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#!/bin/sh
# Give a file with images and timecodes and creates a video slideshow of them.
#
# Timecodes must be in format 00:00:00.
#
# Imagemagick and ffmpeg required.
# Application cache if not stated elsewhere.
cache="${XDG_CACHE_HOME:-$HOME/.cache}/slider"
while getopts "hvrpi:c:a:o:d:f:t:e:x:" o; do case "${o}" in
c) bgc="$OPTARG" ;;
t) fgc="$OPTARG" ;;
i) file="$OPTARG" ;;
a) audio="$OPTARG" ;;
o) outfile="$OPTARG" ;;
d) prepdir="$OPTARG" ;;
r) redo="$OPTARG" ;;
s) ppt="$OPTARG" ;;
e) endtime="$OPTARG" ;;
x) res="$OPTARG"
echo "$res" | grep -qv "^[0-9]\+x[0-9]\+$" &&
echo "Resolution must be dimensions separated by a 'x': 1280x720, etc." &&
exit 1 ;;
p) echo "Purge old build files in $cache? [y/N]"
read -r confirm
echo "$confirm" | grep -iq "^y$" && rm -rf "$cache" && echo "Done."
exit ;;
v) verbose=True ;;
*) echo "$(basename "$0") usage:
-i input timecode list (required)
-a audio file
-c color of background (use html names, black is default)
-t text color for text slides (white is default)
-s text font size for text slides (150 is default)
-o output video file
-e if no audio given, the time in seconds that the last slide will be shown (5 is default)
-x resolution (1920x1080 is default)
-d tmp directory
-r rerun imagemagick commands even if done previously (in case files or background has changed)
-p purge old build files instead of running
-v be verbose" && exit 1
esac done
# Check that the input file looks like it should.
{ head -n 1 "$file" 2>/dev/null | grep -q "^00:00:00 " ;} || {
echo "Give an input file with -i." &&
echo "The file should look as this example:
00:00:00 first_image.jpg
00:00:03 otherdirectory/next_image.jpg
00:00:09 this_image_starts_at_9_seconds.jpg
etc...
Timecodes and filenames must be separated by Tabs." &&
exit 1
}
if [ -n "${audio+x}" ]; then
# Check that the audio file looks like an actual audio file.
case "$(file --dereference --brief --mime-type -- "$audio")" in
audio/*) ;;
*) echo "That doesn't look like an audio file."; exit 1 ;;
esac
totseconds="$(date '+%s' -d $(ffmpeg -i "$audio" 2>&1 | awk '/Duration/ {print $2}' | sed s/,//))"
endtime="$((totseconds-seconds))"
fi
prepdir="${prepdir:-$cache/$file}"
outfile="${outfile:-$file.mp4}"
prepfile="$prepdir/$file.prep"
[ -n "${verbose+x}" ] && echo "Preparing images... May take a while depending on the number of files."
mkdir -p "$prepdir"
{
while read -r x;
do
# Get the time from the first column.
time="${x%% *}"
seconds="$(date '+%s' -d "$time")"
# Duration is not used on the first looped item.
duration="$((seconds - prevseconds))"
# Get the filename/text content from the rest.
content="${x#* }"
base="$(basename "$content")"
base="${base%.*}.jpg"
if [ -f "$content" ]; then
# If images have already been made in a previous run, do not recreate
# them unless -r was given.
{ [ ! -f "$prepdir/$base" ] || [ -n "${redo+x}" ] ;} &&
convert -size "${res:-1920x1080}" canvas:"${bgc:-black}" -gravity center "$content" -resize 1920x1080 -composite "$prepdir/$base"
else
{ [ ! -f "$prepdir/$base" ] || [ -n "${redo+x}" ] ;} &&
convert -size "${res:-1920x1080}" -background "${bgc:-black}" -fill "${fgc:-white}" -pointsize "${ppt:-150}" -gravity center label:"$content" "$prepdir/$base"
fi
# If the first line, do not write yet.
[ "$time" = "00:00:00" ] || echo "file '$prevbase'
duration $duration"
# Keep the information required for the next file.
prevbase="$base"
prevtime="$time"
prevseconds="$(date '+%s' -d "$prevtime")"
done < "$file"
# Do last file which must be given twice as follows
echo "file '$base'
duration ${endtime:-5}
file '$base'"
} > "$prepfile"
if [ -n "${audio+x}" ]; then
ffmpeg -hide_banner -y -f concat -safe 0 -i "$prepfile" -i "$audio" -c:a aac -vsync vfr -c:v libx264 -pix_fmt yuv420p "$outfile"
else
ffmpeg -hide_banner -y -f concat -safe 0 -i "$prepfile" -vsync vfr -c:v libx264 -pix_fmt yuv420p "$outfile"
fi
# Might also try:
# -vf "fps=${fps:-24},format=yuv420p" "$outfile"
# but has given some problems.