38 lines
738 B
Bash
38 lines
738 B
Bash
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#!/bin/bash
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set -e
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if [ -z "$3" ]; then
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cat <<- EOF
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Usage: slow-mo.sh /input.mp4 /outputm.mp4 RATE
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Alternative flags( environment variables ):
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REMOVE_AUDIO
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When this is set the audio output is disabled
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SLOW_RATE
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2.0 => Half speed
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3.0 => 3x slower
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Formula is 1 / RATE => OutputRate
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EOF
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exit 0
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fi
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# If this gets set then we do not create the first clip with audio
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# Default to having no audio
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if [ ! -z "$REMOVE_AUDIO" ]; then
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echo "Audio: DISABLED"
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FFMPEG_COPY="-c copy -an"
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else
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echo "Audio: ENABLED"
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FFMPEG_COPY="-c:v copy"
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fi
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# Aliasing input variables
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input="$1"
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output="$2"
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SLOW_RATE=2.0
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LOG="-loglevel error"
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ffmpeg $LOG -y -i "$input" -vf "setpts=$SLOW_RATE*PTS" "$output"
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