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      • Pie Noon - 1503060393
      • The Death of Base Game Activity - 1504030543
      • Surviving OpenGL Context Loss - 1504030546
      • WebP for Game Devs - 1504030547
      • Saved Games In-Depth (Part 1) - 1504070556
      • Saved Games In-Depth (Part 2) - 1504030548
      • Smaller Flipbook Textures with CRABBY - 1504030544
      • Google Tag Manager - 1504030545
      • Flatbuffers - 1505050794
      • Achievement Point Pointers - 1505050796
      • Frequency Scaling - 1505050797
      • Meet the Management APIs - 1501140367
      • Y U Ship Broken Games - 1505050795
    • Android 性能优化 - 088
      • Garbage Collection in Android - 1503170425
      • Performance Cost of Memory Leaks - 1503170424
      • Rendering Performance 101 - 1501130351
      • Understanding Overdraw - 1501130352
      • Understanding VSYNC - 1501130353
      • Tool - Profile GPU Rendering - 1501130354
      • Why 60fps? - 1501130355
      • Android UI and the GPU - 1501130356
      • Invalidations, Layouts, and Performance - 1501130357
      • Overdraw, Cliprect, QuickReject - 1501130358
      • Tool - Memory Monitor - 1501130363
      • Battery Performance 101 - 1501130364
      • Understanding Battery Drain on Android - 1501130365
      • Battery Drain and WakeLocks - 1501130366
      • Memory Performance 101 - 1504170661
    • I/O 2014 Android 开发专题 - 089
      • Activity Transitions - 1504020505
      • Building Apps For Android TV - 1504020520
      • Building great Android media experiences - 1504020510
      • Building a quality app from start to finish - 1504020515
      • App Indexing API - 1504020507
      • What's new in WebView - 1504010484
      • Bluetooth Low Energy - 1504010486
      • Building impressive Android media experiences - 1504010493
      • The next Generation of Authentication - 1504020497
      • Don't Alpha That Pixel! - 1504020523
      • NFC + HCE Your phone in an interactive world - 1504020509
      • Demystifying encodes and decodes of WebM - 1504020521
      • Google Cloud Messaging - 1504020524
      • Getting your Game on the Big Screen - 1504020518
      • I hear you like realtime memes - 1504020511
      • Offerize your App - 1504020506
      • Using the Android Job Scheduler - 1504020504
      • From Holo to Material - 1504020526
      • Under the Hood of Android Auto - 1504020501
      • Isolation for Android App Developers - 1504020498
      • Android Work - 1504010496
      • ExoPlayer: Adaptive video streaming on Android - 1504010489
      • Sample rates and resampling: Why can't we all just agree? - 1504010488
      • Drive Android API - 1504010485
    • Android Studio - 004
      • Layout Editor (Ep 3, Android Studio) - 1503290479
      • Introducing Gradle (Ep 2, Android Studio) - 1503170426
    • I/O 2014 Android 分发主题 - 091
      • Introduction to Google Play - 1504030534
      • Google Play: building your user community - 1504030535
      • Optimizing Apps for Education - 1504030536
      • Succeeding in Education Technology - 1504030530
      • Subscriptions Made Easy with Google Play - 1504030531
      • The world is your playground - go global with Google - 1504030533
      • Maximizing discoverability on Google Play - 1504030538
    • Android Auto - 003
      • Introduction to Android Auto - 1504130615
      • Android Auto Messaging - 1504130617
      • Android Auto Audio - 1504130616
    • Android Wear - 006
      • Designing for Android Wear - 1503210448
      • How We Customized Google Apps for Android Wear - 1503210450
      • Fullscreen apps for Android Wear - 1503210445
      • New Notification Features for Android Wear - 1503210446
      • Building Cloud-powered wearable Apps - 1503210449
      • An Introduction to Android Wear - 1503190435
      • Google I/O 2014 - Android Wear: The developer's perspective - 1503210442
      • Devoxx 2014 Interviews: Android Wear - 1503210440
      • DevBytes: Watch Faces for Android Wear - 1503210439
    • Android TV - 005
      • Using the Leanback library - 1504080588
      • Beach Buggy Racing Multiplayer with Nearby Connections (Play Services) - 1503060387
    • Android for Work - 106
      • Android for Work for Developers - 1503060390
      • App Configurations, Testing and Launchers - 1504110590
    • IO Bytes 2014 - Android - 066
      • Chrome Apps on Android and iOS - 1501080014
      • Perf Primer CPU, GPU and your Android game - 1501080017
  • Chrome 平台
    • IO Bytes 2014 - Chrome and Web - 067
      • Using the PageSpeed API - 1505070815
      • Fabulous Forms for the multi-device web - 1505070816
      • Testing multi-screen web pages - 1505070817
      • Responsive images today - 1505070819
      • Web Performance Testing at YouTube - 1505070828
      • Building sites for the multi-device web - 1505070820
      • Deep dive: Google Cloud Messaging for Chrome - 1505070827
  • Google 创业者资源
    • Coffee with a Googler - 012
      • Chat with Allen Huang of AndroidTV - 1503040384
      • Chat with Fred Chung about developer advocacy - 1503070395
      • Google Fit platform with Michelle Haq - 1503210443
      • Android Auto Product Manager Andrew Brenner - 1501120027
      • Chat with Francis Ma about Google Play services - 1501120028
    • Root Access For Startups - 077
      • What we learned building plug-ins for Android, with startup Magnet - 1503230453
      • How to use crowdfunding to your advantage, with startup Hale Devices - 1503280462
      • How to overcome customer objections when selling tech, with startup Guesswork - 1503280458
    • First Things First - 029
      • Getting started with Android: A crash-course in developing for Android - 1504120601
      • How to ask a question: conducting research for your startup - 1504120603
      • MVP Design Hacks: transform your hot idea into a validated prototype - 1504120602
      • Build something people want: Solving real problems - 1504120605
    • How I - 061
      • Use BigQuery to find my most valuable customers - 1504070573
      • Manage beta testing communities using Google Play - 1504070572
      • Use paper wireframing to build native prototypes - 1504070570
      • Used social media and $0 marketing to get 68 million users - 1504070568
      • Prep to fundraise with four questions - 1504070564
      • Validated my idea in 2 days (with no code) - 1504070562
      • Build open platforms on Android - 1504120596
      • Get cheap, automatic analytics for my business using BigQuery - 1504070571
      • Write press releases to get international media coverage - 1504070569
      • Test beta-product features using Google Apps - 1504070563
      • Use URL builder to measure ROI on social media - 1504070561
      • Use events to build DeadSocial's brand - 1504070557
      • Use BigQuery to visualize streaming data - 1503220452
      • Find, screen, and hire developers - 1503120406
      • Drive engagement with social challenges - 1504070558
  • 设计
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      • Paper and Ink: The Materials that Matter - 1505050793
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    • DevBytes: Google Cloud Platform - 021
      • Powering the next killer app with the Google Cloud Platform - 1504210672
      • Introduction to Google Cloud Endpoints - 1504210675
      • The Beauty of Scale with Google Cloud Platform - 1504210678
    • Google Cloud Platform - Big Data - 105
      • GDELT & BigQuery: Understand the world - 1502200379
    • Uncategorized - 999
      • Introducing Google Cloud Platform Resources - 1501190370
  • Google 应用开发
    • Launchpad Online - 072
      • The Setup: Creating new apps using Google APIs - 1503190428
      • Listing your files in Google Drive - 1503190429
      • Customizing Google Analytics for your startup - 1503290473
      • The Launchpad Online series - 1503190427
      • Getting started with Google Analytics - 1503290472
      • Accessing Google Maps from a spreadsheet?!? - 1502220381
      • Change the world in 10 lines of code - 1503080398
    • Google Play Services - 054
      • Google Play services 6.1 - 1503290481
      • Google Play Services 7.0 - 1503200437
      • Google Play Services 6.5 - 1501080015
    • 谷歌地图 iOS SDK - 053
      • Maps Live: New Features in the Google Maps Mobile APIs for Android and iOS - 1504300777
    • Google 移动搜索开发 - 055
      • Is your app in the Google index? - 1504120598
      • Get more engaged users with Google Search for Developers - 1503070397
    • DevBytes: Google Cast - 020
      • Google Cast SDK for Android - 1504180666
      • Media Router Framework - Part 1 - Media Router API - 1504180667
      • Overview for Google Cast Receivers - 1504180664
      • Google Cast SDK for iOS - 1504180663
    • Getting Started with the Google Maps SDK for iOS - 035
      • Getting started with the Google Maps SDK for iOS, Part 1 - 1504270757
    • IO Bytes 2014 - Wearables - 070
      • Voice Driven GDK Glassware - 1505280836
    • Route 85 - 078
      • Introducing Route 85 - 1501120022
      • Quick Tip: Don't Default that Switch! - 1501190371
      • OpenInChrome on iOS, Part 1 - 1501120023
      • OpenInChrome on iOS, Part 2 - 1501120024
      • OpenInChrome on iOS, Part 3 - 1501120025
      • OpenInChrome on iOS, Part 4 - 1501120026
    • DevBytes 2014 - 019
      • Web Components - Template - 1505040789
      • Wearable DataLayer API - 1505050792
      • Using srcset for responsive images - 1505050790
      • The picture element for art direction - 1505050791
    • Uncategorized - 999
      • Sun Surveyor brings augmented reality to photographers using Google Maps APIs - 1504200668
      • Snappy travels with the Roads API - 1503060392
      • Easy Maps Apps in Java and Python - 1501140030
  • Google 广告平台
  • Polymer
    • Polycasts - 076
      • The Awesome Power of Auto-Binding Templates -- Polycasts #08 - 1502220382
      • Content Switcheroo with Core-Pages -- Polycasts #09 - 1502200380
      • Core Iconset -- Polycasts #02 - 1505040788
  • Web 平台
    • HTTP 203 - 062
      • Gotchas - 1501140368
      • Font Rendering - 1501080016
    • Web Components - 081
      • DevBytes: Web Components - Overview - 1504250709
  • 宣传视频
    • Uncategorized - 999
      • Google Developers - 1501150369
      • I/O Extended 2014 - Join me - 1502220383
  • Google 各类开发者会议
    • 2014 Chrome 开发者高峰会议 - 009
      • Keynote - Chrome Dev Summit 2014 (Darin Fisher) - 1503120407
      • TLS All the Things! - Security with Performance(Chris Palmer) - 1503140412
      • Let’s build some apps with Polymer!(Rob Dodson) - 1503150415
      • Day One Closing Remarks(Sundar Pichai) - 1503150417
      • Chrome Leadership panel - 1503160422
      • Fundamentals of Mobile Web Development(Matt Gaunt) - 1503150416
    • 2015 游戏开发者大会中 - 039
      • FlatBuffers - 1504150640
      • Games for Google Cast - 1504150637
      • Top 10 Things Android Game Developers Should Know v 3.0 - 1504150643
      • Automate Publishing for Google Play APIs - 1504150639
      • 3 Game Design Mistakes You're Making - 1504150636
      • Android TV - 1504150638
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    • Devoxx 2014 Interviews - 024
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      • Arithmetic Compression (Ep 5, Compressor Head) Google - 1503070394
      • Introducing Compressor Head - 1502120372
      • Episode 1 (Variable Length Codes) - 1502120373
      • Episode 2 (The LZ77 Compression Family) - 1502120374
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  • 解说词中文版：

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  1. Android 平台
  2. I/O 2014 Android 开发专题 - 089

Demystifying encodes and decodes of WebM - 1504020521

PreviousNFC + HCE Your phone in an interactive world - 1504020509NextGoogle Cloud Messaging - 1504020524

Last updated 5 years ago

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视频发布时间

2014年6月25日

视频介绍

Tips, tricks and practices to encode a video into WebM using VPx codecs for delivery across the web and on Android.

视频推介语

暂无，待补充。

译者信息

翻译

润稿

终审

原始链接

中文字幕

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Alice

Martin

--

1504020521

解说词中文版：

在过去的几年中 我们看到网络上的媒体消耗

呈现令人难以置信的增长 但是网络带宽

并没有保持同样的增长步伐

我是Vignesh

我在这里要探讨一下如何通过利用

一种新的网页视频格式来解决这个问题

视频已经被认为占用了

全世界网络带宽峰值的一半

在某些地方 甚至占用了网络带宽峰值的2/3

WebM项目是一个开放工具和多媒体技术的集合

它的目的是解决网络中媒体带来的挑战

和开展针对多媒体技术的

开放的自由的沟通

WebM项目开发了两种视频编码 VP8 和 VP9

媒体容器 也就是WebM容器

和一种叫WebP的图片格式

这些技术一同驱动

你所喜爱的一些Google服务

比如YouTube和Hangouts

他们也在网络中被广泛使用

例如 NetFlex和Facebook使用WebP

我们在2013年的I/O会议上推出了下一代开放视频编码VP9

使用VP9编码的视频在压缩效率上

比其他的方式提高了50%

目前 Chrome FireFox Opera和Android

支持VP9视频播放

自从2013年的I/O会议以后 我们在速度

和压缩效率上对VP9进行了改进

这使得YouTube可以选择

VP9作为他们下一代的视频编码

如果你在2013I/O会议之后对VP9的更新感兴趣

请浏览我们的视频 VP9的更新

此外 如果你想更深入的

了解压缩性能实现的编码技术

我们强烈推荐你浏览

我们在2013 I/O会议VP9环节的视频

它叫做 新的开放式视频编码

在这个视频中 我会关注

如何用开源工具使编码VP9视频变得简单

然后继续讨论我们怎么播放这些视频

首先是简单的渐进编码

假设你想编码一个视频

然后希望它能在各种设备中播放

换句话说 你想做的只是

主机上有一个视频 以主机的URL作为源

通过视频标签来播放它

这里是实现方法

递进编码非常简单 它允许任何支持

VP9的播放器下载并播放文件

例如Chrome FireFox和Android

这是建立一个递进的VP9编码的方法

你需要做的只是绑定FFmpeg到

你的输入文件 并设定它使用VP9编码器

这是播放视频的方法

这很简单 不是吗

如果你有更简单的方法

欢迎你把想法发送到这个电子邮箱

好了 如果你想在网络上提供视频服务

你还可以采用

一些HTML5相关技术

HTML5技术使你可以给你的客户

提供非常流畅的体验

以往的技术是很难实现的

用来解决这个问题的工业标准叫做DASH

DASH表示HTTP上的动态自适应流

它让你根据客户端的约束

选择能够提供

最佳可视质量的流数据

实际上 这是

端适应播放

在google 我们使用DASH和HTML5技术实现自适应播放

比如 多媒体源扩展

在YouTube上提供很棒的流畅体验

例如 使用VP9和DASH

我们改善了流媒体视频的关键参数 重缓冲

VP9 DASH视频对重缓冲的改善

在成熟市场大概有25% 在新出现的市场能达到50%

我们从多媒体开发者那里听说

为VP9建立DASH清单是很有挑战的事情

我很高兴的宣布我们使用FFmpeg

以及一系列开源工具

可以简化编码过程

现在让我们来看看如何编码VP9 DASH视频

并产生清单文件

对VP9视频进行编码 使它与DASH兼容

与渐进编码非常相似

只需要进行一些小改动

对于DASH来说 视频和音频

被分开编码 并保存到不同的文件中

你还需要传递额外的DASH变量给FFmpeg

这样它会产生与DASH相兼容的WebM文件

现在你已经有了编码过的视频和音频文件

你可以使用WebM的DASH清单工具

来产生DASH清单文件

WebM DASH清单工具是WebM工具项目的一部分

你可以在页面上的网址

下载我们使用的工具 通过它建立DASH流

和清单文件

好了 现在让我们说说集成一个视频播放器

通过DASH 播放VP9视频

重申一下 VP9解码已经

支持Chrome FireFox Opera和Android

同时 这代表着超过10亿的设备和浏览器

可以播放VP9视频

尽管这里有两款播放器能使其简单一些

但是创建一个VP9的播放器播放自适应视频

还是有些难度的

这两款播放器能使自适应VP9播放在两个

最流行的平台上运行 Web和Android

首先是Android

YouTube开源播放器叫做

Exo播放器 它支持VP9的自适应播放

想知道更多关于在你的应用中使用Exo播放器

播放VP9 DASH视频 可以在YouTube上看关于Exo播放器的话题

对于Web 我们在dash.js中加入了对VP9 DASH的支持

dash.js是一个非常好的多功能媒体播放器

并完全建立在HTML5上

关于如何使用dash.js来播放自适应VP9视频

可以在页面的网址上找到更多信息

使用这些工具 VP9内容的编解码

变得容易多了

现在轮到你们讲述了不起的故事

或者开发下一个了不起视频播放器了

当然 我们随时可以提供帮助

在webm-discuss@webmproject.org上给我们留言

谢谢

Youtube
Youtube
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