#!/bin/bash DURATION=300 RESOLUTION=1280x720 VBITRATE=4096 ABITRATE=160 if [[ $# -lt 1 ]] ; then echo "Not enough arguments supplied" >&2 echo "You need to pass at least the duration in seconds " >&2 echo " " >&2 echo "syntax: " >&2 echo " $(basename $0) " >&2 echo " " >&2 echo "other parameters are optional and will default to the " >&2 echo "values in the following example :" >&2 echo " `basename $0` $DURATION $RESOLUTION $VBITRATE $ABITRATE" >&2 exit 1 fi if [[ ! -z "$1" ]] then DURATION="$1" fi if [[ ! -z "$2" ]] then RESOLUTION="$2" fi if [[ ! -z "$3" ]] then VBITRATE="$3" fi BUFFERSIZE=$(echo "2*${VBITRATE}" | bc) if [[ ! -z "$4" ]] then ABITRATE="$4" fi FILENAME=pattern-sine-${RESOLUTION}p-${DURATION}s-${VBITRATE}kbps-${ABITRATE}kbps.mkv echo " " echo Will generate image pattern with sine wave stream for $DURATION seconds to file : echo $FILENAME echo with : echo "- $RESOLUTION resolution, " echo "- $VBITRATE kbit/s constant video bitrate, " echo "- $BUFFERSIZE kbit video buffer and " echo "- $ABITRATE kbit/s audio bitrate" echo " " rm $FILENAME #-x264opts nal-hrd=cbr:force-cfr=1:vbv-bufsize=${BUFFERSIZE}:bitrate=${VBITRATE}:vbv-maxrate=${VBITRATE} \ ffmpeg \ -loglevel level \ -s ${RESOLUTION} \ -loop 1 \ -r 30 \ -y \ -ac 2 \ -i Mire_1080p.png \ -f lavfi \ -i aevalsrc="0.1*sin(2*PI*(360-2.5/2)*t)|0.1*sin(2*PI*(360+2.5/2)*t):sample_rate=48000" \ -channel_layout stereo \ -ar 48000 \ -shortest \ -pixel_format yuv420p \ -filter_complex "[1:a]volume=-10dB;[0:v]scale='size=${RESOLUTION}',drawtext='font=DejaVuSansMono:text=%{pts}: fontcolor=white: fontsize=h/7: box=1: boxcolor=black@0.73: boxborderw=5: x=mod(floor(t/10+1)\,2)*mod(t*(w-text_w)/10\,w-text_w)+mod(floor(t/10)\,2)*(w-text_w-mod(t*(w-text_w)/10\,w-text_w)): y=h/2-3*text_h/2'" \ -codec:v libx264 \ -preset superfast \ -x264opts bitrate=${VBITRATE} \ -c:a aac -b:a ${ABITRATE}k \ -t ${DURATION} \ ${FILENAME}