ffmpeg_publish_camera_low_latency.sh

#!/bin/bash

######################################################################
##
##      [Camera Broadcaster Script]
##
##      Can achive 200ms delay when playing from Flash via RTMP
##
######################################################################

# Keyframe Interval in seconds; make sure this is less than 500 frames otherwise a keyframe will be added
keyint_secs="1";

# Video Bitrate
bitrate="2000k";
buffsize="2000k";

rate="-minrate $bitrate -maxrate $bitrate -bufsize $buffsize"

# Video Capture -timestamps abs
video_source="-fflags +nobuffer -f v4l2  -framerate 30 -video_size '640x360' -input_format mjpeg -i /dev/video0"
#video_source="-f x11grab -framerate 30 -video_size '1280x720' -i :0.0"
video_codec="-vf format=yuv420p -c:v libx264 -b:v $bitrate -preset:v ultrafast -profile:v main -tune:v zerolatency -x264-params b-adapt=0:bframes=0:keyint=300:keyint-min=300:scenecut=0 -force_key_frames \"expr:gte(t,n_forced*$keyint_secs)\""

# Audio Capture
audio_source="-f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100"
#audio_source="-fflags +nobuffer -f alsa -ac 2 -ar 44100 -i hw:3"
audio_codec="-c:a aac -ac 2 -b:a 256k -strict -2"

output="-f flv \"rtmp://localhost/live/_definst_/clock\""
#output="-f flv camera.flv"

eval "ffmpeg -y -loglevel verbose -ss 00:00:05 -vsync 2 $video_source $audio_source $video_codec $audio_codec $rate $output";