48 lines
909 B
Bash
48 lines
909 B
Bash
#!/bin/bash
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###########################
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#
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# Export a video to an image sequence at a
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# particular framerate.
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#
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###########################
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MULTIPLE=3
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FPS=24
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RATE=`echo "scale=0;${FPS}/${MULTIPLE}" | bc`
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TIMESTR=""
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INPUT="${1}"
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OUTPUT="${2}"
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INVERT="${3}"
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START_FRAME=${4}
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END_FRAME=${5}
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WIDTH=323
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HEIGHT=242
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if [[ "${INVERT}" != "" ]] && [[ "${INVERT}" == "negative" ]]; then
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INVERT="negate,"
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else
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INVERT=""
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fi
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if [[ "${START_FRAME}" != "" ]]; then
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START=`echo "scale=6;${START_FRAME}/${FPS}" | bc`
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TIMESTR="${TIMESTR} -ss ${START}"
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fi
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if [[ "${END_FRAME}" != "" ]]; then
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TIME=`echo "scale=6;(${END_FRAME}-${START_FRAME})/${FPS}" | bc`
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TIMESTR="${TIMESTR} -t ${TIME}"
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fi
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mkdir -p "${OUTPUT}"
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ffmpeg -y -re -r ${FPS} -i "${INPUT}" \
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${TIMESTR} \
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-f image2 \
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-r ${RATE} \
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-vf ${INVERT}crop=in_h/3*4:in_h,scale=$WIDTH:$HEIGHT,setsar=1:1 \
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-q:v 1 -qmin 1 -qmax 1 \
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"${OUTPUT}/image_%06d.png" |