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Organization

FFMPEGでライブのCMAF (HLS + MPEG-DASH) の作成方法

はじめに

こんにちは streampack チームのメディです。
https://cloudpack.jp/service/option/streampack.html

Copyrights

Big Buck Bunny
© copyright 2008, Blender Foundation | www.bigbuckbunny.org

What is CMAF ・ CMAFとは

CMAF means Common media application format
In order to simplify let's say that CMAF has support for both MPEG-DASH and HLS. You just need to create your video segments once. Both of the manifests (MPD & m3u8) will use the same video segments.

CMAFは「Common media application format」を意味します。
単純化するため、CMAFがMPEG-DASHとHLSの両方をサポートしているとしましょう。 あなたは一度あなたのビデオセグメントを作成する必要があります。 両方のマニフェスト(MPDm3u8)は同じビデオセグメントを使用します。

Objective・目的

Learning how to create a CMAF compliant Live ABR video stream.
ライブのCMAFのABRビデオストリームの簡単な例を学ぶこと。

Tools ・ツール

FFMPEG

FFMPEG will encode the video file.
FFMPEGはビデオファイルをエンコードします。
I am using a static build of FFMPEG v4.1.
FFMPEG「v4.1」の静的ビルドを使用しています。

FFMPEG static builds ・ FFMPEG静的ビルド

FFMPEG command ・ FFMPEGの使い方

./ffmpeg -re -stream_loop -1  -i ~/Documents/videos/BigBuckBunny.mp4 \
-map 0 -map 0 -map 0 -c:a aac -c:v libx264 \
-b:v:0 800k -s:v:0 1280x720 -profile:v:0 main \
-b:v:1 500k -s:v:1 640x340  -profile:v:1 main \
-b:v:2 300k -s:v:2 320x170  -profile:v:2 baseline \
-bf 1 \
-keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \
-window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" -hls_playlist 1 -seg_duration 4 -streaming 1 -remove_at_exit 1 -f dash manifest.mpd

Encode faster with a GPU ・ GPUで高速エンコード

If you are using a Mac, you can replace -c:v libx264 by -c:v h264_videotoolbox -allow_sw 1 , it will use the GPU when available.
Macを使用している場合、 -c:v libx264-c:v h264_videotoolbox -allow_sw 1に置き換えることができます。利用可能な場合はGPUを使用します。

If you have a nvidia card, I wrote a more derailed article here.
Nvidiaグラフィックボードに興味がある場合は、より詳細な記事

Player ・ プレーヤー

In the following examples, I am using Clappr player.
次の例では、私はClapprプレーヤーを使っています。

Clappr is an open sources javascript media player.
Clappr はオープンソースのjavascriptメディアプレーヤーです。

If you are interested in Clappr, I wrote a more detailed article.
Clappr に興味がある場合は、より詳細な記事にあります。

HLS player

Screen Shot 2019-04-19 at 10.27.42.png

<head>
  <title>Clappr Player</title>
  <meta charset="UTF-8">
  <!-- Player -->
  <script type="text/javascript" src="//cdn.jsdelivr.net/npm/clappr@latest/dist/clappr.min.js"></script>
  <!-- Quality selector -->
  <script type="text/javascript" src="//cdn.jsdelivr.net/gh/clappr/clappr-level-selector-plugin@latest/dist/level-selector.min.js"></script>
</head>

<body>
  <div id="player"></div>
  <script>
    Clappr.Log.setLevel(Clappr.Log.LEVEL_DEBUG);
    var player = new Clappr.Player({
      source: "master.m3u8",
      parentId: "#player",
      mute: true,
      autoPlay: true,
      plugins: {
        core: [LevelSelector]
      },
      levelSelectorConfig: {
        title: '動画品質',
      },
    });
  </script>
</body>

DASH player

Screen Shot 2019-04-19 at 10.34.08.png

<head>
  <title>Clappr Player</title>
  <meta charset="UTF-8">
  <!-- Player -->
  <script type="text/javascript" src="//cdn.jsdelivr.net/npm/clappr@latest/dist/clappr.min.js"></script>
  <!-- DASH  -->
  <script type="text/javascript" src="//cdn.jsdelivr.net/npm/dash-shaka-playback@2.2.1/dist/dash-shaka-playback.min.js"></script>
</head>

<body>
  <div id="player"></div>
  <script>
    Clappr.Log.setLevel(Clappr.Log.LEVEL_DEBUG);
    var player = new Clappr.Player({
      source: "manifest.mpd",
      parentId: "#player",
      mute: true,
      autoPlay: true,
      plugins: {
       playback:[DashShakaPlayback]
     },
    });
  </script>
</body>

Information sources ・ 情報元

https://www.ffmpeg.org/ffmpeg-all.html
http://clappr.io/

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