Dash is the open-source equivalent of Apple's HLS technology, used for the same purpose: to deliver live videos or on-demand videos over the web, dynamically changing the quality based on the internet connection of the final user.
HlS it's a standard created by apple in order to deliver audio/video streaming using ordinary web servers.
Following formula will produce a multi-bit-rate version of our master with h264 constrained encoding
ffmpeg -i input.mp4 -c:v h264 -crf 22 -tune film -profile:v main -level:v 4.0 -maxrate 5000k -bufsize 10000k -r 25 -keyint_min 25 -g 50 -sc_threshold 0 -c:a aac -ar 44100 -b:a 128k -ac 2 -pix_fmt yuv420p -movflags +faststart 1080.mp4 -s 1280x720 -c:v h264 -crf 24 -tune film -profile:v main -level:v 4.0 -maxrate 2500k -bufsize 5000k -r 25 -keyint_min 25 -g 50 -sc_threshold 0 -c:a aac -ar 44100 -b:a 128k -ac 2 -pix_fmt yuv420p -movflags +faststart 720.mp4 -s 854x480 -c:v h264 -crf 30 -tune film -profile:v main -level:v 4.0 -maxrate 1250k -bufsize 2500k -r 25 -keyint_min 25 -g 50 -sc_threshold 0 -c:a aac -ar 44100 -b:a 96k -ac 2 -pix_fmt yuv420p -movflags +faststart 480.mp4 -s 640x360 -c:v h264 -crf 33 -tune film -profile:v main -level:v 4.0 -maxrate 900k -bufsize 1800k -r 25 -keyint_min 25 -g 50 -sc_threshold 0 -c:a aac -ar 44100 -b:a 96k -ac 2 -pix_fmt yuv420p -movflags +faststart 360.mp4 -s 320x24 -c:v h264 -crf 36 -tune film -profile:v main -level:v 4.0 -maxrate 625k -bufsize 1250k -r 25 -keyint_min 25 -g 50 -sc_threshold 0 -c:a aac -ar 22050 -b:a 64k -ac 1 -pix_fmt yuv420p -movflags +faststart 240.mp4
All tags described in my previous blog
Create multi-bitrate DASH and HLS playlist with Shaka packager
Shaka packager official documentation, check_out installation and user guide from their official doc
./packager-linux-x64 in=1080.mp4,stream=audio,output=audio.mp4,playlist_name=audio.m3u8,hls_group_id=audio,hls_name=ENGLISH \
in=1080.mp4,stream=video,output=h264_1080.mp4,playlist_name=h264_1080p.m3u8,iframe_playlist_name=h264_1080p_iframe.m3u8 \
in=480.mp4,stream=video,output=h264_480p.mp4,playlist_name=h264_480p.m3u8,iframe_playlist_name=h264_480p_iframe.m3u8 \
in=360.mp4,stream=video,output=h264_360p.mp4,playlist_name=h264_360p.m3u8,iframe_playlist_name=h264_360p_iframe.m3u8 \
in=240.mp4,stream=video,output=h264_240p.mp4,playlist_name=h264_240p.m3u8,iframe_playlist_name=h264_240p_iframe.m3u8 \
--hls_master_playlist_output h264_master.m3u8 \
--mpd_output h264.mpd
Explanation
in : in=your_input_video.mp4, input command
stream : stream=audio for extract only audio file from input file and stream=video for extract only video file from input file
Previously we got different chunk file for different resolution from FFmpeg previous command like 1080.mp4,720.mp4,480.mp4 etc.
For making playlist we have to put respected file one by one
in=1080.mp4,stream=video,output=h264_1080.mp4,playlist_name=h264_1080p.m3u8,iframe_playlist_name=h264_1080p_iframe.m3u8 \
in=480.mp4,stream=video,output=h264_480p.mp4,playlist_name=h264_480p.m3u8,iframe_playlist_name=h264_480p_iframe.m3u8 \
in=360.mp4,stream=video,output=h264_360p.mp4,playlist_name=h264_360p.m3u8,iframe_playlist_name=h264_360p_iframe.m3u8 \
in=240.mp4,stream=video,output=h264_240p.mp4,playlist_name=h264_240p.m3u8,iframe_playlist_name=h264_240p_iframe.m3u8 \
--hls_master_playlist_output: Generator master playlist for hls streaming
--mpd_output h264.mpd: Generator master playlist for dash streaming
Top comments (0)