TechnicalMonkey Capture Card to Twitch Steam.... Need Help

ffmpeg -rtbufsize 2048M -video_size 1920x1080 -f dshow -show_video_device_dialog true -i video="Video (00 Pro Capture HDMI 4K+)":audio="Audio (00 Pro Capture HDMI 4K+)" -vcodec libx264 -preset veryfast -pix_fmt bgr24 -s 1280x720 -r 30 -b:v 8000k -bufsize 8000k -maxrate 8000k -c:a aac -b:a 96k -ac 2 -ar 48000 -f flv rtmp://live-iad.twitch.tv/app/{key}?bandwidthtest