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	brtv-imgs-to-video.sh - bitreich-tv - Meme TV encoding and streaming
	git clone git://bitreich.org/bitreich-tv git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfr…
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	brtv-imgs-to-video.sh (1698B)
	---
	1 #!/bin/sh
	2 # read hashtags.txt as stdin, download all images, and convert them to v…
	3 # requirements: hurl(1), ffmpeg(1), convert(1)
	4
	5 ### CONFIGURATION START
	6
	7 # dir to contain images as videos
	8 out_dir="/br/gopher/tv/img2vid"
	9
	10 # ffmpeg flags for generated videos
	11 video_ext="webm"
	12 ffmpeg_codec="-loglevel error -acodec libopus -b:a 96K -f webm -vf scale…
	13
	14 # target video resolution
	15 video_resolution=1280x720
	16
	17 # slide style
	18 # xc:$color ( https://imagemagick.org/script/color.php )
	19 # /some/file.png
	20 bgcontent=/br/gopher/tv/bitreich-tv-bg.png
	21
	22 # show image memes for this duration [s]
	23 image_display_time=10
	24
	25 ### CONFIGURATION END
	26
	27
	28 die() {
	29 printf '%s: error: %s\n' "${0##*/}" "$1" >&2
	30 exit 1
	31 }
	32
	33 regeximatch() {
	34 printf '%s' "$1" \| grep -iEq "$2"
	35 }
	36
	37 fit_img_16_9() {
	38 convert -resize "$video_resolution" -size "$video_resolution" "$…
	39 "$bgcontent" +swap -gravity center -composite "$2"
	40 }
	41
	42 video_from_img() {
	43 ffmpeg -y \
	44 -f lavfi \
	45 -i anullsrc=r=48000 \
	46 -i "$1" \
	47 -t "${image_display_time}" \
	48 $ffmpeg_codec \
	49 "$2" < /dev/null
	50 }
	51
	52 mkdir -p "$out_dir"
	53
	54 # generate video from each image
	55 while read -r tag url; do
	56 if ! regeximatch "$url" '\.(jpg\|jpeg\|png\|gif)$'; then
	57 continue
	58 fi
	59
	60 imgfile="${out_dir}/${url##*/}"
	61 out="${imgfile%.*}.${video_ext}"
	62
	63 if [ ! -f "$out" ]; then
	64
	65 if [ ! -f "$imgfile" ]; then
	66 if ! hurl "$url" > "$imgfile"; then
	67 die "hurl could not download $url"
	68 fi
	69 fi
	70
	71 if ! regeximatch "$(file -ib "$imgfile")" "^image\/"; th…
	72 die "input image $imgfile is invalid ($(file -b …
	73 fi
	74 fit_img_16_9 "$imgfile" "${out%.*}_16-9.jpg"
	75 video_from_img "${out%.${video_ext}}_16-9.jpg" "${out}"
	76 printf '%s\n' "$out"
	77 fi
	78 done