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I assume Facebook has this requirement for usability reasons. They don’t want a user to receive a video through one of its many share features and then not be a

• mappu 5y ago
  You need baseline codecs for baseline visibility, sure. But the article is about selectively choosing which videos to encode with more advanced parameters, and there's no reason to hold back delivering your 1080p VP9 just because the 720p VP9 isn't ready yet - just serve something else.
  • aledalgrande 5y ago
    What if you were streaming 1080 VP9 and then your player decides to downgrade to 720 because your connection became slower? At that point the missing 720 would make you unable to watch the video.
    • yaur 5y ago
      In MPEG-DASH codec is specified at the representation level so with a compliant packager and a compliant player the player should be able to switch down to the "fast h.264" rendition that exists before they start trying to create VP9 renditions.
• aarongolliver 5y ago
  This is (was?) a big problem with google photos. If you upload a video and immediately share it with someone they'll just see a black screen. A few minutes later they might be able to watch a super-low res encoded version, and only much later does a HD version become available. I started waiting 10 minutes between generating a "share" link before sending it to my family because of all the confusion it was causing.