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	tPut image->video processing into separate script - bitreich-tv - meme tv encod…
	git clone git://src.adamsgaard.dk/bitreich-tv
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	commit 469296142ed571c3e38749a234a9eb31205645ac
	parent 9712aec3da3a8dd8e17f8626c138ae12c26e9c8c
	Author: Anders Damsgaard <[email protected]>
	Date: Sun, 16 Aug 2020 21:33:26 +0200

	Put image->video processing into separate script

	Diffstat:
	A brtv-imgs-to-video.sh \| 78 +++++++++++++++++++++++++++++…

	1 file changed, 78 insertions(+), 0 deletions(-)
	---
	diff --git a/brtv-imgs-to-video.sh b/brtv-imgs-to-video.sh
	t@@ -0,0 +1,78 @@
	+#!/bin/sh
	+# read hashtags.txt as stdin, download all images, and convert them to videos
	+# requirements: hurl(1), ffmpeg(1), convert(1)
	+
	+
	+### CONFIGURATION START
	+
	+# dir to contain images as videos
	+out_dir="img2vid"
	+
	+# ffmpeg flags for generated videos
	+video_ext="webm"
	+ffmpeg_codec="-loglevel error -acodec libopus -b:a 96K -vcodec libvpx -b:v 64k…
	+
	+# target video resolution
	+video_resolution=1280x720
	+
	+# slide style
	+bgcolor=magenta
	+
	+# show image memes for this duration [s]
	+image_display_time=10
	+
	+### CONFIGURATION END
	+
	+
	+die() {
	+ printf '%s: error: %s\n' "${0##*/}" "$1" >&2
	+ exit 1
	+}
	+
	+regeximatch() {
	+ printf '%s' "$1" \| grep -iEq "$2"
	+}
	+
	+fit_img_16_9() {
	+ convert -resize "$video_resolution"\> -size "$video_resolution" "$1" \
	+ xc:"$bgcolor" +swap -gravity center -composite "$2"
	+}
	+
	+video_from_img() {
	+ ffmpeg -y \
	+ -f lavfi \
	+ -i anullsrc=r=48000 \
	+ -i "$1" \
	+ -t "${image_display_time}" \
	+ $ffmpeg_codec \
	+ "$2" < /dev/null
	+}
	+
	+mkdir -p "$out_dir"
	+
	+# generate video from each image
	+# TODO: deal with .gif
	+while read -r tag url; do
	+ if ! regeximatch "$url" '\.(jpg\|jpeg\|png)$'; then
	+ continue
	+ fi
	+
	+ imgfile="${out_dir}/${url##*/}"
	+ out="${imgfile%.*}.${video_ext}"
	+
	+ if [ ! -f "$out" ]; then
	+
	+ if [ ! -f "$imgfile" ]; then
	+ if ! hurl "$url" > "$imgfile"; then
	+ die "hurl could not download $url"
	+ fi
	+ fi
	+
	+ if ! regeximatch "$(file -ib "$imgfile")" "^image\/"; then
	+ die "input image $imgfile is invalid ($(file -b "$imgf…
	+ fi
	+ fit_img_16_9 "$imgfile" "${out%.*}_16-9.jpg"
	+ video_from_img "${out%.${video_ext}}_16-9.jpg" "${out}"
	+ printf '%s\n' "$out"
	+ fi
	+done