the available bandwidth CR that eats dishes without rice or wineUU_Current' carry out conversion determination currently eat dishes without rice or wine to prop up
The maximum traffic rate CR heldUU_Current=CRUU_Current' * (1-1/K), wherein K is commutation factor.
After the maximum traffic rate for determining to eat dishes without rice or wine to support, rate CR may find thatUU_CurrentIt can not support to pass
The current code rate CR of defeated videoCurrent_m, i.e. CRUU_Current<CRCurrent_m, then it represents that it eats dishes without rice or wine to deteriorate, be adjusted
It is whole.According to CRUU_CurrentWith the lowest bit rate CR under current video format mMin_mRelationship, can be using step 103 and 104
Processing is adjusted.
Step 103, work as CRMin_m≤CRUU_Current<CRCurrent_mWhen, the target frame rate of transmission video is reduced until current
The corresponding minimum frame per second F of rate travelMin_n, and target bit rate is set as CRUU_Current, maintain resolution format constant.
When being specifically adjusted, target bit rate, target frame rate and target resolution lattice are determined according to the present situation first
Formula, then transmitting terminal and receiving end are negotiated, if can support corresponding target value, if receiving end is agreed to, both sides according to
The adjustment of target value progress current video transmission；If receiving end is refused, code rate is individually adjusted.Therefore, this step and step
Processing in 104 is the processing of determining target value.
In this step 103, CRUU_CurrentMeet condition C RMin_m≤CRUU_Current<CRCurrent_m, then show current sky
Although a mouthful rate cannot support current code rate, the lowest bit rate under current resolution format can be supported, in this condition
Under, resolution format can be kept constant, setting target bit rate is the maximum traffic rate CR for eating dishes without rice or wine to supportUU_Current, reduce
Target frame rate.Specifically, target frame rate can be preferentially reduced, under the premise of holding does not influence fluency, is adapted to air interface transmission energy
Power sets CR for code rateUU_Current, guarantee clarity；When eating dishes without rice or wine constantly to deteriorate, i.e. CRUU_CurrentIt, can when continuing to reduce
To continue to reduce target frame rate, until target frame rate is adjusted to the corresponding minimum frame per second of current rate travel.Preferably, it is dropping
When low target frame per second, keeps the frame per second of I frame constant, reduce the frame per second of non-I frame.
In more detail, when reducing target frame rate, prediction frame per second is calculated first：
FPred=1+ (CRUU_Current-(CRCurrent_I_frame+ΔCRI_Compensate))/CRPred_PB_frame+Δ
FCompensate, wherein CRCurrent_I_frameFor current resolution current frame rate FCurrentThe Mean Speed of lower I frame, Δ TI_FrameFor
The time span of I frame period, Δ CRI_CompensateFor I frame code rate offset, Δ FCompensateFor frame per second offset.Δ
CRI_CompensateWith Δ FCompensateIt is preset value, it is preferable that can be and adjustment is optimized according to emulation or measured value；Just
Initial value can be set to 0.
If predicting frame per second FPredThe corresponding minimum frame per second F of >=current rate travelMin_n, then it is pre- target frame rate to be set as this
Survey frame per second FPred；If predicting frame per second FPred<FMin_n, then target frame rate is set as FMin_n。
Step 104, work as CRUU_Current<CRMin_mWhen, the target resolution format for transmitting video is reduced to benchmark code rate
Closest to CRUU_CurrentResolution format m', and determine corresponding target bit rate and target frame rate.
Work as CRUU_Current<CRMin_mWhen, illustrate that current resolution format can no longer meet transmission demand, it is necessary to which drop is differentiated
Rate format；After lowering resolution format, whole code rate can be reduced, to guarantee the preferable quality under current resolution format,
In the supported situation of bandwidth of air-interface, as far as possible using the benchmark frame per second and code rate under current code rate.
In more detail, in benchmark code rate≤CRUU_CurrentResolution format in select optimal resolution format m', will
Target resolution Format adjusting is m', and using the corresponding benchmark frame per second of current rate travel as target frame rate, by resolution ratio lattice
Benchmark code rate under formula m ' is as target bit rate.Wherein, timing under resolution format is carried out, can be lowered step by step, in this way when looking for
To first benchmark code rate≤CRUU_CurrentResolution format be m'.
Benchmark code rate≤CR if it does not existUU_CurrentResolution format, then in the minimum code rate of resolution format<
CRUU_Current<Optimal resolution format m' is selected in the resolution format of the benchmark code rate of resolution format, and target is differentiated
Rate Format adjusting is m', and target bit rate is set as CRUU_Current, and according to CRUU_CurrentIt is corresponding with current rate travel most
Small frame per second reduces target frame rate.Wherein, timing under resolution format is carried out, can be lowered step by step, it is full when finding first in this way
Sufficient condition minimum code rate<CRUU_Current<The resolution format of benchmark code rate is m'.When calculating target frame rate, it is preferable that
Keep the frame per second of I frame constant.
In more detail, prediction frame per second F is calculatedPredWhen, and using the prediction frame per second as target frame rate.Wherein, frame per second is predicted
FPred=Max [FPred',FMin_n]；
Wherein, FPred'=1+ (CRUU_Current-(CRCurrent_I_frame+ΔCRI_Compensate))/CRPred_PB_frame+Δ
FCompensate, CRPred_PB_frame=(CRUU_Current-CRCurrent_I_frame)/((FBase_n*ΔTI_Frame) -1), FBase_nTo work as
The corresponding benchmark frame per second of preceding rate travel.
Step 105, the target frame rate determined, target bit rate and target resolution are sent to reception by video sending end
End.
Step 106, transmitting terminal receives the feedback of receiving end, when receiving end, which is fed back, to be supported, by the frame per second of transmission of video, code
Rate and resolution format are adjusted to corresponding target value；When receive feedback do not support or failure when, keep resolution format and
Frame per second is constant, and code rate is adjusted to min [CRUU_Current,CRMin_m]。
In the processing of above-mentioned steps 105~106, the interaction of transmitting terminal and receiving end can use the SPS machine of codec
System is to realize.It is preferred that the processing of step 105~106 can also be realized by SIP signaling.
Step 107, transmitting terminal carries out transmission of video according to resolution format adjusted, frame per second and code rate.
So far, video transmission method process basic in the application terminates.Above-mentioned process be by taking a monitoring cycle as an example,
Introduce when eat dishes without rice or wine worsening condition when, the adjustment process of transmission of video.On the basis of above-mentioned basic procedure, based on each monitoring week
The condition of eating dishes without rice or wine of phase monitoring can also continue to gradually adjust frame per second, code rate and resolution ratio lattice after condition recovery is eated dishes without rice or wine in discovery
Formula, to obtain more high quality transmission video.
During carrying out the up-regulation of transmission video relevant parameter, in order to avoid the influence for fluctuation of eating dishes without rice or wine, lowered in reduction
Stringenter, the adjustment without leapfrog resolution format is relatively lowered in whole table tennis, up-regulation；Every class resolution ratio format is guaranteeing currently
Carry out the upward adjustment of resolution format under resolution format in the case where maximal rate maximum frame rate stable again.
Specifically, condition recovery of eating dishes without rice or wine is found in periodical monitoring process, that is, determines CRUU_CurrentMeet condition
CRUU_Current>CRCurrent_mAfterwards, it can correspondingly be adjusted according to current frame rate and code rate：
If 1) current frame rate FCurrent<Current rate travel FBase_n, then target frame rate is adjusted, and do not reach movement in frame per second
Before the corresponding maximum frame per second of rate, without leapfrog resolution adjustment.Specifically, keep resolution format constant, by object code
Rate is set as Min [CRUU_Current,CRBase_m], and according to CRUU_CurrentBenchmark frame per second corresponding with current rate travel calculates
Target frame rate；Keep the frame per second of I frame constant when wherein target frame rate calculates, calculating target frame rate is the frame for calculating and eating dishes without rice or wine to support
Rate：FPred=Min [FPred,FMax_n]；Wherein,
FPred=1+ (CRUU_Current-(CRCurrent_I_frame+ΔCRI_Compensate))/CRPred_PB_frame+Δ
FCompensate, CRPred_PB_frame=(CRUU_Current-CRCurrent_I_frame)/((FCurrent*ΔTI_Frame)-1).In above formula,
FMax_nFor the corresponding maximum frame per second of current rate travel being preferably provided in abovementioned steps 101.
If 2) current frame rate FCurrent=FBase_nAnd CRUU_CurrentBenchmark code rate under≤current resolution format
CRBase_m, then keep resolution format and frame per second constant, target bit rate be only set as Min [CRUU_Current,CRBase_m]；
If 3) current frame rate FCurrent=FBase_nAnd CRUU_Current>CRBase_m, then it needs to raise resolution format, it will
Target resolution format setting is m+1, and target bit rate is set as Min [CRUU_Current,CRMax_m+1], and according to CRUU_Current
Benchmark frame per second corresponding with current rate travel calculates target frame rate.Keep the frame per second of I frame constant when wherein target frame rate calculates,
Calculate target frame rate FPred=Min [FPred,FMax_n]；Wherein,
CRPred_PB_frame=(CRUU_Current-CRCurrent_I_frame)/((FBase_n*ΔTI_Frame)-1).In above formula, FMax_n
For the corresponding maximum frame per second of current rate travel being preferably provided in abovementioned steps 101.
After determining target bit rate, target frame rate and target resolution format in the manner described above, it can continue to execute
The processing of step 105~107 carries out transmission of video.
In addition, as previously mentioned, the transmission of video adjustment process after above-mentioned eat dishes without rice or wine worsening condition or recovery of eating dishes without rice or wine is with one
It is illustrated for the processing of monitoring cycle.In actual video transmission services, when business is initially set up, it can send
Capability negotiation, the supported resolution ratio in confirmation both ends and frame per second are carried out between end and receiving end, in the adjustment of subsequent video transmission
In the process, selection adjustment can be carried out in the resolution ratio and frame per second that both sides support.Concrete ability negotiations process can be：
1) transmitting terminal, which is sent by SIP signaling etc. to receiving end, negotiates request, carries resolution ratio and frame that transmitting terminal is supported
Rate；2) transmitting terminal receives the negotiation response of receiving end feedback by SIP signaling etc., can carry receiving end support in the response
Resolution ratio and frame per second.In this way, transmitting-receiving both ends can confirm the resolution ratio and frame per second that both sides support jointly.
Above-mentioned is the specific implementation of video transmission method in the application.It, can be according to real-time change by above-mentioned processing
Condition of eating dishes without rice or wine, structure adjusting frame per second, code rate and resolution ratio, to greatest extent using the remaining bandwidth eated dishes without rice or wine, to transmission of video into
Row appropriate adjustment, to reduce the influence for transmitted video to the greatest extent.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (12)
1. a kind of video transmission method, which is characterized in that including：
Corresponding benchmark code rate and lowest bit rate are set for every kind of resolution format in advance, for the rate travel of different stage
Corresponding benchmark frame per second and minimum frame per second are set；
The current code rate CR of video is transmitted in the periodical current rate travel for monitoring mobile device, mobile deviceCurrent_m, when
The preceding resolution format m and maximum traffic rate CR supported that currently eats dishes without rice or wineUU_Current；Determine that the current rate travel is corresponding
Benchmark frame per second FBase_n；
As the CRUU_CurrentMeet the lowest bit rate CR under current resolution format m described in conditionMin_m≤CRUU_Current<
CRCurrent_mWhen, the target frame rate of the transmission video is reduced until the corresponding minimum frame per second F of current rate travelMin_n, and will
Target bit rate is set as the CRUU_Current, maintain resolution format constant；
As the CRUU_CurrentMeet condition C RUU_Current<CRMin_mWhen, the target resolution format of the transmission video is dropped
Low is benchmark code rate closest to CRUU_CurrentResolution format m', and determine corresponding target bit rate and target frame rate；
The target resolution format, target bit rate and target frame rate are sent to connecing for the transmission video by the mobile device
Receiving end, if receiving end feedback supports each target value issued, by the transmission resolution format of video, code rate and
Frame per second adjusts separately as corresponding target value；Otherwise, the code rate of the transmission video is adjusted to min [CRUU_Current,
CRMin_m], keep resolution format and frame per second constant；
Transmission of video is carried out according to resolution format adjusted, code rate and frame per second.
2. the method according to claim 1, wherein keeping the frame per second of I frame not when reducing the target frame rate
Become, reduces the frame per second of non-I frame.
3. according to the method described in claim 2, it is characterized in that, the target frame rate for reducing the transmission video is until working as
The corresponding minimum frame per second F of preceding rate travelMin_nIncluding：
Calculate prediction frame per second
FPred=1+ (CRUU_Current-(CRCurrent_I_frame+△CRI_Compensate))/CRPred_PB_frame+△FCompensate；If institute
State prediction frame per second FPredThe corresponding minimum frame per second F of the current rate travel of >=mobile deviceMin_n, then by the transmission video
Target frame rate be set as the prediction frame per second；If the prediction frame per second FPred<FMin_n, then by the target frame of the transmission video
Rate is set as FMin_n；
Wherein, CRPred_PB_frame=(CRCurrent_m-CRCurrent_I_frame)/((FCurrent*△TI_Frame) -1),
CRCurrent_I_frameFor current resolution current frame rate FCurrentThe Mean Speed of lower I frame, △ TI_FrameFor the time of I frame period
Length, △ CRI_CompensateFor I frame code rate offset, △ FCompensateFor frame per second offset.
4. the method according to claim 1, wherein the target resolution format that will transmit video is reduced to
Benchmark code rate is closest to CRUU_CurrentResolution format m' and determine corresponding target bit rate and target frame rate includes：
In benchmark code rate≤CRUU_CurrentResolution format in select optimal resolution format m', by the transmission video
Target resolution Format adjusting is m', and target frame rate is set as the corresponding benchmark frame per second of the current rate travel, by mesh
Coding rate is set as the benchmark code rate under the resolution format m '；Benchmark code rate≤CR if it does not existUU_CurrentResolution ratio
Format is then meeting condition lowest bit rate<CRUU_Current<Optimal resolution ratio lattice are selected in the resolution format of benchmark code rate
Formula m', the target resolution Format adjusting by the transmission video is m', and target bit rate is set as CRUU_Current, and according to
The CRUU_CurrentMinimum frame per second corresponding with the current rate travel reduces target frame rate.
5. according to the method described in claim 4, it is characterized in that, keeping the frame per second of I frame not when reducing the target frame rate
Become, reduces the frame per second of non-I frame.
6. according to the method described in claim 5, it is characterized in that, benchmark code rate≤CR if it does not existUU_CurrentResolution ratio lattice
Formula, then the reduction target frame rate include：
The target frame rate is set as to predict frame per second FPred=Max [FPred',FMin_n]；Wherein, FPred'=1+
(CRUU_Current-(CRCurrent_I_frame+△CRI_Compensate))/CRPred_PB_frame+△FCompensate, CRPred_PB_frame=
(CRUU_Current-CRCurrent_I_frame)/((FBase_n*△TI_Frame) -1), CRCurrent_I_frameFor current resolution current frame rate
FCurrentThe Mean Speed of lower I frame, △ TI_FrameFor the time span of I frame period, △ CRI_CompensateFor I frame code rate offset,
△FCompensateFor frame per second offset.
7. the method according to claim 1, wherein working as the CRUU_CurrentMeet condition C RUU_Current>
CRCurrent_mWhen, this method further comprises：
If current frame rate FCurrent<FBase_n, then keep resolution format constant, target bit rate be set as Min [CRUU_Current,
CRBase_m], and according to the CRUU_CurrentBenchmark frame per second corresponding with the current rate travel calculates target frame rate；
If current frame rate FCurrent=FBase_nAnd CRUU_CurrentBenchmark code rate CR under≤current resolution formatBase_m, then protect
It holds resolution format and frame per second is constant, target bit rate is set as Min [CRUU_Current,CRBase_m]；
If current frame rate FCurrent=FBase_nAnd CRUU_Current>CRBase_m, then it is m+1 by target resolution format setting, by mesh
Coding rate is set as Min [CRUU_Current,CRMax_m+1], and according to CRUU_CurrentBenchmark corresponding with the current rate travel
Frame per second calculates target frame rate；
Wherein, the resolution ratio resolution format m of resolution format m+1 increases level-one, CRMax_m+1Indicate m+1 pairs of resolution format
The maximal rate answered.
8. the method according to the description of claim 7 is characterized in that keeping the frame per second of I frame not when calculating the target frame rate
Become.
9. according to the method described in claim 8, it is characterized in that, if current frame rate FCurrent<FBase_n, the calculating target frame
Rate is：FPred=Min [FPred,FMax_n]；Wherein,
FPred=1+ (CRUU_Current-(CRCurrent_I_frame+△CRI_Compensate))/CRPred_PB_frame+△FCompensate,
CRPred_PB_frame=(CRUU_Current-CRCurrent_I_frame)/((FCurrent*△TI_Frame) -1), CRCurrent_I_frameIt is current
Resolution ratio current frame rate FCurrentThe Mean Speed of lower I frame, △ CRI_CompensateFor I frame code rate offset, △ FCompensateFor frame
Rate offset, FCurrentFor the current frame rate of the transmission video, FMax_nIt is corresponding most for pre-set current rate travel
Big frame per second, △ TI_FrameFor the time span of I frame period.
10. according to the method described in claim 8, it is characterized in that, if current frame rate FCurrent=FBase_nAnd CRUU_Current>
CRBase_m, the calculating target frame rate is：FPred=Min [FPred,FMax_n]；Wherein,
FPred=1+ (CRUU_Current-(CRCurrent_I_frame+△CRI_Compensate))/CRPred_PB_frame+△FCompensate,
CRPred_PB_frame=(CRUU_Current-CRCurrent_I_frame)/((FBase_n*△TI_Frame) -1), CRCurrent_I_frameIt is current
Resolution ratio current frame rate FCurrentThe Mean Speed of lower I frame, △ CRI_CompensateFor I frame code rate offset, △ FCompensateFor frame
Rate offset, FMax_nFor the corresponding maximum frame per second of pre-set current rate travel, △ TI_FrameTime for I frame period is long
Degree, FPredFor target frame rate.
11. according to claim 1 to any method in 10, which is characterized in that the mobile device passes through codec
SPS mechanism or SIP signaling the target resolution format, target bit rate and target frame rate be sent to the transmission video
Receiving end.
12. according to the method for claim 11, which is characterized in that this method further comprises：Before transmitting video, institute
It states mobile device and sends the resolution format and frame per second that itself is supported to the receiving end, and receive connecing for the receiving end feedback
The resolution format and frame per second that receiving end is supported.
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| CN106817588B (en) * | 2017-02-06 | 2019-07-05 | 网宿科技股份有限公司 | Transcoding control method and device, net cast method and system |
| JP7059662B2 (en) * | 2018-02-02 | 2022-04-26 | トヨタ自動車株式会社 | Remote control system and its communication method |
| WO2020062134A1 (en) * | 2018-09-29 | 2020-04-02 | 深圳市大疆创新科技有限公司 | Method for adjusting image transmission resolution ratio, image photographing device, machine readable storage medium |
| CN109348244B (en) * | 2018-11-20 | 2021-05-18 | 浙江齐聚科技有限公司 | Method, device, equipment and storage medium for configuring video coding parameters |
| CN109819333B (en) * | 2019-01-10 | 2021-05-07 | 广州视源电子科技股份有限公司 | Video stream code rate allocation method and device and computer readable storage medium |
| CN110234023A (en) * | 2019-02-22 | 2019-09-13 | 华为技术有限公司 | A kind of method and apparatus handling video traffic |
| CN110505501B (en) * | 2019-08-28 | 2021-12-07 | 咪咕视讯科技有限公司 | Information processing method, electronic device, and computer-readable storage medium |
| CN110912922B (en) * | 2019-12-03 | 2022-09-16 | 锐捷网络股份有限公司 | Image transmission method and device, electronic equipment and storage medium |
| CN113050906A (en) | 2019-12-26 | 2021-06-29 | 深圳市万普拉斯科技有限公司 | Frame rate adjusting method and device of display screen, terminal and storage medium |
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