DASH Encoding

# 16:9 Aspect ratio
#   256:144
#   426:240
#   640:360
#   854:480
#   1280:720
#   1920:1080
#   2560:1440
#   3840:2160

# 4300k 1080p
ffmpeg \
-y \
-i Sintel.2010.1080p.mkv \
-c:v libx264 \
-r 24 \
-x264opts 'keyint=48:min-keyint=48:no-scenecut' \
-vf "scale=1920:-2" \
-b:v 4300k \
-maxrate 4300k \
-movflags faststart \
-bufsize 8600k \
-profile:v main \
-preset fast \
-an \
"video_intermed_4300k.mp4"

# 1050k 480p
ffmpeg \
-y \
-i Sintel.2010.1080p.mkv \
-c:v libx264 \
-r 24 \
-x264opts 'keyint=48:min-keyint=48:no-scenecut' \
-vf scale=854:-2 \
-b:v 1050k \
-maxrate 1050k \
-movflags faststart \
-bufsize 8600k \
-profile:v main \
-preset fast \
-an \
"video_intermed_1050k.mp4"

# 235k 360p
ffmpeg \
-y \
-i Sintel.2010.1080p.mkv \
-c:v libx264 \
-r 24 \
-x264opts 'keyint=48:min-keyint=48:no-scenecut' \
-vf scale=640:-2 \
-b:v 235k \
-maxrate 235k \
-movflags faststart \
-bufsize 8600k \
-profile:v main \
-preset fast \
-an \
"video_intermed_235k.mp4"

# Audio
ffmpeg \
-y \
-i Sintel.2010.1080p.mkv \
-map 0:1 \
-vn \
-c:a aac \
-b:a 128k \
-ar 48000 \
-ac 2 \
audio1.m4a

# Audio 2
ffmpeg \
-y \
-i sintel-m+e-st.flac \
-map 0:0 \
-vn \
-c:a aac \
-b:a 128k \
-ar 48000 \
-ac 2 \
audio2.m4a

ffmpeg -y -i sintel_en.srt sintel_en.vtt
ffmpeg -y -i sintel_es.srt sintel_es.vtt
ffmpeg -y -i sintel_de.srt sintel_de.vtt

mp4box -add "sintel_en.vtt:lang=en" subtitle_en.mp4
mp4box -add "sintel_es.vtt:lang=es" subtitle_es.mp4
mp4box -add "sintel_de.vtt:lang=de" subtitle_de.mp4

mp4box \
-dash 4000 \
-frag 4000 \
-rap \
-segment-name 'segment_$RepresentationID$_' \
-fps 24 \
"video_intermed_235k.mp4#video:id=240p" \
"video_intermed_1050k.mp4#video:id=480p" \
"video_intermed_4300k.mp4#video:id=1080p" \
"audio1.m4a#audio:id=English:role=main" \
"audio2.m4a#audio:id=Dubbed:role=dub" \
"subtitle_en.mp4:role=subtitle" \
"subtitle_es.mp4:role=subtitle" \
"subtitle_de.mp4:role=subtitle" \
-out dash/playlist.mpd

cd dash
# https://myshittycode.com/2014/07/24/os-x-sed-extra-characters-at-the-end-of-l-command-error/
sed -i '' 's|mimeType="video/mp4" codecs="wvtt"|mimeType="application/mp4" codecs="wvtt"|g' playlist.mpd