Add script

README.md

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+
+Have you ever wanted to create a powerhour using different clips of the same song, and incrementally speeding them up as the powerhour progresses?

powerhour.sh

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+#!/usr/bin/env bash
+
+if [ $# -ne 1 ]; then
+  echo "Usage: $0 <filename>"
+  exit 1
+fi
+
+if [ ! -f $1 ]; then
+  echo "$1 is not a file"
+fi
+
+file=$1
+
+FFMPEG="docker run -ti --rm -v $(pwd):/data -w /data linuxserver/ffmpeg"
+FFPROBE="docker run -ti --rm -v $(pwd):/data -w /data --entrypoint ffprobe linuxserver/ffmpeg"
+
+CLIP_LEN=60
+
+audio_len=$($FFPROBE -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 $file | tr -d '\r\n')
+audio_len=${audio_len%.*}
+max_start=$(expr $audio_len - $CLIP_LEN)
+
+# first make a bunch of 60s clips with random start positions
+for i in $(seq 0 59); do
+  rand_start=$(($RANDOM % $max_start))
+  outfile="clip-$i.wav"
+  $FFMPEG -ss $rand_start -t 60 -i $file $outfile
+done
+
+# next loop over those clips and shrink them appropriately
+for i in $(seq 0 59); do
+  infile="clip-$i.wav"
+  outfile="clip-$i-adj.wav"
+  tempo=$(eval printf 'atempo=0.95\;%.0s' {1..$i})
+  $FFMPEG -i $infile -filter:a "$tempo" -vn $outfile
+done
+
+# stitch em together
+# Using a file here because i need to access it in docker
+>_concat; for i in $(seq 0 59); do echo "file clip-$i-adj.wav" >>_concat; done
+
+ffmpeg -f concat -safe 0 -i _concat -c copy powerhour.wav