SightLine Applications Inc.
SightLine Applications Command, Control, and Script API  v3.7
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SLASetEthernetVideoParameters_t Struct Reference


Affects the quality, size and frame rate of the individual video frames sent over Ethernet.

typedef struct {
u8 quality;
u8 foveal;
u8 frameStep;
u8 frameSize;
u16 displayId;
u16 customWide;
u16 customHigh;

See SLASetH264Parameters_t for additional H.264 specific parameters.

Output Frame Size

Size of destination video. Works only when Video Format is set to a compatible format (see SLASetEthernetDisplayParameters_t)

Value Description
0 Output size = input size
1 640x480 (NTSC)
2 768x576 (PAL)
3 720p (1280x720)
4 720p cropped (960x720)
5 1080p (1920x1080)
6 1080p cropped (1440x1080)
7 1280x960
8 240 (320x240)
9 4000 only: 2560x1440 (H264 and H265 only)
10 4000 only: 3840x2160 (4K) (H264 and H265 only)
11 Custom size specified by customWide and customHigh parameters

Message ID 0x1A

Byte Offset Name Description
4quality0: lowest image quality to 100: highest image quality 0 to 100 (default 80); applies only to MJPEG video
5fovealReduces image quality for pixels away from image center – 0: no quality reduction, 100 : maximum quality reduction; applies only to MJPEG video
6frameStep1 shows every frame, 2 shows every other frame, etc. Applies to Analog, HDMI, HD-SDI and Ethernet video display. 1 to 120 (default 1).
NOTE: This feature is useful for freeing processor load from display so that telemetry output can maintain full rate output for camera gimbal control.It also provides consistent display timing that can look better than alternating between showing and skipping frames.
7frameSizeSpecifies frame size. Bits 0..3: set to 0, Bits 4..7: Output Frame Size
8-9displayIdNetwork Display ID
4000/17XX: (0x0002 = Net0, 0x0080 = Net1, 0x0082 = both)
10-11customWideWidth of video in pixels when Output Frame Size is set to Custom. Range: 224 to 1920(17xx)/3840(4000), must be a multiple of 32.
12-13customHighHeight of video in pixels when Output Frame Size is set to Custom. Range: 224 to 1080(17xx)/2160(4000), must be a multiple of 8.