76 lines
2.1 KiB
Bash
76 lines
2.1 KiB
Bash
|
#!/bin/bash -x
|
||
|
|
|
||
|
|
# usage: change-length.sh 1.007 input.mp4 output.mp4 [--fast]
|
||
|
|
# ^output.mp4 will be be 7% longer
|
||
|
|
# --fast is faster, but slightly more risky
|
||
|
|
|
||
|
|
set -euo pipefail
|
||
|
|
|
||
|
|
RATIO=$1;
|
||
|
|
IN_FILE=$2;
|
||
|
|
OUT_FILE=$3;
|
||
|
|
MODE=${4-"--slow"};
|
||
|
|
BITRATE=$(ffmpeg -i "$IN_FILE" 2>&1 | grep bitrate | awk -F", " '{print $3}' | sed 's/bitrate: //' | sed 's/ //' | sed 's/b\/s//' || echo "");
|
||
|
|
|
||
|
|
echo ratio set to "$RATIO"
|
||
|
|
|
||
|
|
INV_RATIO=$(python -c "print(1/$RATIO)");
|
||
|
|
|
||
|
|
FILTER="";
|
||
|
|
OPTS=();
|
||
|
|
|
||
|
|
AUDIO_FILTER="[0:a]atempo=$(echo "$INV_RATIO")[a]";
|
||
|
|
|
||
|
|
HAS_AUDIO=$(ffprobe "$IN_FILE" 2>&1 | grep Stream | grep --count Audio || echo "0");
|
||
|
|
HAS_VIDEO=$(ffprobe "$IN_FILE" 2>&1 | grep Stream | grep --count Video || echo "0");
|
||
|
|
|
||
|
|
slow () {
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo "USING SLOW MODE. If you want only video, use --fast";
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo " ";
|
||
|
|
echo "Checking streams within the file...";
|
||
|
|
|
||
|
|
if [ "$HAS_AUDIO" -ge 0 ]; then
|
||
|
|
FILTER=$AUDIO_FILTER;
|
||
|
|
OPTS+=(-map "[a]");
|
||
|
|
fi;
|
||
|
|
|
||
|
|
if [ "$HAS_VIDEO" -ge 0 ]; then
|
||
|
|
FILTER="$FILTER;[0:v]setpts=$RATIO*PTS,hwupload[v]";
|
||
|
|
OPTS+=(-map "[v]");
|
||
|
|
fi;
|
||
|
|
|
||
|
|
echo "running with filter $FILTER";
|
||
|
|
|
||
|
|
ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 -i "$IN_FILE" -b:v $BITRATE -filter_complex "$FILTER" "${OPTS[@]}" -c:v h264_vaapi "$OUT_FILE";
|
||
|
|
# ffmpeg -i "$IN_FILE" -filter_complex "$FILTER" "${OPTS[@]}" "$OUT_FILE";
|
||
|
|
}
|
||
|
|
|
||
|
|
fast (){
|
||
|
|
if [ "$HAS_AUDIO" -ge 0 ]; then
|
||
|
|
TEMP_VIDEO="$(dirname $IN_FILE)/.temp.$(random).video.$(basename "$IN_FILE")";
|
||
|
|
ffmpeg -itsscale "$RATIO" -i "$IN_FILE" -c copy -an "$TEMP_VIDEO";
|
||
|
|
TEMP_AUDIO="$(dirname $IN_FILE)/.temp.$(random).audio.$(basename "$IN_FILE")";
|
||
|
|
ffmpeg -i "$IN_FILE" -filter_complex "$AUDIO_FILTER" -vn -map "[a]" "$TEMP_AUDIO";
|
||
|
|
ffmpeg -i "$TEMP_VIDEO" -i "$TEMP_AUDIO" -c:v copy -c:a copy "$OUT_FILE";
|
||
|
|
rm -f "$TEMP_AUDIO" "$TEMP_VIDEO";
|
||
|
|
else
|
||
|
|
ffmpeg -itsscale "$RATIO" -i "$IN_FILE" -c copy -an "$OUT_FILE";
|
||
|
|
fi;
|
||
|
|
}
|
||
|
|
|
||
|
|
if [ "$MODE" = "--fast" ]; then
|
||
|
|
fast;
|
||
|
|
else
|
||
|
|
slow
|
||
|
|
fi;
|