ddennedy · July 27, 2022 03:44 · azhar5678 · Sep 5, 2019
diff --git a/dash-avc264 command lines b/dash-avc264 command lines
 See my DASH-IF presentation from October, 2014:
 https://s3.amazonaws.com/misc.meltymedia/dash-if-reveal/index.html#/

 1. encode multiple bitrates with keyframe alignment:
   ffmpeg -i ~/Movies/5D2_Portrait.MOV -s 1280x720 -c:v libx264 -b:v 1450k -bf 2 \
     -g 90 -sc_threshold 0 -c:a aac -strict experimental -b:a 96k -ar 32000 out.mp4

   My input was 30 fps = 3000 ms. If it were 29.97, then a GOP size of 90 frames will yield a base segment
   size of 3003 milliseconds. You can make the segment size some multiple of this, e.g.: 6006, 9009, 12012.

   You could encode to other resolutions and bitrates here, and if you do, you might want to skip the audio
   encoding for them. To do that replace "-c:a aac -strict experimental -b:a 96k -ar 32000" with "-an".

 2. verify keyframes:
   ffprobe -show_frames -print_format compact out.mp4 | less
   => too difficult to read

   ffprobe -show_frames -print_format compact out.mp4 |
     awk -F '|' '($2 == "media_type=video") {print i++, $3}' | less
   => Now we can just see video key frame indication - better, but let's filter it more.

   ffprobe -show_frames -print_format compact out.mp4 |
     awk -F '|' '($2 == "media_type=video") {if ($3 == "key_frame=1") print i, $3; ++i}'
   => Now we can just see frame# of frames that are a key frame and verify they are multiples of 90.
      At this point, we could extend the awk with a test on i modulo 90 and exit with result
      code 1 to signal failure in an automated script.

 3. segment and generate mpd:
   mp4box -dash 3000 -rap -profile dashavc264:onDemand out.mp4#audio out.mp4#video
   => generates out_dash.mp4 and out_track?_dashinit.mp4
   If you have multiple files at different bitrates, just add them to the end of the command
   line, but there will be more _track_dashinit.mp4 files you need to ensure you upload.  

 4. test locally:
   Osmo4 out_dash.mpd

 5. view mp4 dump:
   mp4box -diso -stdb out_track1_dashinit.mp4 2>&1 | xmllint -format -
   or, mp4dump out_track1_dashinit.mp4

 6. upload to web server:
   s3cmd put --acl-public out_dash.mpd out_track?_dashinit.mp4 s3://${S3BUCKET}/dash/

 7. validate mpd:
   http://dashif.org/conformance.html
   copy-and-paste: http://${S3BUCKET}.s3.amazonaws.com/dash/out_dash.mpd

 8. play with dashif.org test player:
   http://dashif.org/reference/players/javascript/1.0.0/index.html?mpd=http://${S3BUCKET}.s3.amazonaws.com/dash/out_dash.mpd

 9. embed in own web page using video.js and dash.js:
   s3cmd put --acl-public --recursive videojs-dash/* s3://${S3BUCKET}/videojs/
   open http://${S3BUCKET}.s3.amazonaws.com/dash/videojs.html
diff --git a/videojs.html b/videojs.html
 <!DOCTYPE html>
 <html>
 <head>
  <meta charset="utf-8" />
  <title>Video.js DASH-AVC/264</title>

  <!-- Video.JS -->
  <link href="/videojs/video-js.css" rel="stylesheet">
  <script src="/videojs/video.dev.js"></script>

  <!-- Dash.JS -->
  <script src="https://rawgit.com/Dash-Industry-Forum/dash.js/master/dash.min.js"></script>

  <!-- Video.JS Tech Loads -->
  <!-- videojs-dashjs -->
  <!--   <script src="https://rawgit.com/Dash-Industry-Forum/dash.js/master/contrib/videojs/videojs-tech-dashjs.js"></script> -->
  <script src="/videojs/videojs-tech-dashjs.js"></script>
 </head>

 <body>
  <video id="vid1" class="video-js vjs-default-skin" data-setup='{}'
    width="854" height="480" controls preload="auto">
    <source src="/dash/out_dash.mpd" type="application/dash+xml">
  </video>
 </body>
 </html>
	See my DASH-IF presentation from October, 2014:
	https://s3.amazonaws.com/misc.meltymedia/dash-if-reveal/index.html#/

	1. encode multiple bitrates with keyframe alignment:
	ffmpeg -i ~/Movies/5D2_Portrait.MOV -s 1280x720 -c:v libx264 -b:v 1450k -bf 2 \
	-g 90 -sc_threshold 0 -c:a aac -strict experimental -b:a 96k -ar 32000 out.mp4

	My input was 30 fps = 3000 ms. If it were 29.97, then a GOP size of 90 frames will yield a base segment
	size of 3003 milliseconds. You can make the segment size some multiple of this, e.g.: 6006, 9009, 12012.

	You could encode to other resolutions and bitrates here, and if you do, you might want to skip the audio
	encoding for them. To do that replace "-c:a aac -strict experimental -b:a 96k -ar 32000" with "-an".

	2. verify keyframes:
	ffprobe -show_frames -print_format compact out.mp4 \| less
	=> too difficult to read

	ffprobe -show_frames -print_format compact out.mp4 \|
	awk -F '\|' '($2 == "media_type=video") {print i++, $3}' \| less
	=> Now we can just see video key frame indication - better, but let's filter it more.

	ffprobe -show_frames -print_format compact out.mp4 \|
	awk -F '\|' '($2 == "media_type=video") {if ($3 == "key_frame=1") print i, $3; ++i}'
	=> Now we can just see frame# of frames that are a key frame and verify they are multiples of 90.
	At this point, we could extend the awk with a test on i modulo 90 and exit with result
	code 1 to signal failure in an automated script.

	3. segment and generate mpd:
	mp4box -dash 3000 -rap -profile dashavc264:onDemand out.mp4#audio out.mp4#video
	=> generates out_dash.mp4 and out_track?_dashinit.mp4
	If you have multiple files at different bitrates, just add them to the end of the command
	line, but there will be more _track_dashinit.mp4 files you need to ensure you upload.

	4. test locally:
	Osmo4 out_dash.mpd

	5. view mp4 dump:
	mp4box -diso -stdb out_track1_dashinit.mp4 2>&1 \| xmllint -format -
	or, mp4dump out_track1_dashinit.mp4

	6. upload to web server:
	s3cmd put --acl-public out_dash.mpd out_track?_dashinit.mp4 s3://${S3BUCKET}/dash/

	7. validate mpd:
	http://dashif.org/conformance.html
	copy-and-paste: http://${S3BUCKET}.s3.amazonaws.com/dash/out_dash.mpd

	8. play with dashif.org test player:
	http://dashif.org/reference/players/javascript/1.0.0/index.html?mpd=http://${S3BUCKET}.s3.amazonaws.com/dash/out_dash.mpd

	9. embed in own web page using video.js and dash.js:
	s3cmd put --acl-public --recursive videojs-dash/* s3://${S3BUCKET}/videojs/
	open http://${S3BUCKET}.s3.amazonaws.com/dash/videojs.html
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8" />
	<title>Video.js DASH-AVC/264</title>

	<!-- Video.JS -->
	<link href="/videojs/video-js.css" rel="stylesheet">
	<script src="/videojs/video.dev.js"></script>

	<!-- Dash.JS -->
	<script src="https://rawgit.com/Dash-Industry-Forum/dash.js/master/dash.min.js"></script>

	<!-- Video.JS Tech Loads -->
	<!-- videojs-dashjs -->
	<!-- <script src="https://rawgit.com/Dash-Industry-Forum/dash.js/master/contrib/videojs/videojs-tech-dashjs.js"></script> -->
	<script src="/videojs/videojs-tech-dashjs.js"></script>
	</head>

	<body>
	<video id="vid1" class="video-js vjs-default-skin" data-setup='{}'
	width="854" height="480" controls preload="auto">
	<source src="/dash/out_dash.mpd" type="application/dash+xml">
	</video>
	</body>
	</html>