dotfiles

commit 5094f89de1cae3b757c544b8d8f93ad0a91304e6
parent 654efacdd90da0e256bb6205ac511ce15ff4f6bd
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date:   Sat,  6 Feb 2021 10:08:29 +0100

add ffmpeg-bounce to loop a video back and forth n times

Diffstat:
A
.local/bin/ffmpeg-bounce
 | 
40
++++++++++++++++++++++++++++++++++++++++

1 file changed, 40 insertions(+), 0 deletions(-)
diff --git a/.local/bin/ffmpeg-bounce b/.local/bin/ffmpeg-bounce
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+die() {
+	printf '%s: error: %s\n' "${0%%*/}" "$1" >&2
+	exit 1
+}
+
+usage() {
+	printf '%s [-h] [-n repeats] file\n' "${0%%*/}"
+}
+
+n=5
+while :; do
+	case "$1" in
+		-h)
+			usage
+			exit 0;;
+		-n)
+			n="$2"
+			shift;;
+		-*)
+			usage
+			exit 1;;
+		*)
+			break;;
+	esac
+	shift
+done
+
+if test $# -lt 1 -o "$n" -lt 1; then
+	usage
+	exit 1
+fi
+
+n=$(( n - 1 ))
+for f in "$@"; do
+	ext="${f##*.}"
+	out="${f%.*}-bounce.${ext}"
+	ffmpeg -i "$f" -filter_complex "[0]reverse[r];[0][r]concat,loop=${n}:250,setpts=N/25/TB" "$out"
+done