mrbar42 · November 13, 2024 21:57 · cyango · Jun 18, 2020 · waakobrian · Jun 28, 2020
diff --git a/README.md b/README.md
diff --git a/create-vod-hls.sh b/create-vod-hls.sh
 #!/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
 #  "426x240    400k    64k"
  "640x360    800k     96k"
  "842x480    1400k    128k"
  "1280x720   2800k    128k"
  "1920x1080  5000k    192k"
 )

 segment_target_duration=4       # 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 20 -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:3
 "
 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 master playlist file
 echo -e "${master_playlist}" > ${target}/playlist.m3u8

 echo "Done - encoded HLS is at ${target}/"
	#!/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
	# "426x240 400k 64k"
	"640x360 800k 96k"
	"842x480 1400k 128k"
	"1280x720 2800k 128k"
	"1920x1080 5000k 192k"
	)

	segment_target_duration=4 # 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 20 -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:3
	"
	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 master playlist file
	echo -e "${master_playlist}" > ${target}/playlist.m3u8

	echo "Done - encoded HLS is at ${target}/"