79 lines
2 KiB
Bash
Executable file
79 lines
2 KiB
Bash
Executable file
#!/bin/bash
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DURATION=300
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RESOLUTION=1280x720
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VBITRATE=4096
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ABITRATE=160
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if [[ $# -lt 1 ]] ; then
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echo "Not enough arguments supplied" >&2
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echo "You need to pass at least the duration in seconds " >&2
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echo " " >&2
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echo "syntax: " >&2
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echo " $(basename $0) <duration-in-sec> <resolution> <video-bitrate-kbps> <audio-bitrate-kbps>" >&2
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echo " " >&2
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echo "other parameters are optional and will default to the " >&2
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echo "values in the following example :" >&2
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echo " `basename $0` $DURATION $RESOLUTION $VBITRATE $ABITRATE" >&2
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exit 1
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fi
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if [[ ! -z "$1" ]]
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then
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DURATION="$1"
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fi
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if [[ ! -z "$2" ]]
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then
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RESOLUTION="$2"
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fi
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if [[ ! -z "$3" ]]
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then
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VBITRATE="$3"
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fi
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BUFFERSIZE=$(echo "2*${VBITRATE}" | bc)
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if [[ ! -z "$4" ]]
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then
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ABITRATE="$4"
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fi
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FILENAME=pattern-sine-${RESOLUTION}p-${DURATION}s-${VBITRATE}kbps-${ABITRATE}kbps.mkv
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echo " "
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echo Will generate image pattern with sine wave stream for $DURATION seconds to file :
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echo $FILENAME
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echo with :
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echo "- $RESOLUTION resolution, "
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echo "- $VBITRATE kbit/s constant video bitrate, "
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echo "- $BUFFERSIZE kbit video buffer and "
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echo "- $ABITRATE kbit/s audio bitrate"
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echo " "
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rm $FILENAME
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ffmpeg \
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-loglevel level \
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-s ${RESOLUTION} \
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-loop 1 \
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-r 30 \
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-y \
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-ac 2 \
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-i Mire_1080p.png \
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-f lavfi \
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-i aevalsrc="(1-min(1\,mod(floor(5*t)\,50)))*0.1*sin(8*PI*(360-2.5/2)*t)+0.1*sin(2*PI*(360-2.5/2)*t)|(1-min(1\,mod(floor(5*t)\,50)))*0.1*sin(8*PI*(360+2.5/2)*t)+0.1*sin(2*PI*(360+2.5/2)*t):sample_rate=48000" \
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-channel_layout stereo \
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-ar 48000 \
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-shortest \
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-pixel_format yuv420p \
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-filter_complex "[1:a]volume=-10dB;[0:v]scale='size=${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'" \
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-codec:v libx264 \
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-preset superfast \
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-x264opts bitrate=${VBITRATE} \
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-c:a aac -b:a ${ABITRATE}k \
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-t ${DURATION} \
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${FILENAME}
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