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本帖由 qksniper08 6, 2014 發佈。版塊名稱:版務

  1. qksniper

    qksniper 電玩咖站長

    05 1, 2014


    Changes To VODs On Twitch
    Aug 06 2014 · 262 comments · Engineering, Tech
    [UPDATE 10:50 AM PT]: We need to temporarily disable the YouTube Exporter so that we can resolve increased capacity issues. The fix will take a day and should be ready for use again tomorrow.

    Our goal at Twitch is straightforward: deliver the highest quality video. This includes the ability to watch video on demand (VOD) on all of our platforms, not just the website.

    In order to create a system that supports live and VOD across the globe and on multiple platforms, we need to make significant changes to the way we’re currently storing video. Today, we’d like to discuss what these changes are, why they’re necessary, and how they benefit the entire Twitch community now and in the future.

    VOD: Past Broadcasts and Highlights

    First, some language clarification. Twitch VODs include both past broadcasts and highlights. After you finish your live broadcast, the complete broadcast is saved in Past Broadcasts. Historically, we’ve offered you the option to save a past broadcast forever.

    Past broadcasts can also be edited into Highlights and watched on the website or exported to YouTube for promotional use. Currently, a highlight cannot exist without saving the entire broadcast as well.

    Shortcomings in the Current System

    The current system has a few notable limitations:

    VODs are saved in FLV format, and platforms like mobile and console devices can’t playback that format.
    As past broadcasts are saved in 30-minute chunks across multiple media servers, a single server maintenance or failure could prevent proper service of an entire VOD.
    Extremely limited availability of transcodes on VODs.
    Due to current storage requirements, past broadcasts can only be saved for 3 days without an explicit “save forever.”
    We must save an entire past broadcast indefinitely if a highlight from it exists.
    Looking at Viewership Data

    We found that the vast majority of past broadcast views happen within the first two weeks after they’re created. On the days following, viewership reduces exponentially.

    Y axis represents % of total views for an average past broadcast.
    We also discovered that 80% of our storage capacity is filled with past broadcasts that are never watched. That’s multiple petabytes for video that no one has ever viewed.

    Highlights, on the other hand, have much more value and longevity. Over their lifetime, highlights get 9x as many views as past broadcasts.

    Here’s the New Deal

    This data, along with feedback we’ve heard from the Twitch community, made it obvious that our VOD system needs to be improved. Today, we start to move in that direction with an update to how we manage your VODs.

    This update is the first step in a process to build features that you’ve asked for:

    Better VOD quality of service for our international viewers.
    Ability to watch VODs on mobile and other platforms.
    Secure storage of your past broadcasts (with triple redundancy, we make three copies of your past broadcasts).
    An easier way to export highlights of any length to YouTube.
    A step toward conceptualizing new features like DVR, matching quality options from live to VOD, and better VOD discovery.
    Going forward, we’re increasing default rolling storage for past broadcasts from 3 days to a maximum of 14 days, for everyone who has opted in (i.e., enabled Archive Broadcasts). For Turbo subscribers and members of the Twitch Partner Program, that storage is increased to a maximum of 60 days.

    Unfortunately, increasing the amount of storage this way comes at considerable cost. In order to enable this, we have to remove the “save forever” option entirely for past broadcasts. Given the viewership patterns on past broadcasts, we believe the tradeoff is better for everyone. To be clear: this is not a move to economize on space. Due to the triple redundancy, it will actually require us to substantially increase our total amount of storage.

    Highlights will be saved indefinitely; however, they will now be limited to 2 hours in length. All prior highlights that you’ve made will be saved regardless of length.
    #1 qksniper, 08 6, 2014
    Last edited by a moderator: 08 6, 2014
  2. greed760923

    greed760923 ★ Level 2: One Hit Wonder

    08 1, 2014
  3. NoYoC

    NoYoC ★ Level 7: Champion

    06 13, 2014

    若是成為Freedom! Partner的話