#!/bin/bash
# create "poster" files for an image preview if livestream before the user clicks play

# get all live streams
all_live=`ls /tmp/hls/*.m3u8 | cut -d/ -f4 | cut -d. -f1 | uniq`

# for each streamer, make a poster of their latest video chunk
while read -r streamer
do
	tsfile=`bash -c "ls -t /tmp/hls/$streamer-*.ts" | head -n1`
	ffmpeg -hide_banner -loglevel error -y \
		 -ss 00:00:00.00 -i "$tsfile" \
		 -frames:v 1 "/var/www/stream/public/posters/$streamer.jpg" < /dev/null;
done <<< "$all_live"

# delete old posters
bash -c 'find /var/www/stream/public/posters/*.jpg -mmin +2 -exec rm {} \;'