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#!/bin/bash
#
# Join and encode video N-times faster.
#
set -e
# VARIABLES
SELFNAME=$(basename $0)
# FUNCTIONS
cleanup() {
rm -f "$CONCAT_FILE"
}
get_video_filter() {
echo "setpts=PTS/$1"
}
get_audio_filter() {
bc <<END
scale = 6
max = $1
f = 1
while (f < max) {
if (f * 2 > max) {
break;
}
if (f > 1) {
print ","
}
print "atempo=2.0"
f *= 2
}
if (f == max) {
} else {
print ",atempo=", max/f
}
END
}
die() {
printf "%s\n" "$1" >&2
exit 1
}
print_help() {
cat >&2 <<END
Usage: $SELFNAME [OPTIONS]... [FILE]...
Join and speed up video files.
Options:
-s, --speed speed up factor (min is 2)
-o, --output output file name (random .mp4 by default)
Example:
Speed up 16-times all MTS files in current directiory
$SELFNAME -s 16 -o out.mp4 *.MTS
END
}
# MAIN
trap cleanup EXIT
while [[ $1 = -* ]] ; do
case "$1" in
-s|--speed)
SPEED="$2"
[[ "$SPEED" -ge 2 ]] || die "Error: Speed not integer or less then 2: $SPEED"
shift
;;
-o|--output)
OUTPUT="$2"
shift
;;
-h|--help)
print_help
exit
;;
--)
shift
break
;;
*)
die "Error: Unknown option: $1"
;;
esac
shift
done
[[ -z "$SPEED" ]] && die "No speed set. See help for details"
VIDEO_FILTER=$(get_video_filter $SPEED)
AUDIO_FILTER=$(get_audio_filter $SPEED)
echo "Files to process (in order):"
for f in $* ; do
echo " $f"
done
read -p 'Press Enter to continue.'
CONCAT_FILE=$(tempfile -d .)
for f in $* ; do
echo "file '$f'" >> "$CONCAT_FILE"
done
[[ -z "$OUTPUT" ]] && OUTPUT=$(tempfile -d . --suffix .mp4)
ffmpeg -f concat -i "$CONCAT_FILE" \
-strict -2 \
-c:v libx264 -preset slow -crf 22 \
-c:a aac -b:a 128k \
-filter_complex "[0:v]$VIDEO_FILTER[v];[0:a]$AUDIO_FILTER[a]" \
-map "[v]" -map "[a]" \
-y "$OUTPUT"
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