Multiple ComArt XeCap and extention boards support
LuxRiot 1.1.18 and above support multiple ComArt XeCap capture boards and extension daughter boards. Maximum number of channels supported by single capture board is 32 (depends on model). Installation of two or more capture boards increases maximum amount respectively. Popup window in Structure pane helps to find out what particular board the given channel belongs to, e.g. 1:16 means board_number_1:channel_16.
It is however important to be aware of multichannel capture constraints imposed by available PCI band-width, especially in case of ComArt XeCap boards, since the board may utilize the entire available band-width. To workaround possible problems and achieve highest frame rates it is recommended to check “PCI band-width control” checkbox and to choose YUV 4:1:1 video format (XeCap properties. YUV411 can bring more frame rate than YUV422 (1.3 times). Video quality, however, may slightly degrade and CPU load may increase.
For a 240 FPS capture board (or several boards delivering 240 frames per second in total) required YUV411 PCI band-width is approximately 60MB/sec, YUV422 video format requires 80MB/sec for the same amount of video data. Allowed PCI band-width is limited around 60MB/sec. As a result, the board would be able to send YUV411 video data within available band-width. YUV422 capture, however, is likely to be distorted because of overusage of PCI band-width.