From 299bed21b766fb48a3d976842bee32327eb142a7 Mon Sep 17 00:00:00 2001
From: RealStickman <mrc@frm01.net>
Date: Sat, 24 Jul 2021 16:53:42 +0200
Subject: [PATCH] Add script to remove black sections from video that are
 longer than 2 seconds

---
 .../scripts/pieces/ffmpeg-cut-black.sh        | 87 +++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100755 arch-config/scripts/pieces/ffmpeg-cut-black.sh

diff --git a/arch-config/scripts/pieces/ffmpeg-cut-black.sh b/arch-config/scripts/pieces/ffmpeg-cut-black.sh
new file mode 100755
index 00000000..456c442d
--- /dev/null
+++ b/arch-config/scripts/pieces/ffmpeg-cut-black.sh
@@ -0,0 +1,87 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if $# -ne 1; then
+    echo "Please provide the path to one video file"
+    $(exit 1); echo "$?"
+fi
+
+echo "Getting black screen times"
+
+# reads the output of ffprobe into an array
+mapfile -t timings < <(ffprobe -f lavfi -i "movie=$1,blackdetect[out0]" -show_entries frame_tags=lavfi.black_start,lavfi.black_end -of default=nw=1 -v quiet -print_format flat)
+
+#timings=(frames.frame.0.tags.lavfi_black_start="0.389" frames.frame.1.tags.lavfi_black_end="0.431" frames.frame.255.tags.lavfi_black_start="11.025" frames.frame.256.tags.lavfi_black_end="11.067")
+
+seltimings=()
+
+for i in "${!timings[@]}"; do
+    # cut timing to only output the time
+    timing="$(echo ${timings[$i]} | cut -d= -f2 | tr -d '"')"
+    if [ $((${i}%2)) -eq 0 ]; then
+        starttime=$timing
+        #echo "Start time: $starttime"
+    else
+        endtime=$timing
+        #echo "End time: $endtime"
+        timediff="$(echo "(($endtime - $starttime))" | bc -l)"
+        #echo "Difference: $timediff"
+        # check for sections longer than 2 seconds
+        if (( $(echo "$timediff > 2" | bc -l) )); then
+            echo "Start time: $starttime"
+            echo "End time: $endtime"
+            echo "Difference: $timediff"
+            seltimings+=($starttime)
+            seltimings+=($endtime)
+        fi
+    fi
+done
+
+for i in "${seltimings[@]}"; do
+    echo $i
+done
+
+# track split files created
+splitfiles=()
+
+# build command
+command="ffmpeg -i "$1" -c copy -map 0 -t ${seltimings[0]} "1.mkv""
+splitfiles+=("1.mkv")
+echo "file 1.mkv" > "list.txt"
+
+tmp=$(( ${#seltimings[@]} - 2 ))
+length=$(( $tmp / 2 ))
+
+selector=1
+
+n=0
+
+while [[ $n -lt $length ]]; do
+    n=$((n+1))
+    up=$(( $selector + 1 ))
+    low=$selector
+    command+=" -c copy -map 0 -ss ${seltimings[$low]} -t $(echo "${seltimings[$up]} - ${seltimings[$low]}" | bc -l) "$(( $n + 1 )).mkv""
+    splitfiles+=("$(( $n + 1 )).mkv")
+    echo "file $(( $n + 1 )).mkv" >> "list.txt"
+    selector=$(( $selector + 2 ))
+done
+
+lastsel=$(( ${#seltimings[@]} - 1 ))
+command+=" -c copy -map 0 -ss ${seltimings[$lastsel]} "$(( $n + 2 )).mkv""
+splitfiles+=("$(( $n + 2 )).mkv")
+echo "file $(( $n + 2)).mkv" >> "list.txt"
+
+echo "Running command"
+echo "$command" | tee command.sh
+bash command.sh
+
+ffmpeg -f concat -i "list.txt" -c copy -map 0 "out-${1}"
+
+# cleanup
+rm command.sh
+rm list.txt
+for file in ${splitfiles[@]}; do
+    rm "$file"
+done
+
+$(exit 0); echo "$?"