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create-vod-hls.sh
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create-vod-hls.sh
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#!/usr/bin/env bash
set -e
# Usage create-vod-hls.sh SOURCE_FILE [OUTPUT_NAME]
[[ ! "${1}" ]] && echo "Usage: create-vod-hls.sh SOURCE_FILE [OUTPUT_NAME]" && exit 1
# comment/add lines here to control which renditions would be created
renditions=(
# resolution bitrate audio-rate
"240x426 400k 64k"
"360x640 800k 96k"
"450x800 1400k 128k"
"720x1280 2800k 128k"
)
segment_target_duration=2 # try to create a new segment every X seconds
max_bitrate_ratio=1.07 # maximum accepted bitrate fluctuations
rate_monitor_buffer_ratio=1.5 # maximum buffer size between bitrate conformance checks
#########################################################################
source="${1}"
target="${2}"
if [[ ! "${target}" ]]; then
target="${source##*/}" # leave only last component of path
target="${target%.*}" # strip extension
fi
mkdir -p ${target}
key_frames_interval="$(echo `ffprobe ${source} 2>&1 | grep -oE '[[:digit:]]+(.[[:digit:]]+)? fps' | grep -oE '[[:digit:]]+(.[[:digit:]]+)?'`*2 | bc || echo '')"
key_frames_interval=${key_frames_interval:-50}
key_frames_interval=$(echo `printf "%.1f\n" $(bc -l <<<"$key_frames_interval/10")`*10 | bc) # round
key_frames_interval=${key_frames_interval%.*} # truncate to integer
# static parameters that are similar for all renditions
static_params="-c:a aac -ar 48000 -c:v h264 -profile:v main -crf 28 -preset slow -sc_threshold 0"
static_params+=" -g ${key_frames_interval} -keyint_min ${key_frames_interval} -hls_time ${segment_target_duration}"
static_params+=" -hls_playlist_type vod"
# misc params
misc_params="-hide_banner -y"
master_playlist="#EXTM3U
#EXT-X-VERSION:5
"
cmd=""
for rendition in "${renditions[@]}"; do
# drop extraneous spaces
rendition="${rendition/[[:space:]]+/ }"
# rendition fields
resolution="$(echo ${rendition} | cut -d ' ' -f 1)"
bitrate="$(echo ${rendition} | cut -d ' ' -f 2)"
audiorate="$(echo ${rendition} | cut -d ' ' -f 3)"
# calculated fields
width="$(echo ${resolution} | grep -oE '^[[:digit:]]+')"
height="$(echo ${resolution} | grep -oE '[[:digit:]]+$')"
maxrate="$(echo "`echo ${bitrate} | grep -oE '[[:digit:]]+'`*${max_bitrate_ratio}" | bc)"
bufsize="$(echo "`echo ${bitrate} | grep -oE '[[:digit:]]+'`*${rate_monitor_buffer_ratio}" | bc)"
bandwidth="$(echo ${bitrate} | grep -oE '[[:digit:]]+')000"
name="${height}p"
cmd+=" ${static_params} -vf scale=w=${width}:h=${height}:force_original_aspect_ratio=decrease"
cmd+=" -b:v ${bitrate} -maxrate ${maxrate%.*}k -bufsize ${bufsize%.*}k -b:a ${audiorate}"
cmd+=" -hls_segment_filename ${target}/${name}_%03d.ts ${target}/${name}.m3u8"
# add rendition entry in the master playlist
master_playlist+="#EXT-X-STREAM-INF:BANDWIDTH=${bandwidth},RESOLUTION=${resolution}\n${name}.m3u8\n"
done
# start conversion
echo -e "Executing command:\nffmpeg ${misc_params} -i ${source} ${cmd}"
ffmpeg ${misc_params} -i ${source} ${cmd}
# create small screen master playlist file
echo -e "${master_playlist}" > ${target}/playlist-small-screen.m3u8
# create medium master playlist file
sed '3,4d' ${target}/playlist-small-screen.m3u8 > ${target}/playlist-medium-screen.m3u8
# create large screen master playlist file
sed '3,6d' ${target}/playlist-small-screen.m3u8 > ${target}/playlist-large-screen.m3u8
# create largest screen master playlist file
sed '3,8d' ${target}/playlist-small-screen.m3u8 > ${target}/playlist-largest-screen.m3u8
echo "Done - encoded HLS is at ${target}/"