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The Video capture device object for grabbing video image from all Server displays/monitors via FFMPEG driver can be added either by manually creating the Video capture device or using the Camera discovery tool. The latter way is preferable.
The driver also supports capturing system sounds and sounds from the computer's microphone. Audio input and output format is PCM. The Audio card and Microphone objects should also be created and configured in addition to the Video capture device object in order to use this functionality. This can also be done using the Camera discovery tool. To capture system sounds, you configure the system accordingly (see below).
Configuring the system for capturing the system sound
In order to capture system sounds, enable the Stereo Mix device as follows:
Go to the Recording tab in the Sound window.
Note.
In Windows 7, in order to open this window, select Recording Devices in the menu that opens when you right-click the speaker icon.
If there is no Stereo Mix device on the Recording tab, right-click any empty space in the list and select Show Disabled Devices.
If the Stereo Mix device is disabled, right-click it and select Enable.
If the Stereo Mix device has any other name, rename it to "Stereo Mix" (case-sensitive); to do so, right-click the device then select Properties and enter the new name in the text field.
Click the Apply button in the Sound window.
Creating the Video capture device and Audio card object
Add the Video capture device object for grabbing video image from application windows and Audio card and Microphone objects for grabbing sounds via FFMPEG driver as follows:
- Start the Camera discovery tool.
Enter any IP address in the IP address field (1). The driver automatically sets the proper address for this model.
Note.
When adding this device type by manually creating the Video capture device object, set the following IP address: gdigrab://desktop
- From the Brand drop-down list, select FFMPEG (2).
- From the Model drop-down list, select Desktop capturer (3).
- From the Firmware drop-down list, select auto (4).
- Click Add (5). The device is added to the list.
- Set the checkbox next to the added device and the child objects you need (6):
- Select Video channel to capture video;
- Select Audio input 1 to capture audio from the speaker selected as the default output device in the system;
Select Audio input 2 to capture audio from the microphone selected as the default device (not communication) in the system.
Important.
The default microphone/speaker is defined when adding a Video capture device object. If you switch the default microphone/speaker (for example, by connecting a USB camera or microphone/speaker connector, or simply changing the system settings) after that without unloading Axxon PSIM, then switching to the new default device will NOT be performed automatically. To update the linked device, restart Axxon PSIM or delete the Video capture device and Audio card objects and re-add them.
- Click Apply (7).
- Click Exit (8).
Additional options for the FFMPEG device
The address with additional options for the ffmpeg utility can be specified in the IP address field on the Video capture device object settings panel. In this case, the address has the following format:
gdigrab://desktop: [-additionalOptions]
For example, a specific area can be set with several other options. Below is the list of options supported by the ffmpeg library for the gdigrab mode:
- -draw_mouse <int> draw the cursor (0 or 1) (1 by default);
- -show_region <int> draw borders across the capture line (0 or 1) (0 by default);
- -framerate <video_rate> set frame rate ("ntsc” by default);
- -video_size <image_size> set frame size;
- -offset_x <int> indent along the x axis of the capture area (from INT_MIN to INT_MAX) (0 by default);
- -offset_y <int> indent along the y axis of the capture area (from INT_MIN to INT_MAX) (0 by default);
Example of "additionalOptions” property:
-draw_mouse 1 -show_region 1 -framerate 25 -video_size 640x480 -offset_x 10 -offset_y 10
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