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Video capture card resources

By default, the resources of the video capture

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card used to process and digitize video signals are uniformly distributed between cameras

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. The frame rate of the digitized video signal is limited by the ADC resources for video signal processing and digitization.

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Axxon PSIM software package components that are used for configuring video capture cards can give additional ADC resources to one or more cameras

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, and thus

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increase the frame rate of video signals from these cameras. At the same time the frame rate of the video

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signal from other cameras

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decreases.

The joint use of Axxon PSIM and video capture cards sharing allows provides the following options for reallocating video capture card resources to the between cameras:

Option 1. Reallocation of cameras between ADCs of a video capture card.

ADC resources are generally characterized by the maximum total frame rate of video signals. By default, ADC resources are uniformly distributed between cameras to the assigned cameras. So, which are processed and digitized by this ADC. Thus, the more camera video signals from cameras are digitized and processed by the ADC, the lower the frame rate of the single each digitized video signal is.

Reallocation of cameras between ADCs allows increasing the frame rate for some cameras by means of decreasing it for others.

If all allowable cameras are connected to a video capture card, then only uniform distribution on ADC is possible. In this case, every ADC of a video capture card digitizes and processes video signal signals from an equal number of cameras. SoThus, the maximum allowable frame rate is the same for all video signals (except for video signals of different formats and different frame resolutions).

If the number of cameras connected to a video capture card is less than their maximum number, then it is possible to you can reallocate them between ADCs of a video capture card. For this, those cameras , which whose frame rate is to be increased, you want to increase are allocated separately to one ADC , or allocated in a number that is less than the maximum allowable one. Cameras allocated to a given ADC and not that aren't subject to strict frame rate requirements , are reallocated to other ADCs.

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Option 2. Reallocation of resources of one ADC between cameras, video signal signals of which are to be processed and digitized by one ADC.

By default, the ADC resources are uniformly distributed between cameras, video signals of which are digitized and processed by this ADC. 

Reallocation of cameras between ADCs allows increasing the frame rate for some cameras by means of of decreasing it for others. Reallocation of resources of one ADC to the cameras is much less effective than camera reallocation of cameras between the ADC. Therefore this is to be done , you must do this only if camera reallocation to the ADC is impossible or if it does not doesn't help. 

With reallocation of resources from 1 ADC to the To reallocate resources of one ADC between cameras, give one of the cameras gets extra ADC resources for its video signal processing and digitization. Extra You can give extra ADC resources are formed by removing them from other cameras video signals of which whose are processed by the ADC.

So, for a single Thus, within one ADC, when you can increase the frame rate of a certain camera increases, video signal from one camera only when you decrease the frame rates rate of video signal from other cameras decrease.

To perform do this operation, a place the selected camera is to have priority in the priority process queue.

An example of reallocation of resources of one ADC between cameras is shown in the figure below.

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1. Live video.
2. Multiplexing.

In the Live video mode, all resources of an ADC are used to process the single only one video signal. The mode provides digital video stream with a maximum frame rate of 25 FPS in PAL format and 30 FPS in NTSC format.

If the ADC processes two or more video signals, its resources are used in the multiplexing mode. Then the ADC resources are uniformly allocated between the cameras, and in addition to video signal processing, part of its resources support the multiplexing process. SoThus, in the multiplex mode, the total frame rate of video signals , digitized by a single ADC , is much lower than in the Live video mode.

The maximum permissible allowable total frame rate in the multiplexing mode depends on the frame resolution of video signals.

For ADC that digitizes all video signals with standard (352 x 288 pixels in PAL format, 352 x 240 pixels in NTSC format) and/or high (704 x 288 pixels in PAL format, 640 x 240 pixels in NTSC format) frame resolution, the total frame rate is 16 FPS in PAL format and 20 FPS in NTSC format.

When If ADC digitizes at least one of the video signals with full resolution (704 x 576 pixels in PAL format, 640 x 480 pixels in NTSC format), the maximum permissible allowable total frame rate is reduced reduces to 12 FPS in PAL format and 15 FPS in NTSC format.

Frame rate setup procedure

Default settings for the With default settings, you can receive digitized video signals with frame rate rates that are 2 FPS in PAL format and 2.5 FPS in NTSC format.

While settings it is possible to increase or to During setup, you can increase and reduce the frame rate.

To set up the frame rate, do the following:

1. Switch off the Camera objects , which are assigned that correspond to the idle video channels. This allows allocating the resources between working cameras only and , thus increasing the frame rate of their video signals. 
2. Change frame grooming.
3. Reallocate cameras on ADC of the video capture card.
4. Reallocate resources of one ADC between cameras (priority process queues).

In most cases, 1 and 2 setting steps are sufficient to set the frame rate.  3 and 4 setting steps are necessary only with high frame rate requirements to one or more cameras.

Configuring video subsystem with disabled video channels

By default, resources of video capture cards’ ADC are allocated uniformly between all video channels, whether there is any signal passing through it or not. SoThus, even if a video channel has no signal, the resources of ADC are allocated to it.Several Camera objects are disabled in turneach video channel.

To prevent allocation of ADC resources for digitization and processing of idle video channels, you must disable the Camera objects that correspond to these channels in Axxon PSIM.

Disable several Camera objects are to be disabled in Axxon PSIM, assigned to the disabled video channelsin turn.

To disable the Camera objects that correspond to the idle video channels in Axxon PSIM, do the following:

1. Define the numbers of the idle video capture channels (taking into account BNC plug numbering).
2. Go to the Hardware tab in the System settings box window.
3. In the object tree on the Hardware tab, select the Camera object, created before, with the same channel number as the BNC plug (idle channel). The settings panel for the selected object is displayed on the right of the Hardware tab.
4. Make sure that no video signal is isn't displayed in the video field (1).
   
   The display of the video signal in the video field indicates that the Camera object matches another video channel.
5. The video channel number is specified in the Channel number drop-down list in the Basic settings tab (2). Match the Camera object with the channel number, which corresponds to the BNC plug number and the Camera object number, or scan for a Camera object, matched with the desired channel number.
6. Set the Disabled Disable checkbox (3).
7. Click the Apply button.

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Configuration of video subsystem with disabled video channels is complete.

Actual frame rate

It is recommended to define We recommend defining the actual frame rate of video signal digitization and then to set setting up the frame rate for video signals from video surveillance system cameras. 

Frame You must perform frame rate setup must be performed if frame rates of video signal signals from one or more cameras do not don't meet the requirements.

Actual frame rates are defined for each camera individually.

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• video stream frame rate (FPS);
• size of the displayed frame in bytes ( the parameter can be usedyou can use this parameter, for example, to understand whether the displayed frame is a reference frame or to calculate the average bitrate);
• video stream resolution in pixels.

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1. Video signal processing and digitization with a high frame rate is a resource-intensive process. When the video signal frame rate increases, configuration requirements increase for the computer used as a Serverserver.
2. Video signal is transmitted to the Remote Workplaces with the same frame rate as it was is digitized. So, network capacity requirements increase together with the frame rate increase.

By default, the total frame rate of video signals, which are digitized and processed by the same ADC, is 2 two times lower than the maximum allowed one. This ratio is provided supported by frame decimation, which allows provides every second frame to be processed for further processing by the programfunctional modules of the Axxon PSIM.

Settings allow reducing You can reduce (total frame rate increases) or increasing increase (total frame rate decreases) the decimation.

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1. Go to the Hardware tab in the System settings box window (1).
2. Select the relevant Video Capture Device object, created before, in the the Video capture device object that was created before and corresponds to the configured ADC of the video capture card on the Hardware tab in the objects tree (2). The settings panel for the selected object is displayed in the right part of the Hardware tab.
   
3. If it is necessary to increase the total frame rate up to the maximum allowed value, move the Rate slider to the Max max position (3).
4. If it is necessary to reduce the total frame rate to the minimum allowed value, move the Rate slider to the
Min
5. min position. The minimum total frame rate of video signals, digitized and processed by a selected ADC, is
3
6. three times lower than the maximum allowed one.
7. If it is necessary to return the default decimation settings, move the Rate slider to the middle position. The default total frame rate is
2
8. two times lower than the maximum allowed one.
9. Click the Apply button (4).
10. Close the System settings box and restart Axxon PSIM.

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By default all cameras are uniformly allocated to ADC of video capture card. Thus, ADC resources are uniformly distributed to the between cameras, attached connected to the video capture card, and all cameras have the same frame rate of the digitized video signal. 

If the number of cameras connected to a video capture card is less than their maximum allowed number, it is possible to reallocate them between different ADCs of the video capture card. Reassigning of cameras This allows increasing the frame rate for some cameras by means of a decrease in decreasing the same frame rate of others.value for other cameras. 

Before reassigning the cameras to ADCs of the video capture card, disable the Camera objects corresponding to disabled cameras (see Configuring video subsystem with disabled video channels section).

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1. Go to the Hardware tab in the System settings box window.
2. Select the Camera object, created before, corresponding to the camera
, which
3. whose frame rate
is
4. you want to
be increased
5. increase, in the objects tree
in
6. on the Hardware tab
(2)
7. . The settings panel for the selected object is displayed on the right of the Hardware tab.
8. To In case, if you want to increase the frame rate of a camera up to the Real time rate (25 FPS in PAL format and 30 FPS in NTSC format), reallocate other cameras serviced , the video signals of which are digitized by the same ADC as with the for this camera above, to other ADCs.

For this, move the Camera objects to the parent branches of other Video capture device objects. The You can set the parent Video capture device object for a the Camera object is set by selecting the number of the parent object in the the Video capture device list of settings panel for the Camera object settings panel. As a result, the Camera object moves to a subdirectory the child branch of the selected set Video capture device object in the objects tree.

Example 1. Configuring video signal digitization with the Real time frame rate.

Task. Video signal on Camera 2 is to 2  must be digitized with the Real time frame rate.

Initial data. The card has 4 four ADCs. They are matched to 4 four Video capture device objects in the objects tree. The video capture card may have up to 16 cameras connected to it. 8 Eight cameras are actually connected to the video capture card. The objects matched to the remaining 8 eight cameras are disabled. Each of two ADCs, matched to the Video capture device 1 and Video capture device 2 objects, is configured to digitize the signals from 4 four cameras. The ADCs matched to the Video capture device 3 and Video capture device 4 objects aren't configured to digitize signals from any cameras. An example of the objects tree is given in figure A:

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1. Select the Camera 1 object in the objects tree. The settings panel for the selected object is displayed.
2. Select Video capture device 3 in the Video capture device list.
3. Click the Apply button.
4. The Camera 1 object moves to the subdirectory child branch of the the Video capture device 3 object (see B).
5. Repeat 1-4 steps for the Camera 3 and Camera 4 objects.
6. Select the Video capture device 1 object in the objects tree.
7. Make sure that the Speed slider is in the max position.
   If the Speed slider is in the max position, then setup is completed.
   If the Speed slider is in another position, move it to the max position and do 8-10 steps.
8. Click the Apply button.
9. Close the System settings box window and restart restart Axxon PSIM.
10. The frame rate of the selected camera increases up to the Real time rate (for information on testing the frame rate change, see Actual frame rate).
11. If the number of connected cameras
prevents the configuration
12. doesn't allow setting up digitization of video signal
digitization
13. from one of the cameras with the
Real
14. real time rate (for example, when 15 out of 16 allowed cameras are connected)
,
15. or if it is necessary to increase the frame rate
on
16. of several cameras
is to be increased
17. simultaneously to the rate
,
18. lower than the
Real
19. real time one,
then
20. the
cameras, the frame rate of which is to be increased
21. allocation of cameras between ADCs is performed as follows: the cameras for which it is necessary to increase the frame rate, are allocated between ADCs
and they do not exceed
22. in the number less than the maximum allowable
number
23. one. The frame rate is increased by as many times
,
24. as the number of cameras on ADC is reduced.

Allocation of video capture card’s resources is complete.

Example 2. Configuring video signal digitization from 2 two cameras with increased frame rate

Task. Video signal on Camera 1 and Camera 5 is to must be digitized with increased frame rate.

Initial data. The card has 4 four ADCs. They are matched to 4 four Video capture devices objects in the objects tree. The video capture card may have up to 16 cameras connected to it. 12 cameras are actually connected to the video capture card. The objects matched to the remaining 4 four cameras are disabled. Each of 3 three ADCs, matched to the Video capture device 1, Video capture device 2 and Video capture device 4 objects, is configured to digitize the signals from 4 four cameras. The ADC, matched to the Video capture device 3 object, is not isn't configured to digitize the signals from any camera. An example of the objects tree is given in figure A.

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1. Select the Camera 1 object in the objects tree. The settings panel for the selected object is displayed.
2. Select the Video capture device 3 in value from the Video capture device list.
3. Click the Apply button.
4. The Camera 1 object moves to a subdirectory of the the child branch of the Video capture device 3 object (B).
5. Repeat 1-4 steps for the Camera 5 object.
6. The frame rate on Camera 1 and Camera 5 increases twofold (for information on testing the frame rate change see the Actual frame rate section).
7. Click the Apply button.

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Video signal processing priorities

The By default, the ADC resources are uniformly distributed to the assigned cameras by default.between cameras, video signals of which are digitized and processed by this ADC.

Reallocation of cameras between ADCs ADC resources reallocation allows increasing the frame rate for a camera some cameras by means of other camerasdecreasing it for others. Reallocation of resources from 1 of one ADC between to the cameras is much less effective than camera reallocation on of cameras between the ADC. Therefore it should only be done , you must do this only if camera reallocation on to the ADC is impossible or if it does not doesn't help. 

With reallocation of resources from 1 To reallocate resources of one ADC between the cameras, give one of the cameras is allocated with additional extra ADC resources for its video signal processing and digitization. Additional You can give extra ADC resources are formed by removing them from other cameras , video signals of which are processed by the ADC.A camera is allocated with additional ADC resources via the priority process queue

To give a camera extra ADC resources, place it in the video signal processing queue, which has the higher priority than the other cameras.

Axxon PSIM provides 1/2 and 1/3 process queues.

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Example 1. The ADC is configured to digitize video signal from 4 four cameras.

If all the cameras have a common queue, the ADC digitizes video signals in the following sequence:

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Camera 1, Camera 2, Camera 1, Camera 3, Camera 1, Camera 4, Camera 1…

SoThus, the frame rate on Camera 1 is increased by 2 two times and becomes the half of total frame rate of the considered ADC. The frame rate of each of the remaining cameras becomes 1.5 times less and makes up 1/6 of total frame rate of the considered ADC.

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Camera 1, Camera 2, Camera 1, Camera 3, Camera 1, Camera 2…

SoThus, the frame rate of Camera 1 is increased by 1,.5 times and becomes the half of total frame rate of the considered ADC. The frame rate of each of the remaining cameras becomes 1.33 times less and makes up 1/4 of total frame rate of the considered ADC.

Example 3. The ADC is configured to digitize video signal from 4 four cameras.

If all the cameras have a common queue, the ADC digitizes video signals in the following sequence:

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Camera 1, Camera 2, Camera 3, Camera 1, Camera 4, Camera 2, Camera 1…

SoThus, the frame rate of Camera 1 is increased by 1.33 times and becomes one third of total frame rate of the considered ADC. The frame rate of each of the remaining cameras becomes 1.125 times less and makes up 2/9 of total frame rate of the considered ADC.

Example 4. The ADC is configured to digitize video signal from 4 four cameras.

If all the cameras have a common queue, the ADC digitizes video signals in the following sequence:

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Camera 1, Camera 2, Camera 3, Camera 1, Camera 2, Camera 4, Camera 1…

SoThus, the frame rate of Camera 1 is increased by 1.33 times and becomes equal one third of total frame rate of the considered ADC. The frame rate of Camera 2 is also increased in 1.33 times and becomes equal one third of total frame rate of the considered ADC. The frame rate of each of the remaining cameras becomes 1.5 times less and makes up 1/6 of total frame rate of the considered ADC.

Reallocation of resources of 1 one ADC between the cameras is possible in two modes:

1. In the processing mode, that is, with video signal digitization and processing prior to its display on the screen.
2. In the recording mode, that is, with video signal digitization and processing prior to its recording into the server archive. When cameras are switched to the recording mode, video signals are displayed with the rate, corresponding to the given ADC resources resource allocation.

Setting video processing priority

While processing video In video digitizing and processing mode before displaying it on the screen, ADC resources are reallocated between the cameras by queueing one of the cameras with 1/2 or 1/3 priority.

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1. Go to the Hardware tab in the System settings box window.
2. Select the Camera object , created before , corresponding to the camera, the ADC video processing queue of which is to be changed, in you want to change on the Hardware tab in the objects tree. 
3. Go to the Advanced settings tab on the settings panel of the Camera object.
   
4. Set the processing slider in the Priority group to the position:
   
   1. 1/2 to queue the camera with 1/2 priority for ADC video processing.
      
   2. 1/3 to queue the camera with 1/3 priority for ADC video processing.
   3. Normal (default), if it is necessary to return the camera into the normal queue for ADC video processing.
5. Click the Apply button.

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Setting video recording priority

While processing the video signal In video digitizing and processing mode before recording it to the video server archive, ADC resources are reallocated between the cameras by queueing one of the cameras with 1/2, 1/3 or the Real time priority.

If the camera with Real time priority switches into the recording mode, it will be is allocated with all ADC resources for its video processing and digitizing. SoThus, the frame rate on this camera becomes equal to the total frame rate of the considered video signals that are processed and digitized by this ADC. No video Video signals from other cameras, allocated to a given ADC, is aren't processed, displayed, and recorded to the disk. 

To change the processing queue of the video on from the selected camera in the recording mode, do the following:

1. Go to the Hardware tab in the System settings box window.
2. Select the Camera object
,
3. created before
,
4. corresponding to the camera, the ADC video processing queue of which
is to be changed, in the objects tree of the Hardware tab. The settings panel for the selected object is displayed on the right of the Hardware tab.
5. you want to change in recording mode on the Hardware tab in the objects tree. 
6. Go to the Advanced settings tab on the settings panel of the Camera object.
7. Set the recording slider in the Priority group to the position:
   1. 1/2 to queue the camera with 1/2 priority for ADC video processing.
   2. 1/3 to queue the camera with 1/3 priority for ADC video processing.
   3. Real time to queue the camera with the Real time priority for ADC video processing in the recording mode.
      
   4. Normal (default), if it is necessary to return the camera into the normal queue for ADC video processing in the recording mode.
8. Click the Apply button.

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