76 lines
2.0 KiB
Bash
76 lines
2.0 KiB
Bash
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#!/bin/bash
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# usage: change-length.sh 1.007 input.mp4 output.mp4 [--fast]
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# ^output.mp4 will be be 7% longer
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# --fast is faster, but slightly more risky
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set -euo pipefail
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RATIO=$1;
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IN_FILE=$2;
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OUT_FILE=$3;
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MODE=${4-"--slow"};
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# BITRATE=$(ffmpeg -i "$IN_FILE" 2>&1 | grep bitrate | awk -F", " '{print $3}' | sed 's/bitrate: //' | sed 's/ //' | sed 's/b\/s//' || echo "");
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echo ratio set to "$RATIO"
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INV_RATIO=$(python -c "print(1/$RATIO)");
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FILTER="";
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OPTS=();
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AUDIO_FILTER="[0:a]atempo=$(echo "$INV_RATIO")[a]";
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HAS_AUDIO=$(ffprobe "$IN_FILE" 2>&1 | grep Stream | grep --count Audio || echo "0");
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HAS_VIDEO=$(ffprobe "$IN_FILE" 2>&1 | grep Stream | grep --count Video || echo "0");
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slow () {
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echo " ";
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echo " ";
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echo " ";
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echo " ";
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echo "USING SLOW MODE. If you want only video, use --fast";
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echo " ";
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echo " ";
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echo " ";
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echo " ";
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echo " ";
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echo " ";
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echo " ";
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echo "Checking streams within the file...";
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if [ "$HAS_AUDIO" -ge 0 ]; then
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FILTER=$AUDIO_FILTER;
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OPTS+=(-map "[a]");
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fi;
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if [ "$HAS_VIDEO" -ge 0 ]; then
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FILTER="$FILTER;[0:v]setpts=$RATIO*PTS[v]";
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OPTS+=(-map "[v]");
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fi;
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echo "running with filter $FILTER";
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# ffmpeg -i "$IN_FILE" -b:v $BITRATE -filter_complex "$FILTER" "${OPTS[@]}" "$OUT_FILE";
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ffmpeg -i "$IN_FILE" -filter_complex "$FILTER" "${OPTS[@]}" "$OUT_FILE";
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}
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fast (){
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if [ "$HAS_AUDIO" -ge 0 ]; then
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TEMP_VIDEO="$(dirname $IN_FILE)/.temp.$(random).video.$(basename "$IN_FILE")";
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ffmpeg -itsscale "$RATIO" -i "$IN_FILE" -c copy -an "$TEMP_VIDEO";
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TEMP_AUDIO="$(dirname $IN_FILE)/.temp.$(random).audio.$(basename "$IN_FILE")";
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ffmpeg -i "$IN_FILE" -filter_complex "$AUDIO_FILTER" -vn -map "[a]" "$TEMP_AUDIO";
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ffmpeg -i "$TEMP_VIDEO" -i "$TEMP_AUDIO" -c:v copy -c:a copy "$OUT_FILE";
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rm -f "$TEMP_AUDIO" "$TEMP_VIDEO";
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else
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ffmpeg -itsscale "$RATIO" -i "$IN_FILE" -c copy -an "$OUT_FILE";
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fi;
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}
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if [ "$MODE" = "--fast" ]; then
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fast;
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else
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slow
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fi;
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