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#!/usr/bin/env bash |
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set -e |
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# Usage create-vod-hls.sh SOURCE_FILE [OUTPUT_NAME] |
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[[ ! "${1}" ]] && echo "Usage: create-vod-hls.sh SOURCE_FILE [OUTPUT_NAME]" && exit 1 |
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# comment/add lines here to control which renditions would be created |
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renditions=( |
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# resolution bitrate audio-rate |
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# "426x240 400k 64k" |
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"640x360 800k 96k" |
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"842x480 1400k 128k" |
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"1280x720 2800k 128k" |
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"1920x1080 5000k 192k" |
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) |
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segment_target_duration=4 # try to create a new segment every X seconds |
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max_bitrate_ratio=1.07 # maximum accepted bitrate fluctuations |
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rate_monitor_buffer_ratio=1.5 # maximum buffer size between bitrate conformance checks |
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######################################################################### |
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source="${1}" |
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target="${2}" |
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if [[ ! "${target}" ]]; then |
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target="${source##*/}" # leave only last component of path |
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target="${target%.*}" # strip extension |
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fi |
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mkdir -p ${target} |
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key_frames_interval="$(echo `ffprobe ${source} 2>&1 | grep -oE '[[:digit:]]+(.[[:digit:]]+)? fps' | grep -oE '[[:digit:]]+(.[[:digit:]]+)?'`*2 | bc || echo '')" |
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key_frames_interval=${key_frames_interval:-50} |
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key_frames_interval=$(echo `printf "%.1f\n" $(bc -l <<<"$key_frames_interval/10")`*10 | bc) # round |
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key_frames_interval=${key_frames_interval%.*} # truncate to integer |
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# static parameters that are similar for all renditions |
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static_params="-c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0" |
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static_params+=" -g ${key_frames_interval} -keyint_min ${key_frames_interval} -hls_time ${segment_target_duration}" |
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static_params+=" -hls_playlist_type vod" |
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# misc params |
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misc_params="-hide_banner -y" |
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master_playlist="#EXTM3U |
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#EXT-X-VERSION:3 |
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" |
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cmd="" |
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for rendition in "${renditions[@]}"; do |
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# drop extraneous spaces |
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rendition="${rendition/[[:space:]]+/ }" |
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# rendition fields |
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resolution="$(echo ${rendition} | cut -d ' ' -f 1)" |
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bitrate="$(echo ${rendition} | cut -d ' ' -f 2)" |
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audiorate="$(echo ${rendition} | cut -d ' ' -f 3)" |
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# calculated fields |
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width="$(echo ${resolution} | grep -oE '^[[:digit:]]+')" |
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height="$(echo ${resolution} | grep -oE '[[:digit:]]+$')" |
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maxrate="$(echo "`echo ${bitrate} | grep -oE '[[:digit:]]+'`*${max_bitrate_ratio}" | bc)" |
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bufsize="$(echo "`echo ${bitrate} | grep -oE '[[:digit:]]+'`*${rate_monitor_buffer_ratio}" | bc)" |
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bandwidth="$(echo ${bitrate} | grep -oE '[[:digit:]]+')000" |
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name="${height}p" |
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cmd+=" ${static_params} -vf scale=w=${width}:h=${height}:force_original_aspect_ratio=decrease" |
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cmd+=" -b:v ${bitrate} -maxrate ${maxrate%.*}k -bufsize ${bufsize%.*}k -b:a ${audiorate}" |
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cmd+=" -hls_segment_filename ${target}/${name}_%03d.ts ${target}/${name}.m3u8" |
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# add rendition entry in the master playlist |
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master_playlist+="#EXT-X-STREAM-INF:BANDWIDTH=${bandwidth},RESOLUTION=${resolution}\n${name}.m3u8\n" |
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done |
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# start conversion |
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echo -e "Executing command:\nffmpeg ${misc_params} -i ${source} ${cmd}" |
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ffmpeg ${misc_params} -i ${source} ${cmd} |
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# create master playlist file |
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echo -e "${master_playlist}" > ${target}/playlist.m3u8 |
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echo "Done - encoded HLS is at ${target}/" |
There are many iterations of 480p; use the one relevant to your most prevalent client device.
https://en.wikipedia.org/wiki/480p#Resolutions