Ben Smith uotw

emergency physician who writes code to help physicians learn bedside ultrasound, and ultimately improve patient care

uotw / osd_dji_hd.c

Last active January 27, 2020 02:53

options for iNav DJI FPV CRAFT_NAME tele insertion

	//this snippet of code is from inav-2.4.0-RC1/src/main/io/osd_dji_hd.c
	case DJI_MSP_NAME:
	{

	/* DIRECTION TO HOME, DIST TO HOME, SPEED, ALT */
	int speed = (int)(gpsSol.groundSpeed * 0.0223694); // centimeters per second to MPH
	int altitude = (int)lrintf(getEstimatedActualPosition(Z) * 0.0328084); // centimeters to feet
	static char dirAndDist[16];
	static char arrow[7];

uotw / quad.sh

Last active August 7, 2019 04:00

combine 4 clips into one 2 x 2 grid video mosaic

	#!/usr/bin/env bash
	finalwidth=$(ffprobe -v error -select_streams v:0 -show_entries stream=width -of csv=p=0 $1)
	finalheight=$(ffprobe -v error -select_streams v:0 -show_entries stream=height -of csv=p=0 $1)
	halfwidth=$(echo "$finalwidth/2" \| bc)
	halfheight=$(echo "$finalheight/2" \| bc)
	x="x"
	ffmpeg -i $1 -i $2 -i $3 -i $4 -filter_complex "nullsrc=size=$finalwidth$x$finalheight [base]; [0:v] setpts=PTS-STARTPTS, scale=$halfwidth$x$halfheight [upperleft]; [1:v] setpts=PTS-STARTPTS, scale=$halfwidth$x$halfheight [upperright]; [2:v] setpts=PTS-STARTPTS, scale=$halfwidth$x$halfheight [lowerleft]; [3:v] setpts=PTS-STARTPTS, scale=$halfwidth$x$halfheight [lowerright]; [base][upperleft] overlay=shortest=1 [tmp1]; [tmp1][upperright] overlay=shortest=1:x=$halfwidth [tmp2]; [tmp2][lowerleft] overlay=shortest=1:y=$halfheight [tmp3]; [tmp3][lowerright] overlay=shortest=1:x=$halfwidth:y=$halfheight" -c:v libx264 quad_vid.mp4